Are Raklev

INSPIREHEP

• Araz, Jack Y.; Buckley, Andy; Kasieczka, Gregor; Kieseler, Jan; Kraml, Sabine & Kvellestad, Anders [Vis alle 13 forfattere av denne artikkelen] (2024). Les Houches guide to reusable ML models in LHC analyses. SciPost Physics. 3. doi: 10.21468/SciPostPhysCommRep.3. Fulltekst i vitenarkiv Vis sammendrag

  With the increasing usage of machine-learning in high-energy physics analyses, the publication of the trained models in a reusable form has become a crucial question for analysis preservation and reuse. The complexity of these models creates practical issues for both reporting them accurately and for ensuring the stability of their behaviours in different environments and over extended timescales. In this note we discuss the current state of affairs, highlighting specific practical issues and focusing on the most promising technical and strategic approaches to ensure trustworthy analysis-preservation. This material originated from discussions in the LHC Reinterpretation Forum and the 2023 PhysTeV workshop at Les Houches.

• Ananiev, Viktor; Balázs, Csaba; Beniwal, Ankit; Braseth, Lasse Lorentz; Buckley, Andy & Butterworth, Jonathan [Vis alle 21 forfattere av denne artikkelen] (2023). Collider constraints on electroweakinos in the presence of a light gravitino. European Physical Journal C. ISSN 1434-6044. 83(6). doi: 10.1140/epjc/s10052-023-11574-z. Fulltekst i vitenarkiv Vis sammendrag

  Using the GAMBIT global fitting framework, we constrain the MSSM with an eV-scale gravitino as the lightest supersymmetric particle, and the six electroweakinos (neutralinos and charginos) as the only other light new states. We combine 15 ATLAS and 12 CMS searches at 13 TeV, along with a large collection of ATLAS and CMS measurements of Standard Model signatures. This model, which we refer to as the G~-EWMSSM, exhibits quite varied collider phenomenology due to its many permitted electroweakino production processes and decay modes. Characteristic G~-EWMSSM signal events have two or more Standard Model bosons and missing energy due to the escaping gravitinos. While much of the G~-EWMSSM parameter space is excluded, we find several viable parameter regions that predict phenomenologically rich scenarios with multiple neutralinos and charginos within the kinematic reach of the LHC during Run 3, or the High Luminosity LHC. In particular, we identify scenarios with Higgsino-dominated electroweakinos as light as 140 GeV that are consistent with our combined set of collider searches and measurements. The full set of G~-EWMSSM parameter samples and GAMBIT input files generated for this work is available via Zenodo.

• Abdussalam, Shehu S.; Agocs, Fruzsina J.; Allanach, Benjamin C.; Athron, Peter; Balázs, Csaba & Bagnaschi, Emanuele [Vis alle 75 forfattere av denne artikkelen] (2022). Simple and statistically sound recommendations for analysing physical theories. Reports on progress in physics (Print). ISSN 0034-4885. 85(5). doi: 10.1088/1361-6633/ac60ac. Fulltekst i vitenarkiv
• Athron, Peter; Kozar, Neal Avis; Balázs, Csaba; Beniwal, Ankit; Bloor, Sanjay & Bringmann, Torsten [Vis alle 26 forfattere av denne artikkelen] (2021). Thermal WIMPs and the scale of new physics: global fits of Dirac dark matter effective field theories. European Physical Journal C. ISSN 1434-6044. 81(11). doi: 10.1140/epjc/s10052-021-09712-6. Fulltekst i vitenarkiv Vis sammendrag

  Abstract We assess the status of a wide class of WIMP dark matter (DM) models in light of the latest experimental results using the global fitting framework . We perform a global analysis of effective field theory (EFT) operators describing the interactions between a gauge-singlet Dirac fermion and the Standard Model quarks, the gluons and the photon. In this bottom-up approach, we simultaneously vary the coefficients of 14 such operators up to dimension 7, along with the DM mass, the scale of new physics and several nuisance parameters. Our likelihood functions include the latest data from Planck , direct and indirect detection experiments, and the LHC. For DM masses below 100 GeV, we find that it is impossible to satisfy all constraints simultaneously while maintaining EFT validity at LHC energies. For new physics scales around 1 TeV, our results are influenced by several small excesses in the LHC data and depend on the prescription that we adopt to ensure EFT validity. Furthermore, we find large regions of viable parameter space where the EFT is valid and the relic density can be reproduced, implying that WIMPs can still account for the DM of the universe while being consistent with the latest data.

• Bloor, Sanjay; Gonzalo, Tomas Esteban; Scott, Pat; Chang, Christopher; Raklev, Are & Camargo-Molina, José Eliel [Vis alle 10 forfattere av denne artikkelen] (2021). The GAMBIT Universal Model Machine: from Lagrangians to likelihoods. European Physical Journal C. ISSN 1434-6044. 81(12). doi: 10.1140/epjc/s10052-021-09828-9. Fulltekst i vitenarkiv Vis sammendrag

  Abstract We introduce the Universal Model Machine (), a tool for automatically generating code for the global fitting software framework , based on Lagrangian-level inputs. accepts models written symbolically in and formats, and can use either tool along with and to generate model, collider, dark matter, decay and spectrum code, as well as interfaces to corresponding versions of , , and (C "Image missing"<!-- image only, no MathML or LaTex -->). In this paper we describe the features, methods, usage, pathways, assumptions and current limitations of . We also give a fully worked example, consisting of the addition of a Majorana fermion simplified dark matter model with a scalar mediator to via , and carry out a corresponding fit.

• Buckley, Andy; Kvellestad, Anders; Raklev, Are; Scott, Pat; Sparre, Jon Vegard & Abeele, Jeriek Paul Van den [Vis alle 7 forfattere av denne artikkelen] (2020). Xsec: the cross-section evaluation code. European Physical Journal C. ISSN 1434-6044. 80(12). doi: 10.1140/epjc/s10052-020-08635-y. Fulltekst i vitenarkiv Vis sammendrag

  The evaluation of higher-order cross-sections is an important component in the search for new physics, both at hadron colliders and elsewhere. For most new physics processes of interest, total cross-sections are known at next-to-leading order (NLO) in the strong coupling αs, and often beyond, via either higher-order terms at fixed powers of αs, or multi-emission resummation. However, the computation time for such higher-order cross-sections is prohibitively expensive, and precludes efficient evaluation in parameter-space scans beyond two dimensions. Here we describe the software tool xsec, which allows for fast evaluation of cross-sections based on the use of machine-learning regression, using distributed Gaussian processes trained on a pre-generated sample of parameter points. This first version of the code provides all NLO Minimal Supersymmetric Standard Model strong-production cross-sections at the LHC, for individual flavour final states, evaluated in a fraction of a second. Moreover, it calculates regression errors, as well as estimates of errors from higher-order contributions, from uncertainties in the parton distribution functions, and from the value of αs. While we focus on a specific phenomenological model of supersymmetry, the method readily generalises to any process where it is possible to generate a sufficient training sample.

• Abdallah, Waleed; AbdusSalam, Shehu S.; Ahmadov, Azar; Ahriche, Amine; Alguero, Gaël & Allanach, Ben [Vis alle 51 forfattere av denne artikkelen] (2020). Reinterpretation of LHC results for new physics: status and recommendations after run 2. SciPost Physics. 9(2), s. 1–45. doi: 10.21468/SciPostPhys.9.2.022. Fulltekst i vitenarkiv Vis sammendrag

  We report on the status of efforts to improve the reinterpretation of searches and measurements at the LHC in terms of models for new physics, in the context of the LHC Reinterpretation Forum. We detail current experimental offerings in direct searches for new particles, measurements, technical implementations and Open Data, and provide a set of recommendations for further improving the presentation of LHC results in order to better enable reinterpretation in the future. We also provide a brief description of existing software reinterpretation frameworks and recent global analyses of new physics that make use of the current data.

• Athron, Peter; Balázs, Csaba; Buckley, Andy; Cornell, Jonathan M.; Danninger, Mathias & Farmer, Ben [Vis alle 20 forfattere av denne artikkelen] (2019). Combined collider constraints on neutralinos and charginos. European Physical Journal C. ISSN 1434-6044. 79(5), s. 1–52. doi: 10.1140/epjc/s10052-019-6837-x. Fulltekst i vitenarkiv
• Athron, Peter; Balázs, Csaba; Bringmann, Torsten; Buckley, Andy; Chrząszcz, Martin & Conrad, Jan [Vis alle 31 forfattere av denne artikkelen] (2017). GAMBIT: The Global and Modular Beyond-the-Standard-Model Inference Tool. European Physical Journal C. ISSN 1434-6044. 77(11), s. 784–784. doi: 10.1140/epjc/s10052-017-5321-8. Fulltekst i vitenarkiv Vis sammendrag

  We describe the open-source global fitting package GAMBIT: the Global And Modular Beyond-the-Standard-Model Inference Tool. GAMBIT combines extensive calculations of observables and likelihoods in particle and astroparticle physics with a hierarchical model database, advanced tools for automatically building analyses of essentially any model, a flexible and powerful system for interfacing to external codes, a suite of different statistical methods and parameter scanning algorithms, and a host of other utilities designed to make scans faster, safer and more easily-extendible than in the past. Here we give a detailed description of the framework, its design and motivation, and the current models and other specific components presently implemented in GAMBIT. Accompanying papers deal with individual modules and present first GAMBIT results. GAMBIT can be downloaded from gambit.hepforge.org

• Balázs, Csaba; Buckley, Andy; Dal, Lars Andreas; Farmer, Ben; Jackson, Paul & Krislock, Abram Michael Beauregard [Vis alle 15 forfattere av denne artikkelen] (2017). ColliderBit: a GAMBIT module for the calculation of high-energy collider observables and likelihoods. European Physical Journal C. ISSN 1434-6044. 77(11), s. 795–795. doi: 10.1140/epjc/s10052-017-5285-8. Fulltekst i vitenarkiv Vis sammendrag

  We describe ColliderBit, a new code for the calculation of high energy collider observables in theories of physics beyond the Standard Model (BSM). ColliderBit features a generic interface to BSM models, a unique parallelised Monte Carlo event generation scheme suitable for large-scale supercomputer applications, and a number of LHC analyses, covering a reasonable range of the BSM signatures currently sought by ATLAS and CMS. ColliderBit also calculates likelihoods for Higgs sector observables, and LEP searches for BSM particles. These features are provided by a combination of new code unique to ColliderBit, and interfaces to existing state-of-the-art public codes. ColliderBit is both an important part of the GAMBIT framework for BSM inference, and a standalone tool for efficiently applying collider constraints to theories of new physics.

• Athron, Peter; Balázs, Csaba; Bringmann, Torsten; Buckley, Andy; Chrząszcz, Marcin & Conrad, Jan [Vis alle 26 forfattere av denne artikkelen] (2017). Status of the scalar singlet dark matter model. European Physical Journal C. ISSN 1434-6044. 77(8), s. 568–568. doi: 10.1140/epjc/s10052-017-5113-1. Fulltekst i vitenarkiv Vis sammendrag

  One of the simplest viable models for dark matter is an additional neutral scalar, stabilised by a Z2 symmetry. Using the GAMBIT package and combining results from four independent samplers, we present Bayesian and frequentist global fits of this model. We vary the singlet mass and coupling along with 13 nuisance parameters, including nuclear uncertainties relevant for direct detection, the local dark matter density, and selected quark masses and couplings. We include the dark matter relic density measured by Planck, direct searches with LUX, PandaX, SuperCDMS and XENON100, limits on invisible Higgs decays from the Large Hadron Collider, searches for high-energy neutrinos from dark matter annihilation in the Sun with IceCube, and searches for gamma rays from annihilation in dwarf galaxies with the Fermi-LAT. Viable solutions remain at couplings of order unity, for singlet masses between the Higgs mass and about 300 GeV, and at masses above ∼ 1 TeV. Only in the latter case can the scalar singlet constitute all of dark matter. Frequentist analysis shows that the low-mass resonance region, where the singlet is about half the mass of the Higgs, can also account for all of dark matter, and remains viable. However, Bayesian considerations show this region to be rather fine-tuned.

• Athron, Peter; Balázs, Csaba; Bringmann, Torsten; Buckley, Andy; Chrząszcz, Marcin & Conrad, Jan [Vis alle 24 forfattere av denne artikkelen] (2017). A global fit of the MSSM with GAMBIT. European Physical Journal C. ISSN 1434-6044. 77(12), s. 879–879. doi: 10.1140/epjc/s10052-017-5196-8. Fulltekst i vitenarkiv Vis sammendrag

  We study the seven-dimensional Minimal Supersymmetric Standard Model (MSSM7) with the new GAMBIT software framework, with all parameters defined at the weak scale. Our analysis significantly extends previous weak-scale, phenomenological MSSM fits, by adding more and newer experimental analyses, improving the accuracy and detail of theoretical predictions, including dominant uncertainties from the Standard Model, the Galactic dark matter halo and the quark content of the nucleon, and employing novel and highly-efficient statistical sampling methods to scan the parameter space. We find regions of the MSSM7 that exhibit co-annihilation of neutralinos with charginos, stops and sbottoms, as well as models that undergo resonant annihilation via both light and heavy Higgs funnels. We find high-likelihood models with light charginos, stops and sbottoms that have the potential to be within the future reach of the LHC. Large parts of our preferred parameter regions will also be accessible to the next generation of direct and indirect dark matter searches, making prospects for discovery in the near future rather good.

• Athron, Peter; Balázs, Csaba; Bringmann, Torsten; Buckley, Andy; Chrząszcz, Marcin & Conrad, Jan [Vis alle 25 forfattere av denne artikkelen] (2017). Global fits of GUT-scale SUSY models with GAMBIT. European Physical Journal C. ISSN 1434-6044. 77(12), s. 824–824. doi: 10.1140/epjc/s10052-017-5167-0. Fulltekst i vitenarkiv Vis sammendrag

  We present the most comprehensive global fits to date of three supersymmetric models motivated by grand unification: the constrained minimal supersymmetric standard model (CMSSM), and its Non-Universal Higgs Mass generalisations NUHM1 and NUHM2. We include likelihoods from a number of direct and indirect dark matter searches, a large collection of electroweak precision and flavour observables, direct searches for supersymmetry at LEP and Runs I and II of the LHC, and constraints from Higgs observables. Our analysis improves on existing results not only in terms of the number of included observables, but also in the level of detail with which we treat them, our sampling techniques for scanning the parameter space, and our treatment of nuisance parameters. We show that stau co-annihilation is now ruled out in the CMSSM at more than 95% confidence. Stop co-annihilation turns out to be one of the most promising mechanisms for achieving an appropriate relic density of dark matter in all three models, whilst avoiding all other constraints. We find high-likelihood regions of parameter space featuring light stops and charginos, making them potentially detectable in the near future at the LHC. We also show that tonne-scale direct detection will play a largely complementary role, probing large parts of the remaining viable parameter space, including essentially all models with multi-TeV neutralinos.

• Aramaki, T; Boggs, S; Bufalino, S; Dal, Lars Andreas; Doetinchem, Peter von & Donato, Flavio [Vis alle 27 forfattere av denne artikkelen] (2016). Review of the theoretical and experimental status of dark matter identification with cosmic-ray antideuterons. Physics reports. ISSN 0370-1573. 618, s. 1–37. doi: 10.1016/j.physrep.2016.01.002. Fulltekst i vitenarkiv
• Doetinchem, Peter von; Aramaki, T; Boggs, S; Bufalino, S; Dal, Lars Andreas & Donato, F [Vis alle 27 forfattere av denne artikkelen] (2015). Status of cosmic-ray antideuteron searches. Proceedings of Science (PoS). Fulltekst i vitenarkiv
• Allanach, Ben; Kvellestad, Anders & Raklev, Are (2015). Interpreting a CMS excess in lljj+ missing -transverse-momentum with the golden cascade of the minimal supersymmetric standard model. Physical Review D. ISSN 1550-7998. 91(11). doi: 10.1103/PhysRevD.91.115022. Fulltekst i vitenarkiv
• Dal, Lars Andreas & Raklev, Are (2015). Alternative formation model for antideuterons from dark matter. Physical Review D. ISSN 1550-7998. 91(12). doi: 10.1103/PhysRevD.91.123536. Fulltekst i vitenarkiv Vis sammendrag

  Antideuterons are a potential messenger for dark matter annihilation or decay in our own Galaxy, with very low backgrounds expected from astrophysical processes. The standard coalescence model of antideuteron formation, while simple to implement, is shown to be under considerable strain by recent data from the LHC. We suggest a new empirically based model, with only one free parameter, which is better able to cope with these data, and we explore the consequences of the model for dark matter searches. © 2015 American Physical Society

• Allanach, Ben; Raklev, Are & Kvellestad, Anders (2015). Consistency of the recent ATLAS Z+ETmiss excess in a simplified general gauge mediation model. Physical Review D. ISSN 1550-7998. 91(9). doi: 10.1103/PhysRevD.91.095016. Fulltekst i vitenarkiv
• Bomark, Nils-Erik; Kvellestad, Anders; Lola, Smaragda; Osland, Per & Raklev, Are (2014). R-parity violating chargino decays at the LHC. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2014(12). doi: 10.1007/JHEP12(2014)121. Fulltekst i vitenarkiv Vis sammendrag

  Supersymmetric models with R-parity violation (RPV) have become more popular following the lack of any excess of missing energy events at the 8 TeV LHC. To identify such models, the suggested searches generally rely on the decay products of the (effectively) lightest supersymmetric particle (LSP), with signals that depend on the identity of the LSP and the relevant RPV operators. Here we look at the prospects for detecting RPV chargino decays at the LHC and find substantial patches of parameter space in the Minimal Supersymmetric Standard Model with possibly spectacular signatures, such as three charged-lepton resonances.

• Dal, Lars Andreas & Raklev, Are (2014). Antideuteron limits on decaying dark matter with a tuned formation model. Physical Review D. ISSN 1550-7998. 89(10). doi: 10.1103/PhysRevD.89.103504. Fulltekst i vitenarkiv Vis sammendrag

  We investigate the production of antideuterons from decaying dark matter, using gravitinos in supersymmetric models with trilinear R-parity-violating (RPV) operators as an example. The model used for antideuteron formation is shown to induce large uncertainties in the predicted flux, comparable to uncertainties from cosmic-ray propagation models. We improve on the formation model by tuning hadronization and coalescence parameters in Monte Carlo simulations to better reproduce the hadron spectra relevant for antideuteron production. In light of current bounds on fluxes and future prospects from the AMS-02 and GAPS experiments we set limits on RPV couplings as a function of the gravitino mass. © 2014 American Physical Society

• Bomark, Nils-Erik; Kvellestad, Anders; Lola, Smaragda; Osland, Per & Raklev, Are (2014). Long lived charginos in Natural SUSY? Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2014(5:7). doi: 10.1007/JHEP05(2014)007. Fulltekst i vitenarkiv Vis sammendrag

  Supersymmetric models with a small chargino-neutralino mass difference, and as a result metastable charginos, have been a popular topic of investigation in collider phenomenology. The possibility of a chargino lighter than the lightest neutralino has also been raised. Recently, the absence of any supersymmetric signal in the 8TeV LHC data has led to significant interest in the so-called Natural SUSY models with light higgsinos. These models also have a naturally small chargino-neutralino mass difference. However, we show here that when relevant indirect constraints from results at the LHC and elsewhere are applied, this possibility is heavily constrained within the Minimal Supersymmetric Standard Model (MSSM): massive metastable higgsinos are not a signature of Natural SUSY.

• Bugge, Lars; Lipniacka, Anna; Ould-Saada, Farid; Read, Alexander Lincoln; Raklev, Are & Smestad, Lillian [Vis alle 7 forfattere av denne artikkelen] (2012). Er Higgsbosonet funnet ved LHC? Fra Fysikkens Verden. ISSN 0015-9247. Fulltekst i vitenarkiv
• Abdesselam, A.; Belyaev, A; Kuutmann, E. Bergeaas; Bitenc, U; Brooijmans, G & Butterworth, J [Vis alle 64 forfattere av denne artikkelen] (2011). Boosted objects: a probe of beyond the standard model physics. European Physical Journal C. ISSN 1434-6044. 71(6). doi: 10.1140/epjc/s10052-011-1661-y. Fulltekst i vitenarkiv
• Bomark, Nils-Erik; Lola, Smaragda; Osland, Per & Raklev, Are Reinert (2010). Photon, neutrino and charged particle spectra from R-violating gravitino decays. Physics Letters B. ISSN 0370-2693. 686(2-3), s. 152–161. doi: 10.1016/j.physletb.2010.02.050. Fulltekst i vitenarkiv Vis sammendrag

  We study photonic, neutrino and charged particle signatures from slow decays of gravitino dark matter in supersymmetric theories where R-parity is explicitly broken by trilinear operators. Photons and (anti-)fermions from loop and tree-level processes give rise to spectra with distinct features, which, if observed, can give crucial input on the possible mass of the gravitino and the magnitude and flavour structure of R-violating operators. Within this framework, we make detailed comparisons of the theoretical predictions to the recent experimental data from PAMELA, ATIC and Fermi LAT.

• Raklev, Are; Osland, Per; Bomark, Nils-Erik & Lola, Smaragda (2009). Cosmic Ray Signatures from Decaying Gravitino Dark Matter. Proceedings of Science (PoS). E, s. 98–98. doi: 10.22323/1.084.0098. Fulltekst i vitenarkiv Vis sammendrag

  We study the charged cosmic rays arising from the slow decay of gravitino dark matter within supersymmetric scenarios with trilinear R-parity violation. It is shown that operators of the LLE type can very well account for the recent anomalies in cosmic ray electron and positron data reported by PAMELA, ATIC and Fermi LAT, without violating any other bounds. This scenario will soon be tested by the Fermi LAT data on diffuse gamma ray emission.

• Bomark, Nils-Erik; Lola, Smaragda; Osland, Per & Raklev, Are Reinert (2009). Gravitino dark matter and the flavour structure of R-violating operators. Physics Letters B. ISSN 0370-2693. 677(1-2), s. 62–70. doi: 10.1016/j.physletb.2009.05.011. Fulltekst i vitenarkiv Vis sammendrag

  We study gravitino dark matter and slow gravitino decays within the framework of R-violating supersymmetry, with particular emphasis on the flavour dependence of the branching ratios and the allowed R-violating couplings. The dominant decay modes and final state products turn out to be very sensitive to the R-violating hierarchies. Mixing effects can be crucial in correctly deriving the relative magnitude of the various contributions, particularly for heavy flavours with phase space suppression. The study of the strength of different decay rates for the gravitino is also correlated to collider signatures expected from decays of the Next-to-Lightest Supersymmetric Particle (NLSP) and to single superparticle production.

• Lola, S; Osland, Per & Raklev, Are Reinert (2007). Radiative gravitino decays from R-parity violation. Physics Letters B. ISSN 0370-2693. 656(1-3), s. 83–90. doi: 10.1016/j.physletb.2007.09.048. Fulltekst i vitenarkiv
• Butterworth, Jonathan M.; Ellis, John R & Raklev, Are Reinert (2007). Reconstructing sparticle mass spectra using hadronic decays. Journal of High Energy Physics (JHEP). ISSN 1126-6708. doi: 10.1088/1126-6708/2007/05/033. Fulltekst i vitenarkiv
• Kraml, Sabine & Raklev, Are Reinert (2006). Same-sign top quarks as signature of light stops at the CERN LHC. Physical Review D. Particles and fields. ISSN 0556-2821. 73(7), s. 075002–075002. Fulltekst i vitenarkiv
• Ellis, John R; Raklev, Are Reinert & Øye, Ola Kristoffer (2006). Gravitino Dark Matter Scenarios with Massive Metastable Charged Sparticles at the LHC. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 0610(061). Fulltekst i vitenarkiv
• Miller, David John; Osland, Per & Raklev, Are Reinert (2006). Invariant mass distributions in cascade decays. Journal of High Energy Physics (JHEP). ISSN 1126-6708. doi: 10.1088/1126-6708/2006/03/034. Fulltekst i vitenarkiv

Se alle arbeider i NVA

• Kierulf, Anine; Engh, Sunniva; Raklev, Are; Carlsen, Karin Cecilie Lødrup & Bergh, Johannes (2026). Når forskning blir fienden: Hvorfor trenger vi kunnskap? Fulltekst i vitenarkiv
• Voje, Kjetil L. & Raklev, Are (2025). Kan KI lage en helt ny farge? - Abels tårn - NRK Radio. [Radio]. NRK. Fulltekst i vitenarkiv Vis sammendrag

  Sammen med et ekspertpanel gir Torkild Jemterud svar på alt du ikke visste du lurte på Dagens eksperter: Fysiker Are Raklev Biolog Kjetil Lysne Voje Send oss dine spørsmål ved å trykke på snakkebobla øverst i NRK-radioappen, eller send mail til abels@nrk.no

• Mørch, Hedda Hassel; Raklev, Are; Kvellestad, Anders & Melteig, Elina (2025). Kvantefysikken - 100 år og like rar. Fulltekst i vitenarkiv
• Mørch, Hedda Hassel; Raklev, Are & Kvellestad, Anders (2025). Abels tårn: Kvantehistorier. [Radio]. NRK P2. doi: https:/radio.nrk.no/podkast/abels_taarn/l_7de3c2ba-b3ca-4120-a3c2-bab3cad12070. Fulltekst i vitenarkiv
• Bjorå, Charlotte Sletten; Raklev, Are; Engebretsen, Solveig & Jemterud, Torkild (2025). Abels tårn. [Radio]. NRK P2. Fulltekst i vitenarkiv
• Sheldrake, Rupert; Risan, Lars; Solberg, Carl Tollef & Raklev, Are (2024). "Emergence" - The Abracadabra-Word of Science? Fulltekst i vitenarkiv Vis sammendrag

  In a letter to the Indian poet Rabindranath Tagore, Albert Einstein argued that free will was an illusion. Our lives are as given by natural laws as everything else in the universe. But many naturalistic philosophers disagree. They argue that phenomena like life, sentience and even free will actually did emerge in a universe that totally lacked these phenomena. Such developments are often referred to as "emergence" - the alleged fact that totally new qualities can appear in the universe: Life emerged from inanimate matter, consciousness emerged from unconscious matter, free will emerged from a universe completely determined by natural laws. This is maybe the default stand by many scientists and educated people today. In this session we will discuss if the concept of emergence helps us understand phenomena such as consciousness, life and freedom, perhaps even morality, or if it is more or less an empty concept that does more to explain away these phenomena than to explain them. Short introduction by Lars Risan. In the panel: Rupert Sheldrake is a british biologist, philosopher, and author of more than one hundred scientific articles and nine books, including The Science Delusion. He is best known for his theory of morphic resonance. From 2005 to 2010, he was the director of the Perrott-Warrick project for the study of unexplained abilities in animals and humans, funded by Trinity College, Cambridge. Lars Risan is an anthropologist at Historical Museum, and has previously worked at the Norwegian Institute for Urban and Regional Research. Risan has written on a variety of topics. His latest book "Ulvebarna: Omsorgens naturhistorie» (2022) deals with subjects like with freedom and morality in nature and how these qualities are central in evolution of life. Carl Tollef Solberg is a medical doctor, philosopher, and associate professor at the University of Oslo. Are Raklev is a professor of theoretical physics at the University of Oslo and a prominent science communicator. His research field is particle phenomenology, and as a communicator he covers many areas within physics. Moderator: Johanne Pontoppidan Tuxen, journalist in the Danish newspaper Information with a focus on science journalism. She has also been a freelance journalist for Politiken for many years. She is the author of the book "Naturvidenskaben genfortalt" (2021).

• Tranberg, Anders; Kvellestad, Anders & Raklev, Are (2024). Wonderful World: Partikkelfysikk Q&A. Fulltekst i vitenarkiv
• Read, Alexander Lincoln; Raklev, Are & Rye, Eli Bæverfjord (2024). Utfordres standardmodellen av «det opprørske myonet»? Fulltekst i vitenarkiv Vis sammendrag

  Eksperimentet «Muon g-2» ved Fermilab i USA har holdt på i flere år. Her studerer man myonet, en elementærpartikkel som er en slags tyngre utgave av elektronet. Og det man finner er at disse myonene ikke oppfører seg helt som forventet. Forsøkene viser nemlig at myonene har et ørlite avvik i magnetisk dipolmoment i forhold til hva teorien i standardmodellen forutsier. Resultatene fra eksperimentene avviker så mye at forskjellen sannsynligvis ikke er tilfeldig, det trengs ny fysikk for å forklare den. Dette kan få konsekvenser for hele standardmodellen. Lurer du på om dette får noen konsekvenser for fysikken du underviser? Vi har invitert Alexander Read, Are Raklev og Eli Bæverfjord Rye, alle fra Fysisk Institutt på UiO, til å presentere og diskutere resultater og implikasjoner av nevnte eksperimenter.

• Tranberg, Anders; Raklev, Are & Kvellestad, Anders (2023). Q&A - Kvantemekanikken – mystisk og sann! Fulltekst i vitenarkiv
• Jakobsen, Hanne Østli; Read, Alexander Lincoln; Raklev, Are; Moldfjell, Stine & Huigen, Micha (2023). Ser vi første glimt av helt ny fysikk? [Journal]. Morgenbladet. Fulltekst i vitenarkiv Vis sammendrag

  Elementærpartikkelen myonet oppfører seg bittelitt merkelig. Det kan velte om på universets lover.

• Melteig, Elina; Raklev, Are & Read, Alexander Lincoln (2023). Går verden under neste torsdag? [Internet]. forskning.no. Fulltekst i vitenarkiv Vis sammendrag

  For om lag ti år siden oppdaget forskere at grunnleggende egenskaper ved universet er ustabile. Fremdeles vet de lite om hvorfor.

• Storehaug, Ida Torkjellsdatter; Kvellestad, Anders & Raklev, Are (2023). Tolkningsporblemet i kvantemekanikk. Fulltekst i vitenarkiv Vis sammendrag

  Hva er en kvantetilstand? Hva betyr «kollaps av bølgefunksjonen»? Hva vil det si å «måle» en kvantetilstand? Det har gått hundre år siden kvantemekanikkens gjennombrudd, men vi har fremdeles like mange spørsmål som svar. I denne episoden bruker vi spillefilmen «Thomas mot Thomas» som en inngang til å diskutere de grunnleggende spørsmålene i kvantemekanikken. Du får høre to kjemper strides om hvordan kvantemekanikken bør tolkes: Are Raklev (som forsvarer Mange-verden-teorien) og Anders Kvellestad (som er en forkjemper for kvante-baysianisme (Qbism)). Episoden er spilt inn med publikum i Store Fysisk Auditorium i Fysikkbygningen på Blindern.

• Einevoll, Gaute; Tindberg, Svein; Bang-Hansen, Kjetil; Raklev, Are & Kvellestad, Anders (2021). Podcast #49: Om det er mulig å tro på Gud og vitenskap samtidig. [Internet]. Podcast: Vett og vitenskap med Gaute Einevoll. Fulltekst i vitenarkiv
• Einevoll, Gaute & Raklev, Are (2021). Podcast #42: Om nye fysikkpartikler. [Internet]. Podcast: Vett og vitenskap med Gaute Einevoll. Fulltekst i vitenarkiv
• Engebretsen, Solveig; Raklev, Are; Gravensteen, Ida Kathrine & Jemterud, Torkild (2021). Abels tårn. [Radio]. NRK. Fulltekst i vitenarkiv
• Einevoll, Gaute & Raklev, Are (2020). Om partikkelfysikk og jakten på Higgs-bosonet. [Internet]. Podcast: Vett og vitenskap med Gaute Einevoll. Fulltekst i vitenarkiv
• Bøckman, Petter; Vestre, Katharina & Raklev, Are (2020). Abels tårn. [Radio]. Abels tårn, EKKO, NRK P2. Fulltekst i vitenarkiv
• Jemterud, Torkild; Bjorå, Charlotte Sletten; Sand, Maria & Raklev, Are (2019). Abels tårn, kan planter bli deprimerte og lei seg? Hva ville skjedd om jorda var hul? [TV]. NRK 2. Fulltekst i vitenarkiv
• Andersen, Elise Rønnevig; Bratberg, Øivind; Hellum, Mari Kjos; Hjelle, Ole Petter; Hussein, Bassam & Lie, Anne Helene Kveim [Vis alle 11 forfattere av denne artikkelen] (2017). Landets beste forelesere svarer: Slik studerer du mest effektivt. [Journal]. Aftenposten. Fulltekst i vitenarkiv
• Sætra, Marte Julie; Raklev, Are; Hrubos-Strøm, Harald & Jemterud, Torkild (2017). Abels Tårn. [Radio]. Ekko - NRK. Fulltekst i vitenarkiv
• Svihus, Birger; Gadmar, Tone Charlotte; Raklev, Are & Jemterud, Torkild (2017). Abels Tårn. [Radio]. Ekko, NRK P2. Fulltekst i vitenarkiv
• Lipniacka, Anna; Olaussen, Kåre; Raklev, Are & Øverbø, Ingjald (2013). Per Osland 70 år. Fra Fysikkens Verden. ISSN 0015-9247. 75(2), s. 34–35. Fulltekst i vitenarkiv
• Raklev, Are (2013). Universet som forsvant: Om jakten på mørk materie. Fulltekst i vitenarkiv
• Raklev, Are; Read, Alexander Lincoln & Ould-Saada, Farid (2013). Nobelprisen i fysikk 2013. Fra Fysikkens Verden. ISSN 0015-9247. s. 101–104. Fulltekst i vitenarkiv
• Raklev, Are (2013). The Higgs mechanism & SUSY. Fulltekst i vitenarkiv
• Read, Alexander Lincoln; Ould-Saada, Farid; Smestad, Lillian & Raklev, Are (2012). Oppdagelsen av en ny partikkel. Fulltekst i vitenarkiv Vis sammendrag

  Denne ukens dramatiske resultater viser at Higgsbosonet kan bli et fyrlys inn i det ukjente.

• Smestad, Lillian & Raklev, Are (2012). Intervju om Higgsbosonet i RadioNovas program Vitenselskapet. Fulltekst i vitenarkiv
• Raklev, Are (2010). Masseproblemer? Fulltekst i vitenarkiv
• Raklev, Are Reinert (2007). Massive metastable charged particles at the LHC. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2007). Sparticle masses from hadronic decays. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2007). Reconstructing sparticle mass spectra using hadronic decays. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2007). Reconstructing sparticle mass spectra using hadronic decays. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2007). The unexpected expected - gravitino dark matter and R-parity violation. Fulltekst i vitenarkiv
• Gjelsten, Borge kile; Miller, David john; Osland, Per & Raklev, Are Reinert (2006). Mass Determination in Cascade Decays Using Shape Formulas. Fulltekst i vitenarkiv
• Gjelsten, Borge kile; Osland, Per; Raklev, Are Reinert & Miller, David john (2006). Mass ambiguities in cascade decays. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2006). Overview of SUSY phenomenology at the LHC. Fulltekst i vitenarkiv
• Kraml, Sabine & Raklev, Are Reinert (2006). Same-sign top quarks as signature of light stops. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2006). GDM scenarios with stau NLSP at the LHC. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2006). Light stops at the LHC. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2006). Search for Charged Metastable SUSY Particles at the LHC. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2006). GDM scenarios with massive metastable charged sparticles at the LHC. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2006). Massive metastable charged particles at the LHC. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2006). Search for a light stop. Fulltekst i vitenarkiv
• Raklev, Are Reinert & Kraml, Sabine (2005). Light stops. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2005). Kinematics of cascade decays. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2005). Kinematics of cascade decays. Fulltekst i vitenarkiv Vis sammendrag

  In New Physics (NP) models with realistic Dark Matter candidates, the appearance of decay chains with NP particles are expected. This talk will discuss the derivation of analytic expressions for the invariant mass distributions of the standard model endproducts of these decays, and the use of these to accurately measure NP masses at the LHC.

• Kraml, Sabine & Raklev, Are Reinert (2005). Same-sign tops as signature of light stops at the LHC. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2005). En kort historie om kosmologi. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2004). Searching for multiple invariant mass edges at the LHC. Fulltekst i vitenarkiv
• Raklev, Are Reinert (2004). WMAP constraints and mSUGRA benchmark points for the LHC. Fulltekst i vitenarkiv
• Kvellestad, Anders; Raklev, Are & Read, Alexander Lincoln (2015). Chasing SUSY Through Parameter Space. Universitetet i Oslo. Fulltekst i vitenarkiv Vis sammendrag

  In this thesis we explore several physics scenarios based on the Minimal Supersymmetric Standard Model (MSSM) and its extension in terms of Rparity violation. We derive predictions for, and analyse results from, the ongoing experiments at the Large Hadron Collider (LHC). The important role played by statistics and parameter scanning techniques in analysis of large parameter spaces is emphasized. We investigate a class of models where the superpartners of the Higgs and electroweak bosons, the charginos and neutralinos, are nearly degenerate in mass. When R-parity is conserved, this degeneracy can potentially make the lightest chargino long-lived on the timescales of collider physics. However, through a Bayesian analysis of the relevant parameter space, we find that this possibility is disfavoured by current data. In models where R-parity violating interactions are included, supersymmetric particles can decay to final states involving only Standard Model particles. We demonstrate that a small chargino–neutralino mass difference in this case may lead to interesting signals in LHC searches, including resonances of three charged particles. Although the first run of the LHC produced no clear sign of physics beyond the Standard Model, some small, yet intriguing, excesses have been observed in the data. We investigate whether two excesses seen by the CMS and ATLAS experiments in searches for dileptons, jets and missing energy can be interpreted as early hints of supersymmetry. After taking into account the null-results of other LHC searches, we find that the supersymmetric scenarios considered are not viable explanations of the observed excesses.

• Raklev, Are Reinert & Osland, Per (2007). Supersymmetric Cascade Decays at the LHC. Universitetet i Bergen. ISSN 9788230803899. Fulltekst i vitenarkiv
• Miller, David john; Osland, Per & Raklev, Are Reinert (2005). Invariant mass distributions in cascade decays. CERN. Fulltekst i vitenarkiv

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