Search for long-lived charginos based on a disappearing-track signature in pp collisions at $$ \sqrt{s}=13 $$ TeV with the ATLAS detector
M. AaboudFaculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, MoroccoG. AadCPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, FranceB. AbbottHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, United States of AmericaO. AbdinovInstitute of Physics, Azerbaijan Academy of Sciences, Baku, AzerbaijanB. AbeloosLAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, FranceHaider AbidiDepartment of Physics, University of Toronto, Toronto, ON, CanadaO. S. AbouZeidSanta Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, United States of AmericaN. L. AbrahamDepartment of Physics and Astronomy, University of Sussex, Brighton, United KingdomH. AbramowiczRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelH. AbreuDepartment of Physics, Technion: Israel Institute of Technology, Haifa, IsraelR. AbreuCenter for High Energy Physics, University of Oregon, Eugene, OR, United States of AmericaY. AbulaitiDepartment of Physics, Stockholm University, Stockholm, SwedenB. S. AcharyaINFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, ItalyS. AdachiInternational Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, JapanL. AdamczykAGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, PolandJahred AdelmanDepartment of Physics, Northern Illinois University, DeKalb, IL, United States of AmericaM. AdersbergerFakultät für Physik, Ludwig-Maximilians-Universität München, München, GermanyTim AdyeParticle Physics Department, Rutherford Appleton Laboratory, Didcot, United KingdomTony AffolderSanta Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, United States of AmericaT. Agatonović-JovinInstitute of Physics, University of Belgrade, Belgrade, SerbiaC. AgheorghieseiDepartment of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, RomaniaJ. A. Aguilar–SaavedraLaboratório de Instrumentação e Física Experimental de Partículas - LIP, Lisboa, PortugalS. AhlenDepartment of Physics, Boston University, Boston, MA, United States of AmericaF. AhmadovInstitute of Physics, Azerbaijan Academy of Sciences, Baku, AzerbaijanGiulio AielliINFN Sezione di Roma Tor Vergata, Roma, ItalyS. AkatsukaFaculty of Science, Kyoto University, Kyoto, JapanH. AkerstedtDepartment of Physics, Stockholm University, Stockholm, SwedenTorsten AkessonFysiska institutionen, Lunds universitet, Lund, SwedenE. AkilliDepartement de Physique Nucleaire et Corpusculaire, Université de Genève, Geneva, SwitzerlandAndrei AkimovP.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, RussiaGian Luigi AlberghiINFN Sezione di Bologna, Bologna, ItalyJ. AlbertDepartment of Physics and Astronomy, University of Victoria, Victoria, BC, CanadaP. AlbicoccoINFN e Laboratori Nazionali di Frascati, Frascati, ItalyM. J. Alconada VerziniInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaSara AlderweireldtInstitute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, NetherlandsM. AleksaCERN, Geneva, SwitzerlandI. N. AleksandrovJoint Institute for Nuclear Research, JINR Dubna, Dubna, RussiaC. AlexaHoria Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, RomaniaG. AlexanderRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelT. AlexopoulosPhysics Department, National Technical University of Athens, Zografou, GreeceMuhammad AlhroobHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, United States of AmericaBabar AliII Physikalisches Institut, Georg-August-Universität, Göttingen, GermanyM. AlievINFN Sezione di Lecce, Lecce, ItalyGianluca AlimontiINFN Sezione di Milano, Milano, ItalyJ. AlisonEnrico Fermi Institute, University of Chicago, Chicago, IL, United States of AmericaS. P. AlkireNevis Laboratory, Columbia University, Irvington, NY, United States of AmericaB. M. M. AllbrookeDepartment of Physics and Astronomy, University of Sussex, Brighton, United KingdomB. W. AllenCenter for High Energy Physics, University of Oregon, Eugene, OR, United States of AmericaPhilip Patrick AllportSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomA. AloisioINFN Sezione di Napoli, Napoli, ItalyA. AlonsoNiels Bohr Institute, University of Copenhagen, Kobenhavn, DenmarkF. AlonsoInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaCristiano AlpigianiDepartment of Physics, University of Washington, Seattle, WA, United States of AmericaA. A. AlshehriSUPA - School of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomM. I. AlstatyCPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, FranceB. Álvarez GonzálezCERN, Geneva, SwitzerlandD. Álvarez PiquerasInstituto de Fisica Corpuscular (IFIC), Centro Mixto Universidad de Valencia - CSIC, Valencia, SpainM. G. AlviggiINFN Sezione di Napoli, Napoli, ItalyB. T. AmadioPhysics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, United States of AmericaY. Amaral CoutinhoUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, BrazilC. AmelungDepartment of Physics, Brandeis University, Waltham, MA, United States of AmericaDante AmideiDepartment of Physics, The University of Michigan, Ann Arbor, MI, United States of AmericaS. P. Amor Dos SantosLaboratório de Instrumentação e Física Experimental de Partículas - LIP, Lisboa, PortugalA. AmorimLaboratório de Instrumentação e Física Experimental de Partículas - LIP, Lisboa, PortugalS. AmorosoCERN, Geneva, SwitzerlandG. AmundsenDepartment of Physics, Brandeis University, Waltham, MA, United States of AmericaChristos AnastopoulosDepartment of Physics and Astronomy, University of Sheffield, Sheffield, United KingdomL. S. AncuDepartement de Physique Nucleaire et Corpusculaire, Université de Genève, Geneva, SwitzerlandN. AndariSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomT. AndeenDepartment of Physics, The University of Texas at Austin, Austin, TX, United States of AmericaC. F. AndersPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJohn Kenneth AndersOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomK. J. AndersonEnrico Fermi Institute, University of Chicago, Chicago, IL, United States of AmericaA. AndreazzaINFN Sezione di Milano, Milano, ItalyV. AndreiKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyS. AngelidakisPhysics Department, National and Kapodistrian University of Athens, Athens, GreeceI. AngelozziNikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, NetherlandsAaron AngeramiNevis Laboratory, Columbia University, Irvington, NY, United States of AmericaAlexey AnisenkovBudker Institute of Nuclear Physics, SB RAS, Novosibirsk, RussiaN. AnjosInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Barcelona, SpainA. AnnoviINFN Sezione di Pisa, Pisa, ItalyC. AntelKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyM. AntonelliINFN e Laboratori Nazionali di Frascati, Frascati, ItalyA. AntonovNational Research Nuclear University MEPhI, Moscow, RussiaD. J. A. AntrimDepartment of Physics and Astronomy, University of California Irvine, Irvine, CA, United States of AmericaF. AnulliINFN Sezione di Roma, Roma, ItalyMasato AokiKEK, High Energy Accelerator Research Organization, Tsukuba, JapanL. Aperio BellaCERN, Geneva, SwitzerlandG. ArabidzeDepartment of Physics and Astronomy, Michigan State University, East Lansing, MI, United States of AmericaY. AraiKEK, High Energy Accelerator Research Organization, Tsukuba, JapanJ. P. AraqueLaboratório de Instrumentação e Física Experimental de Partículas - LIP, Lisboa, PortugalV. Araujo FerrazUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, BrazilA. T. H. ArceDepartment of Physics, Duke University, Durham, NC, United States of AmericaR. E. ArdellDepartment of Physics, Royal Holloway University of London, Surrey, United KingdomF. A. ArduhInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaJ-F. ArguinUniversité de MontréalS. ArgyropoulosUniversity of Iowa, Iowa City, IA, United States of AmericaM. ArıkDepartment of Physics, Bogazici University, Istanbul, TurkeyA. J. ArmbrusterCERN, Geneva, SwitzerlandL. J. ArmitageSchool of Physics and Astronomy, Queen Mary University of London, London, United Kingdom
2018en
ABI
Abstract
A bstract This paper presents a search for direct electroweak gaugino or gluino pair production with a chargino nearly mass-degenerate with a stable neutralino. It is based on an integrated luminosity of 36.1 fb −1 of pp collisions at $$ \sqrt{s}=13 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:math> TeV collected by the ATLAS experiment at the LHC. The final state of interest is a disappearing track accompanied by at least one jet with high transverse momentum from initial-state radiation or by four jets from the gluino decay chain. The use of short track segments reconstructed from the innermost tracking layers significantly improves the sensitivity to short chargino lifetimes. The results are found to be consistent with Standard Model predictions. Exclusion limits are set at 95% confidence level on the mass of charginos and gluinos for different chargino lifetimes. For a pure wino with a lifetime of about 0.2 ns, chargino masses up to 460 GeV are excluded. For the strong production channel, gluino masses up to 1.65 TeV are excluded assuming a chargino mass of 460 GeV and lifetime of 0.2 ns.
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Citations and references
Cited by 20 references