Search for metastable heavy charged particles with large ionization energy loss in p p collisions at s = 13     TeV using the ATLAS experiment

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dc.contributor.authorAaboud, M
dc.contributor.authorAad, G
dc.contributor.authorAbbott, B
dc.contributor.authorAbdallah, J
dc.contributor.authorAbdinov, O
dc.contributor.authorAbeloos, B
dc.contributor.authorAben, R
dc.contributor.authorAbouZeid, O S
dc.contributor.authorAbraham, N L
dc.contributor.authorAbramowicz, H
dc.contributor.authorAbreu, H
dc.contributor.authorAbreu, R
dc.contributor.authorAbulaiti, Y
dc.contributor.authorAcharya, B S
dc.contributor.authorAdamczyk, L
dc.contributor.authorAdams, D L
dc.contributor.authorAdelman, J
dc.contributor.authorAdomeit, S
dc.contributor.authorAdye, T
dc.contributor.authorAffolder, A A
dc.contributor.authorAgatonovic-Jovin, T
dc.contributor.authorAgricola, J
dc.contributor.authorAguilar-Saavedra, J A
dc.contributor.authorAhlen, S P
dc.contributor.authorAhmadov, F
dc.contributor.authorAielli, G
dc.contributor.authorAkerstedt, H
dc.contributor.authorÅkesson, T P A
dc.contributor.authorAkimov, A V
dc.contributor.authorAlberghi, G L
dc.contributor.authorAlbert, J
dc.contributor.authorAlbrand, S
dc.date.accessioned2021-10-08T07:11:34Z
dc.date.available2021-10-08T07:11:34Z
dc.date.issued2016
dc.description.abstractThis paper presents a search for massive charged long-lived particles produced in pp collisions at [sqrt]s=13 TeV at the LHC using the ATLAS experiment. The data set used corresponds to an integrated luminosity of 3.2 fb-2. Many extensions of the Standard Model predict the existence of massive charged long-lived particles, such as R-hadrons. These massive particles are expected to be produced with a velocity significantly below the speed of light, and therefore to have a specific ionization higher than any Standard Model particle of unit charge at high momenta. The Pixel subsystem of the ATLAS detector is used to measure the ionization energy loss of reconstructed charged particles and to search for such highly ionizing particles. The search presented here has much greater sensitivity than a similar search performed using the ATLAS detector in the [sqrt]s=8 TeV data set, thanks to the increase in expected signal cross section due to the higher center-of-mass energy of collisions, to an upgraded detector with a new silicon layer close to the interaction point, and to analysis improvements. No significant deviation from Standard Model background expectations is observed, and lifetime-dependent upper limits on R-hadron production cross sections and masses are set. Gluino R-hadrons with lifetimes above 0.4 ns and decaying to qq plus a 100 GeV neutralino are excluded at the 95% confidence level, with lower mass limit ranging between 740 and 1590 GeV. In the case of stable R-hadrons the lower mass limit at the 95% confidence level is 1570 GeV.
dc.identifier.apacitationAaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., ... Albrand, S. (2016). Search for metastable heavy charged particles with large ionization energy loss in p p collisions at s = 13     TeV using the ATLAS experiment. <i>Physical Review D - Particles, Fields, Gravitation, and Cosmology</i>, 93(11), 174 - 177. http://hdl.handle.net/11427/34643en_ZA
dc.identifier.chicagocitationAaboud, M, G Aad, B Abbott, J Abdallah, O Abdinov, B Abeloos, R Aben, et al "Search for metastable heavy charged particles with large ionization energy loss in p p collisions at s = 13     TeV using the ATLAS experiment." <i>Physical Review D - Particles, Fields, Gravitation, and Cosmology</i> 93, 11. (2016): 174 - 177. http://hdl.handle.net/11427/34643en_ZA
dc.identifier.citationAaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., Aben, R. & et al. 2016. Search for metastable heavy charged particles with large ionization energy loss in p p collisions at s = 13     TeV using the ATLAS experiment. <i>Physical Review D - Particles, Fields, Gravitation, and Cosmology.</i> 93(11):174 - 177. http://hdl.handle.net/11427/34643en_ZA
dc.identifier.issn1550-2368
dc.identifier.issn1550-7998
dc.identifier.ris TY - Journal Article AU - Aaboud, M AU - Aad, G AU - Abbott, B AU - Abdallah, J AU - Abdinov, O AU - Abeloos, B AU - Aben, R AU - AbouZeid, O S AU - Abraham, N L AU - Abramowicz, H AU - Abreu, H AU - Abreu, R AU - Abulaiti, Y AU - Acharya, B S AU - Adamczyk, L AU - Adams, D L AU - Adelman, J AU - Adomeit, S AU - Adye, T AU - Affolder, A A AU - Agatonovic-Jovin, T AU - Agricola, J AU - Aguilar-Saavedra, J A AU - Ahlen, S P AU - Ahmadov, F AU - Aielli, G AU - Akerstedt, H AU - Åkesson, T P A AU - Akimov, A V AU - Alberghi, G L AU - Albert, J AU - Albrand, S AB - This paper presents a search for massive charged long-lived particles produced in pp collisions at [sqrt]s=13 TeV at the LHC using the ATLAS experiment. The data set used corresponds to an integrated luminosity of 3.2 fb-2. Many extensions of the Standard Model predict the existence of massive charged long-lived particles, such as R-hadrons. These massive particles are expected to be produced with a velocity significantly below the speed of light, and therefore to have a specific ionization higher than any Standard Model particle of unit charge at high momenta. The Pixel subsystem of the ATLAS detector is used to measure the ionization energy loss of reconstructed charged particles and to search for such highly ionizing particles. The search presented here has much greater sensitivity than a similar search performed using the ATLAS detector in the [sqrt]s=8 TeV data set, thanks to the increase in expected signal cross section due to the higher center-of-mass energy of collisions, to an upgraded detector with a new silicon layer close to the interaction point, and to analysis improvements. No significant deviation from Standard Model background expectations is observed, and lifetime-dependent upper limits on R-hadron production cross sections and masses are set. Gluino R-hadrons with lifetimes above 0.4 ns and decaying to qq plus a 100 GeV neutralino are excluded at the 95% confidence level, with lower mass limit ranging between 740 and 1590 GeV. In the case of stable R-hadrons the lower mass limit at the 95% confidence level is 1570 GeV. DA - 2016 DB - OpenUCT DP - University of Cape Town IS - 11 J1 - Physical Review D - Particles, Fields, Gravitation, and Cosmology LK - https://open.uct.ac.za PY - 2016 SM - 1550-2368 SM - 1550-7998 T1 - Search for metastable heavy charged particles with large ionization energy loss in p p collisions at s = 13     TeV using the ATLAS experiment TI - Search for metastable heavy charged particles with large ionization energy loss in p p collisions at s = 13     TeV using the ATLAS experiment UR - http://hdl.handle.net/11427/34643 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34643
dc.identifier.vancouvercitationAaboud M, Aad G, Abbott B, Abdallah J, Abdinov O, Abeloos B, et al. Search for metastable heavy charged particles with large ionization energy loss in p p collisions at s = 13     TeV using the ATLAS experiment. Physical Review D - Particles, Fields, Gravitation, and Cosmology. 2016;93(11):174 - 177. http://hdl.handle.net/11427/34643.en_ZA
dc.publisher.departmentDepartment of Physics
dc.publisher.facultyFaculty of Science
dc.sourcePhysical Review D - Particles, Fields, Gravitation, and Cosmology
dc.source.journalissue11
dc.source.journalvolume93
dc.source.pagination174 - 177
dc.source.urihttps://dx.doi.org/10.1103/PhysRevD.93.112015
dc.subject.otherScience &
dc.subject.otherTechnology
dc.subject.otherPhysical Sciences
dc.subject.otherAstronomy &
dc.subject.otherAstrophysics
dc.subject.otherPhysics
dc.subject.otherParticles &
dc.subject.otherFields
dc.subject.otherSUPERSYMMETRY BREAKING
dc.subject.otherSPLIT SUPERSYMMETRY
dc.subject.otherDISTRIBUTIONS
dc.subject.otherCOLLIDERS
dc.subject.otherDETECTOR
dc.subject.otherSQUARK
dc.subject.otherLHC
dc.titleSearch for metastable heavy charged particles with large ionization energy loss in p p collisions at s = 13     TeV using the ATLAS experiment
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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