TY - JOUR
T1 - Search for long-lived particles in final states with displaced dimuon vertices in pp collisions at s =13 TeV with the ATLAS detector
AU - The ATLAS collaboration
AU - Aaboud, M.
AU - Aad, G.
AU - Abbott, B.
AU - Abdinov, O.
AU - Abeloos, B.
AU - Abhayasinghe, D. K.
AU - Abidi, S. H.
AU - Abouzeid, O. S.
AU - Abraham, N. L.
AU - Abramowicz, H.
AU - Abreu, H.
AU - Abulaiti, Y.
AU - Acharya, B. S.
AU - Adachi, S.
AU - Adamczyk, L.
AU - Adelman, J.
AU - Adersberger, M.
AU - Adiguzel, A.
AU - Adye, T.
AU - Affolder, A. A.
AU - Afik, Y.
AU - Agheorghiesei, C.
AU - Aguilar-Saavedra, J. A.
AU - Ahmadov, F.
AU - Aielli, G.
AU - Akatsuka, S.
AU - Åkesson, T. P.A.
AU - Akilli, E.
AU - Akimov, A. V.
AU - Alberghi, G. L.
AU - Albert, J.
AU - Albicocco, P.
AU - Alconada Verzini, M. J.
AU - Alderweireldt, S.
AU - Aleksa, M.
AU - Aleksandrov, I. N.
AU - Alexa, C.
AU - Alexopoulos, T.
AU - Alhroob, M.
AU - Ali, B.
AU - Alimonti, G.
AU - Anisenkov, A. V.
AU - Kazanin, V. F.
AU - Kharlamov, A. G.
AU - Kharlamova, T.
AU - Maximov, D. A.
AU - Podberezko, P.
AU - Rezanova, O. L.
AU - Soukharev, A. M.
AU - Zhulanov, V.
AU - Балдин, Евгений Михайлович
AU - Бобровников, Виктор Сергеевич
AU - Богданчиков, Георгий Александрович
AU - Бузыкаев, Алексей Рафаилович
AU - Масленников, Алексей Леонидович
AU - Пелеганчук, Сергей Владимирович
AU - Талышев, Алексей Александрович
AU - Тихонов, Юрий Анатольевич
PY - 2019/1/3
Y1 - 2019/1/3
N2 - A search is performed for a long-lived particle decaying into a final state that includes a pair of muons of opposite-sign electric charge, using proton-proton collision data collected at s=13 TeV by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 32.9 fb-1. No significant excess over the Standard Model expectation is observed. Limits at 95% confidence level on the lifetime of the long-lived particle are presented in models of new phenomena including gauge-mediated supersymmetry or decay of the Higgs boson, H, to a pair of dark photons, ZD. Lifetimes in the range cτ=1-2400 cm are excluded, depending on the parameters of the model. In the supersymmetric model, the lightest neutralino is the next-to-lightest supersymmetric particle, with a relatively long lifetime due to its weak coupling to the gravitino, the lightest supersymmetric particle. The lifetime limits are determined for very light gravitino mass and various assumptions for the neutralino mass in the range 300-1000 GeV. In the dark photon model, the lifetime limits are interpreted as exclusion contours in the plane of the coupling between the ZD and the Standard Model Z boson versus the ZD mass (in the range 20-60 GeV), for various assumptions for the H→ZDZD branching fraction.
AB - A search is performed for a long-lived particle decaying into a final state that includes a pair of muons of opposite-sign electric charge, using proton-proton collision data collected at s=13 TeV by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 32.9 fb-1. No significant excess over the Standard Model expectation is observed. Limits at 95% confidence level on the lifetime of the long-lived particle are presented in models of new phenomena including gauge-mediated supersymmetry or decay of the Higgs boson, H, to a pair of dark photons, ZD. Lifetimes in the range cτ=1-2400 cm are excluded, depending on the parameters of the model. In the supersymmetric model, the lightest neutralino is the next-to-lightest supersymmetric particle, with a relatively long lifetime due to its weak coupling to the gravitino, the lightest supersymmetric particle. The lifetime limits are determined for very light gravitino mass and various assumptions for the neutralino mass in the range 300-1000 GeV. In the dark photon model, the lifetime limits are interpreted as exclusion contours in the plane of the coupling between the ZD and the Standard Model Z boson versus the ZD mass (in the range 20-60 GeV), for various assumptions for the H→ZDZD branching fraction.
KW - PROTON-PROTON COLLISIONS
KW - PARTON DISTRIBUTIONS
KW - GLUINO PRODUCTION
KW - HEAVY-PARTICLES
KW - ENERGY
KW - SQUARK
KW - EXTENSION
KW - DECAY
KW - JETS
UR - http://www.scopus.com/inward/record.url?scp=85060435660&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.99.012001
DO - 10.1103/PhysRevD.99.012001
M3 - Article
AN - SCOPUS:85060435660
VL - 99
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 1
M1 - 012001
ER -