Search for heavy long-lived charged particles in pp collisions at s=7 TeV Academic Article uri icon


  • The result of a search for heavy long-lived charged particles produced in pp collisions at s=7 TeV at the LHC is described. The data sample has been collected using the CMS detector and corresponds to an integrated luminosity of 5.0 fb-1. The inner tracking detectors are used to define a sample of events containing tracks with high momentum and high ionization energy loss. A second sample of events, which have high-momentum tracks satisfying muon identification requirements in addition to meeting high-ionization and long time-of-flight requirements, is analyzed independently. In both cases, the results are consistent with the expected background estimated from data. The results are used to establish cross section limits as a function of mass within the context of models with long-lived gluinos, scalar top quarks and scalar taus. Cross section limits on hyper-meson particles, containing new elementary long-lived hyper-quarks predicted by a vector-like confinement model, are also presented. Lower limits at 95% confidence level on the mass of gluinos (scalar top quarks) are found to be 1098 (737) GeV/c2. A limit of 928 (626) GeV/c2 is set for a gluino (scalar top quark) that hadronizes into a neutral bound state before reaching the muon detectors. The lower mass limit for a pair produced scalar tau is found to be 223 GeV/c2. Mass limits for a hyper-kaon are placed at 484, 602, and 747 GeV/c2 for hyper- masses of 800, 1200, and 1600 GeV/c2, respectively. 2012 CERN.

published proceedings

  • Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

altmetric score

  • 11.75

author list (cited authors)

  • Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., ... Delaere, C.

citation count

  • 56

complete list of authors

  • Chatrchyan, S||Khachatryan, V||Sirunyan, AM||Tumasyan, A||Adam, W||Bergauer, T||Dragicevic, M||Erö, J||Fabjan, C||Friedl, M||Frühwirth, R||Ghete, VM||Hammer, J||Hörmann, N||Hrubec, J||Jeitler, M||Kiesenhofer, W||Knünz, V||Krammer, M||Liko, D||Mikulec, I||Pernicka, M||Rahbaran, B||Rohringer, C||Rohringer, H||Schöfbeck, R||Strauss, J||Taurok, A||Teischinger, F||Wagner, P||Waltenberger, W||Walzel, G||Widl, E||Wulz, CE||Mossolov, V||Shumeiko, N||Suarez Gonzalez, J||Bansal, S||Cerny, K||Cornelis, T||De Wolf, EA||Janssen, X||Luyckx, S||Maes, T||Mucibello, L||Ochesanu, S||Roland, B||Rougny, R||Selvaggi, M||Van Haevermaet, H||Van Mechelen, P||Van Remortel, N||Van Spilbeeck, A||Blekman, F||Blyweert, S||D'Hondt, J||Gonzalez Suarez, R||Kalogeropoulos, A||Maes, M||Olbrechts, A||Van Doninck, W||Van Mulders, P||Van Onsem, GP||Villella, I||Charaf, O||Clerbaux, B||De Lentdecker, G||Dero, V||Gay, APR||Hreus, T||Léonard, A||Marage, PE||Reis, T||Thomas, L||Vander Velde, C||Vanlaer, P||Adler, V||Beernaert, K||Cimmino, A||Costantini, S||Garcia, G||Grunewald, M||Klein, B||Lellouch, J||Marinov, A||Mccartin, J||Ocampo Rios, AA||Ryckbosch, D||Strobbe, N||Thyssen, F||Tytgat, M||Vanelderen, L||Verwilligen, P||Walsh, S||Yazgan, E||Zaganidis, N||Basegmez, S||Bruno, G||Ceard, L||Delaere, C

publication date

  • July 2012