Searches for heavy long-lived charged particles with the ATLAS detector in proton-proton collisions at s = 8 TeV

摘要

Searches for heavy long-lived charged particles are performed using a data sample of 19.1 fb−1 from proton-proton collisions at a centre-of-mass energy of ( sqrt{s}=8 ) TeV collected by the ATLAS detector at the Large Hadron Collider. No excess is observed above the estimated background and limits are placed on the mass of long-lived particles in various supersymmetric models. Long-lived tau sleptons in models with gauge-mediated symmetry breaking are excluded up to masses between 440 and 385 GeV for tan β between 10 and 50, with a 290 GeV limit in the case where only direct tau slepton production is considered. In the context of simplified LeptoSUSY models, where sleptons are stable and have a mass of 300 GeV, squark and gluino masses are excluded up to a mass of 1500 and 1360 GeV, respectively. Directly produced charginos, in simplified models where they are nearly degenerate to the lightest neutralino, are excluded up to a mass of 620 GeV. R-hadrons, composites containing a gluino, bottom squark or top squark, are excluded up to a mass of 1270, 845 and 900 GeV, respectively, using the full detector; and up to a mass of 1260, 835 and 870 GeV using an approach disregarding information from the muon spectrometer. Keywords Hadron-Hadron Scattering ArXiv ePrint: 1411.​6795 Deceased (W. Blum, A. Bogouch, H. M. Braun, V. Chernyatin, B. A. Dolgoshein, A. A. Komar, K. W. McFarlane, S. V. Mouraviev, F. Pastore, G. Sauvage, D. M. Seliverstov, A. N. Sisakyan, R. D. St. Denis, P. Stavina, R. P. Thun, T. Todorov) Page %P Close Plain text Look Inside Reference tools Export citation Add to Papers Other actions Register for Journal Updates About This Journal Reprints and Permissions Share Share this content on Facebook Share this content on Twitter Share this content on LinkedIn Related Content Supplementary Material (0) References (79) References[1]M. Fairbairn et al., Stable massive particles at colliders, Phys. Rept. 438 (2007) 1 [hep-ph/​0611040] [INSPIRE].ADSCrossRef[2]H. Miyazawa, Baryon number changing currents, Prog. Theor. Phys. 36 (1966) 1266 [INSPIRE].ADSCrossRef[3]P. Ramond, Dual theory for free fermions, Phys. Rev. D 3 (1971) 2415 [INSPIRE].ADSMathSciNet[4]Y. Golfand and E.P. Likhtman, Extension of the algebra of Poincaré group generators and violation of p invariance, JETP Lett. 13 (1971) 323 [Pisma Zh. Eksp. Teor. Fiz. 13 (1971) 452] [INSPIRE].[5]A. Neveu and J.H. Schwarz, Factorizable dual model of pions, Nucl. Phys. B 31 (1971) 86 [INSPIRE].ADSCrossRef[6]A. Neveu and J.H. Schwarz, Quark model of dual pions, Phys. Rev. D 4 (1971) 1109 [INSPIRE].ADS[7]J.-L. Gervais and B. Sakita, Field theory interpretation of supergauges in dual models, Nucl. Phys. B 34 (1971) 632 [INSPIRE].ADSCrossRefMathSciNet[8]D.V. Volkov and V.P. Akulov, Is the neutrino a Goldstone particle?, Phys. Lett. B 46 (1973) 109 [INSPIRE].ADSCrossRef[9]J. Wess and B. Zumino, A lagrangian model invariant under supergauge transformations, Phys. Lett. B 49 (1974) 52 [INSPIRE].ADSCrossRef[10]J. Wess and B. Zumino, Supergauge transformations in four-dimensions, Nucl. Phys. B 70 (1974) 39 [INSPIRE].ADSCrossRefMathSciNet[11]P. Fayet, Supersymmetry and weak, electromagnetic and strong interactions, Phys. Lett. B 64 (1976) 159 [INSPIRE].ADSCrossRef[12]P. Fayet, Spontaneously broken supersymmetric theories of weak, electromagnetic and strong interactions, Phys. Lett. B 69 (1977) 489 [INSPIRE].ADSCrossRef[13]G.R. Farrar and P. Fayet, Phenomenology of the produ