Measuring slepton masses and mixings at the LHC. (English) Zbl 1269.81211

Summary: Flavor physics may help us understand theories beyond the standard model. In the context of supersymmetry, if we can measure the masses and mixings of sleptons and squarks, we may learn something about supersymmetry and supersymmetry breaking. Here we consider a hybrid gauge-gravity supersymmetric model in which the observed masses and mixings of the standard model leptons are explained by a \(U(1)\times U(1)\) flavor symmetry. In the supersymmetric sector, the charged sleptons have reasonably large flavor mixings, and the lightest is metastable. As a result, supersymmetric events are characterized not by missing energy, but by heavy metastable charged particles. Many supersymmetric events are therefore fully reconstructible, and we can reconstruct most of the charged sleptons by working up the long supersymmetric decay chains. We obtain promising results for both masses and mixings, and conclude that, given a favorable model, precise measurements at the LHC may help shed light not only on new physics, but also on the standard model flavor parameters.


81V22 Unified quantum theories
81T60 Supersymmetric field theories in quantum mechanics
81V15 Weak interaction in quantum theory
81V05 Strong interaction, including quantum chromodynamics
81R40 Symmetry breaking in quantum theory
Full Text: DOI arXiv


[1] Arkani-Hamed, N.; Cheng, H-C; Feng, JL; Hall, LJ, Probing lepton flavor violation at future colliders, Phys. Rev. Lett., 77, 1937, (1996)
[2] Arkani-Hamed, N.; Feng, JL; Hall, LJ; Cheng, H-C, CP violation from slepton oscillations at the LHC and NLC, Nucl. Phys., B 505, 3, (1997)
[3] Agashe, K.; Graesser, M., Signals of supersymmetric lepton flavor violation at the LHC, Phys. Rev., D 61, 075008, (2000)
[4] Hisano, J.; Kitano, R.; Nojiri, MM, Slepton oscillation at large hadron collider, Phys. Rev., D 65, 116002, (2002)
[5] Goto, T.; Kawagoe, K.; Nojiri, MM, Study of the slepton non-universality at the CERN large hadron collider, Phys. Rev., D 70, 075016, (2004)
[6] Kitano, R., A Clean slepton mixing signal at the LHC, JHEP, 03, 023, (2008)
[7] Allanach, BC; Conlon, JP; Lester, CG, Measuring smuon-selectron mass splitting at the CERN LHC and patterns of supersymmetry breaking, Phys. Rev., D 77, 076006, (2008)
[8] Kaneko, S.; Sato, J.; Shimomura, T.; Vives, O.; Yamanaka, M., Measuring lepton flavour violation at LHC with long-lived slepton in the coannihilation region, Phys. Rev., D 78, 116013, (2008)
[9] Simone, A.; Fan, J.; Sanz, V.; Skiba, W., Leptogenic supersymmetry, Phys. Rev., D 80, 035010, (2009)
[10] Feng, JL; Lester, CG; Nir, Y.; Shadmi, Y., The standard model and supersymmetric flavor puzzles at the large hadron collider, Phys. Rev., D 77, 076002, (2008)
[11] Chacko, Z.; Ponton, E., Yukawa deflected gauge mediation, Phys. Rev., D 66, 095004, (2002)
[12] Mohapatra, RN; Okada, N.; Yu, H-B, Ν-GMSB with type III seesaw and phenomenology, Phys. Rev., D 78, 075011, (2008)
[13] Feng, JL; Moroi, T., Tevatron signatures of longlived charged sleptons in gauge mediated supersymmetry breaking models, Phys. Rev., D 58, 035001, (1998)
[14] Froggatt, CD; Nielsen, HB, Hierarchy of quark masses, cabibbo angles and cp-violation, Nucl. Phys., B 147, 277, (1979)
[15] Nir, Y.; Seiberg, N., Should squarks be degenerate?, Phys. Lett., B 309, 337, (1993)
[16] Ross, GG; Vives, O., Yukawa structure, flavour and CP-violation in supergravity, Phys. Rev., D 67, 095013, (2003)
[17] Engelhard, G.; Feng, JL; Galon, I.; Sanford, D.; Yu, F., SPICE: simulation package for including flavor in collider events, Comput. Phys. Commun., 181, 213, (2010)
[18] Allanach, BC, SOFTSUSY: A C++ program for calculating supersymmetric spectra, Comput. Phys. Commun., 143, 305, (2002)
[19] Allanach, BC; Bernhardt, MA, Including R-parity violation in the numerical computation of the spectrum of the minimal supersymmetric standard model: SOFTSUSY3.0, comput, Phys. Commun., 181, 232, (2010)
[20] Djouadi, A.; Muhlleitner, MM; Spira, M., Decays of supersymmetric particles: the program SUSY-HIT (suspect-sdecay-HDECAY-interface), Acta Phys. Polon., B 38, 635, (2007)
[21] Feng, JL; Galon, I.; Sanford, D.; Shadmi, Y.; Yu, F., Three-body decays of sleptons with general flavor violation and left-right mixing, Phys. Rev., D 79, 116009, (2009)
[22] Marchesini, G.; etal., HERWIG: a Monte Carlo event generator for simulating hadron emission reactions with interfering gluons. version 5.1 -April 1991, Comput. Phys. Commun., 67, 465, (1992)
[23] Corcella, G.; etal., HERWIG 6.5: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes), JHEP, 01, 010, (2001)
[24] Skands, PZ; etal., SUSY LES houches accord: interfacing SUSY spectrum calculators, decay packages and event generators, JHEP, 07, 036, (2004)
[25] E. Richter-Was, AcerDET: A particle level fast simulation and reconstruction package for phenomenological studies on high p_{\(T\)}physics at LHC, hep-ph/0207355 [SPIRES].
[26] ATLAS collaboration, G. Aad et al., The ATLAS Experiment at the CERN Large Hadron Collider, 2008 JINST3 S08003 [SPIRES].
[27] Ellis, JR; Raklev, AR; Oye, OK, Gravitino dark matter scenarios with massive metastable charged sparticles at the LHC, JHEP, 10, 061, (2006)
[28] Tarem, S.; Bressler, S.; Nomoto, H.; Mattia, A., Trigger and reconstruction for heavy long-lived charged particles with the ATLAS detector, Eur. Phys. J., C 62, 281, (2009)
[29] Feng, JL; Rajaraman, A.; Smith, BT, Minimal supergravity with m_{0}\^{}{2} < 0, Phys. Rev., D 74, 015013, (2006)
[30] Rajaraman, A.; Smith, BT, Discovering SUSY with m(0)\^{}{2} < 0 in the first CERN LHC physics run, Phys. Rev., D 75, 115015, (2007)
[31] Rajaraman, A.; Smith, BT, Determining spins of metastable sleptons at the large hadron collider, Phys. Rev., D 76, 115004, (2007)
[32] The CMS collaboration, Search for heavy stable charged particles with 100/pb and 1/fb in the CMS experiment, CMS-PAS-EXO-08-003.
[33] Feng, JL; French, ST; Lester, CG; Nir, Y.; Shadmi, Y., The shifted peak: resolving nearly degenerate particles at the LHC, Phys. Rev., D 80, 114004, (2009)
This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. It attempts to reflect the references listed in the original paper as accurately as possible without claiming the completeness or perfect precision of the matching.