We study supersymmetric extensions of the Standard Model with small R-parity and lepton number violating couplings which are naturally consistent with primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter. We consider supergravity models where the gravitino is the lightest superparticle followed by a bino-like next-to-lightest superparticle (NLSP). Extending previous work we investigate in detail the sensitivity of LHC experiments to the R-parity breaking parameter ζ for various gluino and squark masses. We perform a simulation of signal and background events for the generic detector DELPHES for which we implement the finite NLSP decay length. We find that for gluino and squark masses accessible at the LHC, values of ζ can be probed which are one to two orders of magnitude smaller than the present upper bound obtained from astrophysics and cosmology.
L.J. Hall and M. Suzuki, Explicit R-Parity Breaking in Supersymmetric Models, Nucl. Phys. B 231 (1984) 419 [SPIRES].
G.G. Ross and J.W.F. Valle, Supersymmetric Models Without R-Parity, Phys. Lett. B 151 (1985) 375 [SPIRES].
J.R. Ellis, G. Gelmini, C. Jarlskog, G.G. Ross and J.W.F. Valle, Phenomenology of Supersymmetry with Broken R-Parity, Phys. Lett. B 150 (1985) 142 [SPIRES].
The Fermi-LAT collaboration, A.A. Abdo et al., The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data, Phys. Rev. Lett. 104 (2010) 101101 [arXiv:1002.3603] [SPIRES].
K. Desch, S. Fleischmann, P. Wienemann, H.K. Dreiner and S. Grab, Stau as the Lightest Supersymmetric Particle in R-Parity Violating SUSY Models: Discovery Potential with Early LHC Data, Phys. Rev. D 83 (2011) 015013 [arXiv:1008.1580] [SPIRES].
B. Mukhopadhyaya, S. Roy and F. Vissani, Correlation between neutrino oscillations and collider signals of supersymmetry in an R-parity violating model, Phys. Lett. B 443 (1998) 191 [hep-ph/9808265] [SPIRES].
ATLAS collaboration, G. Aad et al., Search for supersymmetric particles in events with lepton pairs and large missing transverse momentum in sqrts = 7 TeV proton-proton collisions with the ATLAS experiment, Eur. Phys. J. C 71 (2011) 1682 [arXiv:1103.6214] [SPIRES].
CMS collaboration, S. Chatrchyan et al., Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC, JHEP 06 (2011) 077 [arXiv:1104.3168] [SPIRES].
Particle Data Group collaboration, K. Nakamura et al., Review of particle physics, J. Phys. G 37 (2010) 075021 [SPIRES].
CMS collaboration, G.L. Bayatian et al., CMS technical design report, volume II: Physics performance, J. Phys. G 34 (2007) 995 [SPIRES].
B.C. Allanach and M.A. Bernhardt, Including R-parity violation in the numerical computation of the spectrum of the minimal supersymmetric standard model: SOFTSUSY3.2, Comput. Phys. Commun. 181 (2010) 232 [arXiv:0903.1805] [SPIRES].
J. Alwall et al., Madgraph: http://madgraph.hep.uiuc.edu/.
CMS collaboration, G. Bayatian et al., CMS physics: Technical design report, (2006).
G. Cowan,Sigcalc: http://www.pp.rhul.ac.uk/∼cowan/stat/SigCalc/.
ArXiv ePrint: 1107.0926
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Bobrovskyi, S., Buchmüller, W., Hajer, J. et al. Quasi-stable neutralinos at the LHC. J. High Energ. Phys. 2011, 119 (2011). https://doi.org/10.1007/JHEP09(2011)119
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