# General neutralino NLSPs at the early LHC

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## Abstract

Gauge mediated supersymmetry breaking (GMSB) is a theoretically well-motivated framework with rich and varied collider phenomenology. In this paper, we study the Tevatron limits and LHC discovery potential for a wide class of GMSB scenarios in which the next-to-lightest superpartner (NLSP) is a promptly-decaying neutralino. These scenarios give rise to signatures involving hard photons, *W* ’s, *Z*’s, jets and/or higgses, plus missing energy. In order to characterize these signatures, we define a small number of minimal spectra, in the context of General Gauge Mediation, which are parameterized by the mass of the NLSP and the gluino. Using these minimal spectra, we determine the most promising discovery channels for general neutralino NLSPs. We find that the 2010 dataset can already cover new ground with strong production for all NLSP types. With the upcoming 2011-2012 dataset, we find that the LHC will also have sensitivity to direct electroweak production of neutralino NLSPs.

## Keywords

Supersymmetry Phenomenology## References

- [1]G. Giudice and R. Rattazzi,
*Theories with gauge mediated supersymmetry breaking*,*Phys.***322**(1999) 419 [hep-ph/9801271] [INSPIRE].Google Scholar - [2]S. Dimopoulos, M. Dine, S. Raby and S.D. Thomas,
*Experimental signatures of low-energy gauge mediated supersymmetry breaking*,*Phys. Rev. Lett.***76**(1996) 3494 [hep-ph/9601367] [INSPIRE].ADSCrossRefGoogle Scholar - [3]S. Dimopoulos, M. Dine, S. Raby, S.D. Thomas and J.D. Wells,
*Phenomenological implications of low-energy supersymmetry breaking*,*Nucl. Phys. Proc. Suppl.***52A**(1997) 38 [hep-ph/9607450] [INSPIRE].ADSCrossRefGoogle Scholar - [4]S. Dimopoulos, S.D. Thomas and J.D. Wells,
*Sparticle spectroscopy and electroweak symmetry breaking with gauge mediated supersymmetry breaking*,*Nucl. Phys.***B 488**(1997) 39 [hep-ph/9609434] [INSPIRE].ADSCrossRefGoogle Scholar - [5]S. Ambrosanio, G.D. Kribs and S.P. Martin,
*Signals for gauge mediated supersymmetry breaking models at the CERN LEP-2 collider*,*Phys. Rev.***D 56**(1997) 1761 [hep-ph/9703211] [INSPIRE].ADSGoogle Scholar - [6]H. Baer, P. Mercadante, X. Tata and Y.-l. Wang,
*The reach of Tevatron upgrades in gauge mediated supersymmetry breaking models*,*Phys. Rev.***D 60**(1999) 055001 [hep-ph/9903333] [INSPIRE].ADSGoogle Scholar - [7]K.T. Matchev and S.D. Thomas,
*Higgs and Z boson signatures of supersymmetry*,*Phys. Rev.***D 62**(2000) 077702 [hep-ph/9908482] [INSPIRE].ADSGoogle Scholar - [8]SUSY Working Group collaboration, R.L. Culbertson et al.,
*Low scale and gauge mediated supersymmetry breaking at the Fermilab Tevatron Run II*, hep-ph/0008070 [INSPIRE]. - [9]P. Meade, N. Seiberg and D. Shih,
*General gauge mediation*,*Prog. Theor. Phys. Suppl.***177**(2009)143 [arXiv:0801.3278] [INSPIRE].ADSMATHCrossRefGoogle Scholar - [10]M. Buican, P. Meade, N. Seiberg and D. Shih,
*Exploring general gauge mediation*,*JHEP***03**(2009)016 [arXiv:0812.3668] [INSPIRE].MathSciNetADSCrossRefGoogle Scholar - [11]P. Meade, M. Reece and D. Shih,
*Prompt decays of general neutralino NLSPs at the Tevatron*,*JHEP***05**(2010) 105 [arXiv:0911.4130] [INSPIRE].ADSCrossRefGoogle Scholar - [12]H. Baer, P.G. Mercadante, X. Tata and Y.-l. Wang,
*The reach of the CERN Large Hadron Collider for gauge mediated supersymmetry breaking models*,*Phys. Rev.***D 62**(2000) 095007 [hep-ph/0004001] [INSPIRE].ADSGoogle Scholar - [13]P. Meade, M. Reece and D. Shih,
*Long-lived neutralino NLSPs*,*JHEP***10**(2010) 067 [arXiv:1006.4575] [INSPIRE].ADSCrossRefGoogle Scholar - [14]J.T. Ruderman and D. Shih,
*Slepton co-NLSPs at the Tevatron*,*JHEP***11**(2010) 046 [arXiv:1009.1665] [INSPIRE].ADSCrossRefGoogle Scholar - [15]
- [16]A. Rajaraman, Y. Shirman, J. Smidt and F. Yu,
*Parameter space of general gauge mediation*,*Phys. Lett.***B 678**(2009) 367 [arXiv:0903.0668] [INSPIRE].ADSGoogle Scholar - [17]S. Abel, M.J. Dolan, J. Jaeckel and V.V. Khoze,
*Phenomenology of pure general gauge mediation*,*JHEP***12**(2009) 001 [arXiv:0910.2674] [INSPIRE].MathSciNetADSCrossRefGoogle Scholar - [18]A. Katz and B. Tweedie,
*Signals of a sneutrino (N)LSP at the LHC*,*Phys. Rev.***D 81**(2010) 035012 [arXiv:0911.4132] [INSPIRE].ADSGoogle Scholar - [19]A. Katz and B. Tweedie,
*Leptophilic signals of a sneutrino (N)LSP and flavor biases from flavor-blind SUSY*,*Phys. Rev.***D 81**(2010) 115003 [arXiv:1003.5664] [INSPIRE].ADSGoogle Scholar - [20]S. Abel, M.J. Dolan, J. Jaeckel and V.V. Khoze,
*Pure general gauge mediation for early LHC searches*,*JHEP***12**(2010) 049 [arXiv:1009.1164] [INSPIRE].ADSCrossRefGoogle Scholar - [21]A.M. Thalapillil,
*Low-energy observables and general gauge mediation in the MSSM and NMSSM*,*JHEP***06**(2011) 059 [arXiv:1012.4829] [INSPIRE].ADSCrossRefGoogle Scholar - [22]J. Jaeckel, V.V. Khoze and C. Wymant,
*Mass sum rules and the role of the messenger scale in general gauge mediation*,*JHEP***04**(2011) 126 [arXiv:1102.1589] [INSPIRE].ADSCrossRefGoogle Scholar - [23]J. Jaeckel, V.V. Khoze and C. Wymant,
*RG invariants, unification and the role of the messenger scale in general gauge mediation*,*JHEP***05**(2011) 132 [arXiv:1103.1843] [INSPIRE].ADSCrossRefGoogle Scholar - [24]H. Baer, P.G. Mercadante, F. Paige, X. Tata and Y. Wang,
*LHC reach for gauge mediated supersymmetry breaking models via prompt photon channels*,*Phys. Lett.***B 435**(1998) 109 [hep-ph/9806290] [INSPIRE].ADSGoogle Scholar - [25]E. Nakamura and S. Shirai,
*Discovery potential for low-scale gauge mediation at early LHC*,*JHEP***03**(2011) 115 [arXiv:1010.5995] [INSPIRE].ADSCrossRefGoogle Scholar - [26]M. Dine and A.E. Nelson,
*Dynamical supersymmetry breaking at low-energies*,*Phys. Rev.***D 48**(1993) 1277 [hep-ph/9303230] [INSPIRE].ADSGoogle Scholar - [27]M. Dine, A.E. Nelson and Y. Shirman,
*Low-energy dynamical supersymmetry breaking simplified*,*Phys. Rev.***D 51**(1995) 1362 [hep-ph/9408384] [INSPIRE].ADSGoogle Scholar - [28]M. Dine, A.E. Nelson, Y. Nir and Y. Shirman,
*New tools for low-energy dynamical supersymmetry breaking*,*Phys. Rev.***D 53**(1996) 2658 [hep-ph/9507378] [INSPIRE].ADSGoogle Scholar - [29]S. Dube, J. Glatzer, S. Somalwar, A. Sood and S. Thomas,
*Addressing the multi-channel inverse problem at high energy colliders: a model independent approach to the search for new physics with trileptons*,*J. Phys.***G 39**(2012) 085004 [arXiv:0808.1605] [INSPIRE].ADSGoogle Scholar - [30]J. Alwall, M.-P. Le, M. Lisanti and J.G. Wacker,
*Model-independent jets plus missing energy searches*,*Phys. Rev*.**D 79**(2009) 015005 [arXiv:0809.3264] [INSPIRE].ADSGoogle Scholar - [31]J. Alwall, P. Schuster and N. Toro,
*Simplified models for a first characterization of new physics at the LHC*,*Phys. Rev.***D 79**(2009) 075020 [arXiv:0810.3921] [INSPIRE].ADSGoogle Scholar - [32]D.S. Alves, E. Izaguirre and J.G. Wacker,
*Where the sidewalk ends: jets and missing energy search strategies for the 7 TeV LHC*,*JHEP***10**(2011) 012 [arXiv:1102.5338] [INSPIRE].ADSCrossRefGoogle Scholar - [33]LHC New Physics Working Group collaboration, D. Alves et al.,
*Simplified models for LHC new physics searches*, arXiv:1105.2838 [INSPIRE]. - [34]D0 collaboration, V.M. Abazov et al.,
*Search for diphoton events with large missing transverse energy in*6*.*3*fb*^{−1}*of*\( p\overline p \)*collisions at*\( \sqrt {s} = 1.96\;\;TeV \),*Phys. Rev. Lett.***105**(2010) 221802 [arXiv:1008.2133] [INSPIRE].ADSCrossRefGoogle Scholar - [35]CDF collaboration, A. Abulencia et al.,
*Search for new physics in lepton + photon + X events with*929*pb*^{−1}*of*\( p\overline p \)*collisions at*\( \sqrt {s} = 1.96\;\;TeV \),*Phys. Rev.***D 75**(2007) 112001 [hep-ex/0702029] [INSPIRE].ADSGoogle Scholar - [36]D0 collaboration, V. Abazov et al.,
*Search for squarks and gluinos in events with jets and missing transverse energy using*2*.*1*fb*^{−1}*of*\( p\overline p \)*collision data at*\( \sqrt {s} = 1.96\;\;TeV \),*Phys. Lett.***B 660**(2008)449 [arXiv:0712.3805] [INSPIRE].ADSGoogle Scholar - [37]CDF collaboration,
*Search for gaugino production in the W + Z + missing transverse energy final state*, CDF Public Note 9791.Google Scholar - [38]CMS collaboration, S. Chatrchyan et al.,
*Search for supersymmetry in pp collisions at*\( \sqrt {s} = 7\;\;TeV \)*in events with two photons and missing transverse energy*,*Phys. Rev. Lett.***106**(2011) 211802 [arXiv:1103.0953] [INSPIRE].ADSCrossRefGoogle Scholar - [39]CMS collaboration, V. Khachatryan et al.,
*Search for supersymmetry in pp collisions at*7*TeV in events with jets and missing transverse energy*,*Phys. Lett.***B 698**(2011) 196 [arXiv:1101.1628] [INSPIRE].ADSGoogle Scholar - [40]ATLAS collaboration, G. Aad et al.,
*Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in*\( \sqrt {s} = 7\;\;TeV \)*proton-proton collisions*,*Phys. Lett.***B 701**(2011) 186 [arXiv:1102.5290] [INSPIRE].ADSGoogle Scholar - [41]ATLAS collaboration, G. Aad et al.,
*Search for supersymmetry using final states with one lepton, jets and missing transverse momentum with the ATLAS detector in*\( \sqrt {s} = 7\;\;TeV \)*pp*,*Phys. Rev. Lett.***106**(2011) 131802 [arXiv:1102.2357] [INSPIRE].ADSCrossRefGoogle Scholar - [42]J. Thaler and Z. Thomas,
*Goldstini can give the Higgs a boost*,*JHEP***07**(2011) 060 [arXiv:1103.1631] [INSPIRE].ADSCrossRefGoogle Scholar - [43]S.P. Martin and P. Ramond,
*Sparticle spectrum constraints*,*Phys. Rev.***D 48**(1993) 5365 [hep-ph/9306314] [INSPIRE].ADSGoogle Scholar - [44]W. Beenakker, R. Hopker, M. Spira and P. Zerwas,
*Squark and gluino production at hadron colliders*,*Nucl. Phys.***B 492**(1997) 51 [hep-ph/9610490] [INSPIRE].ADSGoogle Scholar - [45]W. Beenakker et al.,
*The production of charginos/neutralinos and sleptons at hadron colliders*,*Phys. Rev. Lett.***83**(1999) 3780 [*Erratum ibid.***100**(2008) 029901] [hep-ph/9906298] [INSPIRE].ADSCrossRefGoogle Scholar - [46]T. Sjöstrand, S. Mrenna and P.Z. Skands,
*PYTHIA 6.4 physics and manual*,*JHEP***05**(2006) 026 [hep-ph/0603175] [INSPIRE].ADSCrossRefGoogle Scholar - [47]J. Conway,
*PGS: Pretty Good Simulator*, http://physics.ucdavis.edu/˜conway/research/ software/pgs/pgs4-general.htm. - [48]CMS collaboration,
*Data-driven background estimates for SUSY di-photon searches*CMS-PAS-SUS-09-004 (2009).Google Scholar - [49]T. Junk,
*Confidence level computation for combining searches with small statistics*,*Nucl. Instrum. Meth.***A 434**(1999) 435 [hep-ex/9902006] [INSPIRE].ADSGoogle Scholar - [50]CDF collaboration, A. Abulencia et al.,
*Inclusive search for new physics with like-sign dilepton events in pp collisions at*\( \sqrt {s} = 1.96\;\;TeV \),*Phys. Rev. Lett.***98**(2007) 221803 [hep-ex/0702051] [INSPIRE].ADSCrossRefGoogle Scholar - [51]J. Alwall et al.,
*MadGraph/MadEvent v4: the new web generation*,*JHEP***09**(2007) 028 [arXiv:0706.2334] [INSPIRE].ADSCrossRefGoogle Scholar - [52]M. Muhlleitner, A. Djouadi and Y. Mambrini,
*SDECAY: a Fortran code for the decays of the supersymmetric particles in the MSSM*,*Comput. Phys. Commun.***168**(2005) 46 [hep-ph/0311167] [INSPIRE].ADSCrossRefGoogle Scholar - [53]J.M. Campbell and R. Ellis,
*MCFM for the Tevatron and the LHC*,*Nucl. Phys. Proc. Suppl.***205**-**206**(2010) 10 [arXiv:1007.3492] [INSPIRE].CrossRefGoogle Scholar - [54]ATLAS collaboration,
*SUSY Searches at ATLAS in multilepton final states with jets and missing transverse energy*, ATLAS-CONF-2011-039 (2011).Google Scholar - [55]CMS collaboration, S. Chatrchyan et al.,
*Search for physics beyond the standard model in opposite-sign dilepton events at*\( \sqrt {s} = 7\;\;TeV \),*JHEP***06**(2011) 026 [arXiv:1103.1348] [INSPIRE].ADSCrossRefGoogle Scholar