Abstract
Searches for new physics in high-multiplicity events with little or no missing energy are an important component of the LHC program, complementary to analyses that rely on missing energy. We consider the potential reach of searches for events with a lepton and six or more jets, and show they can provide increased sensitivity to many supersymmetric and exotic models that would not be detected through standard missing-energy analyses. Among these are supersymmetric models with gauge mediation, R-parity violation, and light hidden sectors. Moreover, ATLAS and CMS measurements suggest the primary background in this channel is from \( t\overline{t} \), rather than W +jets or QCD, which reduces the complexity of background modeling necessary for such a search. We also comment on related searches where the lepton is replaced with another visible object, such as a Z boson.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
ATLAS collaboration, G. Aad et al., Search for supersymmetric particles in events with lepton pairs and large missing transverse momentum in \( \sqrt{s} \) = 7 TeV proton-proton collisions with the ATLAS experiment, Eur. Phys. J. C 71 (2011) 1682 [arXiv:1103.6214] [INSPIRE].
ATLAS collaboration, G. Aad et al., Search for an excess of events with an identical flavour lepton pair and significant missing transverse momentum in \( \sqrt{s} \) = 7 TeV proton-proton collisions with the ATLAS detector, Eur. Phys. J. C 71 (2011) 1647 [arXiv:1103.6208] [INSPIRE].
ATLAS collaboration, G. Aad et al., Search for supersymmetry in pp collisions at \( \sqrt{s} \) = 7 TeV in final states with missing transverse momentum and B − jets, Phys. Lett. B 701 (2011)398 [arXiv:1103.4344] [INSPIRE].
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].
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].
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].
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].
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] [INSPIRE].
CMS collaboration, S. Chatrchyan et al., Search for supersymmetry in events with a lepton, a photon and large missing transverse energy in pp collisions at \( \sqrt{s} \) = 7 TeV, JHEP 06 (2011)093 [arXiv:1105.3152] [INSPIRE].
ATLAS collaboration, Search for microscopic black holes in multi-jet final states with the ATLAS detector at \( \sqrt{s} \) = 7 TeV, ATLAS-CONF-2011-068 (2011).
ATLAS collaboration, Search for new physics in multi-body final states at high invariant masses with ATLAS, ATLAS-CONF-2010-088 (2010).
CMS collaboration, V. Khachatryan et al., Search for microscopic black hole signatures at the large hadron collider, Phys. Lett. B 697 (2011) 434 [arXiv:1012.3375] [INSPIRE].
CDF collaboration, T. Aaltonen et al., Search for new particles leading to Z + jets final states in \( p\overline{p} \) collisions at \( \sqrt{s} \) = 1.96 TeV, Phys. Rev. D 76 (2007) 072006 [arXiv:0706.3264] [INSPIRE].
D0 collaboration, V. Abazov et al., A quasi model independent search for new physics at large transverse momentum, Phys. Rev. D 64 (2001) 012004 [hep-ex/0011067] [INSPIRE].
D0 collaboration, B. Abbott et al., A quasi-model-independent search for new high p T physics at DO, Phys. Rev. Lett. 86 (2001) 3712 [hep-ex/0011071] [INSPIRE].
CDF collaboration, T. Aaltonen et al., Model-independent and quasi-model-independent search for new physics at CDF, Phys. Rev. D 78 (2008) 012002 [arXiv:0712.1311] [INSPIRE].
CDF collaboration, T. Aaltonen et al., Global search for new physics with 2.0 fb −1 at CDF, Phys. Rev. D 79 (2009) 011101 [arXiv:0809.3781] [INSPIRE].
CDF collaboration, T. Aaltonen et al., Model-independent global search for new high-p T physics at CDF, arXiv:0712.2534 [INSPIRE].
CMS collaboration, MUSIC — An automated scan for deviations between data and Monte Carlo simulation, PAS-EXO-08-005 (2008).
CMS collaboration, Model unspecific search for new physics in pp collisions at \( \sqrt{s} \) = 7 TeV, PAS-EXO-10-021 (2010).
ATLAS collaboration, A search for new high-mass phenomena producing top quarks with the ATLAS experiment, ATLAS-CONF-2011-070 (2011).
ATLAS collaboration, Search for strong gravity effects in same-sign dimuon final states, ATLAS-CONF-2011-065 (2011).
CMS collaboration, A model independent search for new physics in an inclusive di-lepton event sample, PAS-EXO-10-024 (2010).
CMS collaboration, Search for supersymmetry in events with photons and low missing transverse energy, PAS-SUS-12-014 (2012).
ATLAS collaboration, G. Aad et al., Hunt for new phenomena using large jet multiplicities and missing transverse momentum with ATLAS in 4.7 fb −1 of \( \sqrt{s} \) = 7 TeV proton-proton collisions, JHEP 07 (2012) 167 [arXiv:1206.1760] [INSPIRE].
CMS collaboration, S. Chatrchyan et al., Jet production rates in association with W and Z bosons in pp collisions at \( \sqrt{s} \) = 7 TeV, JHEP 01 (2012) 010 [arXiv:1110.3226] [INSPIRE].
ATLAS collaboration, G. Aad et al., Study of jets produced in association with a W boson in pp collisions at \( \sqrt{s} \) = 7 TeV with the ATLAS detector, Phys. Rev. D 85 (2012) 092002 [arXiv:1201.1276] [INSPIRE].
T. Appelquist, H.-C. Cheng and B.A. Dobrescu, Bounds on universal extra dimensions, Phys. Rev. D 64 (2001) 035002 [hep-ph/0012100] [INSPIRE].
E. Katz, private communication.
T. Gregoire and E. Katz, A composite gluino at the LHC, JHEP 12 (2008) 084 [arXiv:0801.4799] [INSPIRE].
N. Arkani-Hamed, A.G. Cohen and H. Georgi, Electroweak symmetry breaking from dimensional deconstruction, Phys. Lett. B 513 (2001) 232 [hep-ph/0105239] [INSPIRE].
N. Arkani-Hamed, A. Cohen, E. Katz, A. Nelson, T. Gregoire, et al., The minimal moose for a little Higgs, JHEP 08 (2002) 021 [hep-ph/0206020] [INSPIRE].
E. Katz, J.-y. Lee, A.E. Nelson and D.G. Walker, A composite little Higgs model, JHEP 10 (2005)088 [hep-ph/0312287] [INSPIRE].
C.T. Hill and R.J. Hill, T − parity violation by anomalies, Phys. Rev. D 76 (2007) 115014 [arXiv:0705.0697] [INSPIRE].
CMS collaboration, S. Chatrchyan et al., Search for new physics with jets and missing transverse momentum in pp collisions at \( \sqrt{s} \) = 7 TeV, JHEP 08 (2011) 155 [arXiv:1106.4503] [INSPIRE].
V. Pavlunin and D. Stuart, Background modeling in new physics searches using forward events at LHC, Phys. Rev. D 78 (2008) 035012 [arXiv:0806.2338] [INSPIRE].
J. Alwall, P. Demin, S. de Visscher, R. Frederix, M. Herquet, et al., MadGraph/MadEvent v4: the new web generation, JHEP 09 (2007) 028 [arXiv:0706.2334] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
M. Mangano, Fermilab Monte Carlo workshop (2002), unpublished.
T. Plehn, D. Rainwater and P.Z. Skands, Squark and gluino production with jets, Phys. Lett. B 645 (2007) 217 [hep-ph/0510144] [INSPIRE].
A. Papaefstathiou and B. Webber, Effects of QCD radiation on inclusive variables for determining the scale of new physics at hadron colliders, JHEP 06 (2009) 069 [arXiv:0903.2013] [INSPIRE].
J. Alwall, K. Hiramatsu, M.M. Nojiri and Y. Shimizu, Novel reconstruction technique for new physics processes with initial state radiation, Phys. Rev. Lett. 103 (2009) 151802 [arXiv:0905.1201] [INSPIRE].
CMS collaboration, Combination of top pair production cross sections in pp collisions at 7 TeV and comparisons with theory, PAS-TOP-11-001 (2011).
ATLAS collaboration, Measurement of the top quark pair production cross-section with ATLAS in pp collisions at \( \sqrt{s} \) = 7 TeV in dilepton final states, ATLAS-CONF-2011-034 (2011).
M. Cacciari, G.P. Salam and G. Soyez, The \( {{\overline{k}}_t} \) jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [INSPIRE].
K.T. Matchev and S.D. Thomas, Higgs and Z boson signatures of supersymmetry, Phys. Rev. D 62 (2000) 077702 [hep-ph/9908482] [INSPIRE].
M.J. Strassler, Possible effects of a hidden valley on supersymmetric phenomenology, hep-ph/0607160 [INSPIRE].
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].
J. Pumplin, D. Stump, J. Huston, H. Lai, P.M. Nadolsky, et al., New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [INSPIRE].
J. Conway et al., Pretty good simulation of high energy collisions, http://physics.ucdavis.edu/~conway/research/software/pgs/pgs4-general.htm.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1107.5055
Rights and permissions
About this article
Cite this article
Lisanti, M., Schuster, P., Strassler, M. et al. Study of LHC searches for a lepton and many jets. J. High Energ. Phys. 2012, 81 (2012). https://doi.org/10.1007/JHEP11(2012)081
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP11(2012)081