Abstract
New physics signals containing five or more b-tagged jets, but without T or leptons, could realistically be sitting within the current 8 TeV LHC data set without receiving meaningful constraints from any of the existing LHC searches at either ATLAS or CMS. This work provides several examples of simple, motivated models that yield final states containing many b-jets. To study the potential for uncovering new physics in these high b-jet multiplicity channels, this paper focuses on a natural supersymmetry scenario where each of the pair-produced stops decays to an on-shell chargino, which subsequently decays via an MFV-motivated, R-parity violating coupling. This gives rise to an eight-jet final state containing six b-quarks. Although no public measurements exist, estimates indicate that the standard model backgrounds in high b-jet multiplicity channels should be very small. To circumvent the background uncertainty, an asymmetric method is presented that utilizes two different techniques to conservatively exclude or to discover new physics in high b-jet multiplicity final states.
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References
CMS collaboration, Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC, Phys. Lett. B 716 (2012) 30 [arXiv:1207.7235] [INSPIRE].
ATLAS collaboration, Observation of a new particle in the search for the standard model Higgs boson with the ATLAS detector at the LHC, Phys. Lett. B 716 (2012) 1 [arXiv:1207.7214] [INSPIRE].
N. Craig, The state of supersymmetry after run I of the LHC, arXiv:1309.0528 [INSPIRE].
J.L. Feng, Naturalness and the status of supersymmetry, Ann. Rev. Nucl. Part. Sci. 63 (2013) 351 [arXiv:1302.6587] [INSPIRE].
L. Randall and D. Tucker-Smith, Dijet searches for supersymmetry at the LHC, Phys. Rev. Lett. 101 (2008) 221803 [arXiv:0806.1049] [INSPIRE].
C. Rogan, Kinematical variables towards new dynamics at the LHC, arXiv:1006.2727 [INSPIRE].
CMS collaboration, A search for new physics in events with high jet and b-tagged jet multiplicities and one lepton, CMS-PAS-SUS-12-015 (2013).
N. Craig and S. Thomas, Exclusive signals of an extended Higgs sector, JHEP 11 (2012) 083 [arXiv:1207.4835] [INSPIRE].
M. Rubin, G.P. Salam and S. Sapeta, Giant QCD K-factors beyond NLO, JHEP 09 (2010) 084 [arXiv:1006.2144] [INSPIRE].
G. D’Ambrosio, G.F. Giudice, G. Isidori and A. Strumia, Minimal flavor violation: an effective field theory approach, Nucl. Phys. B 645 (2002) 155 [hep-ph/0207036] [INSPIRE].
K. Agashe, M. Papucci, G. Perez and D. Pirjol, Next to minimal flavor violation, hep-ph/0509117 [INSPIRE].
Y. Nomura, M. Papucci and D. Stolarski, Flavorful supersymmetry, Phys. Rev. D 77 (2008) 075006 [arXiv:0712.2074] [INSPIRE].
J.A. Evans and D. Shih, Surveying extended GMSB models with m h = 125 GeV, JHEP 08 (2013) 093 [arXiv:1303.0228] [INSPIRE].
M. Papucci, J.T. Ruderman and A. Weiler, Natural SUSY endures, JHEP 09 (2012) 035 [arXiv:1110.6926] [INSPIRE].
P.J. Fox, A.E. Nelson and N. Weiner, Dirac gaugino masses and supersoft supersymmetry breaking, JHEP 08 (2002) 035 [hep-ph/0206096] [INSPIRE].
G.D. Kribs and A. Martin, Supersoft supersymmetry is super-safe, Phys. Rev. D 85 (2012) 115014 [arXiv:1203.4821] [INSPIRE].
E. Nikolidakis and C. Smith, Minimal flavor violation, seesaw and R-parity, Phys. Rev. D 77 (2008) 015021 [arXiv:0710.3129] [INSPIRE].
C. Csáki, Y. Grossman and B. Heidenreich, MFV SUSY: a natural theory for R-parity violation, Phys. Rev. D 85 (2012) 095009 [arXiv:1111.1239] [INSPIRE].
G. Krnjaic and D. Stolarski, Gauging the way to MFV, JHEP 04 (2013) 064 [arXiv:1212.4860] [INSPIRE].
R. Franceschini and R.N. Mohapatra, New patterns of natural R-parity violation with supersymmetric gauged flavor, JHEP 04 (2013) 098 [arXiv:1301.3637] [INSPIRE].
C. Csáki and B. Heidenreich, A complete model for R-parity violation, Phys. Rev. D 88 (2013) 055023 [arXiv:1302.0004] [INSPIRE].
R. Franceschini and R. Torre, RPV stops bump off the background, Eur. Phys. J. C 73 (2013) 2422 [arXiv:1212.3622] [INSPIRE].
Y. Bai, A. Katz and B. Tweedie, Pulling out all the stops: searching for RPV SUSY with stop-jets, JHEP 01 (2014) 040 [arXiv:1309.6631] [INSPIRE].
J.A. Evans and Y. Kats, LHC coverage of RPV MSSM with light stops, JHEP 04 (2013) 028 [arXiv:1209.0764] [INSPIRE].
J.A. Evans and Y. Kats, LHC searches examined via the RPV MSSM, PoS(EPS-HEP 2013)287 [arXiv:1311.0890] [INSPIRE].
M.J. Strassler and K.M. Zurek, Echoes of a hidden valley at hadron colliders, Phys. Lett. B 651 (2007) 374 [hep-ph/0604261] [INSPIRE].
M.J. Strassler, On the phenomenology of hidden valleys with heavy flavor, arXiv:0806.2385 [INSPIRE].
J. Fan, M. Reece and J.T. Ruderman, Stealth supersymmetry, JHEP 11 (2011) 012 [arXiv:1105.5135] [INSPIRE].
J. Fan, M. Reece and J.T. Ruderman, A stealth supersymmetry sampler, JHEP 07 (2012) 196 [arXiv:1201.4875] [INSPIRE].
J.A. Evans, Y. Kats, D. Shih and M.J. Strassler, Toward full LHC coverage of natural supersymmetry, JHEP 07 (2014) 101 [arXiv:1310.5758] [INSPIRE].
N. Craig, J. Galloway and S. Thomas, Searching for signs of the second Higgs doublet, arXiv:1305.2424 [INSPIRE].
J.A. Aguilar-Saavedra, R. Benbrik, S. Heinemeyer and M. Pérez-Victoria, Handbook of vectorlike quarks: Mixing and single production, Phys. Rev. D 88 (2013) 094010 [arXiv:1306.0572] [INSPIRE].
A. Azatov et al., Higgs boson production via vector-like top-partner decays: diphoton or multilepton plus multijets channels at the LHC, Phys. Rev. D 85 (2012) 115022 [arXiv:1204.0455] [INSPIRE].
CMS collaboration, Identification of b-quark jets with the CMS experiment, 2013 JINST 8 P04013 [arXiv:1211.4462] [INSPIRE].
ATLAS collaboration, Search for strongly produced superpartners in final states with two same sign leptons with the ATLAS detector using 21 fb −1 of proton-proton collisions at \( \sqrt{s} \) = 8 TeV, ATLAS-CONF-2013-007 (2013).
B. Dahmes, private communication (2013).
CMS collaboration, Measurement of the cross section ratio σ(\( t\overline{t} b\overline{b} \))/(\( t\overline{t} jj \)) in pp collisions at \( \sqrt{s} \) = 8 TeV, CMS-PAS-TOP-13-010 (2013).
M.L. Mangano, M. Moretti, F. Piccinini, R. Pittau and A.D. Polosa, ALPGEN, a generator for hard multiparton processes in hadronic collisions, JHEP 07 (2003) 001 [hep-ph/0206293] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, A brief introduction to PYTHIA 8.1, Comput. Phys. Commun. 178 (2008) 852 [arXiv:0710.3820] [INSPIRE].
J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: going beyond, JHEP 06 (2011) 128 [arXiv:1106.0522] [INSPIRE].
CMS collaboration, Search for multijet resonances in the 8-jet final state, CMS-PAS-EXO-11-075 (2012).
R. Corke and T. Sjöstrand, Improved parton showers at large transverse momenta, Eur. Phys. J. C 69 (2010) 1 [arXiv:1003.2384] [INSPIRE].
CDF collaboration, T. Aaltonen et al., First search for multijet resonances in \( \sqrt{s} \) = 1.96 TeV \( p\overline{p} \) collisions, Phys. Rev. Lett. 107 (2011) 042001 [arXiv:1105.2815] [INSPIRE].
CMS collaboration, Search for three-jet resonances in pp collisions at \( \sqrt{s} \) = 7 TeV, Phys. Rev. Lett. 107 (2011) 101801 [arXiv:1107.3084] [INSPIRE].
CMS collaboration, Search for three-jet resonances in pp collisions at \( \sqrt{s} \) = 7 TeV, Phys. Lett. B 718 (2012) 329 [arXiv:1208.2931] [INSPIRE].
CMS collaboration, Searches for light- and heavy-flavour three-jet resonances in pp collisions at \( \sqrt{s} \) = 8 TeV, Phys. Lett. B 730 (2014) 193 [arXiv:1311.1799] [INSPIRE].
ATLAS collaboration, Measurement of the jet multiplicity in top anti-top final states produced in 7 TeV proton-proton collisions with the ATLAS detector, ATLAS-CONF-2012-155 (2012).
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Evans, J.A. A swarm of Bs. J. High Energ. Phys. 2014, 73 (2014). https://doi.org/10.1007/JHEP08(2014)073
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DOI: https://doi.org/10.1007/JHEP08(2014)073