Abstract
The presence of two light higgsinos nearly degenerate in mass is one of the important characteristics of supersymmetric models meeting the naturalness criteria. Probing such higgsinos at the LHC is very challenging, in particular when the mass-splitting between them is less than 5 GeV. In this study, we analyze such a degenerate higgsino scenario by exploiting the high collinearity between the two muons which originate from the decay of the heavier higgsino into the lighter one and which are accompanied by a high-p T QCD jet. Using our method, we can achieve a statistical significance ∼ 2.9 σ as well as S/B ∼ 17% with an integrated luminosity of 3000 fb−1 at the 14 TeV LHC, for the pair production of higgsinos with masses 124 GeV and 120 GeV. A good sensitivity can be achieved even for a smaller mass-splitting when the higgsinos are lighter.
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References
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].
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].
M. Carena and H.E. Haber, Higgs boson theory and phenomenology, Prog. Part. Nucl. Phys. 50 (2003) 63 [hep-ph/0208209] [INSPIRE].
A. Arbey, M. Battaglia, A. Djouadi, F. Mahmoudi and J. Quevillon, Implications of a 125 GeV Higgs for supersymmetric models, Phys. Lett. B 708 (2012) 162 [arXiv:1112.3028] [INSPIRE].
M. Carena, S. Gori, N.R. Shah and C.E.M. Wagner, A 125 GeV SM-like Higgs in the MSSM and the γγ rate, JHEP 03 (2012) 014 [arXiv:1112.3336] [INSPIRE].
J. Cao, Z. Heng, D. Li and J.M. Yang, Current experimental constraints on the lightest Higgs boson mass in the constrained MSSM, Phys. Lett. B 710 (2012) 665 [arXiv:1112.4391] [INSPIRE].
J.-J. Cao, Z.-X. Heng, J.M. Yang, Y.-M. Zhang and J.-Y. Zhu, A SM-like Higgs near 125 GeV in low energy SUSY: a comparative study for MSSM and NMSSM, JHEP 03 (2012) 086 [arXiv:1202.5821] [INSPIRE].
J. Cao, Z. Heng, J.M. Yang and J. Zhu, Status of low energy SUSY models confronted with the LHC 125 GeV Higgs data, JHEP 10 (2012) 079 [arXiv:1207.3698] [INSPIRE].
CMS collaboration, Search for supersymmetry using razor variables in events with b-jets in pp collisions at 8 TeV, Phys. Rev. D 91 (2015) 052018 arXiv:1502.00300 [INSPIRE].
CMS collaboration, Search for Supersymmetry in pp collisions at 8 TeV in events with a single lepton, multiple jets and b-tags, CMS-PAS-SUS-13-007.
ATLAS collaboration, Search for new phenomena using final states with large jet multiplicities and missing transverse momentum with ATLAS in 20 fb −1 of \( \sqrt{s}=8 \) TeV proton-proton collisions, ATLAS-CONF-2013-054, ATLAS-COM-CONF-2013-060.
ATLAS collaboration, Search for strong production of supersymmetric particles in final states with missing transverse momentum and at least three b-jets using 20.1 fb −1 of pp collisions at sqrt(s) = 8 TeV with the ATLAS Detector, JHEP 10 (2014) 024 [arXiv:1407.0600] [INSPIRE].
D.M. Ghilencea, H.M. Lee and M. Park, Tuning supersymmetric models at the LHC: A comparative analysis at two-loop level, JHEP 07 (2012) 046 [arXiv:1203.0569] [INSPIRE].
R.L. Arnowitt and P. Nath, Loop corrections to radiative breaking of electroweak symmetry in supersymmetry, Phys. Rev. D 46 (1992) 3981 [INSPIRE].
S.P. Martin, Non-universal gaugino masses from non-singlet F-terms in non-minimal unified models, Phys. Rev. D 79 (2009) 095019 [arXiv:0903.3568] [INSPIRE].
J.E. Younkin and S.P. Martin, Non-universal gaugino masses, the supersymmetric little hierarchy problem and dark matter, Phys. Rev. D 85 (2012) 055028 [arXiv:1201.2989] [INSPIRE].
S. Akula and P. Nath, Gluino-driven radiative breaking, Higgs boson mass, muon g-2 and the Higgs diphoton decay in supergravity unification, Phys. Rev. D 87 (2013) 115022 [arXiv:1304.5526] [INSPIRE].
I. Gogoladze, F. Nasir and Q. Shafi, Non-Universal Gaugino Masses and Natural Supersymmetry, Int. J. Mod. Phys. A 28 (2013) 1350046 [arXiv:1212.2593] [INSPIRE].
C.H. Chen, M. Drees and J.F. Gunion, A Nonstandard string/SUSY scenario and its phenomenological implications, Phys. Rev. D 55 (1997) 330 [Erratum ibid. D 60 (1999) 039901] [hep-ph/9607421] [INSPIRE].
J.F. Gunion and S. Mrenna, A Study of SUSY signatures at the Tevatron in models with near mass degeneracy of the lightest chargino and neutralino, Phys. Rev. D 62 (2000) 015002 [hep-ph/9906270] [INSPIRE].
C.H. Chen, M. Drees and J.F. Gunion, Searching for invisible and almost invisible particles at e + e − colliders, Phys. Rev. Lett. 76 (1996) 2002 [hep-ph/9512230] [INSPIRE].
Q.-H. Cao, C.-R. Chen, C.S. Li and H. Zhang, Effective Dark Matter Model: Relic density, CDMS II, Fermi LAT and LHC, JHEP 08 (2011) 018 [arXiv:0912.4511] [INSPIRE].
M. Beltrán, D. Hooper, E.W. Kolb, Z.A.C. Krusberg and T.M.P. Tait, Maverick dark matter at colliders, JHEP 09 (2010) 037 [arXiv:1002.4137] [INSPIRE].
G.F. Giudice, T. Han, K. Wang and L.-T. Wang, Nearly Degenerate Gauginos and Dark Matter at the LHC, Phys. Rev. D 81 (2010) 115011 [arXiv:1004.4902] [INSPIRE].
J. Goodman et al., Constraints on Dark Matter from Colliders, Phys. Rev. D 82 (2010) 116010 [arXiv:1008.1783] [INSPIRE].
A. Rajaraman, W. Shepherd, T.M.P. Tait and A.M. Wijangco, LHC Bounds on Interactions of Dark Matter, Phys. Rev. D 84 (2011) 095013 [arXiv:1108.1196] [INSPIRE].
P.J. Fox, R. Harnik, J. Kopp and Y. Tsai, Missing Energy Signatures of Dark Matter at the LHC, Phys. Rev. D 85 (2012) 056011 [arXiv:1109.4398] [INSPIRE].
C. Han et al., Probing Light Higgsinos in Natural SUSY from Monojet Signals at the LHC, JHEP 02 (2014) 049 [arXiv:1310.4274] [INSPIRE].
P. Schwaller and J. Zurita, Compressed electroweakino spectra at the LHC, JHEP 03 (2014) 060 [arXiv:1312.7350] [INSPIRE].
ATLAS collaboration, Search for dark matter candidates and large extra dimensions in events with a jet and missing transverse momentum with the ATLAS detector, JHEP 04 (2013)075 [arXiv:1210.4491] [INSPIRE].
CMS collaboration, Search for dark matter and large extra dimensions in monojet events in pp collisions at \( \sqrt{s}=7 \) TeV, JHEP 09 (2012) 094 [arXiv:1206.5663] [INSPIRE].
CMS collaboration, Search for dark matter, extra dimensions and unparticles in monojet events in proton-proton collisions at \( \sqrt{s}=8 \) TeV, arXiv:1408.3583 [INSPIRE].
H. Baer, A. Mustafayev and X. Tata, Monojets and mono-photons from light higgsino pair production at LHC14, Phys. Rev. D 89 (2014) 055007 [arXiv:1401.1162] [INSPIRE].
G. Brooijmans et al., Les Houches 2013: Physics at TeV Colliders: New Physics Working Group Report, arXiv:1405.1617 [INSPIRE].
A. Anandakrishnan, L.M. Carpenter and S. Raby, Degenerate gaugino mass region and mono-boson collider signatures, Phys. Rev. D 90 (2014) 055004 [arXiv:1407.1833] [INSPIRE].
S. Gori, S. Jung, L.-T. Wang and J.D. Wells, Prospects for Electroweakino Discovery at a 100 TeV Hadron Collider, JHEP 12 (2014) 108 [arXiv:1410.6287] [INSPIRE].
K. Rolbiecki and K. Sakurai, Constraining compressed supersymmetry using leptonic signatures, JHEP 10 (2012) 071 [arXiv:1206.6767] [INSPIRE].
S. Gori, S. Jung and L.-T. Wang, Cornering electroweakinos at the LHC, JHEP 10 (2013) 191 [arXiv:1307.5952] [INSPIRE].
M. Berggren et al., Electroweakino Searches: A Comparative Study for LHC and ILC (A Snowmass White Paper), arXiv:1309.7342 [INSPIRE].
T. Han, S. Padhi and S. Su, Electroweakinos in the Light of the Higgs Boson, Phys. Rev. D 88 (2013) 115010 [arXiv:1309.5966] [INSPIRE].
K.-i. Hikasa, T. Liu, L. Wang and J.M. Yang, Pseudo-goldstino and electroweak gauginos at the LHC, JHEP 07 (2014) 065 [arXiv:1403.5731] [INSPIRE].
T. Han, Z. Liu and S. Su, Light Neutralino Dark Matter: Direct/Indirect Detection and Collider Searches, JHEP 08 (2014) 093 [arXiv:1406.1181] [INSPIRE].
G. Barenboim, E.J. Chun, S. Jung and W.I. Park, Implications of an axino LSP for naturalness, Phys. Rev. D 90 (2014) 035020 [arXiv:1407.1218] [INSPIRE].
J. Bramante, A. Delgado, F. Elahi, A. Martin and B. Ostdiek, Catching sparks from well-forged neutralinos, Phys. Rev. D 90 (2014) 095008 [arXiv:1408.6530] [INSPIRE].
C. Han, L. Wu, J.M. Yang, M. Zhang and Y. Zhang, New approach for detecting a compressed bino/wino at the LHC, Phys. Rev. D 91 (2015) 055030 [arXiv:1409.4533] [INSPIRE].
T.A.W. Martin and D. Morrissey, Electroweakino constraints from LHC data, JHEP 12 (2014) 168 [arXiv:1409.6322] [INSPIRE].
C. Han, Probing light bino and higgsinos at the LHC, arXiv:1409.7000 [INSPIRE].
T. Liu, L. Wang and J.M. Yang, Pseudo-goldstino and electroweakinos via VBF processes at LHC, JHEP 02 (2015) 177 [arXiv:1411.6105] [INSPIRE].
Z. Han and Y. Liu, MT2 to the Rescue - Searching for Sleptons in Compressed Spectra at the LHC, arXiv:1412.0618 [INSPIRE].
J. Bramante et al., Relic neutralino surface at a 100 TeV collider, Phys. Rev. D 91 (2015) 054015 [arXiv:1412.4789] [INSPIRE].
A. Barr and J. Scoville, A boost for the EW SUSY hunt: monojet-like search for compressed sleptons at LHC14 with 100 fb −1, arXiv:1501.02511 [INSPIRE].
Z. Han, G.D. Kribs, A. Martin and A. Menon, Hunting quasidegenerate Higgsinos, Phys. Rev. D 89 (2014) 075007 [arXiv:1401.1235] [INSPIRE].
H. Baer, A. Mustafayev and X. Tata, Monojet plus soft dilepton signal from light higgsino pair production at LHC14, Phys. Rev. D 90 (2014) 115007 [arXiv:1409.7058] [INSPIRE].
C. Brust, A. Katz, S. Lawrence and R. Sundrum, SUSY, the Third Generation and the LHC, JHEP 03 (2012) 103 [arXiv:1110.6670] [INSPIRE].
M. Papucci, J.T. Ruderman and A. Weiler, Natural SUSY Endures, JHEP 09 (2012) 035 [arXiv:1110.6926] [INSPIRE].
L.J. Hall, D. Pinner and J.T. Ruderman, A Natural SUSY Higgs Near 126 GeV, JHEP 04 (2012) 131 [arXiv:1112.2703] [INSPIRE].
J.L. Feng and D. Sanford, A Natural 125 GeV Higgs Boson in the MSSM from Focus Point Supersymmetry with A-Terms, Phys. Rev. D 86 (2012) 055015 [arXiv:1205.2372] [INSPIRE].
J. Cao, C. Han, L. Wu, J.M. Yang and Y. Zhang, Probing Natural SUSY from Stop Pair Production at the LHC, JHEP 11 (2012) 039 [arXiv:1206.3865] [INSPIRE].
H. Baer, V. Barger, P. Huang, A. Mustafayev and X. Tata, Radiative natural SUSY with a 125 GeV Higgs boson, Phys. Rev. Lett. 109 (2012) 161802 [arXiv:1207.3343] [INSPIRE].
C. Han, F. Wang and J.M. Yang, Natural SUSY from SU(5) Orbifold GUT, JHEP 11 (2013) 197 [arXiv:1304.5724] [INSPIRE].
C. Han, K.-i. Hikasa, L. Wu, J.M. Yang and Y. Zhang, Current experimental bounds on stop mass in natural SUSY, JHEP 10 (2013) 216 [arXiv:1308.5307] [INSPIRE].
K. Kowalska and E.M. Sessolo, Natural MSSM after the LHC 8 TeV run, Phys. Rev. D 88 (2013) 075001 [arXiv:1307.5790] [INSPIRE].
A. Djouadi, M.M. Muhlleitner and M. Spira, Decays of supersymmetric particles: The Program SUSY-HIT (SUspect-SdecaY-HDECAY-InTerface), Acta Phys. Polon. B 38 (2007) 635 [hep-ph/0609292] [INSPIRE].
XENON1T collaboration, E. Aprile, The XENON1T Dark Matter Search Experiment, Springer Proc. Phys. C12-02-22 (2013) 93 [arXiv:1206.6288] [INSPIRE].
CMS collaboration, Search for disappearing tracks in proton-proton collisions at \( \sqrt{s}=8 \) TeV, JHEP 01 (2015) 096 [arXiv:1411.6006] [INSPIRE].
N. Arkani-Hamed and N. Weiner, LHC Signals for a SuperUnified Theory of Dark Matter, JHEP 12 (2008) 104 [arXiv:0810.0714] [INSPIRE].
N. Arkani-Hamed, D.P. Finkbeiner, T.R. Slatyer and N. Weiner, A Theory of Dark Matter, Phys. Rev. D 79 (2009) 015014 [arXiv:0810.0713] [INSPIRE].
M. Baumgart, C. Cheung, J.T. Ruderman, L.-T. Wang and I. Yavin, Non-Abelian Dark Sectors and Their Collider Signatures, JHEP 04 (2009) 014 [arXiv:0901.0283] [INSPIRE].
A. Katz and R. Sundrum, Breaking the Dark Force, JHEP 06 (2009) 003 [arXiv:0902.3271] [INSPIRE].
C. Cheung, J.T. Ruderman, L.-T. Wang and I. Yavin, Lepton Jets in (Supersymmetric) Electroweak Processes, JHEP 04 (2010) 116 [arXiv:0909.0290] [INSPIRE].
A. Falkowski, J.T. Ruderman, T. Volansky and J. Zupan, Hidden Higgs Decaying to Lepton Jets, JHEP 05 (2010) 077 [arXiv:1002.2952] [INSPIRE].
CMS collaboration, Search for a non-standard-model Higgs boson decaying to a pair of new light bosons in four-muon final states, Phys. Lett. B 726 (2013) 564 [arXiv:1210.7619] [INSPIRE].
CMS collaboration, Search for Light Resonances Decaying into Pairs of Muons as a Signal of New Physics, JHEP 07 (2011) 098 [arXiv:1106.2375] [INSPIRE].
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 Physics and Manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
DELPHES 3 collaboration, J. de Favereau et al., DELPHES 3, A modular framework for fast simulation of a generic collider experiment, JHEP 02 (2014) 057 [arXiv:1307.6346] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, FastJet User Manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, The Anti-k(t) jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [INSPIRE].
A. Denner, S. Dittmaier, T. Kasprzik and A. Mück, Electroweak corrections to monojet production at the LHC, Eur. Phys. J. C 73 (2013) 2297 [arXiv:1211.5078] [INSPIRE].
F. Caravaglios, M.L. Mangano, M. Moretti and R. Pittau, A New approach to multijet calculations in hadron collisions, Nucl. Phys. B 539 (1999) 215 [hep-ph/9807570] [INSPIRE].
ATLAS collaboration, Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, Phys. Rev. D 90 (2014) 052008 [arXiv:1407.0608] [INSPIRE].
G.F. Giudice, B. Gripaios and R. Mahbubani, Counting dark matter particles in LHC events, Phys. Rev. D 85 (2012) 075019 [arXiv:1108.1800] [INSPIRE].
ATLAS collaboration, A search for prompt lepton-jets in pp collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, Phys. Lett. B 719 (2013) 299 [arXiv:1212.5409] [INSPIRE].
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Han, C., Kim, D., Munir, S. et al. Accessing the core of naturalness, nearly degenerate higgsinos, at the LHC. J. High Energ. Phys. 2015, 132 (2015). https://doi.org/10.1007/JHEP04(2015)132
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DOI: https://doi.org/10.1007/JHEP04(2015)132