Abstract
Recently the ATLAS collaboration reported a 3σ excess in the search for the events containing a dilepton pair from a Z boson and large missing transverse energy. Although the excess is not sufficiently significant yet, it is quite tempting to explain this excess by a well-motivated model beyond the standard model. In this paper we study a possibility of the minimal supersymmetric standard model (MSSM) for this excess. Especially, we focus on the MSSM spectrum where the sfermions are heavier than the gauginos and Higgsinos. We show that the excess can be explained by the reasonable MSSM mass spectrum.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
ATLAS collaboration, Search for supersymmetry in events containing a same-flavour opposite-sign dilepton pair, jets and large missing transverse momentum in \( \sqrt{s}=8 \) TeV pp collisions with the ATLAS detector, Eur. Phys. J. C 75 (2015) 318 [arXiv:1503.03290] [INSPIRE].
CMS collaboration, Search for physics beyond the standard model in events with two leptons, jets and missing transverse momentum in pp collisions at \( \sqrt{s}=8 \) TeV, JHEP 04 (2015) 124 [arXiv:1502.06031] [INSPIRE].
G. Barenboim et al., METing SUSY on the Z peak, arXiv:1503.04184 [INSPIRE].
ATLAS collaboration, Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using \( \sqrt{s}=8 \) TeV proton-proton collision data, JHEP 09 (2014) 176 [arXiv:1405.7875] [INSPIRE].
M. Cahill-Rowley, J.L. Hewett, A. Ismail and T.G. Rizzo, The ATLAS Z + MET excess in the MSSM, arXiv:1506.05799 [INSPIRE].
P. Meade, N. Seiberg and D. Shih, General gauge mediation, Prog. Theor. Phys. Suppl. 177 (2009) 143 [arXiv:0801.3278] [INSPIRE].
M. Buican, P. Meade, N. Seiberg and D. Shih, Exploring general gauge mediation, JHEP 03 (2009) 016 [arXiv:0812.3668] [INSPIRE].
ATLAS collaboration, Search for direct top-squark pair production in final states with two leptons in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 06 (2014) 124 [arXiv:1403.4853] [INSPIRE].
ATLAS collaboration, Search for supersymmetry in events with four or more leptons in \( \sqrt{s}=8 \) TeV pp collisions with the ATLAS detector, Phys. Rev. D 90 (2014) 052001 [arXiv:1405.5086] [INSPIRE].
CMS collaboration, Search for anomalous production of events with three or more leptons in pp collisions at \( \sqrt{s}=8 \) TeV, Phys. Rev. D 90 (2014) 032006 [arXiv:1404.5801] [INSPIRE].
B. Allanach, A. Raklev and A. Kvellestad, Consistency of the recent ATLAS Z + E miss T excess in a simplified GGM model, Phys. Rev. D 91 (2015) 095016 [arXiv:1504.02752] [INSPIRE].
U. Ellwanger, Possible explanation of excess events in the search for jets, missing transverse momentum and a Z boson in pp collisions, Eur. Phys. J. C 75 (2015) 367 [arXiv:1504.02244] [INSPIRE].
A. Kobakhidze, A. Saavedra, L. Wu and J.M. Yang, ATLAS Z-peaked excess in MSSM with a light sbottom or stop, arXiv:1504.04390 [INSPIRE].
J. Cao, L. Shang, J.M. Yang and Y. Zhang, Explanation of the ATLAS Z-Peaked excess in the NMSSM, JHEP 06 (2015) 152 [arXiv:1504.07869] [INSPIRE].
ATLAS collaboration, Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at \( \sqrt{s}=8 \) TeV proton-proton collisions using the ATLAS experiment, JHEP 10 (2013) 130 [Erratum ibid. 1401 (2014) 109] [arXiv:1308.1841] [INSPIRE].
N. Vignaroli, Z-peaked excess from heavy gluon decays to vectorlike quarks, Phys. Rev. D 91 (2015) 115009 [arXiv:1504.01768] [INSPIRE].
D.B. Kaplan and H. Georgi, SU(2) × U(1) breaking by vacuum misalignment, Phys. Lett. B 136 (1984) 183.
L. Randall and R. Sundrum, A large mass hierarchy from a small extra dimension, Phys. Rev. Lett. 83 (1999) 3370 [hep-ph/9905221] [INSPIRE].
ATLAS collaboration, Search for strong production of supersymmetric particles in final states with missing transverse momentum and at least three b-jets at \( \sqrt{s}=8 \) TeV proton-proton collisions with the ATLAS detector, JHEP 10 (2014) 24 [arXiv:1407.0600] [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].
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].
J.D. Wells, Implications of supersymmetry breaking with a little hierarchy between gauginos and scalars, hep-ph/0306127 [INSPIRE].
J.D. Wells, PeV-scale supersymmetry, Phys. Rev. D 71 (2005) 015013 [hep-ph/0411041] [INSPIRE].
N. Arkani-Hamed and S. Dimopoulos, Supersymmetric unification without low energy supersymmetry and signatures for fine-tuning at the LHC, JHEP 06 (2005) 073 [hep-th/0405159] [INSPIRE].
G.F. Giudice and A. Romanino, Split supersymmetry, Nucl. Phys. B 699 (2004) 65 [Erratum ibid. B 706 (2005) 65] [hep-ph/0406088] [INSPIRE].
N. Arkani-Hamed, S. Dimopoulos, G.F. Giudice and A. Romanino, Aspects of split supersymmetry, Nucl. Phys. B 709 (2005) 3 [hep-ph/0409232] [INSPIRE].
N. Arkani-Hamed, S. Dimopoulos and S. Kachru, Predictive landscapes and new physics at a TeV, hep-th/0501082 [INSPIRE].
Y. Okada et al., Upper bound of the lightest Higgs boson mass in the minimal supersymmetric standard model, Prog. Theor. Phys. 85 (1991) 1.
Y. Okada et al., Renormalization-group analysis on the Higgs mass in the softly-broken supersymmetric standard model, Phys. Lett. B 262 (1991) 54.
J.R. Ellis et al., Radiative corrections to the masses of supersymmetric Higgs bosons, Phys. Lett. B 257 (1991) 83.
H.E. Haber and R. Hempfling, Can the mass of the lightest Higgs boson of the minimal supersymmetric model be larger than m Z ?, Phys. Rev. Lett 86 (1991) 1815.
J.R. Ellis et al., On radiative corrections to supersymmetric Higgs boson masses and their implications for LEP searches, Phys. Lett. B 262 (1991) 477.
G.F. Giudice and A. Strumia, Probing high-scale and split supersymmetry with Higgs mass measurements, Nucl. Phys. B 858 (2012) 63 [arXiv:1108.6077] [INSPIRE].
L.J. Hall and Y. Nomura, Spread supersymmetry, JHEP 01 (2012) 082 [arXiv:1111.4519] [INSPIRE].
L.J. Hall, Y. Nomura and S. Shirai, Spread supersymmetry with Wino LSP: gluino and dark matter signals, JHEP 01 (2013) 036 [arXiv:1210.2395] [INSPIRE].
Y. Nomura and S. Shirai, Supersymmetry from typicality: TeV-scale gauginos and PeV-scale squarks and sleptons, Phys. Rev. Lett. 113 (2014) 111801 [arXiv:1407.3785] [INSPIRE].
M. Ibe and T.T. Yanagida, The lightest Higgs boson mass in pure gravity mediation model, Phys. Lett. B 709 (2012) 374 [arXiv:1112.2462] [INSPIRE].
M. Ibe, S. Matsumoto and T.T. Yanagida, Pure gravity mediation with m 3/2 = 10-100 TeV, Phys. Rev. D 85 (2012) 095011 [arXiv:1202.2253] [INSPIRE].
A. Arvanitaki, N. Craig, S. Dimopoulos and G. Villadoro, Mini-split, JHEP 02 (2013) 126 [arXiv:1210.0555] [INSPIRE].
N. Arkani-Hamed, A. Gupta, D.E. Kaplan, N. Weiner and T. Zorawski, Simply unnatural supersymmetry, arXiv:1212.6971 [INSPIRE].
M. Toharia and J.D. Wells, Gluino decays with heavier scalar superpartners, JHEP 02 (2006) 015 [hep-ph/0503175] [INSPIRE].
P. Gambino, G.F. Giudice and P. Slavich, Gluino decays in split supersymmetry, Nucl. Phys. B 726 (2005) 35 [hep-ph/0506214] [INSPIRE].
R. Sato, S. Shirai and K. Tobioka, Gluino decay as a probe of high scale supersymmetry breaking, JHEP 11 (2012) 041 [arXiv:1207.3608] [INSPIRE].
R. Sato, S. Shirai and K. Tobioka, Flavor of gluino decay in high-scale supersymmetry, JHEP 10 (2013) 157 [arXiv:1307.7144] [INSPIRE].
D. Buttazzo et al., Investigating the near-criticality of the Higgs boson, JHEP 12 (2013) 089 [arXiv:1307.3536] [INSPIRE].
N. Nagata, H. Otono and S. Shirai, Probing bino-gluino coannihilation at the LHC, Phys. Lett. B 748 (2015) 24 [arXiv:1504.00504] [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].
J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: going beyond, JHEP 06 (2011) 128 [arXiv:1106.0522] [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 and G.P. Salam, Dispelling the N 3 myth for the k t jet-finder, Phys. Lett. B 641 (2006) 57 [hep-ph/0512210] [INSPIRE].
J. Alwall et al., Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions, Eur. Phys. J. C 53 (2008) 473 [arXiv:0706.2569] [INSPIRE].
J. Pumplin, D.R. Stump, J. Huston, H.L. Lai, P.M. Nadolsky and W.K. Tung, New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [INSPIRE].
W. Beenakker, R. Hopker, M. Spira and P.M. Zerwas, Squark and gluino production at hadron colliders, Nucl. Phys. B 492 (1997) 51 [hep-ph/9610490] [INSPIRE].
A. Kulesza and L. Motyka, Threshold resummation for squark-antisquark and gluino-pair production at the LHC, Phys. Rev. Lett. 102 (2009) 111802 [arXiv:0807.2405] [INSPIRE].
A. Kulesza and L. Motyka, Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC, Phys. Rev. D 80 (2009) 095004 [arXiv:0905.4749] [INSPIRE].
W. Beenakker, S. Brensing, M. Krämer, A. Kulesza, E. Laenen and I. Niessen, Soft-gluon resummation for squark and gluino hadroproduction, JHEP 12 (2009) 041 [arXiv:0909.4418] [INSPIRE].
W. Beenakker et al., Squark and gluino hadroproduction, Int. J. Mod. Phys. A 26 (2011) 2637 [arXiv:1105.1110] [INSPIRE].
CMS collaboration, Searches for electroweak production of charginos, neutralinos and sleptons decaying to leptons and W , Z and Higgs bosons in pp collisions at 8 TeV, Eur. Phys. J. C 74 (2014) 3036 [arXiv:1405.7570] [INSPIRE].
ATLAS collaboration, Search for direct production of charginos, neutralinos and sleptons in final states with two leptons and missing transverse momentum in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 05 (2014) 071 [arXiv:1403.5294] [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1506.07161
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
About this article
Cite this article
Lu, X., Shirai, S. & Terada, T. ATLAS Z excess in minimal supersymmetric standard model. J. High Energ. Phys. 2015, 204 (2015). https://doi.org/10.1007/JHEP09(2015)204
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP09(2015)204