Abstract
The LHC, with its seven-fold increase in energy over the Tevatron, is capable of probing regions of SUSY parameter space exhibiting qualitatively new collider phenomenology. Here we investigate one such region in which first generation squarks are very heavy compared to the other superpartners. We find that the production of these squarks, which is dominantly associative, only becomes rate-limited at \( {m_{\tilde{q}}} \gtrsim 4(5)\;{\text{TeV}} \) for \( \mathcal{L}\sim 10\left( {100} \right)\;{\text{f}}{{\text{b}}^{ - 1}} \). However, discovery of this scenario is complicated because heavy squarks decay primarily into a jet and boosted gluino, yielding a dijet-like topology with missing energy (MET) pointing along the direction of the second hardest jet. The result is that many signal events are removed by standard jet/MET anti-alignment cuts designed to guard against jet mismeasurement errors. We suggest replacing these anti-alignment cuts with a measurement of jet substructure that can significantly extend the reach of this channel while still removing much of the background. We study a selection of benchmark points in detail, demonstrating that \( {m_{\tilde{q}}} = 4(5) \ {\rm TeV}\) first generation squarks can be discovered at the LHC with \( \mathcal{L}\sim 10\left( {100} \right)\;{\text{f}}{{\text{b}}^{ - 1}} \).
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
A.H. Chamseddine, R.L. Arnowitt and P. Nath, Locally supersymmetric grand unification, Phys. Rev. Lett. 49 (1982) 970 [SPIRES].
B.C. Allanach et al., The Snowmass points and slopes: Benchmarks for SUSY searches, Eur. Phys. J. C 25 (2002) 113 [hep-ph/0202233] [SPIRES].
C.F. Berger, J.S. Gainer, J.L. Hewett and T.G. Rizzo, Supersymmetry without prejudice, JHEP 02 (2009) 023 [arXiv:0812.0980] [SPIRES].
J.A. Conley, J.S. Gainer, J.L. Hewett, M.P. Le and T.G. Rizzo, Supersymmetry without prejudice at the LHC, arXiv:1009.2539 [SPIRES].
R. Barbieri, G.R. Dvali and L.J. Hall, Predictions from a U(2) flavour symmetry in supersymmetric theories, Phys. Lett. B 377 (1996) 76 [hep-ph/9512388] [SPIRES].
A.G. Cohen, D.B. Kaplan and A.E. Nelson, The more minimal supersymmetric standard model, Phys. Lett. B 388 (1996) 588 [hep-ph/9607394] [SPIRES].
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] [SPIRES].
G.F. Giudice and A. Romanino, Split supersymmetry, Nucl. Phys. B 699 (2004) 65 [hep-ph/0406088] [SPIRES].
N. Arkani-Hamed, S. Dimopoulos, G.F. Giudice and A. Romanino, A spects of split supersymmetry, Nucl. Phys. B 709 (2005) 3 [hep-ph/0409232] [SPIRES].
J.D. Wells, PeV-scale supersymmetry, Phys. Rev. D 71 (2005) 015013 [hep-ph/0411041] [SPIRES].
S. Franco and S. Kachru, Single-sector supersymmetry breaking in supersymmetric QCD, Phys. Rev. D 81 (2010) 095020 [arXiv:0907.2689] [SPIRES].
N. Craig, R. Essig, S. Franco, S. Kachru and G. Torroba, Dynamical supersymmetry breaking, with flavor, Phys. Rev. D 81 (2010) 075015 [arXiv:0911.2467] [SPIRES].
D0 collaboration, V.M. Abazov et al., Search for squarks and gluinos in events with jets and missing transverse energy using 2.1 fb −1 of \( p\bar{p} \) collision data at \( \sqrt {s} = 1.96\;TeV \), Phys. Lett. B 660 (2008) 449 [arXiv:0712.3805] [SPIRES].
CMS collaboration, G.L. Bayatian et al., CMS technical design report, volume II: physics performance, J. Phys. G 34 (2007) 995 [SPIRES].
A. Abdesselam et al., Boosted objects: a probe of beyond the standard model physics, arXiv:1012.5412 [SPIRES].
G.P. Salam, Towards jetography, Eur. Phys. J. C 67 (2010) 637 [arXiv:0906.1833] [SPIRES].
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] [SPIRES].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [SPIRES].
ATLAS collaboration, ATLAS detector and physics performance: technical design report 2, CERN-LHCC-99-015 (1999).
M. Toharia and J.D. Wells, Gluino decays with heavier scalar superpartners, JHEP 02 (2006) 015 [hep-ph/0503175] [SPIRES].
P. Gambino, G.F. Giudice and P. Slavich, Gluino decays in split supersymmetry, Nucl. Phys. B 726 (2005) 35 [hep-ph/0506214] [SPIRES].
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] [SPIRES].
ATLAS collaboration, Reconstruction of high mass \( t\bar{t} \) resonances in the lepton+jets channel, ATL-COM-PHYS-2009-255 (2009).
B. Lillie, L. Randall and L.-T. Wang, The bulk RS KK-gluon at the LHC, JHEP 09 (2007) 074 [hep-ph/0701166] [SPIRES].
L. Randall and D. Tucker-Smith, Dijet searches for supersymmetry at the LHC, Phys. Rev. Lett. 101 (2008) 221803 [arXiv:0806.1049] [SPIRES].
M. Rubin, G.P. Salam and S. Sapeta, Giant QCD K-factors beyond NLO, JHEP 09 (2010) 084 [arXiv:1006.2144] [SPIRES].
K. Rehermann and B. Tweedie, Efficient identification of boosted semileptonic top quarks at the LHC, arXiv:1007.2221 [SPIRES].
J. Alwall et al., MadGraph/MadEvent v4: the new web generation, JHEP 09 (2007) 028 [arXiv:0706.2334] [SPIRES].
S. Hoeche et al., Matching parton showers and matrix elements, hep-ph/0602031 [SPIRES].
T. Gleisberg et al., Event generation with SHERPA 1.1, JHEP 02 (2009) 007 [arXiv:0811.4622] [SPIRES].
S. Catani, F. Krauss, R. Kuhn and B.R. Webber, QCD matrix elements + parton showers, JHEP 11 (2001) 063 [hep-ph/0109231] [SPIRES].
M. Cacciari, G. Salam and G. Soyez, FastJet, http://fastjet.fr/.
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] [SPIRES].
M. Cacciari, G.P. Salam and G. Soyez, The anti-k t jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [SPIRES].
M.H. Seymour, Searches for new particles using cone and cluster jet algorithms: a comparative study, Z. Phys. C 62 (1994) 127 [SPIRES].
J.M. Butterworth, B.E. Cox and J.R. Forshaw, WW scattering at the CERN LHC, Phys. Rev. D 65 (2002) 096014 [hep-ph/0201098] [SPIRES].
J.M. Butterworth, J.R. Ellis and A.R. Raklev, Reconstructing sparticle mass spectra using hadronic decays, JHEP 05 (2007) 033 [hep-ph/0702150] [SPIRES].
Y. Cui, Z. Han and M.D. Schwartz, W-jet tagging: optimizing the identification of boosted hadronically-decaying W bosons, arXiv:1012.2077
M.H. Seymour, Searches for new particles using cone and cluster jet algorithms: a comparative study, Z. Phys. C 62 (1994) 127 [SPIRES].
J.M. Butterworth, A.R. Davison, M. Rubin and G.P. Salam, Jet substructure as a new Higgs search channel at the LHC, Phys. Rev. Lett. 100 (2008) 242001 [arXiv:0802.2470] [SPIRES].
G.D. Kribs, A. Martin, T.S. Roy and M. Spannowsky, Discovering the Higgs boson in new physics events using jet substructure, Phys. Rev. D 81 (2010) 111501 [arXiv:0912.4731] [SPIRES].
C. Hackstein and M. Spannowsky, Boosting Higgs discovery — The forgotten channel, Phys. Rev. D 82 (2010) 113012 [arXiv:1008.2202] [SPIRES].
G.D. Kribs, A. Martin, T.S. Roy and M. Spannowsky, Discovering Higgs bosons of the MSSM using jet substructure, Phys. Rev. D 82 (2010) 095012 [arXiv:1006.1656] [SPIRES].
T. Plehn, G.P. Salam and M. Spannowsky, Fat jets for a light Higgs, Phys. Rev. Lett. 104 (2010) 111801 [arXiv:0910.5472] [SPIRES].
G.D. Kribs, A. Martin and T.S. Roy, Higgs discovery through top-partners using jet substructure, arXiv:1012.2866 [SPIRES].
D.E. Kaplan, K. Rehermann, M.D. Schwartz and B. Tweedie, Top tagging: a method for identifying boosted hadronically decaying top quarks, Phys. Rev. Lett. 101 (2008) 142001 [arXiv:0806.0848] [SPIRES].
J. Thaler and L.-T. Wang, Strategies to identify boosted tops, JHEP 07 (2008) 092 [arXiv:0806.0023] [SPIRES].
L.G. Almeida et al., Substructure of high-p T jets at the LHC, Phys. Rev. D 79 (2009) 074017 [arXiv:0807.0234] [SPIRES].
L.G. Almeida, S.J. Lee, G. Perez, I. Sung and J. Virzi, Top jets at the LHC, Phys. Rev. D 79 (2009) 074012 [arXiv:0810.0934] [SPIRES].
S.D. Ellis, C.K. Vermilion and J.R. Walsh, Techniques for improved heavy particle searches with jet substructure, Phys. Rev. D 80 (2009) 051501 [arXiv:0903.5081] [SPIRES].
S.D. Ellis, C.K. Vermilion and J.R. Walsh, Recombination algorithms and jet substructure: pruning as a tool for heavy particle searches, Phys. Rev. D 81 (2010) 094023 [arXiv:0912.0033] [SPIRES].
L.G. Almeida, S.J. Lee, G. Perez, G. Sterman and I. Sung, Template overlap method for massive jets, Phys. Rev. D 82 (2010) 054034 [arXiv:1006.2035] [SPIRES].
D. Krohn, J. Shelton and L.-T. Wang, Measuring the polarization of boosted hadronic tops, JHEP 07 (2010) 041 [arXiv:0909.3855] [SPIRES].
T. Plehn, M. Spannowsky, M. Takeuchi and D. Zerwas, Stop reconstruction with tagged tops, JHEP 10 (2010) 078 [arXiv:1006.2833] [SPIRES].
J.M. Butterworth, J.R. Ellis, A.R. Raklev and G.P. Salam, Discovering baryon-number iolating neutralino decays at the LHC, Phys. Rev. Lett. 103 (2009) 241803 [arXiv:0906.0728] [SPIRES].
A. Falkowski, D. Krohn, L.-T. Wang, J. Shelton and A. Thalapillil, Unburied Higgs, arXiv:1006.1650 [SPIRES].
C.-R. Chen, M.M. Nojiri and W. Sreethawong, Search for the elusive Higgs boson using jet structure at LHC, JHEP 11 (2010) 012 [arXiv:1006.1151] [SPIRES].
A. Katz, M. Son and B. Tweedie, Jet substructure and the search for neutral spin-one resonances in electroweak boson channels, JHEP 03 (2011) 011 [arXiv:1010.5253] [SPIRES].
C. Englert, C. Hackstein and M. Spannowsky, Measuring spin and CP from semi-hadronic ZZ decays using jet substructure, Phys. Rev. D 82 (2010) 114024 [arXiv:1010.0676] [SPIRES].
S. Catani, Y.L. Dokshitzer, M.H. Seymour and B.R. Webber, Longitudinally invariant K t clustering algorithms for hadron hadron collisions, Nucl. Phys. B 406 (1993) 187 [SPIRES].
S.D. Ellis and D.E. Soper, Successive combination jet algorithm for hadron collisions, Phys. Rev. D 48 (1993) 3160 [hep-ph/9305266] [SPIRES].
J. Gallicchio et al., Comprehensive multivariate discrimination and the Higgs + W/Z search, arXiv:1010.3698 [SPIRES].
P.E.L. Rakow and B.R. Webber, Transverse momentum moments of hadron distributions in QCD jets, Nucl. Phys. B 191 (1981) 63 [SPIRES].
J. Thaler and K. Van Tilburg, Identifying boosted objects with N-subjettiness, JHEP 03 (2011) 015 [arXiv:1011.2268] [SPIRES].
J.-H. Kim, Rest frame subjet algorithm with SISCone jet for fully hadronic decaying Higgs search, Phys. Rev. D 83 (2011) 011502 [arXiv:1011.1493] [SPIRES].
J.M. Campbell, J.W. Huston and W.J. Stirling, Hard interactions of quarks and gluons: a primer for LHC physics, Rept. Prog. Phys. 70 (2007) 89 [hep-ph/0611148] [SPIRES].
J. Dolen, Jet substructure in pp collisions at 7 TeV in CMS, talk given at the Northwest Terascale Workshop, Oregon, USA (2011).
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1102.0302
Rights and permissions
About this article
Cite this article
Fan, J., Krohn, D., Mosteiro, P. et al. Heavy squarks at the LHC. J. High Energ. Phys. 2011, 77 (2011). https://doi.org/10.1007/JHEP03(2011)077
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP03(2011)077