Abstract
We consider how best to search for top partners in generic composite Higgs models. We begin by classifying the possible group representations carried by top partners in models with and without a custodial SU(2) × SU(2) ⋊ \( \mathbb{Z} \) 2 symmetry protecting the rate for Z → \( b\overline{b} \) decays. We identify a number of minimal models whose top partners only have electric charges of \( \frac{1}{3} \) , \( \frac{2}{3} \) , or \( \frac{4}{3} \) and thus decay to top or bottom quarks via a single Higgs or electroweak gauge boson. We develop an inclusive search for these based on a top veto, which we find to be more effective than existing searches. Less minimal models feature light states that can be sought in final states with like-sign leptons and so we find that 2 straightforward LHC searches give a reasonable coverage of the gamut of composite Higgs models.
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References
D.B. Kaplan and H. Georgi, SU(2) × U(1) Breaking by Vacuum Misalignment, Phys. Lett. B 136 (1984) 183 [INSPIRE].
H. Georgi and D.B. Kaplan, Composite Higgs and Custodial SU(2), Phys. Lett. B 145 (1984) 216 [INSPIRE].
M.J. Dugan, H. Georgi and D.B. Kaplan, Anatomy of a Composite Higgs Model, Nucl. Phys. B 254 (1985) 299 [INSPIRE].
R. Contino, Y. Nomura and A. Pomarol, Higgs as a holographic pseudoGoldstone boson, Nucl. Phys. B 671 (2003) 148 [hep-ph/0306259] [INSPIRE].
K. Agashe, R. Contino and A. Pomarol, The minimal composite Higgs model, Nucl. Phys. B 719 (2005) 165 [hep-ph/0412089] [INSPIRE].
G.F. Giudice, C. Grojean, A. Pomarol and R. Rattazzi, The strongly-interacting light Higgs, JHEP 06 (2007) 045 [hep-ph/0703164] [INSPIRE].
P. Sikivie, L. Susskind, M.B. Voloshin and V.I. Zakharov, Isospin Breaking in Technicolor Models, Nucl. Phys. B 173 (1980) 189 [INSPIRE].
K. Agashe, R. Contino, L. Da Rold and A. Pomarol, A custodial symmetry for Zb \( \overline{b} \), Phys. Lett. B 641 (2006) 62 [hep-ph/0605341] [INSPIRE].
D.B. Kaplan, Flavor at SSC energies: a new mechanism for dynamically generated fermion masses, Nucl. Phys. B 365 (1991) 259 [INSPIRE].
B. Gripaios, A. Pomarol, F. Riva and J. Serra, Beyond the Minimal Composite Higgs Model, JHEP 04 (2009) 070 [arXiv:0902.1483] [INSPIRE].
J. Mrazek et al., The Other Natural Two Higgs Doublet Model, Nucl. Phys. B 853 (2011) 1 [arXiv:1105.5403] [INSPIRE].
A. Falkowski, Pseudo-goldstone Higgs production via gluon fusion, Phys. Rev. D 77 (2008) 055018 [arXiv:0711.0828] [INSPIRE].
I. Low, R. Rattazzi and A. Vichi, Theoretical constraints on the Higgs effective couplings, JHEP 04 (2010) 126 [arXiv:0907.5413] [INSPIRE].
R. Contino, L. Da Rold and A. Pomarol, Light custodians in natural composite Higgs models, Phys. Rev. D 75 (2007) 055014 [hep-ph/0612048] [INSPIRE].
O. Matsedonskyi, G. Panico and A. Wulzer, Light top partners for a light composite Higgs, JHEP 01 (2013) 164 [arXiv:1204.6333] [INSPIRE].
M. Redi and A. Tesi, Implications of a light Higgs in composite models, JHEP 10 (2012) 166 [arXiv:1205.0232] [INSPIRE].
D. Marzocca, M. Serone and J. Shu, General composite Higgs models, JHEP 08 (2012) 013 [arXiv:1205.0770] [INSPIRE].
A. Pomarol and F. Riva, The composite Higgs and light resonance connection, JHEP 08 (2012) 135 [arXiv:1205.6434] [INSPIRE].
G. Panico, M. Redi, A. Tesi and A. Wulzer, On the Tuning and the Mass of the Composite Higgs, JHEP 03 (2013) 051 [arXiv:1210.7114] [INSPIRE].
D. Pappadopulo, A. Thamm and R. Torre, A minimally tuned composite Higgs model from an extra dimension, JHEP 07 (2013) 058 [arXiv:1303.3062] [INSPIRE].
R. Contino and G. Servant, Discovering the top partners at the LHC using same-sign dilepton final states, JHEP 06 (2008) 026 [arXiv:0801.1679] [INSPIRE].
H. de Sandes and R. Rosenfeld, Search for light custodians in a clean decay channel at the LHC, J. Phys. G 36 (2009) 085001 [arXiv:0811.0984] [INSPIRE].
J.A. Aguilar-Saavedra, Identifying top partners at LHC, JHEP 11 (2009) 030 [arXiv:0907.3155] [INSPIRE].
J. Mrazek and A. Wulzer, A Strong Sector at the LHC: Top Partners in Same-Sign Dileptons, Phys. Rev. D 81 (2010) 075006 [arXiv:0909.3977] [INSPIRE].
G. Dissertori, E. Furlan, F. Moortgat and P. Nef, Discovery potential of top-partners in a realistic composite Higgs model with early LHC data, JHEP 09 (2010) 019 [arXiv:1005.4414] [INSPIRE].
S. Gopalakrishna, T. Mandal, S. Mitra and R. Tibrewala, LHC Signatures of a Vector-like b’, Phys. Rev. D 84 (2011) 055001 [arXiv:1107.4306] [INSPIRE].
K. Harigaya, S. Matsumoto, M.M. Nojiri and K. Tobioka, Search for the Top Partner at the LHC using Multi-b-Jet Channels, Phys. Rev. D 86 (2012) 015005 [arXiv:1204.2317] [INSPIRE].
N. Vignaroli, Early discovery of top partners and test of the Higgs nature, Phys. Rev. D 86 (2012) 075017 [arXiv:1207.0830] [INSPIRE].
A. De Simone, O. Matsedonskyi, R. Rattazzi and A. Wulzer, A First Top Partner Hunter’s Guide, JHEP 04 (2013) 004 [arXiv:1211.5663] [INSPIRE].
S. Gopalakrishna, T. Mandal, S. Mitra and G. Moreau, LHC Signatures of Warped-space Vectorlike Quarks, JHEP 08 (2014) 079 [arXiv:1306.2656] [INSPIRE].
A. Banfi, A. Martin and V. Sanz, Probing top-partners in Higgs+jets, JHEP 08 (2014) 053 [arXiv:1308.4771] [INSPIRE].
A. Azatov, M. Salvarezza, M. Son and M. Spannowsky, Boosting Top Partner Searches in Composite Higgs Models, Phys. Rev. D 89 (2014) 075001 [arXiv:1308.6601] [INSPIRE].
M. Gillioz, R. Gröber, A. Kapuvari and M. Mühlleitner, Vector-like Bottom Quarks in Composite Higgs Models, JHEP 03 (2014) 037 [arXiv:1311.4453] [INSPIRE].
O. Matsedonskyi, F. Riva and T. Vantalon, Composite Charge 8/3 Resonances at the LHC, JHEP 04 (2014) 059 [arXiv:1401.3740] [INSPIRE].
S. Beauceron, G. Cacciapaglia, A. Deandrea and J.D. Ruiz-Alvarez, Fully hadronic decays of a singly produced vector-like top partner at the LHC, arXiv:1401.5979 [INSPIRE].
N.G. Ortiz, J. Ferrando, D. Kar and M. Spannowsky, Reconstructing singly produced top partners in decays to Wb, arXiv:1403.7490 [INSPIRE].
D. Barducci et al., Model Independent Framework for Analysis of Scenarios with Multiple Heavy Extra Quarks, arXiv:1405.0737 [INSPIRE].
M. Endo, K. Hamaguchi, K. Ishikawa and M. Stoll, Reconstruction of Vector-like Top Partner from Fully Hadronic Final States, arXiv:1405.2677 [INSPIRE].
B. Gripaios, Composite Leptoquarks at the LHC, JHEP 02 (2010) 045 [arXiv:0910.1789] [INSPIRE].
B. Gripaios, A. Papaefstathiou, K. Sakurai and B. Webber, Searching for third-generation composite leptoquarks at the LHC, JHEP 01 (2011) 156 [arXiv:1010.3962] [INSPIRE].
S.R. Coleman, J. Wess and B. Zumino, Structure of phenomenological Lagrangians. 1., Phys. Rev. 177 (1969) 2239 [INSPIRE].
CMS collaboration, Search for top-quark partners with charge 5/3 in the same-sign dilepton final state, Phys. Rev. Lett. 112 (2014) 171801 [arXiv:1312.2391] [INSPIRE].
ATLAS collaboration, Search for anomalous production of events with same-sign dileptons and b jets in 14.3 fb −1 of pp collisions at \( \sqrt{s} \) = 8 TeV with the ATLAS detector, ATLAS-CONF-2013-051 (2013).
A. Alloul, N.D. Christensen, C. Degrande, C. Duhr and B. Fuks, FeynRules 2.0 — A complete toolbox for tree-level phenomenology, Comput. Phys. Commun. 185 (2014) 2250 [arXiv:1310.1921] [INSPIRE].
F. Maltoni and T. Stelzer, MadEvent: automatic event generation with MadGraph, JHEP 02 (2003) 027 [hep-ph/0208156] [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].
A.L. Read, Presentation of search results: The CL s technique, J. Phys. G 28 (2002) 2693 [INSPIRE].
ATLAS collaboration, Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in \( \sqrt{s} \) = 8 TeV pp collisions with the ATLAS detector, JHEP 10 (2013) 189 [arXiv:1308.2631] [INSPIRE].
ATLAS collaboration, Search for direct top squark pair production in final states with one isolated lepton, jets and missing transverse momentum in sqrts = 8, TeV pp collisions using 21 fb −1 of ATLAS data, ATLAS-CONF-2013-037 (2013).
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).
CMS collaboration, Inclusive search for a vector-like T quark with charge \( \frac{2}{3} \) in pp collisions at \( \sqrt{s} \) = 8 TeV, Phys. Lett. B 729 (2014) 149 [arXiv:1311.7667] [INSPIRE].
ATLAS collaboration, Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state in pp collisions at \( \sqrt{s} \) = 8 TeV with the ATLAS detector, ATLAS-CONF-2013-060 (2013).
CMS Collaboration, Search for Vector-Like b’ Pair Production with Multilepton Final States in pp collisions at \( \sqrt{s} \) = 8 TeV, CMS-PAS-B2G-13-003 (2013).
T. Broecker and T. tom Dieck, Representations of Compact Lie Groups, Springer, Berlin Germany (1985).
N. Kemmer, D.L. Pursey and S.A. Williams, Irreducible representations of the fivedimensional rotation group. I, J. Math. Phys. 9 (1968) 1224.
S. Helgason, Graduate Studies in Mathematics. Vol. 34: Differential Geometry, Lie Groups, and Symmetric Spaces, American Mathematical Society, Providence U.S.A. (2001).
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Gripaios, B., Müller, T., Parker, M.A. et al. Search strategies for top partners in composite Higgs models. J. High Energ. Phys. 2014, 171 (2014). https://doi.org/10.1007/JHEP08(2014)171
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DOI: https://doi.org/10.1007/JHEP08(2014)171