Abstract
We study the phenomenology of vector resonances in the context of natural composite Higgs models. A mild hierarchy between the fermionic partners and the vector resonances can be expected in these models based on the following arguments. Both direct and indirect (electroweak and flavor precision) constraints on fermionic partners are milder than the ones on spin one resonances. Also the naturalness pressure coming from the top partners is stronger than that induced by the gauge partners. This observation implies that the search strategy for vector resonances at the LHC needs to be modified. In particular, we point out the importance of heavy gluon decays (or other vector resonances) to top partner pairs that were overlooked in previous experimental searches at the LHC. These searches focused on simplified benchmark models in which the only new particle beyond the Standard Model was the heavy gluon. It turns out that, when kinematically allowed, such heavy-heavy decays make the heavy gluon elusive, and the bounds on its mass can be up to 2TeV milder than in the simpler models considered so far for the LHC14. We discuss the origin of this difference and prospects for dedicated searches.
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References
G. Perez, Best analysis tools, talk given at the 2014 Zurich Phenomenology Workshop, January 8–10, Zurich, Switzerland (2014).
CMS collaboration, Inclusive search for a vector-like T quark with charge 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 and single production of new heavy quarks that decay to a Z boson and a third-generation quark in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 11 (2014) 104 [arXiv:1409.5500] [INSPIRE].
ATLAS collaboration, A search for \( t\overline{t} \) resonances in the lepton plus jets final state with ATLAS using 14 fb −1 of pp collisions at \( \sqrt{s}=8 \) TeV, ATLAS-CONF-2013-052 (2013).
CMS collaboration, Searches for new physics using the \( t\overline{t} \) invariant mass distribution in pp collisions at \( \sqrt{s}=8 \) TeV, Phys. Rev. Lett. 111 (2013) 211804 [Erratum ibid. 112 (2014) 119903] [arXiv:1309.2030] [INSPIRE].
M.S. Carena, E. Ponton, J. Santiago and C.E.M. Wagner, Electroweak constraints on warped models with custodial symmetry, Phys. Rev. D 76 (2007) 035006 [hep-ph/0701055] [INSPIRE].
C. Anastasiou, E. Furlan and J. Santiago, Realistic composite Higgs models, Phys. Rev. D 79 (2009) 075003 [arXiv:0901.2117] [INSPIRE].
C. Grojean, O. Matsedonskyi and G. Panico, Light top partners and precision physics, JHEP 10 (2013) 160 [arXiv:1306.4655] [INSPIRE].
P. Biancofiore, L. Da Rold, S. Jager, G. Perez and A. Weiler, to appear.
M. Schmaltz, Physics beyond the standard model (theory): introducing the little Higgs, Nucl. Phys. Proc. Suppl. 117 (2003) 40 [hep-ph/0210415] [INSPIRE].
M. Ciuchini, E. Franco, S. Mishima and L. Silvestrini, Electroweak precision observables, new physics and the nature of a 126 GeV Higgs boson, JHEP 08 (2013) 106 [arXiv:1306.4644] [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].
J. Barnard, T. Gherghetta, A. Medina and T.S. Ray, Radiative corrections to the composite Higgs mass from a gluon partner, JHEP 10 (2013) 055 [arXiv:1307.4778] [INSPIRE].
A. Carmona and F. Goertz, A naturally light Higgs without light top partners, arXiv:1410.8555 [INSPIRE].
L. Randall and R. Sundrum, A large mass hierarchy from a small extra dimension, Phys. Rev. Lett. 83 (1999) 3370 [hep-ph/9905221] [INSPIRE].
N. Arkani-Hamed, M. Porrati and L. Randall, Holography and phenomenology, JHEP 08 (2001) 017 [hep-th/0012148] [INSPIRE].
K. Agashe, A. Belyaev, T. Krupovnickas, G. Perez and J. Virzi, LHC signals from warped extra dimensions, Phys. Rev. D 77 (2008) 015003 [hep-ph/0612015] [INSPIRE].
B. Lillie, L. Randall and L.-T. Wang, The bulk RS KK-gluon at the LHC, JHEP 09 (2007) 074 [hep-ph/0701166] [INSPIRE].
K. Agashe et al., LHC signals for warped electroweak neutral gauge bosons, Phys. Rev. D 76 (2007) 115015 [arXiv:0709.0007] [INSPIRE].
N. Vignaroli, New W-prime signals at the LHC, Phys. Rev. D 89 (2014) 095027 [arXiv:1404.5558] [INSPIRE].
M. Carena, A.D. Medina, B. Panes, N.R. Shah and C.E.M. Wagner, Collider phenomenology of gauge-Higgs unification scenarios in warped extra dimensions, Phys. Rev. D 77 (2008) 076003 [arXiv:0712.0095] [INSPIRE].
J. Santiago, The elusive gluon at the LHC, talk given at the Workshop on High Precision LHC Physics, May 23, ETH Zuirch, Switzerland (2014).
J. Santiago, New physics in \( t\overline{t}+X \) resonances, talk given at the Topical workshop on top quark differential distributions, September 26–28, Cannes, France (2014).
R. Barcelo, A. Carmona, M. Masip and J. Santiago, Stealth gluons at hadron colliders, Phys. Lett. B 707 (2012) 88 [arXiv:1106.4054] [INSPIRE].
R. Barcelo, A. Carmona, M. Chala, M. Masip and J. Santiago, Single vectorlike quark production at the LHC, Nucl. Phys. B 857 (2012) 172 [arXiv:1110.5914] [INSPIRE].
C. Bini, R. Contino and N. Vignaroli, Heavy-light decay topologies as a new strategy to discover a heavy gluon, JHEP 01 (2012) 157 [arXiv:1110.6058] [INSPIRE].
A. Carmona, M. Chala and J. Santiago, New Higgs production mechanism in composite Higgs models, JHEP 07 (2012) 049 [arXiv:1205.2378] [INSPIRE].
M. Chala and J. Santiago, \( Hb\overline{b} \) production in composite Higgs models, Phys. Rev. D 88 (2013) 035010 [arXiv:1305.1940] [INSPIRE].
K. Agashe, R. Contino and A. Pomarol, The minimal composite Higgs model, Nucl. Phys. B 719 (2005) 165 [hep-ph/0412089] [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].
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].
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].
ATLAS collaboration, M. Petteni, A search for \( t\overline{t} \) resonances in the dilepton channel in 1.04 fb −1 of pp collisions at \( \sqrt{s}=7 \) TeV with the ATLAS experiment, arXiv:1111.6933 [INSPIRE].
CMS Collaboration, Search for ttbar resonances in dilepton+jets final states in pp collisions at 8 TeV, CMS-PAS-B2G-12-007 (2012).
CMS collaboration, Search for anomalous top quark pair production in the boosted all-hadronic final state using pp collisions at \( \sqrt{s}=8 \) TeV, CMS-PAS-B2G-12-005 (2012).
ATLAS collaboration, Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at \( \sqrt{s}=7 \) TeV, JHEP 01 (2013) 116 [arXiv:1211.2202] [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].
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].
O. Matsedonskyi, G. Panico and A. Wulzer, On the interpretation of top partners searches, arXiv:1409.0100 [INSPIRE].
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].
M.L. Mangano, M. Moretti, F. Piccinini and M. Treccani, Matching matrix elements and shower evolution for top-quark production in hadronic collisions, JHEP 01 (2007) 013 [hep-ph/0611129] [INSPIRE].
P.M. Nadolsky et al., Implications of CTEQ global analysis for collider observables, Phys. Rev. D 78 (2008) 013004 [arXiv:0802.0007] [INSPIRE].
M. Czakon, P. Fiedler and A. Mitov, Total top-quark pair-production cross section at hadron colliders through O(α 2 S ), Phys. Rev. Lett. 110 (2013) 252004 [arXiv:1303.6254] [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].
ATLAS collaboration, Search for \( t\overline{t} \) resonances in the lepton plus jets final state with ATLAS using 4.7 fb −1 of pp collisions at \( \sqrt{s}=7 \) TeV, Phys. Rev. D 88 (2013) 012004 [arXiv:1305.2756] [INSPIRE].
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] [INSPIRE].
D. Krohn, J. Thaler and L.-T. Wang, Jet trimming, JHEP 02 (2010) 084 [arXiv:0912.1342] [INSPIRE].
ATLAS collaboration, Studies of sensitivity to new dilepton and ditop resonances with an upgraded ATLAS detector at a high-luminosity LHC, ATL-PHYS-PUB-2013-003 (2013).
M. Backović, G. Perez, T. Flacke and S.J. Lee, LHC top partner searches beyond the 2 TeV mass region, arXiv:1409.0409 [INSPIRE].
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] [INSPIRE].
M. Backovic, O. Gabizon, J. Juknevich, G. Perez and Y. Soreq, Measuring boosted tops in semi-leptonic \( t\overline{t} \) events for the standard model and beyond, JHEP 04 (2014) 176 [arXiv:1311.2962] [INSPIRE].
S. Willocq, Prospects on beyond the standard model physics at the HL-LHC, talk given at the ECFA High Luminosity LHC Experiments Workshop, October 21–23, Aix-Le-Bains, France (2014).
D. Greco and D. Liu, Hunting composite vector resonances at the LHC: naturalness facing data, arXiv:1410.2883 [INSPIRE].
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Chala, M., Juknevich, J., Perez, G. et al. The elusive gluon. J. High Energ. Phys. 2015, 92 (2015). https://doi.org/10.1007/JHEP01(2015)092
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DOI: https://doi.org/10.1007/JHEP01(2015)092