Abstract
We analyze decays of vectorlike quarks in extensions of the standard model and a two Higgs doublet model. We identify several typical patterns of branching ratios of the lightest new up-type quark, t4, and down-type quark, b4, depending on the structure of Yukawa couplings that mix the vectorlike and standard model quarks (we assume only mixing with the third generation) and also on their doublet or singlet nature. We find that decays into heavy neutral or charged Higgs bosons, when kinematically open, can easily dominate and even be close to 100%: b4 → Hb at medium to large tan β, t4 → Ht at small tan β and b4 → H±t, t4 → H±b at both large and small tan β. The pair production of vectorlike quarks leads to 6t, 4t2b, 2t4b and 6b final states. The decay modes into W, Z and h follow the pattern expected from the Goldstone boson equivalence limit that we generalize to scenarios with all possible couplings. We also discuss in detail the structure of Yukawa couplings required to significantly deviate from the pattern characteristic of the Goldstone boson equivalence limit that can result in essentially arbitrary branching ratios.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
ATLAS collaboration, Search for pair production of up-type vector-like quarks and for four-top-quark events in final states with multiple b-jets with the ATLAS detector, JHEP 07 (2018)089 [arXiv:1803.09678] [INSPIRE].
ATLAS collaboration, Search for pair production of heavy vector-like quarks decaying to high-p T W bosons and b quarks in the lepton-plus-jets final state in pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector, JHEP 10 (2017) 141 [arXiv:1707.03347] [INSPIRE].
ATLAS collaboration, Combination of the searches for pair-produced vector-like partners of the third-generation quarks at \( \sqrt{s}=13 \) TeV with the ATLAS detector, Phys. Rev. Lett. 121 (2018) 211801 [arXiv:1808.02343] [INSPIRE].
CMS collaboration, Search for single production of vector-like quarks decaying to a b quark and a Higgs boson, JHEP 06 (2018) 031 [arXiv:1802.01486] [INSPIRE].
CMS collaboration, Search for pair production of vector-like quarks in the \( bW\overline{b}W \) channel from proton-proton collisions at \( \sqrt{s}=13 \) TeV, Phys. Lett. B 779 (2018) 82 [arXiv:1710.01539] [INSPIRE].
CMS collaboration, Search for vector-like T and B quark pairs in final states with leptons at \( \sqrt{s}=13 \) TeV, JHEP 08 (2018) 177 [arXiv:1805.04758] [INSPIRE].
ATLAS collaboration, Search for pair- and single-production of vector-like quarks in final states with at least one Z boson decaying into a pair of electrons or muons in pp collision data collected with the ATLAS detector at \( \sqrt{s}=13 \) TeV, Phys. Rev. D 98 (2018) 112010 [arXiv:1806.10555] [INSPIRE].
ATLAS collaboration, Search for single production of a vector-like B quark decaying into a bottom quark and a Higgs boson which decays into a pair of photons, ATLAS-CONF-2018-024, CERN, Geneva, Switzerland (2018).
CMS collaboration, Search for single production of a vector-like T quark decaying to a Z boson and a top quark in proton-proton collisions at \( \sqrt{s}=13 \) TeV, Phys. Lett. B 781 (2018) 574 [arXiv:1708.01062] [INSPIRE].
CMS collaboration, Search for single production of vector-like quarks decaying to a top quark and a W boson in proton-proton collisions at \( \sqrt{s}=13 \) TeV, Eur. Phys. J. C 79 (2019) 90 [arXiv:1809.08597] [INSPIRE].
CMS collaboration, Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton+jets final state in pp collisions at \( \sqrt{s}=13 \) TeV, Eur. Phys. J. C 79 (2019) 208 [arXiv:1812.06489] [INSPIRE].
ATLAS collaboration, Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb −1 of pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector, JHEP 01 (2018) 055 [arXiv:1709.07242] [INSPIRE].
ATLAS collaboration, Search for charged Higgs bosons decaying via H ± → τ ±ντ in the τ+jets and τ+lepton final states with 36 fb −1 of pp collision data recorded at \( \sqrt{s}=13 \) TeV with the ATLAS experiment, JHEP 09 (2018) 139 [arXiv:1807.07915] [INSPIRE].
CMS collaboration, Search for additional neutral MSSM Higgs bosons in the ττ final state in proton-proton collisions at \( \sqrt{s}=13 \) TeV, JHEP 09 (2018) 007 [arXiv:1803.06553] [INSPIRE].
K.S. Babu and J.C. Pati, The problems of unification mismatch and low α 3 : a solution with light vector-like matter, Phys. Lett. B 384 (1996) 140 [hep-ph/9606215] [INSPIRE].
C.F. Kolda and J. March-Russell, Low-energy signatures of semiperturbative unification, Phys. Rev. D 55 (1997) 4252 [hep-ph/9609480] [INSPIRE].
D. Ghilencea, M. Lanzagorta and G.G. Ross, Strong unification, Phys. Lett. B 415 (1997) 253 [hep-ph/9707462] [INSPIRE].
G. Amelino-Camelia, D. Ghilencea and G.G. Ross, The effect of Yukawa couplings on unification predictions and the nonperturbative limit, Nucl. Phys. B 528 (1998) 35 [hep-ph/9804437] [INSPIRE].
M. Bastero-Gil and B. Brahmachari, Semiperturbative unification with extra vector-like families, Nucl. Phys. B 575 (2000) 35 [hep-ph/9907318] [INSPIRE].
R. Dermisek, Insensitive unification of gauge couplings, Phys. Lett. B 713 (2012) 469 [arXiv:1204.6533] [INSPIRE].
R. Dermisek, Unification of gauge couplings in the Standard Model with extra vectorlike families, Phys. Rev. D 87 (2013) 055008 [arXiv:1212.3035] [INSPIRE].
R. Dermisek and N. McGinnis, Mass scale of vectorlike matter and superpartners from IR fixed point predictions of gauge and top Yukawa couplings, Phys. Rev. D 97 (2018) 055009 [arXiv:1712.03527] [INSPIRE].
R. Dermíšek and N. McGinnis, Top-bottom-tau Yukawa coupling unification in the MSSM plus one vectorlike family and fermion masses as IR fixed points, Phys. Rev. D 99 (2019) 035033 [arXiv:1810.12474] [INSPIRE].
K.S. Babu, I. Gogoladze, M.U. Rehman and Q. Shafi, Higgs boson mass, sparticle spectrum and little hierarchy problem in extended MSSM, Phys. Rev. D 78 (2008) 055017 [arXiv:0807.3055] [INSPIRE].
S.P. Martin, Extra vector-like matter and the lightest Higgs scalar boson mass in low-energy supersymmetry, Phys. Rev. D 81 (2010) 035004 [arXiv:0910.2732] [INSPIRE].
R. Dermisek, Loop suppressed electroweak symmetry breaking and naturally heavy superpartners, Phys. Rev. D 95 (2017) 015002 [arXiv:1606.09031] [INSPIRE].
T. Moroi, H. Murayama and T. Yanagida, The Weinberg angle without grand unification, Phys. Rev. D 48 (1993) R2995 [hep-ph/9306268] [INSPIRE].
R. Dermíšek and N. McGinnis, Seven largest couplings of the Standard Model as IR fixed points, arXiv:1812.05240 [INSPIRE].
D. Choudhury, T.M.P. Tait and C.E.M. Wagner, Beautiful mirrors and precision electroweak data, Phys. Rev. D 65 (2002) 053002 [hep-ph/0109097] [INSPIRE].
R. Dermisek, S.-G. Kim and A. Raval, New vector boson near the Z-pole and the puzzle in precision electroweak data, Phys. Rev. D 84 (2011) 035006 [arXiv:1105.0773] [INSPIRE].
R. Dermisek, S.-G. Kim and A. Raval, Z′ near the Z-pole, Phys. Rev. D 85 (2012) 075022 [arXiv:1201.0315] [INSPIRE].
B. Batell, S. Gori and L.-T. Wang, Higgs couplings and precision electroweak data, JHEP 01 (2013) 139 [arXiv:1209.6382] [INSPIRE].
K. Kannike, M. Raidal, D.M. Straub and A. Strumia, Anthropic solution to the magnetic muon anomaly: the charged see-saw, JHEP 02 (2012) 106 [Erratum ibid. 10 (2012) 136] [arXiv:1111.2551] [INSPIRE].
R. Dermisek and A. Raval, Explanation of the muon g − 2 anomaly with vectorlike leptons and its implications for Higgs decays, Phys. Rev. D 88 (2013) 013017 [arXiv:1305.3522] [INSPIRE].
R. Dermisek, A. Raval and S. Shin, Effects of vectorlike leptons on h → 4ℓ and the connection to the muon g − 2 anomaly, Phys. Rev. D 90 (2014) 034023 [arXiv:1406.7018] [INSPIRE].
R. Dermisek, E. Lunghi and S. Shin, Contributions of flavor violating couplings of a Higgs boson to pp → WW, JHEP 08 (2015) 126 [arXiv:1503.08829] [INSPIRE].
R. Dermisek, E. Lunghi and S. Shin, Two Higgs doublet model with vectorlike leptons and contributions to pp → WW and H → WW, JHEP 02 (2016) 119 [arXiv:1509.04292] [INSPIRE].
R. Dermisek, E. Lunghi and S. Shin, New decay modes of heavy Higgs bosons in a two Higgs doublet model with vectorlike leptons, JHEP 05 (2016) 148 [arXiv:1512.07837] [INSPIRE].
R. Dermisek, E. Lunghi and S. Shin, New constraints and discovery potential for Higgs to Higgs cascade decays through vectorlike leptons, JHEP 10 (2016) 081 [arXiv:1608.00662] [INSPIRE].
R. Dermisek, J.P. Hall, E. Lunghi and S. Shin, Limits on vectorlike leptons from searches for anomalous production of multi-lepton events, JHEP 12 (2014) 013 [arXiv:1408.3123] [INSPIRE].
X. Cid Vidal et al., Beyond the Standard Model physics at the HL-LHC and HE-LHC, arXiv:1812.07831 [INSPIRE].
G. Cacciapaglia, A. Deandrea, D. Harada and Y. Okada, Bounds and decays of new heavy vector-like top partners, JHEP 11 (2010) 159 [arXiv:1007.2933] [INSPIRE].
Y. Okada and L. Panizzi, LHC signatures of vector-like quarks, Adv. High Energy Phys. 2013 (2013) 364936 [arXiv:1207.5607] [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].
A.K. Alok, S. Banerjee, D. Kumar and S. Uma Sankar, Flavor signatures of isosinglet vector-like down quark model, Nucl. Phys. B 906 (2016) 321 [arXiv:1402.1023] [INSPIRE].
S. Banerjee, D. Barducci, G. Bélanger and C. Delaunay, Implications of a high-mass diphoton resonance for heavy quark searches, JHEP 11 (2016) 154 [arXiv:1606.09013] [INSPIRE].
B.A. Dobrescu and F. Yu, Exotic signals of vectorlike quarks, J. Phys. G 45 (2018) 08LT01 [arXiv:1612.01909] [INSPIRE].
M. Chala, Direct bounds on heavy toplike quarks with standard and exotic decays, Phys. Rev. D 96 (2017) 015028 [arXiv:1705.03013] [INSPIRE].
J.H. Kim and I.M. Lewis, Loop induced single top partner production and decay at the LHC, JHEP 05 (2018) 095 [arXiv:1803.06351] [INSPIRE].
K. Das, T. Mondal and S.K. Rai, Non-standard signatures of vector-like quarks in a leptophobic 221 model, arXiv:1807.08160 [INSPIRE].
H. Alhazmi, J.H. Kim, K. Kong and I.M. Lewis, Shedding light on top partner at the LHC, JHEP 01 (2019) 139 [arXiv:1808.03649] [INSPIRE].
D. Liu, L.-T. Wang and K.-P. Xie, Prospects of searching for composite resonances at the LHC and beyond, JHEP 01 (2019) 157 [arXiv:1810.08954] [INSPIRE].
Particle Data Group collaboration, Review of particle physics, Phys. Rev. D 98 (2018) 030001 [INSPIRE].
C.-Y. Chen, S. Dawson and E. Furlan, Vectorlike fermions and Higgs effective field theory revisited, Phys. Rev. D 96 (2017) 015006 [arXiv:1703.06134] [INSPIRE].
ATLAS collaboration, Measurements of Higgs boson properties in the diphoton decay channel with 36.1 fb −1 pp collision data at the center-of-mass energy of 13 TeV with the ATLAS detector, ATLAS-CONF-2017-045, CERN, Geneva, Switzerland (2017).
ATLAS collaboration, Combined measurements of Higgs boson production and decay using up to 80 fb −1 of proton-proton collision data at \( \sqrt{s}=13 \) TeV collected with the ATLAS experiment, ATLAS-CONF-2018-031, CERN, Geneva, Switzerland (2018).
CMS collaboration, Observation of the diphoton decay of the Higgs boson and measurement of its properties, Eur. Phys. J. C 74 (2014) 3076 [arXiv:1407.0558] [INSPIRE].
ATLAS collaboration, Measurements of Higgs boson properties in the diphoton decay channel with 36 fb −1 of pp collision data at \( \sqrt{s}=13 \) TeV with the ATLAS detector, Phys. Rev. D 98 (2018) 052005 [arXiv:1802.04146] [INSPIRE].
CMS collaboration, Search for a Standard Model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at \( \sqrt{s}=8 \) and 13 TeV, submitted to Phys. Lett. B (2018) [arXiv:1811.08459] [INSPIRE].
ATLAS collaboration, Combination of the searches for pair-produced vector-like partners of the third generation quarks at \( \sqrt{s}=13 \) TeV with the ATLAS detector, ATLAS-CONF-2018-032, CERN, Geneva, Switzerland (2018).
The leptonic VLQ candidate mass distributions in the signal region after the maximum likelihood fit in the signal region and control region webpage, https://hepdata.net/record/ins1609451.
CMS collaboration, Search for single production of vector-like quarks decaying into a b quark and a W boson in proton-proton collisions at \( \sqrt{s}=13 \) TeV, Phys. Lett. B 772 (2017) 634 [arXiv:1701.08328] [INSPIRE].
R. Dermisek, E. Lunghi and S. Shin, Hunting for heavy Higgses in models with vectorlike quarks, work in progress.
A.J. Buras, Weak Hamiltonian, CP-violation and rare decays, in Probing the Standard Model of particle interactions. Proceedings, Summer School in Theoretical Physics, NATO Advanced Study Institute, 68th session, Les Houches, France, 28 July–5 September 1997, (1998), pg. 281 [hep-ph/9806471] [INSPIRE].
A. Atre et al., Model-independent searches for new quarks at the LHC, JHEP 08 (2011) 080 [arXiv:1102.1987] [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: 1901.03709
Rights and permissions
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, 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 licence, and indicate if changes were made.
The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/.
About this article
Cite this article
Dermíšek, R., Lunghi, E. & Shin, S. Hunting for vectorlike quarks. J. High Energ. Phys. 2019, 19 (2019). https://doi.org/10.1007/JHEP04(2019)019
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP04(2019)019