Abstract
We perform a complete one-loop computation of the two-body flavour-changing top decays t → ch and t → cV (V = γ, Z), within the aligned two-Higgs-doublet model. We evaluate the impact of the model parameters on the associated branching ratios, taking into account constraints from flavour data and measurements of the Higgs properties. Assuming that the 125 GeV Higgs corresponds to the lightest CP-even scalar of the CP-conserving aligned two-Higgs-doublet model, we find that the rates for such flavour-changing top decays lie below the expected sensitivity of the future high-luminosity phase of the LHC. Measurements of the Higgs signal strength in the di-photon channel are found to play an important role in limiting the size of the t → ch decay rate when the charged scalar of the model is light.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
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].
S.L. Glashow, J. Iliopoulos and L. Maiani, Weak interactions with lepton-hadron symmetry, Phys. Rev. D 2 (1970) 1285 [INSPIRE].
G.C. Branco et al., Theory and phenomenology of two-Higgs-doublet models, Phys. Rept. 516 (2012) 1 [arXiv:1106.0034] [INSPIRE].
S.L. Glashow and S. Weinberg, Natural conservation laws for neutral currents, Phys. Rev. D 15 (1977) 1958 [INSPIRE].
E.A. Paschos, Diagonal neutral currents, Phys. Rev. D 15 (1977) 1966 [INSPIRE].
A. Pich and P. Tuzon, Yukawa alignment in the two-Higgs-doublet model, Phys. Rev. D 80 (2009) 091702 [arXiv:0908.1554] [INSPIRE].
H. Serodio, Yukawa alignment in a multi Higgs doublet model: an effective approach, Phys. Lett. B 700 (2011) 133 [arXiv:1104.2545] [INSPIRE].
G. Cree and H.E. Logan, Yukawa alignment from natural flavor conservation, Phys. Rev. D 84 (2011) 055021 [arXiv:1106.4039] [INSPIRE].
I. de Medeiros Varzielas, Family symmetries and alignment in multi-Higgs doublet models, Phys. Lett. B 701 (2011) 597 [arXiv:1104.2601] [INSPIRE].
A. Celis, J. Fuentes-Martín and H. Serôdio, Effective aligned 2HDM with a DFSZ-like invisible axion, Phys. Lett. B 737 (2014) 185 [arXiv:1407.0971] [INSPIRE].
F.J. Botella, G.C. Branco, A.M. Coutinho, M.N. Rebelo and J.I. Silva-Marcos, Natural quasi-alignment with two Higgs doublets and RGE stability, arXiv:1501.07435 [INSPIRE].
M. Jung, A. Pich and P. Tuzon, Charged-Higgs phenomenology in the aligned two-Higgs-doublet model, JHEP 11 (2010) 003 [arXiv:1006.0470] [INSPIRE].
M. Jung, X.-Q. Li and A. Pich, Exclusive radiative B-meson decays within the aligned two-Higgs-doublet model, JHEP 10 (2012) 063 [arXiv:1208.1251] [INSPIRE].
A. Celis, M. Jung, X.-Q. Li and A. Pich, Sensitivity to charged scalars in B → D (∗) τ ν τ and B → τν τ decays, JHEP 01 (2013) 054 [arXiv:1210.8443] [INSPIRE].
M. Jung and A. Pich, Electric dipole moments in two-Higgs-doublet models, JHEP 04 (2014) 076 [arXiv:1308.6283] [INSPIRE].
X.-Q. Li, J. Lu and A. Pich, B 0 s,d → ℓ + ℓ − decays in the aligned two-Higgs-doublet model, JHEP 06 (2014) 022 [arXiv:1404.5865] [INSPIRE].
W. Dekens et al., Unraveling models of CP-violation through electric dipole moments of light nuclei, JHEP 07 (2014) 069 [arXiv:1404.6082] [INSPIRE].
W. Altmannshofer, S. Gori and G.D. Kribs, A minimal flavor violating 2HDM at the LHC, Phys. Rev. D 86 (2012) 115009 [arXiv:1210.2465] [INSPIRE].
Y. Bai, V. Barger, L.L. Everett and G. Shaughnessy, General two Higgs doublet model (2HDM-G) and Large Hadron Collider data, Phys. Rev. D 87 (2013) 115013 [arXiv:1210.4922] [INSPIRE].
A. Celis, V. Ilisie and A. Pich, LHC constraints on two-Higgs doublet models, JHEP 07 (2013) 053 [arXiv:1302.4022] [INSPIRE].
V. Barger, L.L. Everett, H.E. Logan and G. Shaughnessy, Scrutinizing the 125 GeV Higgs boson in two Higgs doublet models at the LHC, ILC and Muon Collider, Phys. Rev. D 88 (2013) 115003 [arXiv:1308.0052] [INSPIRE].
D. López-Val, T. Plehn and M. Rauch, Measuring extended Higgs sectors as a consistent free couplings model, JHEP 10 (2013) 134 [arXiv:1308.1979] [INSPIRE].
L. Duarte, G.A. González-Sprinberg and J. Vidal, Top quark anomalous tensor couplings in the two-Higgs-doublet models, JHEP 11 (2013) 114 [arXiv:1308.3652] [INSPIRE].
A. Celis, V. Ilisie and A. Pich, Towards a general analysis of LHC data within two-Higgs-doublet models, JHEP 12 (2013) 095 [arXiv:1310.7941] [INSPIRE].
L. Wang and X.-F. Han, Status of the aligned two-Higgs-doublet model confronted with the Higgs data, JHEP 04 (2014) 128 [arXiv:1312.4759] [INSPIRE].
G. Eilam, B. Haeri and A. Soni, Flavor changing Higgs transitions, Phys. Rev. D 41 (1990) 875 [INSPIRE].
J.L. Diaz-Cruz, R. Martinez, M.A. Perez and A. Rosado, Flavor changing radiative decay of the T quark, Phys. Rev. D 41 (1990) 891 [INSPIRE].
G. Eilam, J.L. Hewett and A. Soni, Rare decays of the top quark in the standard and two Higgs doublet models, Phys. Rev. D 44 (1991) 1473 [Erratum ibid. D 59 (1999) 039901] [INSPIRE].
W.-S. Hou, Tree level t → chorh → \( t\overline{c} \) decays, Phys. Lett. B 296 (1992) 179 [INSPIRE].
D. Atwood, L. Reina and A. Soni, Phenomenology of two Higgs doublet models with flavor changing neutral currents, Phys. Rev. D 55 (1997) 3156 [hep-ph/9609279] [INSPIRE].
B. Mele, S. Petrarca and A. Soddu, A new evaluation of the t → cH decay width in the standard model, Phys. Lett. B 435 (1998) 401 [hep-ph/9805498] [INSPIRE].
J.A. Aguilar-Saavedra, Top flavor-changing neutral interactions: theoretical expectations and experimental detection, Acta Phys. Polon. B 35 (2004) 2695 [hep-ph/0409342] [INSPIRE].
A. Arhrib, Top and Higgs flavor changing neutral couplings in two Higgs doublets model, Phys. Rev. D 72 (2005) 075016 [hep-ph/0510107] [INSPIRE].
S. Bejar, J. Guasch and J. Solà, Loop induced flavor changing neutral decays of the top quark in a general two Higgs doublet model, Nucl. Phys. B 600 (2001) 21 [hep-ph/0011091] [INSPIRE].
ATLAS collaboration, A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at \( \sqrt{s}=7 \) TeV, JHEP 09 (2012) 139 [arXiv:1206.0257] [INSPIRE].
ATLAS collaboration, Search for top quark decays t → qH with H → γγ using the ATLAS detector, JHEP 06 (2014) 008 [arXiv:1403.6293] [INSPIRE].
CMS collaboration, Search for flavor-changing neutral currents in top-quark decays t → Zq in pp collisions at \( \sqrt{s}=8 \) TeV, Phys. Rev. Lett. 112 (2014) 171802 [arXiv:1312.4194] [INSPIRE].
CMS collaboration, Search for anomalous single top quark production in association with a photon, CMS-PAS-TOP-14-003 (2014).
CMS collaboration, Combined multilepton and diphoton limit on t → cH, CMS-PAS-HIG-13-034 (2013).
CDF, D0, ATLAS, CMS collaboration, R. Goldouzian, Search for FCNC in top quark production and decays, arXiv:1412.2524 [INSPIRE].
J.A. Aguilar-Saavedra and G.C. Branco, Probing top flavor changing neutral scalar couplings at the CERN LHC, Phys. Lett. B 495 (2000) 347 [hep-ph/0004190] [INSPIRE].
Top Quark Working Group collaboration, K. Agashe et al., Working group report: top quark, arXiv:1311.2028 [INSPIRE].
D. O’Neil, Phenomenology of the basis-independent CP-violating two-Higgs doublet model [Dissertation], arXiv:0908.1363 [INSPIRE].
D.M. Asner et al., ILC Higgs white paper, arXiv:1310.0763 [INSPIRE].
N. Cabibbo, Unitary symmetry and leptonic decays, Phys. Rev. Lett. 10 (1963) 531 [INSPIRE].
M. Kobayashi and T. Maskawa, CP violation in the renormalizable theory of weak interaction, Prog. Theor. Phys. 49 (1973) 652 [INSPIRE].
P.M. Ferreira, L. Lavoura and J.P. Silva, Renormalization-group constraints on Yukawa alignment in multi-Higgs-doublet models, Phys. Lett. B 688 (2010) 341 [arXiv:1001.2561] [INSPIRE].
C.B. Braeuninger, A. Ibarra and C. Simonetto, Radiatively induced flavour violation in the general two-Higgs doublet model with Yukawa alignment, Phys. Lett. B 692 (2010) 189 [arXiv:1005.5706] [INSPIRE].
J. Bijnens, J. Lu and J. Rathsman, Constraining general two Higgs doublet models by the evolution of Yukawa couplings, JHEP 05 (2012) 118 [arXiv:1111.5760] [INSPIRE].
G. Cvetič, S.S. Hwang and C.S. Kim, One loop renormalization group equations of the general framework with two Higgs doublets, Int. J. Mod. Phys. A 14 (1999) 769 [hep-ph/9706323] [INSPIRE].
G. Cvetič, C.S. Kim and S.S. Hwang, Higgs mediated flavor changing neutral currents in the general framework with two Higgs doublets: An RGE analysis, Phys. Rev. D 58 (1998) 116003 [hep-ph/9806282] [INSPIRE].
B. Haeri, A. Soni and G. Eilam, Production of the standard Higgs via decays of the b ′ quark, Phys. Rev. Lett. 62 (1989) 719 [INSPIRE].
Particle Data Group collaboration, K.A. Olive et al., Review of particle physics, Chin. Phys. C 38 (2014) 090001 [INSPIRE].
J. Charles et al., Current status of the standard model CKM fit and constraints on ΔF = 2 new physics, Phys. Rev. D 91 (2015) 073007 [arXiv:1501.05013] [INSPIRE].
S. Aoki et al., Review of lattice results concerning low-energy particle physics, Eur. Phys. J. C 74 (2014) 2890 [arXiv:1310.8555] [INSPIRE].
A. Alberti, P. Gambino, K.J. Healey and S. Nandi, Precision determination of the Cabibbo-Kobayashi-Maskawa element V cb , Phys. Rev. Lett. 114 (2015) 061802 [arXiv:1411.6560] [INSPIRE].
P. Gambino and C. Schwanda, Inclusive semileptonic fits, heavy quark masses and V cb , Phys. Rev. D 89 (2014) 014022 [arXiv:1307.4551] [INSPIRE].
G. Ricciardi, Status of |V cb | and |V ub | CKM matrix elements, arXiv:1412.4288 [INSPIRE].
ATLAS collaboration, Measurement of the Higgs boson mass from the H → γγ and H →ZZ ∗ →4ℓ channels with the ATLAS detector using 25fb −1 of pp collision data, Phys. Rev. D 90 (2014) 052004 [arXiv:1406.3827] [INSPIRE].
CMS collaboration, Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV, Eur. Phys. J. C 75 (2015) 212 [arXiv:1412.8662] [INSPIRE].
ATLAS, CDF, CMS, D0 collaboration, First combination of Tevatron and LHC measurements of the top-quark mass, arXiv:1403.4427 [INSPIRE].
G. Degrassi, P. Gambino and P.P. Giardino, The m W -m Z interdependence in the standard model: a new scrutiny, arXiv:1411.7040 [INSPIRE].
A.H. Hoang, The top mass: interpretation and theoretical uncertainties, arXiv:1412.3649 [INSPIRE].
ALEPH, DELPHI, L3, OPAL, LEP collaboration, G. Abbiendi et al., Search for charged Higgs bosons: combined results using LEP data, Eur. Phys. J. C 73 (2013) 2463 [arXiv:1301.6065] [INSPIRE].
ATLAS collaboration, Search for a light charged Higgs boson in the decay channel \( {H}^{+}\to c\overline{s} \) in \( t\overline{t} \) events using pp collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, Eur. Phys. J. C 73 (2013) 2465 [arXiv:1302.3694] [INSPIRE].
ATLAS collaboration, Search for charged Higgs bosons decaying via H ± → τ ± ν in fully hadronic final states using pp collision data at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 03 (2015) 088 [arXiv:1412.6663] [INSPIRE].
CMS collaboration, Search for charged Higgs bosons with the H + → τ ν decay channel in the fully hadronic final state at \( \sqrt{s}=8 \) TeV, CMS-PAS-HIG-14-020 (2014).
CMS collaboration, Search for H + tocs-bar decay, CMS-PAS-HIG-13-035 (2013).
CDF, D0 collaborations, Review of charged Higgs searches at the Tevatron, PoS(CHARGED 2010)004.
ATLAS collaboration, Measurements of the Higgs boson production and decay rates and coupling strengths using pp collision data at \( \sqrt{s}=7 \) and 8 TeV in the ATLAS experiment, ATLAS-CONF-2015-007 (2015).
G. Durieux, F. Maltoni and C. Zhang, Global approach to top-quark flavor-changing interactions, Phys. Rev. D 91 (2015) 074017 [arXiv:1412.7166] [INSPIRE].
A. Greljo, J.F. Kamenik and J. Kopp, Disentangling flavor violation in the top-Higgs sector at the LHC, JHEP 07 (2014) 046 [arXiv:1404.1278] [INSPIRE].
G. ’t Hooft and M.J.G. Veltman, Scalar one loop integrals, Nucl. Phys. B 153 (1979) 365 [INSPIRE].
G. Passarino and M.J.G. Veltman, One loop corrections for e + e − annihilation into μ + μ − in the Weinberg model, Nucl. Phys. B 160 (1979) 151 [INSPIRE].
A. Axelrod, Flavor changing Z0 decay and the top quark, Nucl. Phys. B 209 (1982) 349 [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: 1503.06423
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
Abbas, G., Celis, A., Li, XQ. et al. Flavour-changing top decays in the aligned two-Higgs-doublet model. J. High Energ. Phys. 2015, 5 (2015). https://doi.org/10.1007/JHEP06(2015)005
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP06(2015)005