Abstract
Flavour-violating Higgs interactions are suppressed in the Standard Model such that their observation would be a clear sign of new physics. We investigate the prospects for detecting quark flavour-violating Higgs decays in the clean ILC environment. Concentrating on the decay to a bottom and a light quark j, we identify the dominant Standard Model background channels as coming from hadronic Standard Model Higgs decays with mis-identified jets. Therefore, good flavour tagging capabilities are essential to keep the background rate under control. Through a simple cut-based analysis, we find that the most promising search channel is the two-jet plus missing energy signature . At 500 GeV, the expected 95% CL upper limit on \( \mathrm{\mathcal{B}}\left(h\to bj\right) \) is of order 10−3. Correspondingly, a 5σ discovery is expected to be possible for branching ratios as low as a few 10−3.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.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].
ATLAS and CMS collaborations, Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC pp collision data at \( \sqrt{s}=7 \) and 8 TeV ATLAS-CONF-2015-044, (2015).
S. Bejar, F. Dilme, J. Guasch and J. Solà, Higgs boson flavor changing neutral decays into bottom quarks in supersymmetry, JHEP 08 (2004) 018 [hep-ph/0402188] [INSPIRE].
J.L. Diaz-Cruz and J.J. Toscano, Lepton flavor violating decays of Higgs bosons beyond the standard model, Phys. Rev. D 62 (2000) 116005 [hep-ph/9910233] [INSPIRE].
G.C. Branco, P.M. Ferreira, L. Lavoura, M.N. Rebelo, M. Sher and J.P. Silva, Theory and phenomenology of two-Higgs-doublet models, Phys. Rept. 516 (2012) 1 [arXiv:1106.0034] [INSPIRE].
A. Crivellin, A. Kokulu and C. Greub, Flavor-phenomenology of two-Higgs-doublet models with generic Yukawa structure, Phys. Rev. D 87 (2013) 094031 [arXiv:1303.5877] [INSPIRE].
F.J. Botella, G.C. Branco, M. Nebot and M.N. Rebelo, Flavour Changing Higgs Couplings in a Class of Two Higgs Doublet Models, Eur. Phys. J. C 76 (2016) 161 [arXiv:1508.05101] [INSPIRE].
A. Crivellin, J. Heeck and D. Mueller, Large h → bs in generic two-Higgs-doublet models, arXiv:1710.04663 [INSPIRE].
A. Arhrib, Y. Cheng and O.C.W. Kong, Comprehensive analysis on lepton flavor violating Higgs boson to μ ∓ τ ± decay in supersymmetry without R parity, Phys. Rev. D 87 (2013) 015025 [arXiv:1210.8241] [INSPIRE].
K. Agashe and R. Contino, Composite Higgs-Mediated FCNC, Phys. Rev. D 80 (2009) 075016 [arXiv:0906.1542] [INSPIRE].
A. Azatov, M. Toharia and L. Zhu, Higgs Mediated FCNC’s in Warped Extra Dimensions, Phys. Rev. D 80 (2009) 035016 [arXiv:0906.1990] [INSPIRE].
CMS collaboration, Search for Lepton-Flavour-Violating Decays of the Higgs Boson, Phys. Lett. B 749 (2015) 337 [arXiv:1502.07400] [INSPIRE].
CMS collaboration, Search for lepton flavour violating decays of the Higgs boson to μτ and eτ in proton-proton collisions at \( \sqrt{s}=13 \) TeV, CMS-PAS-HIG-17-001 [INSPIRE].
ATLAS collaboration, Search for flavour-changing neutral current top quark decays t → Hq in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 12 (2015) 061 [arXiv:1509.06047] [INSPIRE].
CMS collaboration, Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at \( \sqrt{s}=8 \) TeV, JHEP 02 (2017) 079 [arXiv:1610.04857] [INSPIRE].
T. Behnke et al., The International Linear Collider Technical Design Report - Volume 1: Executive Summary, arXiv:1306.6327 [INSPIRE].
H. Baer et al., The International Linear Collider Technical Design Report - Volume 2: Physics, arXiv:1306.6352 [INSPIRE].
B. Grzadkowski, M. Iskrzynski, M. Misiak and J. Rosiek, Dimension-Six Terms in the Standard Model Lagrangian, JHEP 10 (2010) 085 [arXiv:1008.4884] [INSPIRE].
R. Harnik, J. Kopp and J. Zupan, Flavor Violating Higgs Decays, JHEP 03 (2013) 026 [arXiv:1209.1397] [INSPIRE].
D.M. Asner et al., ILC Higgs White Paper, in Proceedings, Community Summer Study 2013: Snowmass on the Mississippi (CSS2013): Minneapolis, MN, U.S.A., July 29 – August 6, 2013, arXiv:1310.0763 [INSPIRE].
CMS collaboration, Evidence for the decay of the Higgs Boson to Bottom Quarks, CMS-PAS-HIG-16-044 [INSPIRE].
ATLAS collaboration, Evidence for the \( H\to b\overline{b} \) decay with the ATLAS detector, JHEP 12 (2017) 024 [arXiv:1708.03299] [INSPIRE].
Particle Data Group collaboration, C. Patrignani et al., Review of Particle Physics, Chin. Phys. C 40 (2016) 100001 [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].
C. Degrande, C. Duhr, B. Fuks, D. Grellscheid, O. Mattelaer and T. Reiter, UFO - The Universal FeynRules Output, Comput. Phys. Commun. 183 (2012) 1201 [arXiv:1108.2040] [INSPIRE].
W. Kilian, T. Ohl and J. Reuter, WHIZARD: Simulating Multi-Particle Processes at LHC and ILC, Eur. Phys. J. C 71 (2011) 1742 [arXiv:0708.4233] [INSPIRE].
M. Moretti, T. Ohl and J. Reuter, O’Mega: An optimizing matrix element generator, hep-ph/0102195 [INSPIRE].
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
T. Sjöstrand et al., An introduction to PYTHIA 8.2, Comput. Phys. Commun. 191 (2015) 159 [arXiv:1410.3012] [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].
C.T. Potter, DSiD: a Delphes Detector for ILC Physics Studies, in Proceedings, International Workshop on Future Linear Colliders (LCWS15): Whistler, B.C., Canada, November 2–6, 2015, arXiv:1602.07748 [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].
E. Conte, B. Fuks and G. Serret, MadAnalysis 5, A User-Friendly Framework for Collider Phenomenology, Comput. Phys. Commun. 184 (2013) 222 [arXiv:1206.1599] [INSPIRE].
T. Suehara and T. Tanabe, LCFIPlus: A Framework for Jet Analysis in Linear Collider Studies, Nucl. Instrum. Meth. A 808 (2016) 109 [arXiv:1506.08371] [INSPIRE].
T. Barklow et al., ILC Operating Scenarios, arXiv:1506.07830 [INSPIRE].
LHC Higgs Cross section Working Group collaboration, D. de Florian et al., Handbook of LHC Higgs Cross sections: 4. Deciphering the Nature of the Higgs Sector, arXiv:1610.07922 [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: 1710.06657
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
Barducci, D., Helmboldt, A.J. Quark flavour-violating Higgs decays at the ILC. J. High Energ. Phys. 2017, 105 (2017). https://doi.org/10.1007/JHEP12(2017)105
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP12(2017)105