Title: Enhancing the Higgs associated production with a top quark pair

Abstract

It is pointed out that in a wide class of models reminiscent of type-II Two-Higgs-Doublet Models (2HDM) the signal of the Higgs produced in association with a top-antitop quark pair ($tth$) and decaying into gauge bosons can be significantly larger than the Standard Model (SM) prediction without violating any experimental constraints. The crucial feature of these models is enhanced (suppressed) Higgs coupling to top (bottom) quarks and existence of light colored particles that give negative contribution to the effective Higgs coupling to gluons resulting in the gluon fusion rates in the gauge boson decay channels close to SM predictions. We demonstrate this mechanism in NMSSM with light stops and show that $tth$ signal in the W W decay channel can be two times larger than the SM prediction, as suggested by the excesses observed by ATLAS and CMS, provided that the Higgs-singlet superpotential coupling $λ ≳$ 0.8 and the MSSM-like Higgs boson masses are in the range of 160 to 300 GeV.

Authors:

Badziak, Marcin ^[1]; Wagner, Carlos E. M. ^[2]

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+ Show Author Affiliations

1. Univ. of Warsaw (Poland). Inst. of Theoretical Physics
2. Univ. of Chicago, IL (United States). Enrico Fermi Inst.; Argonne National Lab. (ANL), Argonne, IL (United States). High Energy Physics Division; Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP)

Publication Date:

Fri May 20 00:00:00 EDT 2016

Research Org.:

Univ. of Chicago, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), High Energy Physics (HEP); National Science Centre (NCN) (Poland); Polish Ministry of Science and Higher Education; National Science Foundation (NSF)

OSTI Identifier:

1595719

Report Number(s):

arXiv:1602.06198
Journal ID: ISSN 1029-8479; TRN: US2101780

Grant/Contract Number:  

SC0009924; DEC-2014/15/B/ST2/02157; AC02-06CH11357; FG02-13ER41958; PHYS-1066293

Resource Type:

Accepted Manuscript

Journal Name:

Journal of High Energy Physics (Online)

Additional Journal Information:

Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 5; Journal ID: ISSN 1029-8479

Publisher:

Springer Berlin

Country of Publication:

United States

Language:

English

Subject:

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Higgs Physics; Supersymmetric Standard Model; Atlas Detector; B Quarks; CMS Detector; Gev Range 100-1000; Higgs Bosons; Higgs Model; Particle Decay; Particle Production; Standard Model; Supersymmetry; T Quarks