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Title: Heavy Higgs boson decays in the alignment limit of the 2HDM

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]; ORCiD logo [4]
  1. Univ. of Warsaw (Poland)
  2. Univ. of California, Santa Cruz, CA (United States)
  3. Western Norway Univ. of Applied Sciences, Bergen (Norway)
  4. Univ. of Bergen (Norway)

The Standard Model (SM)-like couplings of the observed Higgs boson impose strong constraints on the structure of any extended Higgs sector. We consider the theoretical properties and the phenomenological implications of a generic two Higgs doublet model (2HDM). This model constitutes a simple and attractive extension of the SM that is consistent with the observation of the SM-like Higgs boson and precision electroweak observables, while providing a potential new source of CP-violation. In this paper we focus on the so-called Higgs alignment limit of the generic 2HDM, where the neutral scalar field H1, with the tree-level couplings of the SM Higgs boson, is a mass eigenstate that is aligned in field space with the direction of the Higgs vacuum expectation value. Tihe properties of the two other heavier neutral Higgs scalars, H2 and H3, in the alignment limit of the 2HDM are also elucidated. It is shown that the couplings of H2 and H3 in the alignment limit are tightly constrained and correlated. For example, in the exact alignment limit at tree level, for bosonic final states BR(H2,3W+W-, ZZ, H1Z) = 0 and BR(H±W±H1) = 0, whereas for fermionic final states Γ(H2ff¯)/Γ(H3ff¯) ~ M2/M3 (where Mα is the mass of Hα). In some cases, the results of the alignment limit differ depending on whether or not alignment is achieved via the decoupling of heavy scalar states. In particular, in the exact alignment limit without decoupling BR(H2,3H1H1) = 0, whereas these branching ratios are nonzero in the decoupling regime. Observables that could be used to test the alignment scenario at the LHC are defined and discussed. The couplings of the Higgs bosons away from their exact alignment values are determined to leading order, and some consequences are elucidated.

Research Organization:
Univ. of California, Santa Cruz, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Centre Poland
Grant/Contract Number:
SC0010107; 645722; UMO-2015/18/M/ST2/00518
OSTI ID:
1611343
Journal Information:
Journal of High Energy Physics (Online), Vol. 2018, Issue 12; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (15)

Alignment limit in three Higgs-doublet models journal August 2019
LHC bounds on colored scalars journal December 2019
Relaxed constraints on the heavy scalar masses in 2HDM journal September 2019
Dirac neutrinos in the 2HDM with restrictive Abelian symmetries journal December 2019
The Grimus–Neufeld Model with FlexibleSUSY at One-Loop journal November 2019
Charged Higgs bosons in naturally aligned two-Higgs-doublet models at the LHC journal August 2019
Lepton number violation in heavy Higgs boson decays to sneutrinos journal January 2020
Quartic coupling unification in the maximally symmetric 2HDM journal June 2019
Muon g 2 in a U ( 1 ) -symmetric two-Higgs-doublet model journal February 2019
Charged Higgs Bosons in Naturally Aligned Two Higgs Doublet Models at the LHC text January 2019
Charged Higgs Bosons in Naturally Aligned Two Higgs Doublet Models at the LHC text January 2018
Dirac neutrinos in the 2HDM with restrictive Abelian symmetries text January 2019
LHC bounds on coloured scalars text January 2019
Alignment limit in three Higgs-doublet models text January 2019
Kinematic corrections and reconstruction methods for neutral Higgs boson decay to $b\bar{b}$ in 2HDM type-I at future lepton colliders text January 2021

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