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A light NMSSM pseudoscalar Higgs boson at the LHC redux

A light NMSSM pseudoscalar Higgs boson at the LHC redux
A light NMSSM pseudoscalar Higgs boson at the LHC redux
The Next-to-Minimal Supersymmetric Standard Model (NMSSM) contains a singlet-like pseudoscalar Higgs boson in addition to the doublet-like pseudoscalar of the Minimal Supersymmetric Standard Model. This new pseudoscalar can have a very low mass without violating the LEP exclusion constraints and it can potentially provide a hallmark signature of non-minimal supersymmetry at the LHC. In this analysis we revisit the light pseudoscalar in the NMSSM with partial universality at some high unification scale. We delineate the regions of the model’s parameter space that are consistent with the up-to-date theoretical and experimental constraints, from both Higgs boson searches and elsewhere (most notably b-physics), and examine to what extent they can be probed by the LHC. To this end we review the most important production channels of such a Higgs state and assess the scope of its observation at the forthcoming Run-2 of the LHC. We conclude that the bb¯¯-associated production of the pseudoscalar, which has been emphasised in previous studies, does not carry much promise anymore, given the measured mass of the Higgs boson at the LHC. However, the decays of one of the heavier scalar Higgs bosons of the NMSSM can potentially lead to the discovery of its light pseudoscalar. Especially promising are the decays of one or both of the two lightest scalar states into a pseudoscalar pair and of the heaviest scalar into a pseudoscalar and a Z boson. Since the latter channel has not been explored in detail in the literature so far, we provide details of some benchmark points which can be probed for establishing its signature.
1-32
Bomark, N.-E.
a742c083-7042-4dc1-a746-95bf64299b4a
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Munir, S.
1cc7db7a-fc80-47fe-a59c-e75c1ff7e776
Roszkowski, L.
c2e7e7e7-a3f9-4d23-872b-564921be6677
Bomark, N.-E.
a742c083-7042-4dc1-a746-95bf64299b4a
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Munir, S.
1cc7db7a-fc80-47fe-a59c-e75c1ff7e776
Roszkowski, L.
c2e7e7e7-a3f9-4d23-872b-564921be6677

Bomark, N.-E., Moretti, S., Munir, S. and Roszkowski, L. (2015) A light NMSSM pseudoscalar Higgs boson at the LHC redux. Journal of High Energy Physics, 2015 (44), 1-32. (doi:10.1007/JHEP02(2015)044).

Record type: Article

Abstract

The Next-to-Minimal Supersymmetric Standard Model (NMSSM) contains a singlet-like pseudoscalar Higgs boson in addition to the doublet-like pseudoscalar of the Minimal Supersymmetric Standard Model. This new pseudoscalar can have a very low mass without violating the LEP exclusion constraints and it can potentially provide a hallmark signature of non-minimal supersymmetry at the LHC. In this analysis we revisit the light pseudoscalar in the NMSSM with partial universality at some high unification scale. We delineate the regions of the model’s parameter space that are consistent with the up-to-date theoretical and experimental constraints, from both Higgs boson searches and elsewhere (most notably b-physics), and examine to what extent they can be probed by the LHC. To this end we review the most important production channels of such a Higgs state and assess the scope of its observation at the forthcoming Run-2 of the LHC. We conclude that the bb¯¯-associated production of the pseudoscalar, which has been emphasised in previous studies, does not carry much promise anymore, given the measured mass of the Higgs boson at the LHC. However, the decays of one of the heavier scalar Higgs bosons of the NMSSM can potentially lead to the discovery of its light pseudoscalar. Especially promising are the decays of one or both of the two lightest scalar states into a pseudoscalar pair and of the heaviest scalar into a pseudoscalar and a Z boson. Since the latter channel has not been explored in detail in the literature so far, we provide details of some benchmark points which can be probed for establishing its signature.

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Accepted/In Press date: 27 December 2014
Published date: 6 February 2015
Organisations: Theoretical Partical Physics Group

Identifiers

Local EPrints ID: 402047
URI: http://eprints.soton.ac.uk/id/eprint/402047
PURE UUID: 30a474f9-67cf-4d9c-8282-ff211c115de9

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Date deposited: 27 Oct 2016 09:14
Last modified: 02 Dec 2019 19:52

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Contributors

Author: N.-E. Bomark
Author: S. Moretti
Author: S. Munir
Author: L. Roszkowski

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