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Two Higgs bosons near 125 GeV in the NMSSM: beyond the narrow width approximation

Two Higgs bosons near 125 GeV in the NMSSM: beyond the narrow width approximation
Two Higgs bosons near 125 GeV in the NMSSM: beyond the narrow width approximation
In the next-to-minimal supersymmetric Standard Model (NMSSM), it is possible for either one of the additional singlet-like scalar and pseudoscalar Higgs bosons to be almost degenerate in mass with the ~125 GeV SM-like Higgs state. In the real NMSSM (rNMSSM), when the mass difference between two scalar states is comparable to their individual total decay widths, the quantum mechanical interference, due to the relevant diagonal as well as off-diagonal terms in the propagator matrix, between them can become sizable. This possibility invalidates usage of the narrow width approximation (NWA) to compute the cross section for the production of a di-photon pair with a given invariant mass via resonant Higgs boson(s) in the gluon fusion process at the Large Hadron Collider (LHC). When, motivated by the baryon asymmetry of the universe, CP-violating (CPV) phases are explicitly invoked in the Higgs sector of the NMSSM, all the interaction eigenstates mix to give five CP-indefinite physical Higgs bosons. In this scenario, the interference effects due the off-diagonal terms in the Higgs mass matrix that mix the pseudoscalar-like state with the SM-like one can also become significant, when these two are sufficiently mass-degenerate. We perform a detailed analysis, in both the real and complex NMSSM, of these interference effects, when the full propagator matrix is taken into account, in the production of a photon pair with an invariant mass near 125 GeV through gluon fusion. We find that these effects can account for up to ~40% of the total cross section for certain model parameter configurations. We also investigate how such mutually interfering states contributing to the ~125 GeV signal observed at the LHC can be distinguished from a single resonance.
hep-ph
1434-6044
Das, Biswaranjan
94f55af2-f7e1-4853-b746-66bd93ca88e7
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Munir, Shoaib
9e440f1d-64a4-4f6c-9b55-6c13bb544dcd
Poulose, Poulose
e2f63de5-c800-4be5-8958-14072cfbcfeb
Das, Biswaranjan
94f55af2-f7e1-4853-b746-66bd93ca88e7
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Munir, Shoaib
9e440f1d-64a4-4f6c-9b55-6c13bb544dcd
Poulose, Poulose
e2f63de5-c800-4be5-8958-14072cfbcfeb

Das, Biswaranjan, Moretti, Stefano, Munir, Shoaib and Poulose, Poulose (2017) Two Higgs bosons near 125 GeV in the NMSSM: beyond the narrow width approximation. The European Physical Journal C, 77, [544]. (doi:10.1140/epjc/s10052-017-5096-y).

Record type: Article

Abstract

In the next-to-minimal supersymmetric Standard Model (NMSSM), it is possible for either one of the additional singlet-like scalar and pseudoscalar Higgs bosons to be almost degenerate in mass with the ~125 GeV SM-like Higgs state. In the real NMSSM (rNMSSM), when the mass difference between two scalar states is comparable to their individual total decay widths, the quantum mechanical interference, due to the relevant diagonal as well as off-diagonal terms in the propagator matrix, between them can become sizable. This possibility invalidates usage of the narrow width approximation (NWA) to compute the cross section for the production of a di-photon pair with a given invariant mass via resonant Higgs boson(s) in the gluon fusion process at the Large Hadron Collider (LHC). When, motivated by the baryon asymmetry of the universe, CP-violating (CPV) phases are explicitly invoked in the Higgs sector of the NMSSM, all the interaction eigenstates mix to give five CP-indefinite physical Higgs bosons. In this scenario, the interference effects due the off-diagonal terms in the Higgs mass matrix that mix the pseudoscalar-like state with the SM-like one can also become significant, when these two are sufficiently mass-degenerate. We perform a detailed analysis, in both the real and complex NMSSM, of these interference effects, when the full propagator matrix is taken into account, in the production of a photon pair with an invariant mass near 125 GeV through gluon fusion. We find that these effects can account for up to ~40% of the total cross section for certain model parameter configurations. We also investigate how such mutually interfering states contributing to the ~125 GeV signal observed at the LHC can be distinguished from a single resonance.

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More information

Accepted/In Press date: 20 July 2017
e-pub ahead of print date: 14 August 2017
Published date: August 2017
Additional Information: First available on ArXiv on 10 Apr 2017
Keywords: hep-ph

Identifiers

Local EPrints ID: 413534
URI: http://eprints.soton.ac.uk/id/eprint/413534
ISSN: 1434-6044
PURE UUID: 539971cf-6320-4d28-808e-e7e34be5cf2a

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Date deposited: 25 Aug 2017 16:31
Last modified: 21 Nov 2021 08:15

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Contributors

Author: Biswaranjan Das
Author: Stefano Moretti
Author: Shoaib Munir
Author: Poulose Poulose

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