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Decay and detection of a light scalar boson mixing with the Higgs boson
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 12019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 1, article id 015018Article in journal (Refereed) Published
Abstract [en]

The simplest extension of the standard model consists in adding one singlet scalar field which mixes with the Higgs boson. O(GeV) masses of the new scalar carry strong motivation from relaxion, dark matter and inflation models. The decay of a GeV scalar is, however, notoriously difficult to address since, at this mass scale, the chiral expansion breaks down and perturbative QCD does not apply. Existing estimates of the GeV scalar decay rate disagree by several orders of magnitude. In this work, we perform a new dispersive analysis in order to strongly reduce these uncertainties and to address discrepancies in earlier results. We will update existing limits on light scalars and future experimental sensitivities which are in some cases strongly affected by the new-found decay rates. The meson form factors provided in this work, can be used to generalize our findings to non-universally coupled light scalars.

Place, publisher, year, edition, pages
2019. Vol. 99, no 1, article id 015018
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-165677DOI: 10.1103/PhysRevD.99.015018ISI: 000455365100010OAI: oai:DiVA.org:su-165677DiVA, id: diva2:1286221
Available from: 2019-02-06 Created: 2019-02-06 Last updated: 2019-02-06Bibliographically approved

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Winkler, Martin Wolfgang
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