The "forgotten" decay S → Zh as a CP analyzer

• Verfasst von: Bauer, Martin [VerfasserIn]
• Verfasst von: Neubert, Matthias [VerfasserIn]
• Verfasst von: Thamm, Andrea [VerfasserIn]
• Titel: The "forgotten" decay S → Zh as a CP analyzer
• Verf.angabe: Martin Bauer, Matthias Neubert, and Andrea Thamm
• Fussnoten: Gesehen am 10.01.2018
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2016
• Band/Heft Quelle: (2016) Artikel-Nummer 1607.01016, 6 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 156701805X

Abstract

Scalar particles $S$ which are gauge singlets under the Standard Model are generic features of many models of fundamental physics, in particular as possible mediators to a hidden or dark sector. We show that the decay $S\to Zh$ provides a powerful probe of the CP nature of the scalar, because it is allowed only if $S$ has CP-odd interactions. We perform a model-independent analysis of this decay in the context of an effective Lagrangian and compute the relevant Wilson coefficients arising from integrating out heavy fermions to one-loop order. We illustrate our findings with the example of the 750 GeV diphoton resonance seen by ATLAS and CMS and show that the $S\to Zh$ decay rate could naturally be of similar magnitude or larger than the diphoton rate.