Probing dark sectors with long-lived particles at Belle II

• Verfasst von: Filimonova, Anastasiia [VerfasserIn]
• Verfasst von: Schäfer, Ruth [VerfasserIn]
• Verfasst von: Westhoff, Susanne [VerfasserIn]
• Titel: Probing dark sectors with long-lived particles at Belle II
• Verf.angabe: Anastasiia Filimonova, Ruth Schäfer, and Susanne Westhoff
• E-Jahr: 2020
• Jahr: 7 May 2020
• Umfang: 7 S.
• Fussnoten: Gesehen am 27.05.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2020
• Band/Heft Quelle: 101(2020,9) Artikel-Nummer 095006, 7 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.101.095006
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1698875533

Abstract

We propose a new search for light scalar singlets in rare meson decays. For couplings well below the electroweak interaction strength, the scalar is long-lived at detector scales and decays into displaced pairs of leptons or light mesons. We show that Belle II has a remarkable potential to probe scalars in the GeV range with couplings as small as 10−5. The predicted sensitivity is higher than at the long-baseline experiments NA62 and FASER and comparable with projections for FASER 2. We also investigate signatures of invisibly decaying scalars in rare meson decays with missing energy.