Search for a long-lived spin-0 mediator in $b{\rightarrow}s$ transitions at the Belle II experiment
Belle II Collaboration; Adachi, I.; Adamczyk, K.; Aggarwal, L.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V.; Aversano, M.; Babu, V.; Bae, H.; Bahinipati, S.; Bambade, P.; Banerjee, Sw; Barrett, M.;
Abstract:
Additional spin-0 particles appear in many extensions of the standard model. We search for long-lived
spin-0 particles S in B-meson decays mediated by a b → s quark transition in e⁺e⁻ collisions at the ϒð(4S)
resonance at the Belle II experiment. Based on a sample corresponding to an integrated luminosity of
189 fb⁻¹, we observe no evidence for signal. We set model-independent upper limits on the product of
branching fractions Β(Β$^0$ → K$^*$(892)$^0$(→ K⁺π⁻)S) × B(S → x⁺x⁻) and B(B⁺ → K⁺S) × B(S → x⁺x⁻),
where x⁺x⁻ indicates e⁺e⁻; μ⁺μ⁻; π⁺π⁻, or K⁺K⁻, as functions of S mass and lifetime at the level of 10⁻⁷.
spin-0 particles S in B-meson decays mediated by a b → s quark transition in e⁺e⁻ collisions at the ϒð(4S)
resonance at the Belle II experiment. Based on a sample corresponding to an integrated luminosity of
189 fb⁻¹, we observe no evidence for signal. We set model-independent upper limits on the product of
branching fractions Β(Β$^0$ → K$^*$(892)$^0$(→ K⁺π⁻)S) × B(S → x⁺x⁻) and B(B⁺ → K⁺S) × B(S → x⁺x⁻),
where x⁺x⁻ indicates e⁺e⁻; μ⁺μ⁻; π⁺π⁻, or K⁺K⁻, as functions of S mass and lifetime at the level of 10⁻⁷.
| Zugehörige Institution(en) am KIT | Institut für Experimentelle Teilchenphysik (ETP) |
| Publikationstyp | Zeitschriftenaufsatz |
| Publikationsmonat/-jahr | 12.2023 |
| Sprache | Englisch |
| Identifikator | ISSN: 2470-0010, 2470-0029 KITopen-ID: 1000183405 |
| Erschienen in | Physical Review D |
| Band | 108 |
| Heft | 11 |
| Seiten | Art.-Nr.: L111104 |
| Vorab online veröffentlicht am | 21.12.2023 |
| Nachgewiesen in | Dimensions Scopus Web of Science OpenAlex |
| Globale Ziele für nachhaltige Entwicklung |