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 δ(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 B(B0→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.

Search for a long-lived spin-0 mediator in b → s transitions at the Belle II experiment

Bianchi, F.;Das, S.;Destefanis, M.;Maggiora, M.;Spataro, S.;
2023-01-01

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 δ(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 B(B0→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.
2023
108
11
L111104-1
L111104-7
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.108.L111104
Extensions of scalar sector, Particle dark matter, Rare decays, Signatures with light leptons, Axion-like particles, Bottom quark, Hypothetical scalars, Lepton colliders, Particle data analysis
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, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2069013
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