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 / 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, S., Barrett, M., Baudot, J., Bauer, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 108:11(2023). [10.1103/PhysRevD.108.L111104]

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

Aloisio A.;Campajola M.;De Nardo G.;Di Capua F.;Gaudino G.;Giordano R.;Merola M.;Mirra M.;Pardi S.;Russo Guido;
2023

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
Search for a long-lived spin-0 mediator in b →s transitions at the Belle II experiment / 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, S., Barrett, M., Baudot, J., Bauer, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 108:11(2023). [10.1103/PhysRevD.108.L111104]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/968978
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