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 ϒ(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

Bettarini, S.;Casarosa, G.;Corona, L.;De Nuccio, M.;De Pietro, G.;Forti, F.;Martini, A.;Massaccesi, L.;Mondal, S.;Moneta, S.;Paladino, A.;Paoloni, E.;Rizzo, G.;Tenchini, F.;Zani, L.;
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 ϒ(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
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/11568/1216556
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