The bottomonium spectrum, consisting of bound states of a b quark and an anti-b quark, provides an excellent laboratory for probing quantum chromodynamics in the non-perturbative regime. While S and P-wave bottomonium states are well studied experimentally, information on D-wave states remains scarce. We search for the D-wave bottomonium states Υ2(1D) and Υ3(1D) via the decay of a vector bottomonium-like state Υ(10753) in the reaction e+e− → π+π−Υ(1D), using 19.6 fb−1 of data collected with the Belle II detector at center-of-mass energies, 10.701, 10.745, and 10.805 GeV, in the vicinity of the Υ(10753) resonance. No significant signals are observed. We set upper limits at the 90% credibility level on the products of the cross sections and branching fractions, σ[e+e− → π+π−Υ2(1D)] × ℬ(Υ2(1D) → γχb1) and σ[e+e− → π+π−Υ3(1D)] × ℬ(Υ3(1D) → γχb2), at each center-of-mass energy.

Study of e+e− → π+π−Υ(1D) at Belle II

Antonioli, C.;Gaz, A.;Stroili, R.;
2026

Abstract

The bottomonium spectrum, consisting of bound states of a b quark and an anti-b quark, provides an excellent laboratory for probing quantum chromodynamics in the non-perturbative regime. While S and P-wave bottomonium states are well studied experimentally, information on D-wave states remains scarce. We search for the D-wave bottomonium states Υ2(1D) and Υ3(1D) via the decay of a vector bottomonium-like state Υ(10753) in the reaction e+e− → π+π−Υ(1D), using 19.6 fb−1 of data collected with the Belle II detector at center-of-mass energies, 10.701, 10.745, and 10.805 GeV, in the vicinity of the Υ(10753) resonance. No significant signals are observed. We set upper limits at the 90% credibility level on the products of the cross sections and branching fractions, σ[e+e− → π+π−Υ2(1D)] × ℬ(Υ2(1D) → γχb1) and σ[e+e− → π+π−Υ3(1D)] × ℬ(Υ3(1D) → γχb2), at each center-of-mass energy.
2026
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3615571
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