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Measurement of the energy dependence of the e+e− → $$ B\overline{B} $$, $$ B{\overline{B}}^{\ast } $$, and $$ {B}^{\ast }{\overline{B}}^{\ast } $$ cross sections at Belle II

https://doi.org/10.1007/JHEP10(2024)114

Adachi, I; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Althubiti, N; Anh_Ky, N; Asner, D M; Atmacan, H; et al (October 2024, Journal of High Energy Physics)

A<sc>bstract</sc> We report measurements of thee⁺e⁻→$$ B\overline{B} $$

B \bar{B}

,$$ B{\overline{B}}^{\ast } $$

B {\bar{B}}^{*}

, and$$ {B}^{\ast }{\overline{B}}^{\ast } $$

B^{*} {\bar{B}}^{*}

cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected by the Belle II experiment. We reconstruct oneBmeson in a large number of hadronic final states and use its momentum to identify the production process. In the first 2 – 5 MeV above$$ {B}^{\ast }{\overline{B}}^{\ast } $$

B^{*} {\bar{B}}^{*}

threshold, thee⁺e⁻→$$ {B}^{\ast }{\overline{B}}^{\ast } $$

B^{*} {\bar{B}}^{*}

cross section increases rapidly. This may indicate the presence of a pole close to the threshold.

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