The ratio of branching fractions R(D∗)=B(B→D∗τ-ντ)/B(B→D∗-ν), where is an electron or muon, is measured using a Belle II data sample with an integrated luminosity of 189 fb-1 at the SuperKEKB asymmetric-energy e+e-collider. Data is collected at the I(4S) resonance, and one B meson in the I(4S)→BB decay is fully reconstructed in hadronic decay modes. The accompanying signal B meson is reconstructed as B→D∗τ-ντ using leptonic τ decays. The normalization decay, B→D∗-ν, produces the same observable final-state particles. The ratio of branching fractions is extracted in a simultaneous fit to two signal-discriminating variables in both channels and yields R(D∗)=0.262-0.039+0.041(stat)-0.032+0.035(syst). This result is consistent with the current world average and with Standard Model predictions.

Test of lepton flavor universality with a measurement of R(D*) using hadronic B tagging at the Belle II experiment / Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D. M., Atmacan, H., Aushev, T., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, Sw., Bansal, S., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 110:7(2024). [10.1103/physrevd.110.072020]

Test of lepton flavor universality with a measurement of R(D*) using hadronic B tagging at the Belle II experiment

Aloisio, A.;Campajola, M.;De Nardo, G.;Di Capua, F.;Gaudino, G.;Giordano, R.;Merola, M.;Russo, G.;
2024

Abstract

The ratio of branching fractions R(D∗)=B(B→D∗τ-ντ)/B(B→D∗-ν), where is an electron or muon, is measured using a Belle II data sample with an integrated luminosity of 189 fb-1 at the SuperKEKB asymmetric-energy e+e-collider. Data is collected at the I(4S) resonance, and one B meson in the I(4S)→BB decay is fully reconstructed in hadronic decay modes. The accompanying signal B meson is reconstructed as B→D∗τ-ντ using leptonic τ decays. The normalization decay, B→D∗-ν, produces the same observable final-state particles. The ratio of branching fractions is extracted in a simultaneous fit to two signal-discriminating variables in both channels and yields R(D∗)=0.262-0.039+0.041(stat)-0.032+0.035(syst). This result is consistent with the current world average and with Standard Model predictions.
2024
Test of lepton flavor universality with a measurement of R(D*) using hadronic B tagging at the Belle II experiment / Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D. M., Atmacan, H., Aushev, T., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, Sw., Bansal, S., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 110:7(2024). [10.1103/physrevd.110.072020]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/991906
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