The first observation of the B0s → D*+ D*− decay and the measurement of its branching ratio relative to the B0 → D*+ D*− decay are presented. The data sample used corresponds to an integrated luminosity of 9 fb^−1 of proton-proton collisions recorded by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV between 2011 and 2018. The decay is observed with more than 10 standard deviations and the time-integrated ratio of branching fractions is determined to be {B(B0s → D*+ D*−)}/{B(B0 → D*+ D*−)} = 0.269 ± 0.032 ± 0.011 ± 0.008, where the first uncertainty is statistical, the second systematic and the third due to the uncertainty of the fragmentation fraction ratio fs/fd. The B0s → D*+ D*− branching fraction is calculated to be B(B0s → D*+ D*−) = (2.15 ± 0.26 ± 0.09 ± 0.06 ± 0.16) × 10^−4, where the fourth uncertainty is due to the B0 → D*+ D*− branching fraction. These results are calculated using the average B0s meson lifetime in simulation. Correction factors are reported for scenarios where either a purely heavy or a purely light B0s eigenstate is considered.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Observation of the B0s → D*+ D*− Decay. JOURNAL OF HIGH ENERGY PHYSICS, 2023(7), 0-18 [10.1007/jhep07(2023)119].

Observation of the B0s → D*+ D*− Decay

Carbone, A.;Ferrari, F.;Galli, D.;Manuzzi, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zucchelli, S.;
2023

Abstract

The first observation of the B0s → D*+ D*− decay and the measurement of its branching ratio relative to the B0 → D*+ D*− decay are presented. The data sample used corresponds to an integrated luminosity of 9 fb^−1 of proton-proton collisions recorded by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV between 2011 and 2018. The decay is observed with more than 10 standard deviations and the time-integrated ratio of branching fractions is determined to be {B(B0s → D*+ D*−)}/{B(B0 → D*+ D*−)} = 0.269 ± 0.032 ± 0.011 ± 0.008, where the first uncertainty is statistical, the second systematic and the third due to the uncertainty of the fragmentation fraction ratio fs/fd. The B0s → D*+ D*− branching fraction is calculated to be B(B0s → D*+ D*−) = (2.15 ± 0.26 ± 0.09 ± 0.06 ± 0.16) × 10^−4, where the fourth uncertainty is due to the B0 → D*+ D*− branching fraction. These results are calculated using the average B0s meson lifetime in simulation. Correction factors are reported for scenarios where either a purely heavy or a purely light B0s eigenstate is considered.
2023
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Observation of the B0s → D*+ D*− Decay. JOURNAL OF HIGH ENERGY PHYSICS, 2023(7), 0-18 [10.1007/jhep07(2023)119].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/952180
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