The first observation of the Bs0 → D ∗+ D ∗− decay and the measurement of its branching ratio relative to the B 0 → 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(Bs0→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 Bs0 → D *+ D *− branching fraction is calculated to be B(Bs0→D∗+D∗−)=(2.15±0.26±0.09±0.06±0.16)×10−4, where the fourth uncertainty is due to the B 0 → D *+ D *− branching fraction. These results are calculated using the average Bs0 meson lifetime in simulation. Correction factors are reported for scenarios where either a purely heavy or a purely light Bs0 eigenstate is considered. [Figure not available: see fulltext.].

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Observation of the Bs0 → D *+ D *− decay. JOURNAL OF HIGH ENERGY PHYSICS, 2023(7) [10.1007/JHEP07(2023)119].

Observation of the Bs0 → D *+ D *− decay

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Kirsebom V. S.;Martinazzoli L.;Martinelli M.;Meloni S.;Minotti A.;Petruzzo M.;Pizzichemi M.;Salomoni M.;Shields E. B.;
2023

Abstract

The first observation of the Bs0 → D ∗+ D ∗− decay and the measurement of its branching ratio relative to the B 0 → 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(Bs0→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 Bs0 → D *+ D *− branching fraction is calculated to be B(Bs0→D∗+D∗−)=(2.15±0.26±0.09±0.06±0.16)×10−4, where the fourth uncertainty is due to the B 0 → D *+ D *− branching fraction. These results are calculated using the average Bs0 meson lifetime in simulation. Correction factors are reported for scenarios where either a purely heavy or a purely light Bs0 eigenstate is considered. [Figure not available: see fulltext.].
Articolo in rivista - Articolo scientifico
Branching fraction; Hadron-Hadron Scattering;
English
13-lug-2023
2023
2023
7
119
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Observation of the Bs0 → D *+ D *− decay. JOURNAL OF HIGH ENERGY PHYSICS, 2023(7) [10.1007/JHEP07(2023)119].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/455484
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