We present measurements of the branching fractions of eight B0 → D(∗)+K-K(∗)0(S), B- → D(∗)0 K− K(*)0(S) decay channels. The results are based on data from SuperKEKB electron-positron collisions at the Y(4S) resonance collected with the Belle II detector, corresponding to an integrated luminosity of 362 fb^−1 . The event yields are extracted from fits to the distributions of the difference between expected and observed B meson energy, and are efficiency-corrected as a function of m(K− K(*)0(S) ) and m(D(∗) K(*)0(S) ) in order to avoid dependence on the decay model. These results include the first observation of B0 → D+ K− K0S , B− → D∗0 K−K0S, and B0 → D∗+ K− K0S decays and a significant improvement in the precision of the other channels compared to previous measurements. The helicity-angle distributions and the invariant mass distributions of the K − K(*)0(S) systems are compatible with quasi-two-body decays via a resonant transition with spin-parity JP = 1− for the K − K0S systems and JP = 1+ for the K− K∗0 systems. We also present measurements of the branching fractions of four B0 → D(∗)+ D-s , B− → D(∗)0 D-s decay channels with a precision compatible to the current world averages.
Adachi, I., Aggarwal, L., Aihara, H., Akopov, N., Aloisio, A., Althubiti, N., et al. (2024). Measurement of the branching fractions of $$ \overline{B} $$ → D(*)K−$$ {K}_{(S)}^{\left(\ast \right)0} $$ and $$ \overline{B} $$ → D(*)$$ {D}_s^{-} $$ decays at Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 2024(8), 1-33 [10.1007/jhep08(2024)206].
Measurement of the branching fractions of $$ \overline{B} $$ → D(*)K−$$ {K}_{(S)}^{\left(\ast \right)0} $$ and $$ \overline{B} $$ → D(*)$$ {D}_s^{-} $$ decays at Belle II
Branchini, P.Membro del Collaboration Group
;Budano, A.Membro del Collaboration Group
;Bussino, S.Membro del Collaboration Group
;De Pietro, G.Membro del Collaboration Group
;Laurenza, M.Membro del Collaboration Group
;Martellini, C.Membro del Collaboration Group
;Martini, A.Membro del Collaboration Group
;
2024-01-01
Abstract
We present measurements of the branching fractions of eight B0 → D(∗)+K-K(∗)0(S), B- → D(∗)0 K− K(*)0(S) decay channels. The results are based on data from SuperKEKB electron-positron collisions at the Y(4S) resonance collected with the Belle II detector, corresponding to an integrated luminosity of 362 fb^−1 . The event yields are extracted from fits to the distributions of the difference between expected and observed B meson energy, and are efficiency-corrected as a function of m(K− K(*)0(S) ) and m(D(∗) K(*)0(S) ) in order to avoid dependence on the decay model. These results include the first observation of B0 → D+ K− K0S , B− → D∗0 K−K0S, and B0 → D∗+ K− K0S decays and a significant improvement in the precision of the other channels compared to previous measurements. The helicity-angle distributions and the invariant mass distributions of the K − K(*)0(S) systems are compatible with quasi-two-body decays via a resonant transition with spin-parity JP = 1− for the K − K0S systems and JP = 1+ for the K− K∗0 systems. We also present measurements of the branching fractions of four B0 → D(∗)+ D-s , B− → D(∗)0 D-s decay channels with a precision compatible to the current world averages.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
