Study of Bc+→J/ψDs+ and Bc+→J/ψDs∗+ decays in pp collisions at √s = 13 TeV with the ATLAS detector
Journal
Journal of High Energy Physics
Date Issued
2022-08-01
Author(s)
Aad, G.
Abbott, B.
Abbott, D. C.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D. K.
Abidi, S. H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Abusleme Hoffman, A. C.
Acharya, B. S.
Achkar, B.
Adam, L.
Adam Bourdarios, C.
Adamczyk, L.
Adamek, L.
Addepalli, S. V.
Adelman, J.
Adiguzel, A.
Adorni, S.
Adye, T.
Affolder, A. A.
Afik, Y.
Agapopoulou, C.
Agaras, M. N.
Agarwala, J.
Aggarwal, A.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahmad, A.
Ahmadov, F.
Ahmed, W. S.
Ai, X.
Aielli, G.
Aizenberg, I.
Akatsuka, S.
Akbiyik, M.
Åkesson, T. P.A.
Akimov, A. V.
Al Khoury, K.
Alberghi, G. L.
Albert, J.
Albicocco, P.
Alconada Verzini, M. J.
Alderweireldt, S.
Aleksa, M.
Aleksandrov, I. N.
Alexa, C.
Alexopoulos, T.
Alfonsi, A.
Alfonsi, F.
Alhroob, M.
Ali, B.
Ali, S.
Aliev, M.
Alimonti, G.
Allaire, C.
Allbrooke, B. M.M.
Allport, P. P.
Aloisio, A.
Alonso, F.
Alpigiani, C.
Alunno Camelia, E.
Alvarez Estevez, M.
Alviggi, M. G.
Amaral Coutinho, Y.
Ambler, A.
Ambroz, L.
Amelung, C.
Amidei, D.
Amor Dos Santos, S. P.
Amoroso, S.
Amos, K. R.
Amrouche, C. S.
Ananiev, V.
Anastopoulos, C.
Andari, N.
Andeen, T.
Anders, J. K.
Andrean, S. Y.
Andreazza, A.
Angelidakis, S.
Angerami, A.
Anisenkov, A. V.
Annovi, A.
Antel, C.
Anthony, M. T.
Antipov, E.
Antonelli, M.
Antrim, D. J.A.
Anulli, F.
Aoki, M.
Aparisi Pozo, J. A.
C. M. Robles Gajardo
DOI
10.1007/JHEP08(2022)087
Abstract
A study of B+
c → J/ψD+
s and B+
c → J/ψD∗+
s decays using 139 fb−1 of integrated luminosity collected with the ATLAS detector from √
s = 13 TeV pp collisions
at the LHC is presented. The ratios of the branching fractions of the two decays to the
branching fraction of the B+
c → J/ψπ+ decay are measured: B(B+
c → J/ψD+
s
)/B(B+
c →
J/ψπ+) = 2.76 ± 0.47 and B(B+
c → J/ψD∗+
s
)/B(B+
c → J/ψπ+) = 5.33 ± 0.96. The ratio
of the branching fractions of the two decays is found to be B(B+
c → J/ψD∗+
s
)/B(B+
c →
J/ψD+
s
) = 1.93 ± 0.26. For the B+
c → J/ψD∗+
s decay, the transverse polarization fraction,
Γ±±/Γ, is measured to be 0.70 ± 0.11. The reported uncertainties include both the statistical and systematic components added in quadrature. The precision of the measurements
exceeds that in all previous studies of these decays. These results supersede those obtained
in the earlier ATLAS study of the same decays with √
s = 7 and 8 TeV pp collision data. A
comparison with available theoretical predictions for the measured quantities is presented.
c → J/ψD+
s and B+
c → J/ψD∗+
s decays using 139 fb−1 of integrated luminosity collected with the ATLAS detector from √
s = 13 TeV pp collisions
at the LHC is presented. The ratios of the branching fractions of the two decays to the
branching fraction of the B+
c → J/ψπ+ decay are measured: B(B+
c → J/ψD+
s
)/B(B+
c →
J/ψπ+) = 2.76 ± 0.47 and B(B+
c → J/ψD∗+
s
)/B(B+
c → J/ψπ+) = 5.33 ± 0.96. The ratio
of the branching fractions of the two decays is found to be B(B+
c → J/ψD∗+
s
)/B(B+
c →
J/ψD+
s
) = 1.93 ± 0.26. For the B+
c → J/ψD∗+
s decay, the transverse polarization fraction,
Γ±±/Γ, is measured to be 0.70 ± 0.11. The reported uncertainties include both the statistical and systematic components added in quadrature. The precision of the measurements
exceeds that in all previous studies of these decays. These results supersede those obtained
in the earlier ATLAS study of the same decays with √
s = 7 and 8 TeV pp collision data. A
comparison with available theoretical predictions for the measured quantities is presented.
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