학술논문
Study of Bc+→J/ψDs+Bc+→J/ψDs∗+s and Bc+→J/ψDs+Bc+→J/ψDs∗+s decays in pp collisions at Bc+→J/ψDs+Bc+→J/ψDs∗+s = 13 TeV with the ATLAS detector
Document Type
Original Paper
Author
Source
Journal of High Energy Physics. 2022(8)
Subject
Language
English
ISSN
1029-8479
Abstract
Abstract: A study of Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+s and Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+s decays using 139 fb−1 of integrated luminosity collected with the ATLAS detector from Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+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 Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+s→ J/ψπ+ decay are measured: Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+s = 2.76 ± 0.47 and Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+s = 5.33 ± 0.96. The ratio of the branching fractions of the two decays is found to be Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+s = 1.93 ± 0.26. For the Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+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 Bc+→J/ψDs+Bc+→J/ψDs∗+sBc+BBc+→J/ψDs+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψπ+BBc+→J/ψDs∗+/BBc+→J/ψDs∗+Bc+→J/ψDs∗+s = 7 and 8 TeV pp collision data. A comparison with available theoretical predictions for the measured quantities is presented.