Aad, G;
Abbott, B;
Abdallah, J;
Abdinov, O;
Aben, R;
Abolins, M;
AbouZeid, OS;
... Zwalinski, L; + view all
(2016)
Study of the B-c(+) -> J/psi D-s(+) and Bc(+) -> J/psi D-s*(+) decays with the ATLAS detector.
European Physical Journal C
, 76
(4)
10.1140/epjc/s10052-015-3743-8.
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Abstract
The decays B+c→J/ψD+sBc+→J/ψDs+ and B+c→J/ψD∗+sBc+→J/ψDs∗+ are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb −1−1 of pp collisions collected at centre-of-mass energies s√=7s=7 TeV and 8 TeV, respectively. Signal candidates are identified through J/ψ→μ+μ−J/ψ→μ+μ− and D(∗)+s→ϕπ+(γ/π0)Ds(∗)+→ϕπ+(γ/π0) decays. With a two-dimensional likelihood fit involving the B+cBc+ reconstructed invariant mass and an angle between the μ+μ+ and D+sDs+ candidate momenta in the muon pair rest frame, the yields of B+c→J/ψD+sBc+→J/ψDs+ and B+c→J/ψD∗+sBc+→J/ψDs∗+ , and the transverse polarisation fraction in B+c→J/ψD∗+sBc+→J/ψDs∗+ decay are measured. The transverse polarisation fraction is determined to be Γ±±(B+c→J/ψD∗+s)/Γ(B+c→J/ψD∗+s)=0.38±0.23±0.07Γ±±(Bc+→J/ψDs∗+)/Γ(Bc+→J/ψDs∗+)=0.38±0.23±0.07 , and the derived ratio of the branching fractions of the two modes is BB+c→J/ψD∗+s/BB+c→J/ψD+s=2.8+1.2−0.8±0.3BBc+→J/ψDs∗+/BBc+→J/ψDs+=2.8−0.8+1.2±0.3 , where the first error is statistical and the second is systematic. Finally, a sample of B+c→J/ψπ+Bc+→J/ψπ+ decays is used to derive the ratios of branching fractions BB+c→J/ψD+s/BB+c→J/ψπ+=3.8±1.1±0.4±0.2BBc+→J/ψDs+/BBc+→J/ψπ+=3.8±1.1±0.4±0.2 and BB+c→J/ψD∗+s/BB+c→J/ψπ+=10.4±3.1±1.5±0.6BBc+→J/ψDs∗+/BBc+→J/ψπ+=10.4±3.1±1.5±0.6 , where the third error corresponds to the uncertainty of the branching fraction of D+s→ϕ(K+K−)π+Ds+→ϕ(K+K−)π+ decay. The available theoretical predictions are generally consistent with the measurement.
| Type: | Article |
|---|---|
| Title: | Study of the B-c(+) -> J/psi D-s(+) and Bc(+) -> J/psi D-s*(+) decays with the ATLAS detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s10052-015-3743-8 |
| Publisher version: | http://doi.org/10.1140/epjc/s10052-015-3743-8 |
| Language: | English |
| Additional information: | Copyright © 2017 CERN for the benefit of the ATLAS collaboration. This open access article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecomm ons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP. The final publication is available at Springer via http://doi.org/10.1140/epjc/s10052-015-3743-8 |
| Keywords: | Science & Technology, Physical Sciences, Physics, Particles & Fields, Physics, B-c Meson, Collisions, States, Tev |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1477719 |
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