%0 Journal Article
%T Study of the B-c(+) -> J/psi D-s(+) and Bc(+) -> J/psi D-s*(+) decays with the ATLAS detector
%A ATLAS Collaboration (Aad, G. et al
%A Alvarez Piqueras, D.
%A Cabrera Urban, S.
%A Castillo Gimenez, V.
%A Costa, M. J.
%A Fernandez Martinez, P.
%A Ferrer, A.
%A Fiorini, L.
%A Fuster, J.
%A Garcia, C.
%A Garcia Navarro, J. E.
%A Gonzalez de la Hoz, S.
%A Hernandez Jimenez, Y.
%A Higon-Rodriguez, E.
%A Irles Quiles, A.
%A Jimenez Pena, J.
%A Kaci, M.
%A King, M.
%A Lacasta, C.
%A Lacuesta, V. R.
%A Marti-Garcia, S.
%A Mitsou, V. A.
%A Moles-Valls, R.
%A Oliver Garcia, E.
%A Pedraza Lopez, S.
%A Perez Garcia-Estañ, M. T.
%A Romero Adam, E.
%A Ros, E.
%A Salt, J.
%A Sanchez Martinez, V.
%A Soldevila, U.
%A Sanchez, J.
%A Torro Pastor, E.
%A Valero, A.
%A Valladolid Gallego, E.
%A Valls Ferrer, J. A.
%A Vos, M.
%J European Physical Journal C
%D 2016
%V 76
%N 1
%I Springer
%@ 1434-6044
%G English
%F ATLASCollaborationAad_etal2016
%O WOS:000370645100003
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2567), last updated on Thu, 28 Jul 2016 12:04:05 +0000
%X The decays B-c(+) -> J/psi D-s(+) and B-c(+) -> J/psi D-s*(+) are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb(-1) of pp collisions collected at centre-of-mass energies root s = 7 TeV and 8 TeV, respectively. Signal candidates are identified through J/psi -> mu(+)mu(-) and D-s(()*()+) -> phi pi(+)(gamma/pi(0)) decays. With a two-dimensional likelihood fit involving the B-c(+) reconstructed invariant mass and an angle between the mu(+) and D-s(+) candidate momenta in the muon pair rest frame, the yields of B-c(+) -> J/psi D-s(+) and B-c(+) -> J/psi D-s*(+), and the transverse polarisation fraction in B-c(+) -> J/psi D-s*(+) decay are measured. The transverse polarisation fraction is determined to be Gamma +/-+/-(B-c(+) -> J/psi D-s*(+))/Gamma(B-c(+) -> J/psi D-s*(+)) = 0.38 +/- 0.23 +/- 0.07, and the derived ratio of the branching fractions of the two modes is B-Bc+ -> J/psi D-s*+/B-Bc+ -> J/psi D-s(+) = 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/psi pi(+) decays is used to derive the ratios of branching fractions B-Bc+ -> J/psi D-s*+/B-Bc+ -> J/psi pi(+) = 3.8 +/- 1.1 +/- 0.4 +/- 0.2 and B-Bc+ -> J/psi D-s*+/B-Bc+ -> J/psi pi(+) = 10.4 +/- 3.1 +/- 1.5 +/- 0.6, where the third error corresponds to the uncertainty of the branching fraction of D-s(+) -> phi(K+ K-)pi(+) decay. The available theoretical predictions are generally consistent with the measurement.
%R 10.1140/epjc/s10052-015-3743-8
%U http://arxiv.org/abs/1507.07099
%U https://doi.org/10.1140/epjc/s10052-015-3743-8
%P 4 - 24pp