Publication

Measurement of the B-s(0) -> J/psi (K)over-bar(*0) branching fraction and angular amplitudes

Olivier Schneider, Aurelio Bay, Guido Haefeli, Tatsuya Nakada, Frédéric Blanc, Yasmine Sara Amhis, Julien Rouvinet, Barinjaka Rakotomiaramanana, Raluca Anca Muresan, Johan Luisier, Anne Keune, Vincent Fave, Hubert Degaudenzi, Mathias Oleg Knecht
2012
Journal Articles

Abstract

A sample of 114 +/- 11 B-s(0) -> J/psi K- pi(+) signal events obtained with 0.37 fb(-1) of pp collisions at root s = 7 TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes of the B-s(0) -> J/psi(K) over bar*(0) decay, with (K) over bar*(0) -> K- pi(+). The K- pi(+) mass spectrum of the candidates in the B-s(0) peak is dominated by the (K) over bar*(0) contribution. Subtracting the nonresonant K- pi(+) component, the branching fraction of B-s(0) -> J/pi (K) over bar*(0) is (4.4(-0.4)(+0.5) +/- 0.8) x 10(-5), where the first uncertainty is statistical and the second is systematic. A fit to the angular distribution of the decay products yields the K*(0) polarization fractions f(L) = 0.50 +/- 0.08 +/- 0.02 and f(parallel to) = 0.19(-0.08)(+0.10) +/- 0.02.

Official source

https://infoscience.epfl.ch/entities/publication/0ad4544c-74e7-40ac-b2f3-322fafb203a7

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Measurement of the B-s(0) -> J/psi (K)over-bar(*0) branching fraction and angular amplitudes

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Branching fraction measurement of the decay B+→ψ(2S)ϕ(1020)K+

Observation of the ${{{\varLambda } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} {{K} ^+} }$ and ${{{{\varXi } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} {{\pi } ^+} }}$ decays

Search for the Double Dalitz Decays η/η' →e + e -μ +μ - and η'→μ+μ-μ+μ-