Evidence for the decay $B^0\to J/ψω$ and measurement of the relative branching fractions of $B^0_s$ meson decays to $J/ψη$ and $J/ψη^{'}$
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Beteta, C. Abellan
name: Adametz, A.
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
name: Affolder, A.
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name: Alessio, F.
name: Alexander, M.
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amhis, Y.
name: Anderlini, L.
name: Anderson, J.
name: Appleby, R. B.
name: Gutierrez, O. Aquines
name: Archilli, F.
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Bachmann, S.
name: Back, J. J.
name: Baesso, C.
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name: Bauer, Th.
name: Bay, A.
name: Beddow, J.
name: Bediaga, I.
name: Belogurov, S.
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name: Belyaev, I.
name: Ben-Haim, E.
name: Benayoun, M.
name: Bencivenni, G.
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name: Benton, J.
name: Berezhnoy, A.
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name: van Beuzekom, M.
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name: Bozzi, C.
name: Brambach, T.
name: Brand, J. van den
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name: Akiba, K. Carvalho
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Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: First evidence of the $B^0\to J/ψω$ decay is found and the $B_{s}^0\to J/ψη$ and $B_{s}^0\to J/ψη^{\prime}$ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$ TeV. The branching fractions of these decays are measured relative to that of the $\mathrm{B}^0\to J/ψρ^0$ decay: $$\frac{Br(B^0\to J/ψω)}{Br(B^0\to J/ψρ^0)} = 0.89 \pm0.19(stat)^{+0.07}_{-0.13}(syst)$$ $$\frac{Br(B^0_s\to J/ψη)}{Br(B^0\to J/ψρ^0)} = 14.0 \pm 1.2(stat)^{+1.1}_{-1.5}(syst)^{+1.1}_{-1.0}(\frac{f_d}{f_s}),$$ $$\frac{Br(B^0_s\to J/ψη^{\prime})}{Br(B^0\to J/ψρ^0)} = 12.7\pm1.1(stat)^{+0.5}_{-1.3}(syst)^{+1.0}_{-0.9}(\frac{f_d}{f_s}),$$ where the last uncertainty is due to the knowledge of $f_d/f_s$, the ratio of b-quark hadronization factors that accounts for the different production rate of $B^0$ and $B^0_s$ mesons. The ratio of the branching fractions of $B^0_s\to J/ψη^{\prime}$ and $B^0_s\to J/ψη$ decays is measured to be $$ \frac{Br(B^0_s\to J/ψη^{\prime})}{Br(B^0_s\to J/ψη)} = 0.90\pm0.09(stat)^{+0.06}_{-0.02}(syst).$$
description: 23 pages, 7 figures