First observation of the decay B0s -> K*0 anti-K*0 - Archive ouverte HAL Access content directly
Journal Articles Physics Letters B Year : 2012

First observation of the decay B0s -> K*0 anti-K*0

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R. Young
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O. Yushchenko
  • Function : Author
M. Zavertyaev
  • Function : Author
F. Zhang
L. Zhang
W. C. Zhang
  • Function : Author
Y. Zhang
  • Function : Author
A. Zhelezov
  • Function : Author
L. Zhong
  • Function : Author
E. Zverev
  • Function : Author
A. Zvyagin
  • Function : Author

Abstract

The first observation of the decay Bs0 -> K*0 anti-K*0 is reported using 35 pb^{-1} of data collected by LHCb in proton-proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8 \pm 7.5 signal events are observed, with a significance of 10.9 sigma. The branching fraction and the CP-averaged K*0 longitudinal polarization fraction are measured to be BR(Bs0 -> K*0 anti-K*0) = (2.81 \pm 0.46 (stat.) \pm 0.45 (syst.) \pm 0.34 (f_s/f_d))x10^{-5} and f_L = 0.31 \pm 0.12 (stat.) \pm 0.04 (syst.).

Dates and versions

in2p3-00642652 , version 1 (18-11-2011)

Identifiers

Cite

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, et al.. First observation of the decay B0s -> K*0 anti-K*0. Physics Letters B, 2012, 709, pp.50-58. ⟨10.1016/j.physletb.2012.02.001⟩. ⟨in2p3-00642652⟩
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