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First observation of the decay Bs0_{s}^{0} → KS0_{S}^{0} K∗^{∗}(892)0^{0} at LHCb

Collaboration
Jul 2, 2015
19 pages
Published in:
  • JHEP 01 (2016) 012
  • Published: Jan 4, 2016
e-Print:
DOI:
Report number:
  • CERN-PH-EP-2015-144,
  • LHCB-PAPER-2015-018
Experiments:
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Abstract: (Springer)
A search for B(s)0→KS0K∗(892)0B_{(s)}^{0} \to K_{S}^{0} K^{*}(892)^{0} decays is performed using pppp collision data, corresponding to an integrated luminosity of 1.0 fb−11.0~\text{fb}^{-1}, collected with the LHCb detector at a centre-of-mass energy of 7 TeV7~\text{TeV}. The Bs0→KS0K∗(892)0B_{s}^{0} \to K_{S}^{0} K^{*}(892)^{0} decay is observed for the first time, with a significance of 7.1 standard deviations. The branching fraction is measured to be \begin{equation*} \mathcal{B}(B_{s}^{0} \to \bar{K}^{0} K^{*}(892)^{0}) + \mathcal{B}(B_{s}^{0} \to K^{0} \bar{K}^{*}(892)^{0}) = (16.4 \pm 3.4 \pm 2.3) \times 10^{-6},\\ \end{equation*} where the first uncertainty is statistical and the second is systematic. No evidence is found for the decay B0→KS0K∗(892)0B^{0} \to K_{S}^{0} K^{*}(892)^{0} and an upper limit is set on the branching fraction, B(B0→Kˉ0K∗(892)0)+B(B0→K0Kˉ∗(892)0)<0.96 ×10−6,\mathcal{B}(B^{0} \to \bar{K}^{0} K^{*}(892)^{0}) + \mathcal{B}(B^{0} \to K^{0} \bar{K}^{*}(892)^{0}) < 0.96 \ \times 10^{-6}, at 90 %90\,\% confidence level. All results are consistent with Standard Model predictions.
Note:
  • Hadron-Hadron scattering
  • B physics
  • p p: scattering
  • p p: colliding beams
  • B/s0: hadronic decay
  • B0: hadronic decay
  • B/s0: branching ratio: measured
  • B0: branching ratio: upper limit
  • statistical
  • LHC-B
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