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Measurement of the ratio of branching fractions B(B0→K∗0γ)/B(Bs0→ϕγ)\mathcal{B}(B^0\to K^{*0}\gamma)/\mathcal{B}(B_s^0\to\phi\gamma)

Collaboration
Feb, 2012
15 pages
Published in:
  • Phys.Rev.D 85 (2012) 112013
e-Print:
DOI:
Report number:
  • LHCB-PAPER-2011-042,
  • CERN-PH-EP-2012-041
Experiments:
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Abstract: (arXiv)
The ratio of branching fractions of the radiative BB decays B0→K∗0γB^0\to K^{*0}\gamma and Bs0→ϕγB^0_s\to \phi\gamma has been measured using 0.37 0.37\,fb−1^{-1} of pppp collisions at a centre of mass energy of s=7 \sqrt{s}=7\,TeV, collected by the LHCb experiment. The value obtained is \begin{equation} \frac{{\cal B}(B^0\to K^{*0}\gamma)}{{\cal B}(B^0_s\to \phi\gamma)} = 1.12 \pm 0.08^{+0.06}_{-0.04}\phantom{.}^{+0.09}_{-0.08},\nonumber \end{equation} where the first uncertainty is statistical, the second systematic and the third is associated to the ratio of fragmentation fractions fs/fdf_s/f_d. Using the world average for B(B0→K∗0γ)=(4.33±0.15) ×10−5{\cal B}(B^0\to K^{*0}\gamma) = (4.33\pm 0.15)~\times10^{-5}, the branching fraction B(Bs0→ϕγ){\cal B}(B^0_s\to \phi\gamma) is measured to be (3.9±0.5)×10−5(3.9\pm0.5)\times10^{-5}, which is the most precise measurement to date.
Note:
  • 15 pages, 1 figure, 2 tables
  • 13.20.He
  • 13.40.Hq
  • branching ratio: ratio: measured
  • B0: radiative decay
  • B/s0: radiative decay
  • p p: scattering
  • LHC-B
  • B0: branching ratio
  • B/s0: branching ratio
  • experimental results