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Measurement of the ratio of branching fractions B ( B 0 → K ⁎ 0 γ ) / B ( B s 0 → ϕ γ ) and the direct CP asymmetry in B 0 → K ⁎ 0 γ
Name
1-s2.0-S055032131200524X-main.pdf
Description
Published version
Size
528.31 KB
Format
Adobe PDF
Checksum (MD5)
3fe8aed560a0dfb567d90a4eedc3e25e
Date Issued
2013
Journal
Nuclear Physics B
Publisher
Elsevier BV
Version
Final published version
Abstract
The ratio of branching fractions of the radiative B decays B 0→K *0γ and Bs0→φγ has been measured using an integrated luminosity of 1.0 fb -1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s=7 TeV. The value obtained isB(B0→K*0γ)B(Bs0→φγ)=1.23±0.06 (stat.)±0.04 (syst.)±0.10(fs/fd), where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions f s/f d. Using the world average value for B(B0→K*0γ), the branching fraction B(Bs0→φγ) is measured to be (3.5±0.4)×10 -5.The direct CP asymmetry in B 0→K *0γ decays has also been measured with the same data and found to beACP(B0→K*0γ)=(0.8±1.7 (stat.)±0.9 (syst.))%.Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations. © 2012 CERN.
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DOI of Published Version
10.1016/j.nuclphysb.2012.09.013
