Measurement of the ratio of branching fractions $BR(B_0 \to K^{\star 0} \gamma)/BR(B_{s0} \to \phi \gamma)$ and the direct CP asymmetry in $B_0 \to K^{\star 0} \gamma$ - INSPIRE

DataBETA

Measurement of the ratio of branching fractions $BR(B_0 \to K^{\star 0} \gamma)/BR(B_{s0} \to \phi \gamma)$ and the direct CP asymmetry in $B_0 \to K^{\star 0} \gamma$

LHCb

Collaboration

Sep, 2012

21 pages

Published in:

Nucl.Phys.B 867 (2013) 1-18

Published: Feb 1, 2013

e-Print:

1209.0313 [hep-ex]

DOI:

10.1016/j.nuclphysb.2012.09.013

PDG:

\mathit A_{CP}({{\mathit B}^{0}}

\rightarrow

{{\mathit K}^{*}{(892)}^{0}}{{\mathit \gamma}}

Report number:

LHCB-PAPER-2012-019,
CERN-PH-EP-2012-247

Experiments:

CERN-LHC-LHCb

View in:

reference search113 citations

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Abstract: (Elsevier)

The ratio of branching fractions of the radiative B decays B0→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 is B(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 fs/fd . 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 B0→K⁎0γ decays has also been measured with the same data and found to be ACP(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.

branching ratio: ratio: measured
asymmetry: CP: measured
B0: radiative decay
p p: scattering
B/s0: radiative decay
experimental results
fragmentation
LHC-B
B/s0: branching ratio: measured
CERN LHC Coll

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