B meson decays

PMC Physics A

Table 13 Measured branching fractions, minimum photon energy, and branching fractions for E_min= 1.6 GeV photon energy for b → s γ .

Experiment	E _min	$ℬ$ (10^-6) at E_min	$ℬ$ _Modif.(10^-6) [217] E_min = 1.6 GeV	$ℬ$ _Modif.(10^-6) [196] E_min = 1.6 GeV
CLEO(Incl.) [260]	2.0	306 ± 41 ± 26	337	323
Belle(Semi-inc) [261]	2.24	336 ± 53 ± 42	496	434
BaBar(Semi-inc) [262]	1.9	$327 \pm 18_{- 40}^{+ 55}$	354	337
BaBar(Incl.) [220]	1.9	367 ± 29 ± 34	397	378
BaBar(recoil) [263]	1.9	366 ± 85 ± 60	396	377
Belle(Incl.) [264]	1.7	331 ± 19 ± 37	337	333
Belle(Incl.) [264]	1.8	324 ± 17 ± 24	339	329
Belle(Incl.) [264]	1.9	312 ± 15 ± 16	338	321
Belle(Incl.) [264]	2.0	294 ± 14 ± 12	334	310
Average	1.6	-	$\begin{matrix} 350 \pm 14_{e x p} \pm 5_{m_{b}} \pm 8_{μ_{π}^{2}} \\ χ^{2} / n d f = 7.3 / 8 \end{matrix}$	$\begin{matrix} 322 \pm 14_{e x p} \pm 3_{m_{b}} \\ χ^{2} / n d f = 8.3 / 8 \end{matrix}$

The third error is the model uncertainty quoted by the experiment. Two world averages are calculated extrapolating all the branching fractions using two different theoretical calculations [196] and [217]. The Belle semi-inclusive measurement sums up 16 modes, BaBar 38 modes. The Belle inclusive analysis calculates the branching fraction for different photon energy cut-offs.