An Estimate of the B ---> K* gamma form factor - INSPIRE

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An Estimate of the B ---> K* gamma form factor

Damir Becirevic
(
- Orsay, LPT
)
,
Vittorio Lubicz
(
- Rome III U. and
- INFN, Rome3
)
,
Federico Mescia
(
- Frascati
)

Nov, 2006

16 pages

Published in:

Nucl.Phys.B 769 (2007) 31-43

e-Print:

hep-ph/0611295 [hep-ph]

DOI:

10.1016/j.nuclphysb.2007.01.032

Report number:

LPT-ORSAY-06-73,
RM3-TH-06-22

View in:

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Abstract:

We present the results of a lattice QCD calculation of the form factor relevant to B-->K*gamma decay. Our final value, T(0) = 0.24 +/- 0.03(+0.04/-0.01), is obtained in the quenched approximation, and by extrapolating T(q2=0:H--> K*)MH^(3/2) from the directly accessed H-heavy mesons to the meson B. We also show that the extrapolation from B-->K*gamma* to B-->K*gamma leads to a result consistent with the one quoted above. On the other hand, our results are not accurate enough to solve the SU(3) flavor breaking effects in the form factor and we quote T(q2=0:B--> K*)/T(q2=0:B-->rho)=1.2(1), as our best estimate.

12.38.Gc
13.25.Jx
13.30.Ce
13.25.Hw
13.75Lb
13.75Lb
B: radiative decay
B: form factor
B: branching ratio
lattice field theory

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Figures(0)

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