A Lattice study of the exclusive B ---> K* gamma decay amplitude, using the Clover action at Beta = 6.0

Abada, A.; Boucaud, Ph; Cabibbo, N; Crisafulli, M; Leroy, J.P; Lubicz, V; Martinelli, G; Rapuano, F; Serone, M; Stella, N

doi:10.1016/0370-2693(95)01236-2

A Lattice study of the exclusive B ---> K* gamma decay amplitude, using the Clover action at Beta = 6.0

APE

Collaboration

•

A. Abada
(
- Orsay, LPT
)

Mar, 1995

16 pages

Published in:

Phys.Lett.B 365 (1996) 275-284

e-Print:

hep-lat/9503020 [hep-lat]

DOI:

10.1016/0370-2693(95)01236-2

Report number:

CERN-TH-95-59,
CERN-TH-95-059,
ROME-1056-1994,
LPTHE-ORSAY-94-88,
SHEP-95-11

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Abstract: (DESY)

We present the results of a numerical calculation of the

B\rightarrow K~* \gamma

form factors. The results have been obtained by studying the relevant correlation functions at

\beta=6.0

, on an

18~3 \times 64

lattice, using the

{\rm O(a)}

-improved fermion action, in the quenched approximation. From the study of the matrix element

\langle K~*\vert \bar s \sigma_{\mu\nu} b \vert B\rangle

we have obtained the form factor

T_1(0)

which controls the exclusive decay rate. The results are compared with the recent results from CLEO. We also discuss the compatibility between the scaling laws predicted by the Heavy Quark Effective Theory (HQET) and pole dominance, by studying the mass- and

q~2

-dependence of the form factors. From our analysis, it appears that the form factors follow a mass behaviour compatible with the predictions of the HQET and that the

q~2

-dependence of

T_2

is weaker than would be predicted by pole dominance.

Note:

17 pages, LaTeX + epsf.sty. Uuencoded, compressed, tar archive including the text and one postscript figure. Report-no: CERN-TH/95-59, ROME prep. 94/1056, LPTHE Orsay-94/88, SHEP prep 95/11

lattice field theory
gauge field theory: SU(3)
B: radiative decay
radiative decay: B
B: branching ratio
K*(892)
form factor: decay
decay: form factor
amplitude analysis: decay
decay: amplitude analysis

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Figures(0)

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