Journal
PHYSICS LETTERS B
Volume 533, Issue 1-2, Pages 8-16Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(02)01601-5
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In the heavy quark limit, the form factors for semileptonic and rare radiative B decays into light mesons are related by heavy quark spin symmetry. Here we compute the leading corrections of order Lambda/m(Q) to these symmetry relations, showing also how to include hard gluon effects systematically to any order in alpha(s)(m(Q)). The subleading correction to the form factor relation for B --> pi can be computed exactly in the soft pion limit. For decays into vector mesons, the matrix elements of two local dimension-4 operators are needed, one of which vanishes in the constituent quark model. A few applications are briefly discussed. (C) 2002 Elsevier Science B.V All rights reserved.
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