Abstract
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 ∧/mQ to these symmetry relations, showing also how to include hard gluon effects systematically to any order in αs(mQ). The subleading correction to the form factor relation for B→π 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.
Original language | English |
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Pages (from-to) | 8-16 |
Number of pages | 9 |
Journal | Physics Letters B |
Volume | 533 |
Issue number | 1-2 |
DOIs | |
State | Published - 2 May 2002 |