Implications of the first observation of B→ K 1 γ
Abstract
Implications of the recent new measurements of
B→
K
1
γ
by Belle are examined. It is shown that the new branching ratio $\calB(B\to K_1(1270)\gamma)$ requires very large form factor compared to the theoretically predicted one. This is an opposite case to
B→
K
∗
γ
where theory expected larger branching ratio. Possible origins of the discrepancy are discussed.