2012

Exclusive Chromomagnetism in heavy-to-light FCNCs

Dimou, Maria, Lyon, James, Zwicky, Roman

Understand

We compute matrix elements of the chromomagnetic operator, often denoted by $ {\cal O}_8$, between $B/D$-states and light mesons plus an off-shell photon by employing the method of light-cone sum rules (LCSR) at leading twist-2.

These matrix elements are relevant for processes such as $B \to K^* l^+l^-$ and they can be seen as the analogues of the well-known penguin form factors $T_{1,2,3}$ and $f_T$.
We find a large CP-even phase for which we give a long-distance (LD) interpretation.
We compare our results to QCD factorisation for which the spectator photon emission is end-point divergent.

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