engleski

Soft gluon contributions to the B --> K eta' amplitude in a low energy bosonization model

Intriguing B --> K eta' decays provide a unique opportunity to study a joining of two-gluon configurations arising from the penguin b --> sG and b --> sGG transitions, with those inherent to the eta' particle. We employ the heavy-light chiral quark model as a calculational tool accounting for the nonperturbative soft gluon contributions to the amplitude. Such a novel contribution, accounting for ~ 10 % of the measured amplitude, is in favour of a significant singlet penguin contribution to the B --> K eta' amplitude.

B mesons; Rare decays; Heavy quarks; Chiral Lagrangians

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