Khodjamirian, A.; Mannel, Th.; Melić, Blaženka
(2003)
QCD lightcone sum rule estimate of charming penguin contributions in B > pi pi.
Physics Letters B, 572
(34).
pp. 171180.
ISSN 03702693
Abstract
Employing the QCD lightcone sum rule approach we calculate the B > pipi hadronic matrix element of the currentcurrent operator with c quarks in the penguin topology ("charming penguin"). The dominant contribution to the sum rule is due to the cquark loop at short distances and is of O(alpha(S)) with respect to the factorizable B > pipi amplitude. The effects of soft gluons are suppressed at least by O (alpha(S) m(b)(2)). Our result indicates that sizable nonperturbative effects generated by charming penguins at finite mb are absent. The same is valid for the penguin contractions of the currentcurrent operators with light quarks. (C) 2003 Elsevier B.V. All rights reserved.
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