QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi

Khodjamirian, A.; Mannel, Th.; Melić, Blaženka (2003) QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi. Physics Letters B, 572 (3-4). pp. 171-180. ISSN 0370-2693

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Abstract

Employing the QCD light-cone sum rule approach we calculate the B --> pipi hadronic matrix element of the current-current operator with c quarks in the penguin topology ("charming penguin"). The dominant contribution to the sum rule is due to the c-quark 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 current-current operators with light quarks. (C) 2003 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	exclusive decays; factorization; quark
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Theoretical Physics Division
Projects:	Project title Project leader Project code Project type Temeljne interakcije u fizici elementarnih čestica i kozmologiji Branko Guberina 0098002 MZOS
Depositing User:	Blaženka Melić
Date Deposited:	29 May 2013 12:38
URI:	http://fulir.irb.hr/id/eprint/546
DOI:	10.1016/j.physletb.2003.08.021

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