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Titolo:
B -> pi pi decay in QCD
Autore:
Khodjamirian, A;
Indirizzi:
CERN, Div Theory, CH-1211 Geneva 23, Switzerland CERN Geneva Switzerland23 N, Div Theory, CH-1211 Geneva 23, Switzerland Univ Lund, Dept Theoret Phys, S-22362 Lund, Sweden Univ Lund Lund SwedenS-22362 d, Dept Theoret Phys, S-22362 Lund, Sweden
Titolo Testata:
NUCLEAR PHYSICS B
fascicolo: 1-3, volume: 605, anno: 2001,
pagine: 558 - 578
SICI:
0550-3213(20010702)605:1-3<558:B-PPDI>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
WEAK NONLEPTONIC DECAYS; HEAVY MESON DECAYS; SUM-RULES; QUANTUM CHROMODYNAMICS; EXCLUSIVE PROCESSES; WAVE-FUNCTIONS; FORM-FACTORS; EVOLUTION-EQUATIONS; LEADING LOGARITHMS; RESONANCE PHYSICS;
Keywords:
B-meson decays; quantum chromodynamics; sum rules;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Khodjamirian, A CERN, Div Theory, CH-1211 Geneva 23, Switzerland CERN Geneva Switzerland 23 H-1211 Geneva 23, Switzerland
Citazione:
A. Khodjamirian, "B -> pi pi decay in QCD", NUCL PHYS B, 605(1-3), 2001, pp. 558-578

Abstract

A new method is suggested to calculate the B --> pi pi hadronic matrix elements from QCD light-cone Sum rules. To leading order in alpha (s) and 1/m(b), the sum rule reproduces a factorizable matrix element. in accordance with the prediction of the QCD factorization approach. Whereas the QCD factorization can only take into account the nonfactorizable corrections induced by hard-gluon exchanges, the method suggested here also allows a systematicinclusion of soft-gluon effects. In this paper, I concentrate on the latter aspect and present a calculation of the nonfactorizable soft-gluon exchange contributions to B --> pi pi. The result, including twist 3 and 4 terms,is suppressed by one power of 1/m(b) with respect to the factorizable amplitude. Despite its numerical smallness, the soft effect is at the same level as the O(alpha (s)) correction to the QCD factorization formula for B -->pi pi. The method suggested here can be applied to matrix elements of different topologies and operators and to various other B-decay channels. I also comment on the earlier applications of QCD sum rules to nonleptonic decays of heavy mesons. (C) 2001 Published by Elsevier Science B.V.

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Documento generato il 03/04/20 alle ore 14:21:02