Charming penguins in B -> pi pi from QCD light-cone sum rules (CROSBI ID 690361)
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Podaci o odgovornosti
Melić, Blaženka
engleski
Charming penguins in B -> pi pi from QCD light-cone sum rules
We use QCD light-cone sum rules to examine the B -> pi pi hadronic matrix element of the current-current operator with c quarks in the penguin topology (``charming penguin'') as a potential source of the substantial O(1/m_b) effects. Our results indicate that charming penguins do not generate sizable nonperturbative effects at finite m_b. The same is valid for the penguin contractions of the current- current operators with light quarks. The dominant penguin topology effects are predicted to be O(\alpha_s). Still, the nonperturbative effects at finite m_b can accumulate to a visible effect that is illustrated by calculating the CP-asymmetry in the B^0_d -> pi^+ pi^- decay.
B decays, nonleptonic charmless decays, nonfactorizable contributions
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Podaci o prilogu
2003.
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Podaci o matičnoj publikaciji
Podaci o skupu
Second Workshop on the CKM Unitarity Triangle
pozvano predavanje
05.04.2003-09.04.2003
Durham, Ujedinjeno Kraljevstvo