Pregled bibliografske jedinice broj: 1060687
Estimate of charming penguins in B -> pi pi
Estimate of charming penguins in B -> pi pi // Europhysics Conference on High Energy Physics (EPS-HEP 2003)
Aachen, Njemačka, 2003. (pozvano predavanje, podatak o recenziji nije dostupan, pp prezentacija, znanstveni)
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Naslov
Estimate of charming penguins in B -> pi pi
Autori
Melić, Blaženka
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, pp prezentacija, znanstveni
Skup
Europhysics Conference on High Energy Physics (EPS-HEP 2003)
Mjesto i datum
Aachen, Njemačka, 17.07.2003. - 23.07.2003
Vrsta sudjelovanja
Pozvano predavanje
Vrsta recenzije
Podatak o recenziji nije dostupan
Ključne riječi
B decays, nonleptonic charmless decays, nonfactorizable contributions
Sažetak
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.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
