Naslov
Charming penguis in B -> pi pi from QCD light-cone sum rules

Autori
Khodjamrian, A. ; Mannel, Th. ; Melić, Blaženka

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Electronic Proceedings of the Second Workshop on the CKM Unitarity Triangle : eConf C0304052:WG409, 2003 / - , 2003

Skup
Workshop on the CKM Unitarity Triangle (2 ; 2003)

Mjesto i datum
Durham, Ujedinjeno Kraljevstvo, 05.04.2003. - 09.04.2003

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
b decays; penguin operators; sum rules

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

POVEZANOST RADA