no way to compare when less than two revisions
Differences
This shows you the differences between two versions of the page.
— | preprints:2002:ttp02-16 [2016/03/17 11:03] (current) – created - external edit 127.0.0.1 | ||
---|---|---|---|
Line 1: | Line 1: | ||
+ | ====== TTP02-16 Gluonic Penguins in $B\to \pi\pi$ from QCD Light-Cone Sum Rules ====== | ||
+ | |||
+ | |||
+ | < | ||
+ | of the chromomagnetic dipole operator $O_{8g}$ | ||
+ | | ||
+ | | ||
+ | | ||
+ | to the $O(\alpha_s)$ part induced by hard gluon exchanges, | ||
+ | a contribution due to soft gluons. We find that in the | ||
+ | limit $m_b\to \infty$ the soft-gluon contribution | ||
+ | is suppressed as a second power of $1/m_b$ with respect | ||
+ | to the leading-order factorizable $B\to \pi\pi$ amplitude, | ||
+ | | ||
+ | | ||
+ | and hard effects of the gluonic penguin in $B\to \pi\pi$ | ||
+ | are of the same order. Our result indicates that soft | ||
+ | | ||
+ | of nonfactorizable effects in charmless $B$ decays. | ||
+ | On the phenomenological side we predict that the | ||
+ | | ||
+ | is very small, but is noticeable for $\bar{B}^0_d\to \pi^0\pi^0$. | ||
+ | </ | ||
+ | |**Alexander Khodjamirian, | ||
+ | |** Phys.Rev. | ||
+ | | {{preprints: | ||
+ | | | |