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# Penguins with charm and quark–hadron duality

Beneke, M., Buchalla, G., Neubert, M. and Sachrajda, C.T. (2009) Penguins with charm and quark–hadron duality. The European Physical Journal C, 61 (3), 439-449.

Record type: Article

## Abstract

The integrated branching fraction of the process B?X s l + l ? is dominated by resonance background from narrow charmonium states, such as B?X s ??X s l + l ?, which exceeds the non-resonant charm-loop contribution by two orders of magnitude. The origin of this fact is discussed in view of the general expectation of quark–hadron duality.

The situation in B?X s l + l ? is contrasted with charm-penguin amplitudes in two-body hadronic B decays of the type B?? ?, for which it is demonstrated that resonance effects and the potentially non-perturbative $c\bar{c}$ threshold region do not invalidate the standard picture of QCD factorization. This holds irrespective of whether the charm quark is treated as a light or a heavy quark.

Published date: 8 April 2009

## Identifiers

Local EPrints ID: 143303
URI: http://eprints.soton.ac.uk/id/eprint/143303
ISSN: 1434-6044
PURE UUID: bfeb9752-5e53-41c9-b02c-0ce086f88b79

## Catalogue record

Date deposited: 26 May 2010 07:59

## Contributors

Author: M. Beneke
Author: G. Buchalla
Author: M. Neubert
Author: C.T. Sachrajda