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Penguins with charm and quark–hadron duality

Penguins with charm and quark–hadron duality
Penguins with charm and quark–hadron duality
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.
1434-6044
439-449
Beneke, M.
fdc331cd-2ac7-45b0-b029-b4adb614d332
Buchalla, G.
e272ee94-b3db-41d0-a95d-aa202ed85cd2
Neubert, M.
748c5621-4d14-45bc-b1f2-74bf1b35fcc8
Sachrajda, C.T.
0ed6568b-f52f-4314-8677-4aeeb925d6f7
Beneke, M.
fdc331cd-2ac7-45b0-b029-b4adb614d332
Buchalla, G.
e272ee94-b3db-41d0-a95d-aa202ed85cd2
Neubert, M.
748c5621-4d14-45bc-b1f2-74bf1b35fcc8
Sachrajda, C.T.
0ed6568b-f52f-4314-8677-4aeeb925d6f7

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. (doi:10.1140/epjc/s10052-009-1028-9).

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.

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Published date: 8 April 2009

Identifiers

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

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Date deposited: 26 May 2010 07:59
Last modified: 13 Oct 2017 16:31

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