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Exclusive chromomagnetism in heavy-to-light FCNCs

Exclusive chromomagnetism in heavy-to-light FCNCs
Exclusive chromomagnetism in heavy-to-light FCNCs
We compute matrix elements of the chromomagnetic operator, often denoted by O 8 , between B/D states and light mesons plus an off-shell photon by employing the method of light-cone sum rules at leading twist-2. These matrix elements are relevant for processes such as B?K ? l + l ? and they can be seen as the analogues of the well-known penguin form factors T 1,2,3 and f T . We find a large CP -even phase for which we give a long-distance interpretation. We compare our results to QCD factorization for which the spectator photon emission is end-point divergent. The analytic structure of the correlation function used in our method admits a complex anomalous threshold on the physical sheet. The meaning and handling within the sum rule approach of the anomalous threshold is discussed.
1550-7998
1-25
Dimou, Maria
c2d7ff92-c1fd-45af-9788-f1ef85d04afe
Lyon, James
d992a478-ac4e-4fe9-b6fd-e707050ad436
Zwicky, Roman
e1972346-331c-45ba-b057-ddb9ce03c3de
Dimou, Maria
c2d7ff92-c1fd-45af-9788-f1ef85d04afe
Lyon, James
d992a478-ac4e-4fe9-b6fd-e707050ad436
Zwicky, Roman
e1972346-331c-45ba-b057-ddb9ce03c3de

Dimou, Maria, Lyon, James and Zwicky, Roman (2013) Exclusive chromomagnetism in heavy-to-light FCNCs. Physical Review D, 87 (7), 1-25. (doi:10.1103/PhysRevD.87.074008).

Record type: Article

Abstract

We compute matrix elements of the chromomagnetic operator, often denoted by O 8 , between B/D states and light mesons plus an off-shell photon by employing the method of light-cone sum rules at leading twist-2. These matrix elements are relevant for processes such as B?K ? l + l ? and they can be seen as the analogues of the well-known penguin form factors T 1,2,3 and f T . We find a large CP -even phase for which we give a long-distance interpretation. We compare our results to QCD factorization for which the spectator photon emission is end-point divergent. The analytic structure of the correlation function used in our method admits a complex anomalous threshold on the physical sheet. The meaning and handling within the sum rule approach of the anomalous threshold is discussed.

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PhysRevD.87.074008 - Version of Record
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Published date: 8 April 2013
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 369409
URI: http://eprints.soton.ac.uk/id/eprint/369409
ISSN: 1550-7998
PURE UUID: 0e1afceb-c687-4a9b-9124-6d5196e25e6d

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Date deposited: 25 Sep 2014 13:32
Last modified: 14 Mar 2024 18:03

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Contributors

Author: Maria Dimou
Author: James Lyon
Author: Roman Zwicky

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