Spectator scattering at NLO in non-leptonic B decays: Tree amplitudes

Beneke, M and Jäger, S (2006) Spectator scattering at NLO in non-leptonic B decays: Tree amplitudes. Nuclear Physics B, 751 (1-2). pp. 160-185. ISSN 0550-3213

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We compute the I-loop (alpha(2)(s)) correction to hard spectator scattering in non-leptonic B decay tree amplitudes. This forms part of the NNLO contribution to the QCD factorization formula for hadronic B decays, and introduces a new rescattering phase that corrects the leading-order result for direct CP asymmetries. Among the technical issues, we discuss the cancellation of infrared divergences, and the treatment of evanescent four-quark operators. The infrared finiteness of our result establishes factorization of spectator scattering at the I-loop order. Depending on the values of hadronic input parameters, the new I-loop correction may have a significant impact on tree-dominated decays such as B -> pi pi.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Sebastian Jaeger
Date Deposited: 06 Feb 2012 19:43
Last Modified: 23 Apr 2012 14:41
URI: http://sro.sussex.ac.uk/id/eprint/21924
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