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Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays

Abstract:
We evaluate the complete four-loop anomalous dimension matrix that is necessary for determining the effective flavour-changing neutral current couplings qbar-q'-gamma and qbar-q'-g at the next-to-next-to-leading order in QCD. The resulting O(alpha_s^2(mu_b)) correction to the B -> X_s gamma branching ratio amounts to around -2.9% for mu_b = 5 GeV, and -4.4% for mu_b = 2.5 GeV

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Theoretical Physics
Role:
Author
Journal:
JHEP
Volume:
0703
Issue:
03
Pages:
008
Publication date:
2006-12-27
DOI:
EISSN:
1029-8479
Source identifiers:
177515
Keywords:
Pubs id:
pubs:177515
UUID:
uuid:64099944-1c6c-4c63-ba03-54aa8f9f2d3e
Local pid:
pubs:177515
Deposit date:
2012-12-19

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