Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-18
Nucl.Phys.B704:56-74,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
30 pages, 4 figures, typos in formulae (80), (82), (83) corrected, numerical results unaffected
Scientific paper
10.1016/j.nuclphysb.2004.10.024
The direct CP asymmetry in the untagged inclusive channel B -> X_(s+d) gamma provides a strict test of the standard model. It has been shown beyond the partonic level that this asymmetry is negligibly small thanks to U-spin relations and to the unitarity of the CKM matrix. In the present paper we investigate this relation beyond the SM; in particular, we analyse to which extent deviations from this prediction are possible in supersymmetric scenarios. We analyse the minimal flavour violation scenario, including tan(beta) enhanced terms and using the complete two-loop renormalization group running. Our analysis fully takes into account also the EDM constraints on the supersymmetric phases. We investigate possible correlations between the tagged and the untagged CP asymmetries and the indirect sensitivity of the latter to the B -> X_d gamma CP asymmetry. Furthermore, we derive general model-independent formulae for the branching ratios and CP asymmetries for the inclusive B -> X_d gamma and B -> X_s gamma modes, and update the corresponding SM predictions.
Hurth Tobias
Lunghi Enrico
Porod Werner
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