Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-10-06
Phys.Rev.D78:114028,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 1 figure
Scientific paper
10.1103/PhysRevD.78.114028
The inclusive decay B --> X_u l nu is of much interest because of its potential to constrain the CKM element |V_ub|. Experimental cuts required to suppress charm background restrict measurements of this decay to the shape-function region, where the hadronic final state carries a large energy but only a moderate invariant mass. In this kinematic region, the differential decay distributions satisfy a factorization formula of the form $H \cdot J \otimes S$, where S is the non-perturbative shape function, and the object $H \cdot J$ is a perturbatively calculable hard-scattering kernel. In this paper we present the calculation of the hard function H at next-to-next-to-leading order (NNLO) in perturbation theory. Combined with the known NNLO result for the jet function J, this completes the perturbative part of the NNLO calculation for this process.
Asatrian H. M.
Greub Christoph
Pecjak Ben D.
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