NNLO corrections to B --> X_u l nu in the shape-function region
| dc.creator | Asatrian, H. M. | |
| dc.creator | Greub, C. | |
| dc.creator | Pecjak, B. D. | |
| dc.date | 2008-10-06 | |
| dc.date.accessioned | 2026-07-07T12:27:02Z | |
| dc.date.available | 2026-07-07T12:27:02Z | |
| dc.description | 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. | |
| dc.description | 17 pages, 1 figure | |
| dc.identifier | https://arxiv.org/abs/0810.0987 | |
| dc.identifier | http://arxiv.org/abs/0810.0987 | |
| dc.identifier | Phys.Rev.D78:114028,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.78.114028 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/215072 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | NNLO corrections to B --> X_u l nu in the shape-function region | |
| dc.type | text |