Towards $B \to V γ$ Decays at NNLO in SCET
| dc.creator | Ali, Ahmed | |
| dc.creator | Pecjak, Ben D. | |
| dc.creator | Greub, Christoph | |
| dc.date | 2007-09-27 | |
| dc.date | 2008-04-17 | |
| dc.date.accessioned | 2026-07-07T11:37:34Z | |
| dc.date.available | 2026-07-07T11:37:34Z | |
| dc.description | We compute NNLO (${\cal O}(α_s^2)$) corrections to the hard-scattering kernels entering the QCD factorization formula for $B\to Vγ$ decays, where $V$ is a light vector meson. We give complete NNLO results for the dipole operators $Q_7$ and $Q_8$, and partial results for $Q_1$ valid in the large-$β_0$ limit and neglecting the NNLO correction from hard spectator scattering. Large perturbative logarithms in the hard-scattering kernels are identified and resummed using soft-collinear effective theory. We use our results to estimate the branching fractions for $B\to K^*γ$ and $B_s\to ϕγ$ decays at NNLO and compare them with the current experimental data. | |
| dc.description | 33 pages, 2 figures; text modified in sections 3 and 4, added 3 equations [(23),(40),(46)] and corrected Eq. (39); added 4 references; title slightly modified; to appear in the European Physical Journal C | |
| dc.identifier | https://arxiv.org/abs/0709.4422 | |
| dc.identifier | http://arxiv.org/abs/0709.4422 | |
| dc.identifier | Eur.Phys.J.C55:577-595,2008 | |
| dc.identifier | doi:10.1140/epjc/s10052-008-0623-5 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/199248 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Towards $B \to V γ$ Decays at NNLO in SCET | |
| dc.type | text |