Fermionic NNLL corrections to b -> s γ
| dc.creator | Bieri, Kay | |
| dc.creator | Greub, Christoph | |
| dc.creator | Steinhauser, Matthias | |
| dc.date | 2003-02-07 | |
| dc.date | 2003-06-04 | |
| dc.date.accessioned | 2026-07-07T11:09:19Z | |
| dc.date.available | 2026-07-07T11:09:19Z | |
| dc.description | In this paper we take the first step towards a complete next-to-next-to-leading logarithmic (NNLL) calculation of the inclusive decay rate for $B \to X_sγ$. We consider the virtual corrections of order $\alphas^2 n_f$ to the matrix elements of the operators ${O}_1$, ${O}_2$ and ${O}_8$ and evaluate the real and virtual contributions to ${O}_7$. These corrections are expected to be numerically important. We observe a strong cancelation between the contributions from the current-current operators and $O_7$ and obtain, after applying naive non-abelianization, a reduction of the branching ratio of 3.9% (for $μ=3.0$ GeV) and an increase of 3.4% (for $μ=9.6$ GeV). | |
| dc.description | 38 pages, result extended to allow for an explicit photon energy cut-off, appendix and references added, final result and conlclusions unchanged | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0302051 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0302051 | |
| dc.identifier | Phys.Rev.D67:114019,2003 | |
| dc.identifier | doi:10.1103/PhysRevD.67.114019 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/190426 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Fermionic NNLL corrections to b -> s γ | |
| dc.type | text |