On the photon energy moments and their `bias' corrections in B -> X_s+γ
| dc.creator | Benson, D. | |
| dc.creator | Bigi, I. I. | |
| dc.creator | Uraltsev, N. | |
| dc.date | 2004-10-05 | |
| dc.date | 2004-12-24 | |
| dc.date.accessioned | 2026-07-07T10:29:16Z | |
| dc.date.available | 2026-07-07T10:29:16Z | |
| dc.description | Photon energy moments in B -> X_s+γand the impact of experimental cuts are analyzed, including the biases exponential in the effective hardness missed in the conventional OPE. We incorporate the perturbative corrections fully implementing the Wilsonian momentum separation ab initio. This renders perturbative effects numerically suppressed while leaving heavy quark parameters and the corresponding light-cone distribution function well defined and preserving their physical properties. The moments of the distribution function are given by the heavy quark expectation values of which many have been extracted from the B -> X_c lνdecays. The quantitative estimates for the biases in the heavy quark parameters determined from the photon moments show they cannot be neglected for E_cut \gsim 1.85GeV, and grow out of theory control for E_cut above 2.1GeV. Implications for the moments in the B -> X_c lνdecays at high cuts are briefly addressed. | |
| dc.description | 28 pages, LaTeX, five figures. Extended version submitted to NPB after the Belle Workshop; accepted for publication. The critical discussion of the `multiscale' approach of Refs.[14] is extended in Sects. 2.1 and 6. Some technicalities of the calculations are explained in more detail in Appendix 1 and a number of references added. The effect of the higher-order corrections is illustrated (Fig.5) | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0410080 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0410080 | |
| dc.identifier | Nucl.Phys.B710:371-401,2005 | |
| dc.identifier | doi:10.1016/j.nuclphysb.2004.12.035 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177744 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | On the photon energy moments and their `bias' corrections in B -> X_s+γ | |
| dc.type | text |