2004/10/31 by D. Benson, I. I. Bigi, Nikolai Uraltsev +1 · 1 citation
Physics and Astronomy · #Energy (signal processing) #High-Energy Particle Collisions Research #Optics #Particle physics theoretical and experimental studies #Photon #Photon energy #Physics #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #hep-ph
paper · pdf · doi:10.1016/j.nuclphysb.2004.12.035
published as Nucl.Phys.B710:371-401,2005 · 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)
arxiv created 2004/12/24 · openalex publication_date 2005/01/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Photon energy moments in B -> Xs+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 -> Xc lνdecays. The quantitative estimates for the biases in the heavy quark parameters determined from the photon moments show they cannot be neglected for Ecut \gsim 1.85GeV, and grow out of theory control for Ecut above 2.1GeV. Implications for the moments in the B -> Xc lνdecays at high cuts are briefly addressed.