2004/05/28 by Roberto Sghedoni, Sghedoni, Roberto
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0405291
Ph.D. Thesis, 141pp
arxiv created 2004/05/28 · openalex publication_date 2004/05/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We derive the strange quark transverse momentum distribution for the % b→ sγ decay. A resummed formula is presented showing the singularity structure in the impact parameter b. We observe the appearance of a new next-to-leading soft singularity. The first term of the coefficient function is calculated to complete the evaluation of the distribution with next-to-leading accuracy and the constant term. The connection with the shape function for the mass spectrum is briefly discussed. The extension of the shape function interpretation to the transverse momentum distribution seems not to be longer possible. The complete perturbative O(α) transverse momentum distribution formula for the b → s γ process is given. The coefficient function, the double and single logarithmic terms together with the remainder function are explicitely evaluated and presented in analytic form. A resummed expression is also shown.