2011/12/31 by Wei Wang · 1 citation
Physics and Astronomy · #Baryon #Effective field theory #Factorization #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/j.physletb.2012.01.036
published as Physics Letters B 708 (2012) 119--126 · 18 pages, 2 figures, references and more discussions added; journal version
openalex publication_date 2012/01/16 · arxiv created 2012/02/08 · arxiv updated 2015/06/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In the framework of the soft-collinear effective theory, we demonstrate that the leading-power heavy-to-light baryonic form factors at large recoil obey the heavy quark and large energy symmetries. Symmetry breaking effects are suppressed by Λ/mb or Λ/E, where Λ is the hadronic scale, mb is the b quark mass and E∼mb is the energy of light baryon in the final state. At leading order, the leading power baryonic form factor ξΛ,p(E), in which two hard-collinear gluons are exchanged in the baryon constituents, can factorize into the soft and collinear matrix elements convoluted with a hard-kernel of order αs2. Including the energy release dependence, we derive the scaling law ξΛ,p(E)∼Λ2/E2. We also find that this form factor ξΛ(E) is numerically smaller than the form factor governed by soft processes, although the latter is formally power-suppressed.