Pion structure function at small x from DIS data
arXiv:1205.0067 · doi:10.1103/PhysRevD.85.114025
Abstract
Production of leading neutrons in DIS is usually considered as a tool to measure the pion structure function at small x accessible at HERA. The main obstacle is the lack of reliable evaluations of the absorption corrections, which significantly suppress the cross section. We performed a parameter free calculation within the dipole approach and found the absorption corrections to be nearly as strong, as for neutron production in pp collisions. We also included the significant contribution of the iso-vector Reggeons with natural (ρ, a_2) and unnatural (a_1, ρ-π cut) parity with parameters constrained by phenomenology. With a certain modeling for the pion-to-proton ratio of the structure functions we reached good agreement with data from the ZEUS and H1 experiments, successfully reproducing the observed dependence on the fractional neutron momentum z, the photon virtuality Q^2, and the transverse momentum transfer q_T.
17 pages, 12 figures
References in corpus (9)
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- Azimuthal anisotropy of direct photons
- Leading neutron spectra
- Azimuthal Asymmetry of pions in pp and pA collisions
- Evidences for two scales in hadrons
- Damping of forward neutrons in pp collisions
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- Breakdown of PCAC in diffractive neutrino interactions
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- Complementarity of experimental and lattice QCD data on pion parton distributions
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- Diffractive gauge bosons production beyond QCD factorisation
- Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries
- Gluon saturation and Feynman scaling in leading neutron production
- Exclusive processes with a leading neutron in collisions
- Pion-pion cross section from proton-proton collisions at the LHC
- QCD analysis of forward neutron production in DIS
- Diffractive Bremsstrahlung in Hadronic Collisions
- Leading neutron production at the EIC and LHeC: estimating the impact of the absorptive corrections
- Investigating saturation effects and the virtual pion in leading neutron events at HERA with the dipole model
- Exclusive vector meson production with leading neutrons in a saturation model for the dipole amplitude in mixed space
- Flavor symmetry breaking in the sea
- Geometric scaling in leading neutron events at HERA
- Gluon saturation: survival probability for leading neutrons in DIS
- Leading Neutrons From Polarized Proton-Nucleus Collisions
- Dipole-pion cross section in the saturation regime