2018/08/31 by J. O. Gonzalez-Hernandez, T. C. Rogers, N. Sato +1
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1103/physrevd.98.114005
published as Phys. Rev. D 98, 114005 (2018) · 11 pages, 7 figures. arXiv admin note: text overlap with arXiv:hep-ph/0411212 by other authors, version to appear in PRD
arxiv created 2018/12/12 · arxiv updated 2018/12/19
We survey the current phenomenological status of semi-inclusive deep inelastic scattering at moderate hard scales and in the limit of very large transverse momentum. As the transverse momentum becomes comparable to or larger than the overall hard scale, the differential cross sections should be calculable with fixed order pQCD methods, while small transverse momentum (TMD factorization) approximations should eventually break down. We find large disagreement between HERMES and COMPASS data and fixed order calculations done with modern parton densities, even in regions of kinematics where such calculations should be expected to be very accurate. Possible interpretations are suggested.