Challenges with large transverse momentum in semi-inclusive deeply inelastic scattering

We survey the current phenomenological status of semi-inclusive deeply 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 ca...

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Bibliographic Details
Published in:Physical review. D 2018-12, Vol.98 (11), p.1, Article 114005
Main Authors: Gonzalez-Hernandez, J. O., Rogers, T. C., Sato, N., Wang, B.
Format: Article
Language:English
Subjects:
Approximation
Inelastic scattering
Kinematics
Mathematical analysis
NUCLEAR PHYSICS AND RADIATION PHYSICS
particle production
perturbation theory
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
quantum chromodynamics
strong interaction
Transverse momentum
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Summary:We survey the current phenomenological status of semi-inclusive deeply 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 perturbative QCD (pQCD) methods, while small transverse momentum (transverse-momentum-dependent 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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.98.114005