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

Abstract

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. Here, 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.

Authors:
 [1];  [2];  [3];  [4]
  1. Old Dominion Univ., Norfolk, VA (United States); Univ. di Torino, Torino (Italy); INFN-Sezione Torino, Torino (Italy)
  2. Old Dominion Univ., Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Old Dominion Univ., Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Zhejiang Univ., Hangzhou (China)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1485197
Alternate Identifier(s):
OSTI ID: 1485271
Report Number(s):
JLAB-THY-18-2782; DOE/OR/23177-4509; arXiv:1808.04396
Journal ID: ISSN 2470-0010; PRVDAQ
Grant/Contract Number:  
SC0018106; AC05-06OR23177; FG-04ER41309; FG02-97ER41028; 11135006; 11275168; 11422544; 11375151; 11535002; 2017QNA3007
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Gonzalez-Hernandez, J. O., Rogers, Ted C., Sato, Nobuo, and Wang, B. Challenges with large transverse momentum in semi-inclusive deeply inelastic scattering. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.114005.
Gonzalez-Hernandez, J. O., Rogers, Ted C., Sato, Nobuo, & Wang, B. Challenges with large transverse momentum in semi-inclusive deeply inelastic scattering. United States. doi:10.1103/PhysRevD.98.114005.
Gonzalez-Hernandez, J. O., Rogers, Ted C., Sato, Nobuo, and Wang, B. Mon . "Challenges with large transverse momentum in semi-inclusive deeply inelastic scattering". United States. doi:10.1103/PhysRevD.98.114005.
@article{osti_1485197,
title = {Challenges with large transverse momentum in semi-inclusive deeply inelastic scattering},
author = {Gonzalez-Hernandez, J. O. and Rogers, Ted C. and Sato, Nobuo and Wang, B.},
abstractNote = {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. Here, 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.},
doi = {10.1103/PhysRevD.98.114005},
journal = {Physical Review D},
number = 11,
volume = 98,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.98.114005

Citation Metrics:
Cited by: 5 works
Citation information provided by
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Figures / Tables:

FIG. 1 FIG. 1: Momentum labeling in amplitudes for 2 → N partonic scattering kinematics. The dashed lines represent partons of unspecified type and flavor. The dot on the end of k1 is to indicate this is the parent parton of the detected hadron. The other momenta are integrated in SIDIS. Allmore » final state lines are meant to represent energetic but mutually highly noncollinear massless partons. If two lines become nearly collinear, it should be understood that they merge into a single line. If a line becomes soft, it is simply to be removed. In both cases, 2 → N kinematics reduce to 2 → N − 1 kinematics. (a) is a general 2 → N amplitude. For perturbatively large PHT, N ≥ 1, and the lowest order contribution is O(αs), corresponding to the 2 → 2 kinematics in (b). We will consider in addition the 2 → 3 kinematics in (c), which appear at O(α$2\atop{s}$).« less

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