Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

Accardi, A.; Hobbs, T. J.; Jing, X.; Nadolsky, P. M.

doi:10.1140/epjc/s10052-021-09318-y

Title: Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

Journal Article · 11 July 2021 · European Physical Journal. C, Particles and Fields

DOI: https://doi.org/10.1140/epjc/s10052-021-09318-y · OSTI ID:1807638

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Abstract Experimental measurements in deep-inelastic scattering and lepton-pair production on deuterium targets play an important role in the flavor separation of u and d (anti)quarks in global QCD analyses of the parton distribution functions (PDFs) of the nucleon. We investigate the impact of theoretical corrections accounting for the light-nuclear structure of the deuteron upon the fitted u , d -quark, gluon, and other PDFs in the CJ15 and CT18 families of next-to-leading order CTEQ global analyses. The investigation is done using the $$$$L_2$$$$ $L_{2}$ sensitivity statistical method, which provides a common metric to quantify the strength of experimental constraints on various PDFs and ratios of PDFs in the two distinct fitting frameworks. Using the $$$$L_2$$$$ $L_{2}$ sensitivity and other approaches, we examine the compatibility of deuteron data sets with other fitted experiments under varied implementations of the deuteron corrections. We find that freely-fitted deuteron corrections modify the PDF uncertainty at large momentum fractions and will be relevant for future PDFs affecting electroweak precision measurements.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: U.S. Department of Energy; USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-07CH11359; AC05-06OR23177; SC0008791; SC0010129

OSTI ID:: 1807638

Report Number(s):: DOE/OR/23177-5136; FERMILAB-PUB--21-576-SCD; JLAB-THY--21-3313; SMU-HEP--20-08; SMU-HEP-20-08; arXiv:2102.01107; 603; PII: 9318

Journal Information:: European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 7 Vol. 81; ISSN 1434-6044

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Germany

Language:: English

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Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs Bailey, S.; Cridge, T.; Harland-Lang, L. A. The European Physical Journal C, Vol. 81, Issue 4 https://doi.org/10.1140/epjc/s10052-021-09057-0	journal	April 2021
Measurement of $F_2^{c\bar{c}}$ and $F_2^{b\bar{b}}$ at high Q 2 using the H1 vertex detector at HERA Collaboration, H1 The European Physical Journal C, Vol. 40, Issue 3, p. 349-359 https://doi.org/10.1140/epjc/s2005-02154-8	journal	April 2005
The challenge of the EMC effect: Existing data and future directions Malace, Simona; Gaskell, David; Higinbotham, Douglas W. International Journal of Modern Physics E, Vol. 23, Issue 08 https://doi.org/10.1142/S0218301314300136	journal	August 2014
Parton Distributions in Nucleons and Nuclei Ethier, Jacob J.; Nocera, Emanuele R. Annual Review of Nuclear and Particle Science, Vol. 70, Issue 1 https://doi.org/10.1146/annurev-nucl-011720-042725	journal	October 2020
PDFs from protons to nuclei Accardi, Alberto Proceedings of XXIII International Workshop on Deep-Inelastic Scattering — PoS(DIS2015) https://doi.org/10.22323/1.247.0001	conference	January 2016
High-Luminosity Large Hadron Collider (HL-LHC) Apollinari, G.; Béjar Alonso, I.; Brüning, O. CERN Yellow Reports https://doi.org/10.23731/CYRM-2017-004	report	January 2017

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