Unveiling the proton spin decomposition at a future electron-ion collider

Aschenauer, Elke C.; Sassot, Rodolfo; Stratmann, Marco

doi:10.1103/PhysRevD.92.094030

Title: Unveiling the proton spin decomposition at a future electron-ion collider

Journal Article · Tue Nov 24 00:00:00 EST 2015 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.92.094030· OSTI ID:1235888

Aschenauer, Elke C. ^[1]; Sassot, Rodolfo ^[2]; Stratmann, Marco ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. de Buenos Aires, Ciudad Univ., Buenos Aires (Argentina)
Univ. of Tubingen, Tubingen (Germany)

We present a detailed assessment of how well a future electron-ion collider could constrain helicity parton distributions in the nucleon and, therefore, unveil the role of the intrinsic spin of quarks and gluons in the proton’s spin budget. Any remaining deficit in this decomposition will provide the best indirect constraint on the contribution due to the total orbital angular momenta of quarks and gluons. Specifically, all our studies are performed in the context of global QCD analyses based on realistic pseudodata and in the light of the most recent data obtained from polarized proton-proton collisions at BNL-RHIC that have provided evidence for a significant gluon polarization in the accessible, albeit limited range of momentum fractions. We also present projections on what can be achieved on the gluon’s helicity distribution by the end of BNL-RHIC operations. As a result, all estimates of current and projected uncertainties are performed with the robust Lagrange multiplier technique.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC00112704; SC0012704

OSTI ID:: 1235888

Alternate ID(s):: OSTI ID: 1227038

Report Number(s):: BNL-111726-2016-JA; PRVDAQ; R&D Project: PO 004; KB0202012

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 92, Issue 9; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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The electron–ion collider: assessing the energy dependence of key measurements Aschenauer, E. C.; Fazio, S.; Lee, J. H. Reports on Progress in Physics, Vol. 82, Issue 2 https://doi.org/10.1088/1361-6633/aaf216	journal	January 2019
Towards ultimate parton distributions at the high-luminosity LHC Khalek, Rabah Abdul; Bailey, Shaun; Gao, Jun The European Physical Journal C, Vol. 78, Issue 11 https://doi.org/10.1140/epjc/s10052-018-6448-y	journal	November 2018
Towards Ultimate Parton Distributions at the High-Luminosity LHC Khalek, Rabah Abdul; Bailey, Shaun; Gao, Jun arXiv https://doi.org/10.48550/arxiv.1810.03639	text	January 2018
Monte Carlo sampling variant of the DSSV14 set of helicity parton densities de Florian, Daniel; Lucero, Gonzalo Agustin; Sassot, Rodolfo arXiv https://doi.org/10.48550/arxiv.1902.10548	text	January 2019

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