Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at 
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Abdallah, M. S.; Adam, J.; Adamczyk, L.; Adams, J. R.; Adkins, J. K.; Agakishiev, G.; Aggarwal, I.; Aggarwal, M. M.; Ahammed, Z.; Alekseev, I.; Anderson, D. M.; Aparin, A.; Aschenauer, E. C.; Ashraf, Muhammad Usman; Atetalla, F. G.; Attri, A.; Averichev, G. S.; Bairathi, V.; Baker, W.; Ball, J.; Barish, K. N.; Behera, A.; Bellwied, R.; Bhagat, P.; Bhasin, A.; Bielčík, J.; Bielčíková, J.; Bordyuzhin, I. G.; Brandenburg, J. D.; Brandin, A. V.; Bunzarov, I.; Butterworth, J.; Cai, X.; Caines, H.; Sánchez, M. Calderón De La Barca; Cebra, D.; Chakaberia, I.; Chaloupka, P.; Chan, B. K.; Chang, F-H.; Chang, Z.; Chankova-Bunzarova, N.; Chatterjee, A.; Chattopadhyay, S.; Chen, D.; Chen, J.; Chen, J. H.; Chen, X.; Chen, Z.; Cheng, J.; Chevalier, M.; Choudhury, S.; Christie, W.; Chu, X.; Crawford, H. J.; Csanád, M.; Daugherity, M.; Dedovich, T. G.; Deppner, I. M.; Derevschikov, A. A.; Dhamija, A.; Carlo, L. Di; Didenko, L.; Dong, X.; Drachenberg, J. L.; Dunlop, J. 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doi:10.1103/physrevd.103.l091103

Cited by 22 publications

(8 citation statements)

References 94 publications

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“…To determine the contribution of gluon polarization, a measurement of the helicity-dependent gluon distribution function, ∆g(x), especially in the small x region, is crucial. Evidence for a finite gluon polarization in the proton for x > 0.05 has been found by polarized pp collisions at RHIC [27]. However, the uncertainty on the overall gluon polarization is still rather large mainly because of the limitation in accessing the small x region.…”

Section: B Nucleon Spin and 3-d Structurementioning

confidence: 99%

A Muon-Ion Collider at BNL: the future QCD frontier and path to a new energy frontier of $μ^+μ^-$ colliders

Acosta,

2021

Preprint

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We propose the development and construction of a novel muon-ion collider (MuIC) at Brookhaven National Laboratory (BNL) in the USA as an upgrade to succeed the electron-ion collider (EIC) that is scheduled to commence in the early 2030s, by a joint effort of the nuclear and particle physics communities. The BNL facility could accommodate a muon storage beam with an energy up to about 1 TeV with existing magnet technology. When collided with a 275 GeV hadron beam, the MuIC center-of-mass energy of about 1 TeV will extend the kinematic coverage of deep inelastic scattering physics at the EIC (with polarized beams) by more than an order of magnitude in Q 2 and x, opening a new QCD frontier to address many fundamental scientific questions in nuclear and particle physics. This coverage is comparable to that of the proposed Large Hadron-Electron Collider (LHeC) at CERN, but with complementary lepton and hadron kinematics and beam polarization. Additionally, the development of a MuIC at BNL will focus the worldwide R&D efforts on muon collider technology and serve as a demonstrator toward a future muon-antimuon collider at O(10) TeV energies, which is an attractive option to reach the next high energy frontier in particle physics at an affordable cost and a smaller footprint than a future circular hadron collider. We discuss here the possible design parameters of the MuIC, kinematic coverage, science cases, and detector design considerations including estimates of resolutions on DIS kinematic variables. A possible road map toward the future MuIC and muon-antimuon colliders is also presented.

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Section: B Nucleon Spin and 3-d Structurementioning

confidence: 99%

A Muon-Ion Collider at BNL: the future QCD frontier and path to a new energy frontier of $μ^+μ^-$ colliders

Acosta,

2021

Preprint

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“…In contrast, the extraction of gluon helicity has matured to a somewhat more advanced stage, with jet production data available from polarized pp collisions at RHIC [17][18][19][20][21][22][23][24]. Inclusive jet cross sections offer direct sensitivity to the gluon momentum fraction and helicity distributions, without complications associated with final state hadronization [25].…”

Section: Introductionmentioning

confidence: 99%

How well do we know the gluon polarization in the proton?

Zhou,

Sato,

Melnitchouk

2022

Preprint

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We perform the first simultaneous global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs), including single jet production data from unpolarized and polarized hadron collisions. We critically assess the impact of SU(3) flavor symmetry and PDF positivity assumptions on the quark and gluon helicity PDFs, and find strong bias from these, particularly on the gluon polarization. The simultaneous analysis allows for the first time extraction of individual helicity-aligned and antialigned PDFs with a consistent treatment of uncertainties.

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“…Introduction.-Understanding the detailed decomposition of the proton spin into its constituent quark and gluon helicity and orbital angular momentum components promises to be one of the most significant accomplishments in nuclear and particle physics of this generation [1][2][3]. While the total light quark contributions to the helicity are well determined from polarized inclusive deep-inelastic scattering (DIS) data [4][5][6][7][8][9][10][11][12][13][14][15][16][17], and jet production in polarized pp collisions [18][19][20][21][22][23][24][25] provides constraints on the gluon helicity [26,27], far less is known about the polarization of the antiquark sea. There have been some intriguing hints of a polarized antiquark asymmetry, ∆ū − ∆ d, from polarized semi-inclusive DIS (SIDIS) measurements [28][29][30][31], in analogy with the spinaveraged ū − d asymmetry inferred from unpolarized DIS and Drell-Yan measurements [32][33][34][35][36].…”

mentioning

confidence: 99%

“…Beyond polarized lepton scattering, we describe jet production data in polarized pp collisions from STAR [18][19][20][21][22][23][24] and PHENIX [25], with a cut on the jet transverse momentum of 8 GeV [27]. We also include for the first time single-spin asymmetry A W L data from STAR [44] and A W/Z L from PHENIX [45,46], which provide the most direct constraints on the antiquark polarization.…”

mentioning

confidence: 99%

Polarized Antimatter in the Proton from Global QCD Analysis

C.¹,

Melnitchouk²,

Metz³

et al. 2022

Preprint

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We present a global QCD analysis of spin-dependent parton distribution functions (PDFs) that includes the latest polarized W -lepton production data from the STAR collaboration at RHIC. These data allow the first data-driven extraction of a nonzero polarized light quark sea asymmetry ∆ū−∆ d within a global QCD framework with minimal theoretical assumptions. Within our simultaneous extraction of polarized PDFs, unpolarized PDFs, and pion and kaon fragmentation functions, we also extract a self-consistent set of antiquark polarization ratios ∆ū/ū and ∆ d/ d.

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Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at s=200 GeV

Cited by 22 publications

References 94 publications

A Muon-Ion Collider at BNL: the future QCD frontier and path to a new energy frontier of $μ^+μ^-$ colliders

A Muon-Ion Collider at BNL: the future QCD frontier and path to a new energy frontier of $μ^+μ^-$ colliders

How well do we know the gluon polarization in the proton?

Polarized Antimatter in the Proton from Global QCD Analysis

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