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Evidence for Nonlinear Gluon Effects in QCD and Their Mass Number Dependence at STAR
- 1.0563839 - ÚJF 2023 RIV US eng J - Journal Article
Abdallah, M. S. - Aboona, B. E. - Adam, J. - Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Federič, Pavol - Holub, L. - Chaloupka, P. - Kosarzewski, L. K. - Kramárik, L. - Líčeník, Robert - Ponimatkin, Georgij - Prozorova, V. - Robotková, Monika - Rusňák, Jan - Šimko, Miroslav - Šumbera, Michal - Truhlář, T. - Trzeciak, B. A. - Vaněk, Jan … Total 400 authors
Evidence for Nonlinear Gluon Effects in QCD and Their Mass Number Dependence at STAR.
Physical Review Letters. Roč. 129, č. 9 (2022), č. článku 092501. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LTT18002; GA MŠMT LM2018109
Institutional support: RVO:61389005
Keywords : STAR collaboration * heavy ion experiment
OECD category: Particles and field physics
Impact factor: 8.6, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevLett.129.092501
The STAR Collaboration reports measurements of back-to-back azimuthal correlations of di-pi(0)s produced at forward pseudorapidities (2.6 < eta < 4.0) in p + p, p + Al, and p + Au collisions at a center-of-mass energy of 200 GeV. We observe a clear suppression of the correlated yields of back-to-back pi(0) pairs in p + Al and p + Au collisions compared to the p + p data. The observed suppression of back-to-back pairs as a function of transverse momentum suggests nonlinear gluon dynamics arising at high parton densities. The larger suppression found in p + Au relative to p + Al collisions exhibits a dependence of the saturation scale Q(s)(2) on the mass number A. A linear scaling of the suppression with A(1/3) is observed with a slope of -0.09 +/- 0.01.
Permanent Link: https://hdl.handle.net/11104/0335630
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