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Evidence for Nonlinear Gluon Effects in QCD and Their Mass Number Dependence at STAR

. 2022 Aug 26 ; 129 (9) : 092501.

Status PubMed-not-MEDLINE Language English Country United States Media print

Document type Journal Article

The STAR Collaboration reports measurements of back-to-back azimuthal correlations of di-π^{0}s produced at forward pseudorapidities (2.6<η<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 π^{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.

Abilene Christian University Abilene Texas 79699

AGH University of Science and Technology FPACS Cracow 30 059 Poland

Alikhanov Institute for Theoretical and Experimental Physics NRC Kurchatov Institute Moscow 117218

American University of Cairo New Cairo 11835 New Cairo Egypt

Argonne National Laboratory Argonne Illinois 60439

Brookhaven National Laboratory Upton New York 11973

Central China Normal University Wuhan Hubei 430079

Creighton University Omaha Nebraska 68178

Czech Technical University Prague FNSPE Prague 115 19 Czech Republic

ELTE Eötvös Loránd University Budapest Hungary H 1117

Frankfurt Institute for Advanced Studies FIAS Frankfurt 60438 Germany

Fudan University Shanghai 200433

Huzhou University Huzhou Zhejiang 313000

Indian Institute of Science Education and Research Berhampur 760010 India

Indian Institute of Science Education and Research Tirupati Tirupati 517507 India

Indian Institute Technology Patna Bihar 801106 India

Indiana University Bloomington Indiana 47408

Institute of Modern Physics Chinese Academy of Sciences Lanzhou Gansu 730000

Institute of Nuclear Physics PAN Cracow 31 342 Poland

Instituto de Alta Investigación Universidad de Tarapacá Arica 1000000 Chile

Joint Institute for Nuclear Research Dubna 141 980

Kent State University Kent Ohio 44242

Lawrence Berkeley National Laboratory Berkeley California 94720

Lehigh University Bethlehem Pennsylvania 18015

Max Planck Institut für Physik Munich 80805 Germany

Michigan State University East Lansing Michigan 48824

National Cheng Kung University Tainan 70101

National Institute of Science Education and Research HBNI Jatni 752050 India

National Research Nuclear University MEPhI Moscow 115409

NRC Kurchatov Institute Institute of High Energy Physics Protvino 142281

Nuclear Physics Institute of the CAS Rez 250 68 Czech Republic

Panjab University Chandigarh 160014 India

Pennsylvania State University University Park Pennsylvania 16802

Purdue University West Lafayette Indiana 47907

Rice University Houston Texas 77251

Rutgers University Piscataway New Jersey 08854

Shandong University Qingdao Shandong 266237

Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800

Southern Connecticut State University New Haven Connecticut 06515

State University of New York Stony Brook New York 11794

Technische Universität Darmstadt Darmstadt 64289 Germany

Temple University Philadelphia Pennsylvania 19122

Texas A and M University College Station Texas 77843

The Ohio State University Columbus Ohio 43210

Tsinghua University Beijing 100084

Universidade de São Paulo São Paulo Brazil 05314 970

University of California Berkeley California 94720

University of California Davis California 95616

University of California Los Angeles California 90095

University of California Riverside California 92521

University of Heidelberg Heidelberg 69120 Germany

University of Houston Houston Texas 77204

University of Illinois at Chicago Chicago Illinois 60607

University of Jammu Jammu 180001 India

University of Kentucky Lexington Kentucky 40506 0055

University of Science and Technology of China Hefei Anhui 230026

University of Texas Austin Texas 78712

University of Tsukuba Tsukuba Ibaraki 305 8571 Japan

Valparaiso University Valparaiso Indiana 46383

Variable Energy Cyclotron Centre Kolkata 700064 India

Warsaw University of Technology Warsaw 00 661 Poland

Wayne State University Detroit Michigan 48201

Yale University New Haven Connecticut 06520

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