Observation of Strong Nuclear Suppression in Exclusive J/ψ Photoproduction in Au+Au Ultraperipheral Collisions at RHIC

. 2024 Aug 02 ; 133 (5) : 052301.

Status PubMed-not-MEDLINE Jazyk angličtina Země Spojené státy americké Médium print

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid39159117

We report a measurement of exclusive J/ψ and ψ(2s) photoproduction in Au+Au ultraperipheral collisions at sqrt[s_{NN}]=200 GeV using the STAR detector. For the first time, (i) the ψ(2s) photoproduction in midrapidity at the Relativistic Heavy-Ion Collider has been experimentally measured; (ii) nuclear suppression factors are measured for both the coherent and incoherent J/ψ production. At average photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent J/ψ cross sections of Au nuclei are found to be 71±10% and 36±7%, respectively, of that of free protons. The stronger suppression observed in the incoherent production provides a new experimental handle to study the initial-state parton density in heavy nuclei. Data are compared with theoretical models quantitatively.

<a href= https ror org 02ex6cf31 >Brookhaven National Laboratory< a> Upton New York 11973

Abilene Christian University Abilene Texas 79699

AGH University of Krakow FPACS Cracow 30 059 Poland

American University in Cairo New Cairo 11835 Egypt

Argonne National Laboratory Argonne Illinois 60439

Ball State University Muncie Indiana 47306

Central China Normal University Wuhan Hubei 430079

Chongqing University Chongqing 401331

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

Guangxi Normal University Guilin 541004

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

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 Institute of Technology Durgapur Durgapur 713209 India

Nuclear Physics Institute of the CAS Rez 250 68 Czech Republic

Panjab University Chandigarh 160014 India

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Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800

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Technische Universität Darmstadt Darmstadt 64289 Germany

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United States Naval Academy Annapolis Maryland 21402

University of Calabria and INFN Cosenza Rende 87036 Italy

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University of California Los Angeles California 90095

University of California Riverside California 92521

University of Chinese Academy of Sciences Beijing 101408

University of Heidelberg Heidelberg 69120 Germany

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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

Wuhan University of Science and Technology Wuhan Hubei 430065

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