Your browser doesn't support javascript.
loading
Observation of Excess J/ψ Yield at Very Low Transverse Momenta in Au+Au Collisions at sqrt[s_{NN}]=200 GeV and U+U Collisions at sqrt[s_{NN}]=193 GeV.
Adam, J; Adamczyk, L; Adams, J R; Adkins, J K; Agakishiev, G; Aggarwal, M M; Ahammed, Z; Alekseev, I; Anderson, D M; Aoyama, R; Aparin, A; Arkhipkin, D; Aschenauer, E C; Ashraf, M U; Atetalla, F; Attri, A; Averichev, G S; Bairathi, V; Barish, K; Bassill, A J; Behera, A; Bellwied, R; Bhasin, A; Bhati, A K; Bielcik, J; Bielcikova, J; Bland, L C; Bordyuzhin, I G; Brandenburg, J D; Brandin, A V; Bryslawskyj, J; Bunzarov, I; Butterworth, J; 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, J H; Chen, X; Cheng, J; Cherney, M; Christie, W; Crawford, H J.
Afiliação
  • Adam J; Creighton University, Omaha, Nebraska 68178.
  • Adamczyk L; AGH University of Science and Technology, FPACS, Cracow 30-059, Poland.
  • Adams JR; Ohio State University, Columbus, Ohio 43210.
  • Adkins JK; University of Kentucky, Lexington, Kentucky 40506-0055.
  • Agakishiev G; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Aggarwal MM; Panjab University, Chandigarh 160014, India.
  • Ahammed Z; Variable Energy Cyclotron Centre, Kolkata 700064, India.
  • Alekseev I; Alikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, Russia.
  • Anderson DM; National Research Nuclear University MEPhI, Moscow 115409, Russia.
  • Aoyama R; Texas A&M University, College Station, Texas 77843.
  • Aparin A; University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
  • Arkhipkin D; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Aschenauer EC; Brookhaven National Laboratory, Upton, New York 11973.
  • Ashraf MU; Brookhaven National Laboratory, Upton, New York 11973.
  • Atetalla F; Tsinghua University, Beijing 100084.
  • Attri A; Kent State University, Kent, Ohio 44242.
  • Averichev GS; Panjab University, Chandigarh 160014, India.
  • Bairathi V; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Barish K; National Institute of Science Education and Research, HBNI, Jatni 752050, India.
  • Bassill AJ; University of California, Riverside, California 92521.
  • Behera A; University of California, Riverside, California 92521.
  • Bellwied R; State University of New York, Stony Brook, New York 11794.
  • Bhasin A; University of Houston, Houston, Texas 77204.
  • Bhati AK; University of Jammu, Jammu 180001, India.
  • Bielcik J; Panjab University, Chandigarh 160014, India.
  • Bielcikova J; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic.
  • Bland LC; Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic.
  • Bordyuzhin IG; Brookhaven National Laboratory, Upton, New York 11973.
  • Brandenburg JD; Alikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, Russia.
  • Brandin AV; Brookhaven National Laboratory, Upton, New York 11973.
  • Bryslawskyj J; National Research Nuclear University MEPhI, Moscow 115409, Russia.
  • Bunzarov I; University of California, Riverside, California 92521.
  • Butterworth J; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Caines H; Rice University, Houston, Texas 77251.
  • Sánchez MCB; Yale University, New Haven, Connecticut 06520.
  • Cebra D; University of California, Davis, California 95616.
  • Chakaberia I; University of California, Davis, California 95616.
  • Chaloupka P; Kent State University, Kent, Ohio 44242.
  • Chan BK; Shandong University, Qingdao, Shandong 266237.
  • Chang FH; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic.
  • Chang Z; University of California, Los Angeles, California 90095.
  • Chankova-Bunzarova N; National Cheng Kung University, Tainan 70101, Taiwan.
  • Chatterjee A; Brookhaven National Laboratory, Upton, New York 11973.
  • Chattopadhyay S; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Chen JH; Variable Energy Cyclotron Centre, Kolkata 700064, India.
  • Chen X; Variable Energy Cyclotron Centre, Kolkata 700064, India.
  • Cheng J; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800.
  • Cherney M; University of Science and Technology of China, Hefei, Anhui 230026.
  • Christie W; Tsinghua University, Beijing 100084.
  • Crawford HJ; Creighton University, Omaha, Nebraska 68178.
Phys Rev Lett ; 123(13): 132302, 2019 Sep 27.
Article em En | MEDLINE | ID: mdl-31697545
ABSTRACT
We report on the first measurements of J/ψ production at very low transverse momentum (p_{T}<0.2 GeV/c) in hadronic Au+Au collisions at sqrt[s_{NN}]=200 GeV and U+U collisions at sqrt[s_{NN}]=193 GeV. Remarkably, the inferred nuclear modification factor of J/ψ at midrapidity in Au+Au (U+U) collisions reaches about 24 (52) for p_{T}<0.05 GeV/c in the 60%-80% collision centrality class. This noteworthy enhancement cannot be explained by hadronic production accompanied by cold and hot medium effects. In addition, the dN/dt distribution of J/ψ for the very low p_{T} range is presented for the first time. The distribution is consistent with that expected from the Au nucleus and shows a hint of interference. Comparison of the measurements to theoretical calculations of coherent production shows that the excess yield can be described reasonably well and reveals a partial disruption of coherent production in semicentral collisions, perhaps due to the violent hadronic interactions. Incorporating theoretical calculations, the results strongly suggest that the dramatic enhancement of J/ψ yield observed at extremely low p_{T} originates from coherent photon-nucleus interactions. In particular, coherently produced J/ψ's in violent hadronic collisions may provide a novel probe of the quark-gluon plasma.
Texto completo
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article
Texto completo
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article