Observation of Strong Nuclear Suppression in Exclusive <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:mrow></mml:math> Photoproduction in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Au</mml:mi><mml:mo stretchy="false">+</mml:mo><mml:mi>Au</mml:mi></mml:mrow></mml:math> Ultraperipheral Collisions at RHIC
M. I. AbdulhamidAmerican University in CairoB. E. AboonaTexas A&M UniversityJ. AdamCzech Technical University in PragueL. AdamczykAGH University of KrakowJ. R. AdamsThe Ohio State UniversityI. AggarwalPanjab UniversityM. M. AggarwalArgonne National Laboratory, Argonne, Illinois 60439Z. AhammedPanjab University, Chandigarh 160014, IndiaE. C. AschenauerBrookhaven National LaboratorySaba AslamIndian Institute TechnologyJennifer AtchisonAbilene Christian UniversityV. BairathiUniversidad de TarapacáJ. BallUniversity of HoustonK. N. BarishUniversity of CaliforniaR. BellwiedUniversity of HoustonP. BhagatUniversity of JammuA. BhasinUniversity of JammuS. BhattaState University of New YorkS. R. BhosaleELTE Eötvös Loránd UniversityJ. BielčíkCzech Technical University in PragueJ. BielčíkováNuclear Physics Institute of the CASJ. D. BrandenburgThe Ohio State UniversityC. BroodoUniversity of HoustonX. Z. CaiShanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800M. Calderón de la Barca SánchezUniversity of CaliforniaD. CebraUniversity of CaliforniaJ. CeskaCzech Technical University in PragueI. ChakaberiaLawrence Berkeley National LaboratoryP. ChaloupkaCzech Technical University in PragueB. K. ChanUniversity of California, Los Angeles, California 90095Z. ChangIndiana UniversityA. ChatterjeeNational Institute of Technology DurgapurD. ChenUniversity of CaliforniaJian ChenFudan UniversityJ. H. ChenArgonne National Laboratory, Argonne, Illinois 60439Z. ChenShandong UniversityJ. ChengShandong University, Qingdao, Shandong 266237Y. ChengUniversity of California, Los Angeles, California 90095S. ChoudhuryFudan UniversityW. ChristieBrookhaven National LaboratoryX. ChuBrookhaven National LaboratoryH. J. CrawfordUniversity of California, Berkeley, California 94720M. CsanádELTE Eötvös Loránd UniversityG. Dale-GauUniversity of Illinois at ChicagoArkaprava DasCzech Technical University in PragueI. M. DeppnerUniversity of HeidelbergA. DhamijaPanjab UniversityP. DixitIndian Institute of Science Education and Research, TirupatiX. DongLawrence Berkeley National LaboratoryJ. L. DrachenbergAbilene Christian UniversityE. DuckworthKent State UniversityJ. C. DunlopBrookhaven National LaboratoryJ. EngelageUniversity of California, Berkeley, California 94720G. EppleyRice UniversityS. EsumiUniversity of TsukubaO. EvdokimovUniversity of Illinois at ChicagoO. EyserBrookhaven National LaboratoryR. FatemiUniversity of KentuckyS. FazioUniversity of Calabria & INFN-CosenzaC. FengNational Cheng Kung UniversityY. FengPurdue UniversityE. FinchSouthern Connecticut State UniversityY. FisyakBrookhaven National LaboratoryF. A. FlorArgonne National Laboratory, Argonne, Illinois 60439C. FuInstitute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000C. A. GagliardiTexas A&M University, College Station, Texas 77843T. GalatyukTechnische Universität DarmstadtTong GaoShandong UniversityF. J. M. GeurtsRice UniversityN. GhimireTemple University, Philadelphia, Pennsylvania 19122S. M. GibsonArgonne National Laboratory, Argonne, Illinois 60439K. GopalIndian Institute of Science Education and Research (IISER) TirupatiX. GouBall State University, Muncie, Indiana, 47306D. GrosnickValparaiso UniversityA. GuptaUniversity of JammuW. GurynBall State University, Muncie, Indiana, 47306A. HamedBall State University, Muncie, Indiana, 47306Y. HanBall State University, Muncie, Indiana, 47306S. HarabaszArgonne National Laboratory, Argonne, Illinois 60439M. D. HarastyUniversity of CaliforniaJ. W. HarrisYale UniversityH. Harrison-SmithUniversity of KentuckyW. HeFudan UniversityX. H. HeChinese Academy of SciencesY. HeBall State University, Muncie, Indiana, 47306N. HerrmannUniversity of Heidelberg, Heidelberg 69120, GermanyL. HolubCzech Technical University in PragueC. HuUnited States Naval AcademyQ. HuArgonne National Laboratory, Argonne, Illinois 60439Y. HuLawrence Berkeley National LaboratoryH. Z. HuangNational Cheng Kung UniversityS. L. HuangTsinghua University, Beijing 100084T. HuangUniversity of Illinois at ChicagoX. HuangTsinghua UniversityY. HuangTsinghua UniversityT. J. HumanicThe Ohio State UniversityM. IsshikiUniversity of Tsukuba
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We report a measurement of exclusive $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2s)$ photoproduction in $\mathrm{Au}+\mathrm{Au}$ ultraperipheral collisions at $\sqrt{{s}_{\mathrm{NN}}}=200\text{ }\text{ }\mathrm{GeV}$ using the STAR detector. For the first time, (i) the $\ensuremath{\psi}(2s)$ 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 $J/\ensuremath{\psi}$ production. At average photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent $J/\ensuremath{\psi}$ cross sections of Au nuclei are found to be $71\ifmmode\pm\else\textpm\fi{}10%$ and $36\ifmmode\pm\else\textpm\fi{}7%$, 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.
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