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. 2024 Aug 2;133(5):052301.
doi: 10.1103/PhysRevLett.133.052301.

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

M I Abdulhamid  1 B E Aboona  2 J Adam  3 L Adamczyk  4 J R Adams  5 I Aggarwal  6 M M Aggarwal  6 Z Ahammed  7 E C Aschenauer  8 S Aslam  9 J Atchison  10 V Bairathi  11 J G Ball Cap  12 K Barish  13 R Bellwied  12 P Bhagat  14 A Bhasin  14 S Bhatta  15 S R Bhosale  16 J Bielcik  3 J Bielcikova  17 J D Brandenburg  5 C Broodo  12 X Z Cai  18 H Caines  19 M Calderón de la Barca Sánchez  20 D Cebra  20 J Ceska  3 I Chakaberia  21 P Chaloupka  3 B K Chan  22 Z Chang  23 A Chatterjee  24 D Chen  13 J Chen  25 J H Chen  26 Z Chen  25 J Cheng  27 Y Cheng  22 S Choudhury  26 W Christie  8 X Chu  8 H J Crawford  28 M Csanád  16 G Dale-Gau  29 A Das  3 I M Deppner  30 A Dhamija  6 P Dixit  31 X Dong  21 J L Drachenberg  10 E Duckworth  32 J C Dunlop  8 J Engelage  28 G Eppley  33 S Esumi  34 O Evdokimov  29 O Eyser  8 R Fatemi  35 S Fazio  36 C J Feng  37 Y Feng  38 E Finch  39 Y Fisyak  8 F A Flor  19 C Fu  40 C A Gagliardi  2 T Galatyuk  41 T Gao  25 F Geurts  33 N Ghimire  42 A Gibson  43 K Gopal  44 X Gou  25 D Grosnick  43 A Gupta  14 W Guryn  8 A Hamed  1 Y Han  33 S Harabasz  41 M D Harasty  20 J W Harris  19 H Harrison-Smith  35 W He  26 X H He  40 Y He  25 N Herrmann  30 L Holub  3 C Hu  45 Q Hu  40 Y Hu  21 H Huang  37 H Z Huang  22 S L Huang  15 T Huang  29 X Huang  27 Y Huang  27 Y Huang  46 T J Humanic  5 M Isshiki  34 W W Jacobs  23 A Jalotra  14 C Jena  44 A Jentsch  8 Y Ji  21 J Jia  8   15 C Jin  33 X Ju  47 E G Judd  28 S Kabana  11 D Kalinkin  35 K Kang  27 D Kapukchyan  13 K Kauder  8 D Keane  32 A Khanal  48 Y V Khyzhniak  5 D P Kikoła  49 D Kincses  16 I Kisel  50 A Kiselev  8 A G Knospe  51 H S Ko  21 L K Kosarzewski  5 L Kumar  6 M C Labonte  20 R Lacey  15 J M Landgraf  8 J Lauret  8 A Lebedev  8 J H Lee  8 Y H Leung  30 N Lewis  8 C Li  25 D Li  47 H-S Li  38 H Li  52 W Li  33 X Li  47 Y Li  47 Y Li  27 Z Li  47 X Liang  13 Y Liang  32 R Licenik  3   17 T Lin  25 Y Lin  53 M A Lisa  5 C Liu  40 G Liu  54 H Liu  46 L Liu  46 T Liu  19 X Liu  5 Y Liu  2 Z Liu  46 T Ljubicic  33 O Lomicky  3 R S Longacre  8 E M Loyd  13 T Lu  40 J Luo  47 X F Luo  46 L Ma  26 R Ma  8 Y G Ma  26 N Magdy  15 D Mallick  49 R Manikandhan  12 S Margetis  32 C Markert  55 G McNamara  48 O Mezhanska  3 K Mi  46 S Mioduszewski  2 B Mohanty  56 M M Mondal  56 I Mooney  19 J Mrazkova  3   17 M I Nagy  16 A S Nain  6 J D Nam  42 M Nasim  31 D Neff  22 J M Nelson  28 D B Nemes  19 M Nie  25 G Nigmatkulov  29 T Niida  34 T Nonaka  34 G Odyniec  21 A Ogawa  8 S Oh  57 K Okubo  34 B S Page  8 R Pak  8 S Pal  3 A Pandav  21 A K Pandey  40 T Pani  58 A Paul  13 B Pawlik  59 D Pawlowska  49 C Perkins  28 J Pluta  49 B R Pokhrel  42 M Posik  42 T Protzman  51 V Prozorova  3 N K Pruthi  6 M Przybycien  4 J Putschke  48 Z Qin  27 H Qiu  40 C Racz  13 S K Radhakrishnan  32 A Rana  6 R L Ray  55 R Reed  51 C W Robertson  38 M Robotkova  3   17 M A Rosales Aguilar  35 D Roy  58 P Roy Chowdhury  49 L Ruan  8 A K Sahoo  31 N R Sahoo  44 H Sako  34 S Salur  58 S Sato  34 B C Schaefer  51 W B Schmidke  8 N Schmitz  60 F-J Seck  41 J Seger  61 R Seto  13 P Seyboth  60 N Shah  9 P V Shanmuganathan  8 T Shao  26 M Sharma  14 N Sharma  31 R Sharma  44 S R Sharma  44 A I Sheikh  32 D Shen  25 D Y Shen  26 K Shen  47 S S Shi  46 Y Shi  25 Q Y Shou  26 F Si  47 J Singh  6 S Singha  40 P Sinha  44 M J Skoby  62   38 N Smirnov  19 Y Söhngen  30 Y Song  19 B Srivastava  38 T D S Stanislaus  43 M Stefaniak  5 D J Stewart  48 Y Su  47 M Sumbera  17 C Sun  15 X Sun  40 Y Sun  47 Y Sun  63 B Surrow  42 M Svoboda  3   17 Z W Sweger  20 A C Tamis  19 A H Tang  8 Z Tang  47 T Tarnowsky  64 J H Thomas  21 A R Timmins  12 D Tlusty  61 T Todoroki  34 S Trentalange  22 P Tribedy  8 S K Tripathy  49 T Truhlar  3 B A Trzeciak  3 O D Tsai  8   22 C Y Tsang  8   32 Z Tu  8 J Tyler  2 T Ullrich  8 D G Underwood  65   43 I Upsal  47 G Van Buren  8 J Vanek  8 I Vassiliev  50 V Verkest  48 F Videbæk  8 S A Voloshin  48 F Wang  38 G Wang  22 J S Wang  63 J Wang  25 K Wang  47 X Wang  25 Y Wang  47 Y Wang  46 Y Wang  27 Z Wang  25 J C Webb  8 P C Weidenkaff  30 G D Westfall  64 D Wielanek  49 H Wieman  21 G Wilks  29 S W Wissink  23 R Witt  66 J Wu  46 J Wu  40 X Wu  22 X Wu  47 B Xi  26 Z G Xiao  27 G Xie  45 W Xie  38 H Xu  63 N Xu  21 Q H Xu  25 Y Xu  25 Y Xu  46 Z Xu  32 Z Xu  22 G Yan  25 Z Yan  15 C Yang  25 Q Yang  25 S Yang  54 Y Yang  37 Z Ye  33 Z Ye  21 L Yi  25 K Yip  8 Y Yu  25 H Zbroszczyk  49 W Zha  47 C Zhang  26 D Zhang  54 J Zhang  25 S Zhang  67 W Zhang  54 X Zhang  40 Y Zhang  40 Y Zhang  47 Y Zhang  25 Y Zhang  46 Z J Zhang  37 Z Zhang  8 Z Zhang  29 F Zhao  40 J Zhao  26 M Zhao  8 J Zhou  47 S Zhou  46 Y Zhou  46 X Zhu  27 M Zurek  65   8 M Zyzak  50 STAR Collaboration
Affiliations

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

M I Abdulhamid et al. Phys Rev Lett. .

Abstract

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.

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