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Phys Rev Lett. 2021 Dec 24;127(26):262301. doi: 10.1103/PhysRevLett.127.262301.

Measurement of the Sixth-Order Cumulant of Net-Proton Multiplicity Distributions in Au+Au Collisions at sqrt[s_{NN}]=27, 54.4, and 200 GeV at RHIC.

Physical review letters

M S Abdallah, J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, I Aggarwal, M M Aggarwal, Z Ahammed, I Alekseev, D M Anderson, A Aparin, E C Aschenauer, M U Ashraf, F G Atetalla, A Attri, G S Averichev, V Bairathi, W Baker, J G Ball Cap, K Barish, A Behera, R Bellwied, P Bhagat, A Bhasin, J Bielcik, J Bielcikova, I G Bordyuzhin, J D Brandenburg, A V Brandin, I Bunzarov, J Butterworth, X Z Cai, H Caines, M Calderón de la Barca Sánchez, D Cebra, I Chakaberia, P Chaloupka, B K Chan, F-H Chang, Z Chang, N Chankova-Bunzarova, A Chatterjee, S Chattopadhyay, D Chen, J Chen, J H Chen, X Chen, Z Chen, J Cheng, M Chevalier, S Choudhury, W Christie, X Chu, H J Crawford, M Csanád, M Daugherity, T G Dedovich, I M Deppner, A A Derevschikov, A Dhamija, L Di Carlo, L Didenko, X Dong, J L Drachenberg, E Duckworth, J C Dunlop, N Elsey, J Engelage, G Eppley, S Esumi, O Evdokimov, A Ewigleben, O Eyser, R Fatemi, F M Fawzi, S Fazio, P Federic, J Fedorisin, C J Feng, Y Feng, P Filip, E Finch, Y Fisyak, A Francisco, C Fu, L Fulek, C A Gagliardi, T Galatyuk, F Geurts, N Ghimire, A Gibson, K Gopal, X Gou, D Grosnick, A Gupta, W Guryn, A I Hamad, A Hamed, Y Han, S Harabasz, M D Harasty, J W Harris, H Harrison, S He, W He, X H He, Y He, S Heppelmann, S Heppelmann, N Herrmann, E Hoffman, L Holub, Y Hu, H Huang, H Z Huang, S L Huang, T Huang, X Huang, Y Huang, T J Humanic, G Igo, D Isenhower, W W Jacobs, C Jena, A Jentsch, Y Ji, J Jia, K Jiang, X Ju, E G Judd, S Kabana, M L Kabir, S Kagamaster, D Kalinkin, K Kang, D Kapukchyan, K Kauder, H W Ke, D Keane, A Kechechyan, Y V Khyzhniak, D P Kikoła, C Kim, B Kimelman, D Kincses, I Kisel, A Kiselev, A G Knospe, L Kochenda, L K Kosarzewski, L Kramarik, P Kravtsov, L Kumar, S Kumar, R Kunnawalkam Elayavalli, J H Kwasizur, R Lacey, S Lan, J M Landgraf, J Lauret, A Lebedev, R Lednicky, J H Lee, Y H Leung, C Li, C Li, W Li, X Li, Y Li, X Liang, Y Liang, R Licenik, T Lin, Y Lin, M A Lisa, F Liu, H Liu, H Liu, P Liu, T Liu, X Liu, Y Liu, Z Liu, T Ljubicic, W J Llope, R S Longacre, E Loyd, N S Lukow, X Luo, L Ma, R Ma, Y G Ma, N Magdy, R Majka, D Mallick, S Margetis, C Markert, H S Matis, J A Mazer, N G Minaev, S Mioduszewski, B Mohanty, M M Mondal, I Mooney, D A Morozov, A Mukherjee, M Nagy, J D Nam, Md Nasim, K Nayak, D Neff, J M Nelson, D B Nemes, M Nie, G Nigmatkulov, T Niida, R Nishitani, L V Nogach, T Nonaka, A S Nunes, G Odyniec, A Ogawa, S Oh, V A Okorokov, B S Page, R Pak, A Pandav, A K Pandey, Y Panebratsev, P Parfenov, B Pawlik, D Pawlowska, H Pei, C Perkins, L Pinsky, R L Pintér, J Pluta, B R Pokhrel, G Ponimatkin, J Porter, M Posik, V Prozorova, N K Pruthi, M Przybycien, J Putschke, H Qiu, A Quintero, C Racz, S K Radhakrishnan, N Raha, R L Ray, R Reed, H G Ritter, M Robotkova, O V Rogachevskiy, J L Romero, L Ruan, J Rusnak, N R Sahoo, H Sako, S Salur, J Sandweiss, S Sato, W B Schmidke, N Schmitz, B R Schweid, F Seck, J Seger, M Sergeeva, R Seto, P Seyboth, N Shah, E Shahaliev, P V Shanmuganathan, M Shao, T Shao, A I Sheikh, D Shen, S S Shi, Y Shi, Q Y Shou, E P Sichtermann, R Sikora, M Simko, J Singh, S Singha, M J Skoby, N Smirnov, Y Söhngen, W Solyst, P Sorensen, H M Spinka, B Srivastava, T D S Stanislaus, M Stefaniak, D J Stewart, M Strikhanov, B Stringfellow, A A P Suaide, M Sumbera, B Summa, X M Sun, X Sun, Y Sun, Y Sun, B Surrow, D N Svirida, Z W Sweger, P Szymanski, A H Tang, Z Tang, A Taranenko, T Tarnowsky, J H Thomas, A R Timmins, D Tlusty, T Todoroki, M Tokarev, C A Tomkiel, S Trentalange, R E Tribble, P Tribedy, S K Tripathy, T Truhlar, B A Trzeciak, O D Tsai, Z Tu, T Ullrich, D G Underwood, I Upsal, G Van Buren, J Vanek, A N Vasiliev, I Vassiliev, V Verkest, F Videbæk, S Vokal, S A Voloshin, F Wang, G Wang, J S Wang, P Wang, Y Wang, Y Wang, Z Wang, J C Webb, P C Weidenkaff, L Wen, G D Westfall, H Wieman, S W Wissink, J Wu, Y Wu, B Xi, Z G Xiao, G Xie, W Xie, H Xu, N Xu, Q H Xu, Y Xu, Z Xu, Z Xu, C Yang, Q Yang, S Yang, Y Yang, Z Ye, Z Ye, L Yi, K Yip, Y Yu, H Zbroszczyk, W Zha, C Zhang, D Zhang, J Zhang, S Zhang, S Zhang, X P Zhang, Y Zhang, Y Zhang, Y Zhang, Z J Zhang, Z Zhang, Z Zhang, J Zhao, C Zhou, X Zhu, Z Zhu, M Zurek, M Zyzak,

Affiliations

  1. American University of Cairo, New Cairo 11835, New Cairo, Egypt.
  2. Brookhaven National Laboratory, Upton, New York 11973.
  3. AGH University of Science and Technology, FPACS, Cracow 30-059, Poland.
  4. Ohio State University, Columbus, Ohio 43210.
  5. University of Kentucky, Lexington, Kentucky 40506-0055.
  6. Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  7. Panjab University, Chandigarh 160014, India.
  8. Variable Energy Cyclotron Centre, Kolkata 700064, India.
  9. Alikhanov Institute for Theoretical and Experimental Physics NRC "Kurchatov Institute," Moscow 117218, Russia.
  10. National Research Nuclear University MEPhI, Moscow 115409, Russia.
  11. Texas A&M University, College Station, Texas 77843.
  12. Central China Normal University, Wuhan, Hubei 430079.
  13. Kent State University, Kent, Ohio 44242.
  14. Instituto de Alta Investigación, Universidad de Tarapacá, Arica 1000000, Chile.
  15. University of California, Riverside, California 92521.
  16. University of Houston, Houston, Texas 77204.
  17. State University of New York, Stony Brook, New York 11794.
  18. University of Jammu, Jammu 180001, India.
  19. Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic.
  20. Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic.
  21. Rice University, Houston, Texas 77251.
  22. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800.
  23. Yale University, New Haven, Connecticut 06520.
  24. University of California, Davis, California 95616.
  25. Lawrence Berkeley National Laboratory, Berkeley, California 94720.
  26. University of California, Los Angeles, California 90095.
  27. National Cheng Kung University, Tainan 70101.
  28. Shandong University, Qingdao, Shandong 266237.
  29. Fudan University, Shanghai, 200433.
  30. University of Science and Technology of China, Hefei, Anhui 230026.
  31. Tsinghua University, Beijing 100084.
  32. University of California, Berkeley, California 94720.
  33. ELTE Eötvös Loránd University, Budapest, Hungary H-1117.
  34. Abilene Christian University, Abilene, Texas 79699.
  35. University of Heidelberg, Heidelberg 69120, Germany.
  36. NRC "Kurchatov Institute," Institute of High Energy Physics, Protvino 142281, Russia.
  37. Wayne State University, Detroit, Michigan 48201.
  38. University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
  39. University of Illinois at Chicago, Chicago, Illinois 60607.
  40. Lehigh University, Bethlehem, Pennsylvania 18015.
  41. Purdue University, West Lafayette, Indiana 47907.
  42. Southern Connecticut State University, New Haven, Connecticut 06515.
  43. Technische Universität Darmstadt, Darmstadt 64289, Germany.
  44. Temple University, Philadelphia, Pennsylvania 19122.
  45. Valparaiso University, Valparaiso, Indiana 46383.
  46. Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati 517507, India.
  47. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000.
  48. Pennsylvania State University, University Park, Pennsylvania 16802.
  49. Indiana University, Bloomington, Indiana 47408.
  50. Warsaw University of Technology, Warsaw 00-661, Poland.
  51. Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany.
  52. National Institute of Science Education and Research, HBNI, Jatni 752050, India.
  53. University of Texas, Austin, Texas 78712.
  54. Rutgers University, Piscataway, New Jersey 08854.
  55. Indian Institute of Science Education and Research (IISER), Berhampur 760010, India.
  56. Institute of Nuclear Physics PAN, Cracow 31-342, Poland.
  57. Max-Planck-Institut für Physik, Munich 80805, Germany.
  58. Creighton University, Omaha, Nebraska 68178.
  59. Indian Institute Technology, Patna, Bihar 801106, India.
  60. Argonne National Laboratory, Argonne, Illinois 60439.
  61. Universidade de São Paulo, São Paulo, Brazil 05314-970.
  62. Huzhou University, Huzhou, Zhejiang 313000.
  63. Michigan State University, East Lansing, Michigan 48824.

PMID: 35029466 DOI: 10.1103/PhysRevLett.127.262301

Abstract

According to first-principle lattice QCD calculations, the transition from quark-gluon plasma to hadronic matter is a smooth crossover in the region μ_{B}≤T_{c}. In this range the ratio, C_{6}/C_{2}, of net-baryon distributions are predicted to be negative. In this Letter, we report the first measurement of the midrapidity net-proton C_{6}/C_{2} from 27, 54.4, and 200 GeV Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). The dependence on collision centrality and kinematic acceptance in (p_{T}, y) are analyzed. While for 27 and 54.4 GeV collisions the C_{6}/C_{2} values are close to zero within uncertainties, it is observed that for 200 GeV collisions, the C_{6}/C_{2} ratio becomes progressively negative from peripheral to central collisions. Transport model calculations without critical dynamics predict mostly positive values except for the most central collisions within uncertainties. These observations seem to favor a smooth crossover in the high-energy nuclear collisions at top RHIC energy.

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