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Upsilon production in U+U collisions at 193 GeV with the STAR experiment

We present a measurement of the inclusive production of Upsilon mesons in U+U collisions at 193 GeV at mid-rapidity (|y| < 1). Previous studies in central Au+Au collisions at 200 GeV show a suppression of Upsilon(1S+2S+3S) production relative to expectations from the Upsilon yield in p+p collisions scaled by the number of binary nucleon-nucleon collisions (Ncoll), with an indication that the Upsilon(1S) state is also suppressed. The present measurement extends the number of participant nucleons in the collision (Npart) by 20% compared to Au+Au collisions, and allows us to study a system with higher energy density. We observe a suppression in both the Upsilon(1S+2S+3S) and Upsilon(1S) yields in central U+U data, which consolidates and extends the previously observed suppression trend in Au+Au collisions.

preprint2016arXivOpen access

STAR Collaboration L. Adamczyk J. K. Adkins G. Agakishiev M. M. Aggarwal Z. Ahammed I. Alekseev D. M. Anderson R. Aoyama A. Aparin D. Arkhipkin E. C. Aschenauer M. U. Ashraf A. Attri G. S. Averichev X. Bai V. Bairathi R. Bellwied A. Bhasin A. K. Bhati P. Bhattarai J. Bielcik J. Bielcikova L. C. Bland I. G. Bordyuzhin J. Bouchet J. D. Brandenburg A. V. Brandin I. Bunzarov J. Butterworth H. Caines M. Calderón de la Barca Sánchez J. M. Campbell D. Cebra I. Chakaberia P. Chaloupka Z. Chang A. Chatterjee S. Chattopadhyay J. H. Chen X. Chen J. Cheng M. Cherney W. Christie G. Contin H. J. Crawford S. Das L. C. De Silva R. R. Debbe T. G. Dedovich J. Deng A. A. Derevschikov L. Didenko C. Dilks X. Dong J. L. Drachenberg J. E. Draper C. M. Du L. E. Dunkelberger J. C. Dunlop L. G. Efimov J. Engelage G. Eppley R. Esha S. Esumi O. Evdokimov O. Eyser R. Fatemi S. Fazio P. Federic J. Fedorisin Z. Feng P. Filip E. Finch Y. Fisyak C. E. Flores L. Fulek C. A. Gagliardi D. Garand F. Geurts A. Gibson M. Girard L. Greiner D. Grosnick D. S. Gunarathne Y. Guo A. Gupta S. Gupta W. Guryn A. I. Hamad A. Hamed R. Haque J. W. Harris L. He S. Heppelmann A. Hirsch G. W. Hoffmann S. Horvat H. Z. Huang B. Huang T. Huang X. Huang P. Huck T. J. Humanic G. Igo W. W. Jacobs A. Jentsch J. Jia K. Jiang S. Jowzaee E. G. Judd S. Kabana D. Kalinkin K. Kang K. Kauder H. W. Ke D. Keane A. Kechechyan Z. Khan D. P. Kikoła I. Kisel A. Kisiel L. Kochenda D. D. Koetke L. K. Kosarzewski A. F. Kraishan P. Kravtsov K. Krueger L. Kumar M. A. C. Lamont J. M. Landgraf K. D. Landry J. Lauret A. Lebedev R. Lednicky J. H. Lee Y. Li C. Li X. Li W. Li T. Lin M. A. Lisa F. Liu Y. Liu T. Ljubicic W. J. Llope M. Lomnitz R. S. Longacre X. Luo S. Luo G. L. Ma R. Ma L. Ma Y. G. Ma N. Magdy R. Majka A. Manion S. Margetis C. Markert H. S. Matis D. McDonald S. McKinzie K. Meehan J. C. Mei Z. W. Miller N. G. Minaev S. Mioduszewski D. Mishra B. Mohanty M. M. Mondal D. A. Morozov M. K. Mustafa B. K. Nandi Md. Nasim T. K. Nayak G. Nigmatkulov T. Niida L. V. Nogach T. Nonaka J. Novak S. B. Nurushev G. Odyniec A. Ogawa K. Oh V. A. Okorokov D. Olvitt Jr.B. S. Page R. Pak Y. X. Pan Y. Pandit Y. Panebratsev B. Pawlik H. Pei C. Perkins P. Pile J. Pluta K. Poniatowska J. Porter M. Posik A. M. Poskanzer N. K. Pruthi M. Przybycien J. Putschke H. Qiu A. Quintero S. Ramachandran R. L. Ray R. Reed M. J. Rehbein H. G. Ritter J. B. Roberts O. V. Rogachevskiy J. L. Romero J. D. Roth L. Ruan J. Rusnak O. Rusnakova N. R. Sahoo P. K. Sahu I. Sakrejda S. Salur J. Sandweiss A. Sarkar J. Schambach R. P. Scharenberg A. M. Schmah W. B. Schmidke N. Schmitz J. Seger P. Seyboth N. Shah E. Shahaliev P. V. Shanmuganathan M. Shao M. K. Sharma A. Sharma B. Sharma W. Q. Shen Z. Shi S. S. Shi Q. Y. Shou E. P. Sichtermann R. Sikora M. Simko S. Singha M. J. Skoby D. Smirnov N. Smirnov W. Solyst L. Song P. Sorensen H. M. Spinka B. Srivastava T. D. S. Stanislaus M. Stepanov R. Stock M. Strikhanov B. Stringfellow T. Sugiura M. Sumbera B. Summa Y. Sun Z. Sun X. M. Sun B. Surrow D. N. Svirida Z. Tang A. H. Tang T. Tarnowsky A. Tawfik J. Thäder J. H. Thomas A. R. Timmins D. Tlusty T. Todoroki M. Tokarev S. Trentalange R. E. Tribble P. Tribedy S. K. Tripathy O. D. Tsai T. Ullrich D. G. Underwood I. Upsal G. Van Buren G. van Nieuwenhuizen R. Varma A. N. Vasiliev R. Vertesi F. Videbæk S. Vokal S. A. Voloshin A. Vossen G. Wang J. S. Wang F. Wang Y. Wang J. C. Webb G. Webb L. Wen G. D. Westfall H. Wieman S. W. Wissink R. Witt Y. Wu Z. G. Xiao G. Xie W. Xie K. Xin Z. Xu H. Xu N. Xu J. Xu Y. F. Xu Q. H. Xu Y. Yang S. Yang Q. Yang C. Yang Z. Ye L. Yi K. Yip I. -K. Yoo N. Yu H. Zbroszczyk W. Zha J. Zhang Z. Zhang S. Zhang X. P. Zhang J. B. Zhang Y. Zhang J. Zhao C. Zhong L. Zhou X. Zhu Y. Zoulkarneeva M. Zyzak

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