Production of π0 and η mesons in U+U collisions at sNN=192 GeV

U Acharya,A Bazilevsky,D Ivanishchev,J L Nagle,A Hodges,D Lynch,R Petti,C Gal,N Ramasubramanian,K Sedgwick,K Tanida,S Zhou,D Kincses,B Mulilo,M Gonin,S Zharko,N Novitzky,W A Zajc,M Virius,M Potekhin,I Garishvili,Y I Makdisi,M Leitgab,K Kurita,A Taketani,J Murata,M Larionova,C Pinkenburg,M Chiu,R Seto,I J Choi,T Engelmore,M Skolnik,E T Atomssa,D Roach,E Kistenev,J C Hill,M I Nagy,B Fadem,T C Awes,Y Goto,N Crossette,Iu Mitrankov,T K Hemmick,M Slunečka,Y Imazu,Y Sekiguchi,H W Van Hecke,P K Khandai,S Nelson,A Taranenko,M L Brooks,J D Osborn,D Richford,E Tennant,S Mizuno,T Hoshino,A Denisov,R Lacey,J G Lajoie,M Mccumber,S F Pate,A Mwai,J Runchey,E Stenlund,D Kotchetkov,K A Drees,D Isenhower,K S Lee,J S Haggerty,S D Rolnick,A Pun,D Kawall,M Sarsour,M Nihashi,J Bryslawskyj,P V Radzevich,R P Pisani,S Sawada,A Enokizono,K Nakano,J Seele,K Imai,R S Towell,Y Tanaka,B Komkov,V Papavassiliou,R Granier De Cassagnac,E J Desmond,K Boyle,T Majoros,E Richardson,S Butsyk,V Canoa Roman,C P Singh,G D N Perera,S Solano,I E Yushmanov,A Drees,B M Johnson,Y Ikeda,B Sahlmueller,D M Lee,S Yokkaichi,P Kline,R Belmont,R Seidl,I V Sourikova,M Grosse Perdekamp,D Jouan,K Dehmelt,Y Berdnikov,K M Kijima,S Tarafdar,Y Ueda,D S Jumper,A Berdnikov,P W Stankus,S Nagamiya,B Blankenship,M J Leitch,E Vznuzdaev,I Tserruya,B Azmoun,T Niida,Y Nakamiya,W E Sondheim,I Younus,T Moon,T Hester,M Tomášek,A Isinhue,I Ravinovich,S H Lee,R Pak,A Manion,Y Fukao,C Mckinney,R A Soltz,A Timilsina,N Apadula,O Drapier,D P Morrison,D Kleinjan,S Kanda,A Veicht,W Peng,K Deblasio,N Riveli,J Hanks,A Garishvili,M Stepanov,S Bathe,M Rosati,A Meles,D Firak,D Kotov,M Patel,Y Akiba,D E Fields,K Shoji,A Durum,L Zou,T Todoroki,A V Kazantsev,J Klatsky,K O Eyser,S P Stoll,V Bumazhnov,L Patel,T Hachiya,B Meredith,K Gainey,A Lebedev,V Babintsev,C A Ogilvie,T Ichihara,A Franz,M Beaumier,A D Frawley,A Deshpande,A Iordanova,G David,I Shein,C E Perezlara,T Koblesky,A Ster,M Wysocki,Y Watanabe,T Murakami,K Okada,K N Barish,C Baumann,S Wolin,I Nakagawa,J Koster,M J Tannenbaum,N N Ajitanand,E Vazquez-Zambrano,J E Frantz,P L Mcgaughey,T V Moukhanova,D K Mishra,W J Metzger,M Jezghani,B Xia,M Finger,J H Kang,A Sukhanov,N Cronin,B Bannier,S Esumi,V Baublis,M Mendoza,L Bichon,Y Riabov,A Yanovich,D Larionova,N Grau,R S Hollis,V Cianciolo,B Kurgyis,H Guragain,S Hasegawa,P Garg,J Sun,A C Mignerey,M Kurosawa,J A Key,S Mohapatra,A Takahara,T Sugitate,A Sen,J T Mitchell,F Giordano,S Park,I H Park,D Yu Peressounko,H Buesching,S K Park,V Khachatryan,Y S Lai,B Hong,Y.-J Kim,A M Sickles ,S Sörensen ,Susumu Sato ,Daisuke Watanabe ,Kenneth Francis Read ,B Cole ,C Y ,C A Aidala ,S Greene ,R S Hayano ,S Fokin ,J H ,Wei Fang ,F Křížek ,T A Shibata ,A Nyanin ,Yoshio Yamaguchi ,Deirdre Black ,V K Singh ,B Ujvári ,Xiaozhi Bai ,Z Y You ,Stephen Baumgart ,B Jacak ,A Öskarsson ,D Blau ,X M Sun ,Q Xu ,Kazuo Aoki ,D S Fitzgerald ,Mei Bai ,T Csörgõ ,C Maguire ,C Woody ,Timothy Thomas Rinn ,Sanghoon Lim ,E O’brien ,V.s Borisov ,K Nakamura ,Laurent D’orazio ,V Manko ,Jeongsu Bok ,K Smith ,M Daugherity ,Marc L Moskowitz ,Sihyun Jeon ,J C Peng ,J Choi ,S Lökòs ,J Kapustinsky,T Novák,M X Liu,S Choi,T Sakaguchi,J Velkovska,H Asano,J Alexander,H Sako,J Rak,M Inaba,M Kofarago,M S Ryu,A K Mohanty,A Shaver,Y Kwon,X R Wang,Y Gu,J Perry,K Shigaki,S I Morrow,B K Singh,D Mcglinchey,V Vrba,D Silvermyr,M Vargyas,B H Kang,L Ding,A Datta,J Jia,A Milov,V Pantuev,H Oide,A Zelenski,X He,K Watanabe,H Hamagaki,R Esha,M Makek,V Samsonov,Z Sun,A Khatiwada,C Nattrass,M Connors,K B Lee,K Ozawa,T Fusayasu,S Whitaker,N A Lewis,Y K Kim,K Homma,E.-J Kim,D Reynolds,M Shimomura,D Sharma,C Kim,R Nouicer,P Christiansen,M L Purschke,K Hashimoto,X Jiang,T Nakamura,Z Ji,C.-H Chen,J Kamin,T Gunji,R Vértesi,T Mibe,T Nagae,D V Perepelitsa,A Glenn,J Huang,R Akimoto,V Riabov,W Fan,P Steinberg,S Campbell,K S Joo,F Fleuret,X Gong,G H Lee,C L Silva,D J Kim,P Shukla,E Mannel,S Huang,J Lee,Y Miake,N Saito,Y Zhai,T Chujo,X Li,B Lewis,S Miyasaka,J M Durham,H Torii,I Yoon,S Y Han,M R Stone,A Khanzadeev,P K Netrakanti,H Qu,M Csanád,Y Wu,J S Kang,C P Wong,K I Hahn,P Sett

doi:10.1103/physrevc.102.064905

Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider measured $\pi^0$ and $\eta$ mesons at midrapidity in U$+$U collisions at $\sqrt{s_{_{NN}}}=192$ GeV in a wide transverse momentum range. Measurements were performed in the $\pi^0(\eta)\rightarrow\gamma\gamma$ decay modes. A strong suppression of $\pi^0$ and $\eta$ meson production at high transverse momentum was observed in central U$+$U collisions relative to binary scaled $p$$+$$p$ results. Yields of $\pi^0$ and $\eta$ mesons measured in U$+$U collisions show similar suppression pattern to the ones measured in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV for similar numbers of participant nucleons. The $\eta$/$\pi^0$ ratios do not show dependence on centrality or transverse momentum, and are consistent with previously measured values in hadron-hadron, hadron-nucleus, nucleus-nucleus, and $e^+e^-$ collisions.

Highlights

Extensive studies of heavy-ion collisions (A + A) at the Relativistic Heavy Ion Collider (RHIC) resulted in the discovery of the quark-gluon plasma (QGP) [1,2,3,4]
In this paper we present results on π 0 and η meson power-law function f (pT)
At pT > 5 GeV/c the meson spectra are fit to the power-law function f =

Summary

INTRODUCTION

Extensive studies of heavy-ion collisions (A + A) at the Relativistic Heavy Ion Collider (RHIC) resulted in the discovery of the quark-gluon plasma (QGP) [1,2,3,4]. One of the main efforts of RHIC experiments was directed towards detailed studies of the properties of the new state of nuclear matter, in part by making more differential and more precise measurements, and by varying the collision energy and system size. The culmination of the latter was colliding U + U, the largest ever nucleus-nucleus collision system studied so far at RHIC or the Large Hadron Collider. When comparing physics observables in U + U with Cu + Cu, Au + Au, or Pb + Pb collisions, one has to be aware that, in any finite collision centrality bin, the fluctuations of the overlap volume and energy density are larger in U + U than in the case of spherical nuclei

DATA ANALYSIS

RESULTS AND DISCUSSION

SUMMARY