Production of π0 and η mesons in Cu+Au collisions at sNN=200GeV

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

doi:10.1103/physrevc.98.054903

Abstract

Production of π0 and η mesons has been measured at midrapidity in Cu+Au collisions at sNN=200GeV. Measurements were performed in π0(η)→γγ decay channel in the 1(2)−20GeV/c transverse momentum range. A strong suppression is observed for π0 and η meson production at high transverse momentum in central Cu+Au collisions relative to the p+p results scaled by the number of nucleon-nucleon collisions. In central collisions the suppression is similar to Au+Au with comparable nuclear overlap. The η/π0 ratio measured as a function of transverse momentum is consistent with mT-scaling parametrization down to pT=2GeV/c, its asymptotic value is constant and consistent with Au+Au and p+p and does not show any significant dependence on collision centrality. Similar results were obtained in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions as well as in e+e− collisions in a range of collision energies sNN=3−1800 GeV. This suggests that the quark-gluon-plasma medium produced in Cu+Cu collisions either does not affect the jet fragmentation into light mesons or it affects the π0 and η the same way.Received 4 June 2018DOI:https://doi.org/10.1103/PhysRevC.98.054903Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasRelativistic heavy-ion collisionsPhysical SystemsLight mesonsPionsTechniquesHadron collidersNuclear Physics

Highlights

Experiments at the Relativistic Heavy Ion Collider (RHIC) [1,2,3,4] and later at the Large Hadron Collider (LHC) [5,6,7,8] established the formation of quark-gluon plasma (QGP) in relativistic collisions of heavy ions (A+A)
In central collisions the suppression is similar to Au + Au with comparable nuclear overlap
The η/π0 ratio measured as a function of transverse momentum is consistent with mT -scaling parametrization down to pT = 2 GeV/c, its asymptotic value is constant and consistent with Au + Au and p + p and does not show any significant dependence on collision centrality

Summary

Published by the American Physical Society

Similar results nucleus collisions as well as in e+e− collisions were in a obtained range of in hadron-hadron, collision energies h√adsNroNn-=nu3c−le1u8s0, 0anGd enVu.clTeuhsissuggests that the quark-gluon-plasma medium produced in Cu+Cu collisions either does not affect the jet fragmentation into light mesons or it affects the π 0 and η the same way

INTRODUCTION

Centrality interval

Raw yield extraction

Stat Type A Type B Type C

RESULTS AND DISCUSSION

SUMMARY