Underlying event measurements in $p$+$p$ collisions at $\sqrt{s}= 200 $ GeV at RHIC

Jaroslav Adam,K. Krueger,D Kalinkin,V. A. Okorokov,W.Q. Shen,Y. Hu,Hans Georg Ritter,G. S. Averichev,Y. J. Sun,Xionghong He,Y. Ji,Lijuan Ruan,Maria Sergeeva,Yang Zhang,D. A. Morozov,M.N. Strikhanov,Te-Chuan Huang,P. Seyboth,Matthew Kelsey,Miroslav Simko,Sevil Salur,Y. Xu,Shu He,Zhen Wang,S. Heppelmann,J. Lauret,Yuanjing Li,Niseem Magdy Abdelwahab Abdelrahman,David Stewart,Zhanwen Zhu,Christina Markert,Derek Anderson,O. V. Rogachevskiy,C. Perkins,Daniel Nemes,Igor Bordyuzhin,Guo-Liang Ma,Huan Huang,Y. V. Khyzhniak,S. W. Wissink,Wei Li,Nu Xu,J. L. Drachenberg,N. G. Minaev,Jie Zhao,David Grosnick,A. Lebedev,L. Didenko,Sergey Voloshin,M. Tokarev,Liwen Wen,K. Yip,Song Zhang,Lokesh Kumar,Haojie Xu,Olga Evdokimov,Jinhui Chen,Hank Crawford,B. K. Chan,Arghya Chatterjee,David Kapukchyan,Bernd Surrow,Xin Dong,Florian Seck,Susumu Sato,Hanna Paulina Zbroszczyk,Fuwang Shen,W. He,Nicholas Elsey,Bill Christie,Z. Yang,A. Ogawa,L. V. Nogach,Zhangbu Xu,Łukasz Fulek,Jaroslav Bielcik,Joel Anthony Mazer,A.N. Vasiliev,Z. Chen,Xiaoping Zhang,C. Zhong,Ayman Hamad,S. K. Tripathy,Jeong-hun Lee,Li Yi,B. Pawlik,Todd Kinghorn,E. Hoffman,S. Trentalange,J. H. Thomas,Leszek Kosarzewski,Feng Liu,Anjali Attri,G. D. Westfall,Guannan Xie,M. Posik,Zhe-Jia Zhang,Xin Li,Y. Panebratsev,Kishora Nayak,J. Cheng,Adam Gibson,R. E. Tribble,Xiaofeng Luo,K. Kang,Nedialka Chankova-Bunzarova,Y Hong,Jan Marian Pluta,Y. Fisyak,R. Esha,Benjamin Schweid,J. C. Webb,Spiros Margetis,Mariusz Przybycien,A. Taranenko,Z. Moravcova,X. Ju,Takafumi Niida,C. Yang,Lawrence Pinsky,Yanfang Liu,Yongjie Sun,H. Qiu,Rene Bellwied,Peng Liu,B. Kimelman,Xiaolong Chen,Shinichi Esumi,Zhengqiao Zhang,Subhash Singha,Leszek Adamczyk,Arabinda Behera,R Licenik,Zebo Tang,Isaac Mooney,Marton Imre Nagy,Z. Ye,Joseph Kwasizur,T. Tarnowsky,T. G. Dedovich,Daniel Kikola,X. Huang,Leslie Bland,Yaping Wang,H. W. Ke,M Chevalier,Iouri Vassiliev,Samuel Heppelmann,Branden Summa,Peter Filip,Michael Annan Lisa,Richard Daniel Majka,Jay Roberts,Irakli Chakaberia,Neha Shah,B. Schmidke,Madan Mohan Aggarwal,S. Yang,Hal Spinka,Z. J. Xu,Yi-Fei Xu,Isaac Upsal,D. Pawlowska,S. L. Huang,R. S. Longacre,Latiful Kabir,Frank Jm Geurts,W. Guryn,Brijesh Kumar Srivastava,Gang Wang,G. Eppley,Flemming Videbaek,A. Pandav,Rongrong Ma,Sooraj Krishnan Radhakrishnan,Kenneth Barish,A. Aparin,D. Isenhower,Z. Tu,Vipul Bairathi,S. Mioduszewski,M. Kocan,R. Pak,Brian Page,A. Kiselev,Toshihiro Nonaka,Mate Csanad,Hua Pei,Shusu Shi,Anju Bhasin,J. Sandweiss,M. Cherney,D.N. Svirida,B. Mohanty,Y. Wu,D. Neff,Wangmei Zha,Zubayer Ahammed,Y H Leung,Gene Van Buren,Nalinda Kulathunga Mudiyanselage,Chensheng Zhou,T Edmonds,Long Ma,Yu Zhang,Carl A. Gagliardi,John D. Nelson,P. C. Weidenkaff,Paweł Szymański,M Stefaniak,N. K. Pruthi,Kevin Adkins,Y Feng,Anthony Robert Timmins,B C. Stringfellow,S. H. Oh,S. Horvat,Jiansong Wang,L. Kochenda,G. Agakishiev,Alexandre Alarcon Do Passo Suaide,D. Cebra,E. P. Sichtermann,William Solyst,Rafał Sikora,Yu-Gang Ma,K. Kauder,J. M. Butterworth,E. Shahaliev,Manuel Calderon De La Barca Sanchez,E. G. Judd,C.J. Feng,X. Liu,Dave Underwood,Qiye Shou,R. Seto,R. L. Pintér,A. Kechechyan,Janet Elizabeth Seger,E. C. Aschenauer,J. L. Romero,Norbert Herrmann,David Tlustý,J. Engelage,Feng-Han Chang,Michael Daugherity,Jan Vanĕk,Nikolai Smirnov,J. Fedorisin,J. M. Landgraf,J. Putschke,Maowu Nie,J. D. Nam,Nasim,Cheng Li,William Llope,Shirvel Stanislaus,HuanZhao Liu,D. Kincses,Kun Jiang,Alexander Jentsch,Maksym Zyzak,Qian Yang,X. M. Sun,Qinghua Xu,E. Finch,Declan Keane,K. Gopal,Siwei Luo,S Ramachandran,S. Lan,S. Kabana,G. Odyniec,William Jacobs,Richard Lednicky,D Zhang,N. S. Lukow,Annika Ewigleben,A. Hamed,S. Vokal,Fuqiang Wang,P. Chaloupka,Fareha Atetalla,James Brandenburg,Wei Xie,H. S. Matis,Raghav Kunnawalkam Elayavalli,H.H. Wieman,Jack Harris,A. V. Brandin,Yi Wang,H. Sako,I. Alekseev,T. J. Humanic,T. Liu,Yi Yang,Oleg Eyser,P. Kravtsov,R. Fatemi,D. Chen,Paul Sorensen,Catherine Tomkiel,T. Galatyuk,Helen Louise Caines,Jeff Porter,Debasish Mallick,Pengfei Wang,Sedigheh Jowzaee,Jagbir Singh,O. D. Tsai,Lanny Ray,Zhen Liu,S. Fazio,Pavol Federic,Zhigang Xiao,S. Kagamaster,Prithwish Tribedy,G.J. Igo,Xianglei Zhu,Chitrasen Jena,N R Sahoo,Ivan Kisel,Joseph Adams,A. A. Derevschikov,Chong Kim,T. Ullrich,Roy A. Lacey,Z. Chang,Adam Ryszard Kisiel,S. Choudhury,M Zurek,Ming Shao,Grigory Nigmatkulov,Shenghui Zhang,Ingo Deppner,Ting-lin,Lukas Kramarik,Yue Liang,Audrey Francisco,Jana Bielcikova,Peifeng Liu,Z. Ye,Prashanth Shanmuganathan,Muhammad Usman Ashraf,Lukáš Holub,T. Ljubicic,R. Witt,J. Rusnak,Y. Lin,Aihong Tang,Norbert Schmitz,Peng Huo,Michal Šumbera,James Dunlop,Amilkar Quintero,Jiangyong Jia,Rosi Jan Reed

Underlying event measurements in $p$+$p$ collisions at $\sqrt{s}= 200 $ GeV at RHIC

2020

Author(s): Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Anderson, DM; Aparin, A; Aschenauer, EC; Ashraf, MU; Atetalla, FG; Attri, A; Averichev, GS; Bairathi, V; Barish, K; Behera, A; Bellwied, R; Bhasin, A; Bielcik, J; Bielcikova, J; Bland, LC; Bordyuzhin, IG; Brandenburg, JD; Brandin, AV; Butterworth, J; Caines, H; Calderon De La Barca Sanchez, M; Cebra, D; Chakaberia, I; Chaloupka, P; Chan, BK; Chang, FH; Chang, Z; Chankova-Bunzarova, N; Chatterjee, A; Chen, D; Chen, JH; Chen, X; Chen, Z; Cheng, J; Cherney, M; Chevalier, M; Choudhury, S; Christie, W; Crawford, HJ; Csanad, M; Daugherity, M; Dedovich, TG; Deppner, IM; Derevschikov, AA; Didenko, L; Dong, X; Drachenberg, JL; Dunlop, JC; Edmonds, T; Elsey, N; Engelage, J; Eppley, G; Esha, R; Esumi, S; Evdokimov, O; Ewigleben, A; Eyser, O; Fatemi, R; Fazio, S; Federic, P; Fedorisin, J; Feng, CJ; Feng, Y; Filip, P; Finch, E; Fisyak, Y; Francisco, A; Fulek, L; Gagliardi, CA; Galatyuk, T; Geurts, F; Gibson, A; Gopal, K; Grosnick, D; Guryn, W; Hamad, AI; Hamed, A | Abstract: ©, between 0.5 and 0.7 GeV/c for particles with pT g 0.2 GeV/c at mid-pseudorapidity (|η| l 1) and jet pT g 15 GeV/c. Both average particle density and © depend weakly on the leading jet pT. Closer inspection of the Transverse region hints that contributions to the underlying event from initial- A nd final-state radiation are significantly smaller in these collisions than at the higher energies, up to 13 TeV, recorded at the LHC. Underlying event measurements associated with a high-pT jet will contribute to our understanding of QCD processes at hard and soft scales at RHIC energies, as well as provide constraints to modeling of underlying event dynamics. © 2020 American Physical Society. Particle production sensitive to nonfactorizable and nonperturbative processes that contribute to the underlying event associated with a high transverse momentum (pT) jet in proton+proton collisions at s=200 GeV is studied with the STAR detector. Each event is divided into three regions based on the azimuthal angle with respect to the highest-pT jet direction: In the leading jet direction ("Toward"), opposite to the leading jet ("Away"), and perpendicular to the leading jet ("Transverse"). In the Transverse region, the average charged particle density is found to be between 0.4 and 0.6 and the mean transverse momentum,

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