Measurement of the cross section and longitudinal double-spin asymmetry for dijet production in polarized pp collisions at s =200 GeV

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

PHYSICAL REVIEW D（2017）

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摘要

We report the first measurement of the longitudinal double-spin asymmetry A(LL) for midrapidity dijet production in polarized pp collisions at a center-of-mass energy of root s = 200 GeV. The dijet cross section was measured and is shown to be consistent with next-to-leading order (NLO) perturbative QCD predictions. A(LL) results are presented for two distinct topologies, defined by the jet pseudorapidities, and are compared to predictions from several recent NLO global analyses. The measured asymmetries, the first such correlation measurements, support those analyses that find positive gluon polarization at the level of roughly 0.2 over the region of Bjorken-x > 0.05.

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关键词

Perturbative QCD,Gluon,Quark–gluon plasma,Asymmetry,Proton,Spin-½,Particle physics,Nuclear physics,Polarization (waves),Physics

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