Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at s=200  GeV

M S Abdallah ,P Seyboth,V Prozorova,W Xie,X Chu,R Fatemi,K Gopal,X Li,T Tarnowsky,J Lauret,K Kang,R Majka,S Chattopadhyay,L Di Carlo,B Stringfellow,N Schmitz,N Herrmann,X Gou,J Zhao,O Eyser,M Stefaniak,A Mukherjee,A Attri,N Chankova-Bunzarova,T Galatyuk,J Seger,L Wen,B Mohanty,B Pawlik,A Ogawa,R Witt,S Trentalange,J Butterworth,J Engelage,D Zhang,Z Tang,C Kim,P Parfenov,A Ewigleben,A Pandav,X Sun,C Jena,A Jentsch,W Guryn,Y Wang,D Mallick,X Chen,R Ma,S Heppelmann,S Salur,M Nie,J Adam,S Lan,M Chevalier,S Margetis,I Vassiliev,Y Söhngen,I Kisel,A Kechechyan,N Xu,C Markert,Z Chen,Z Chang,L Holub,H Qiu,W Baker,C Zhang,Z Zhang,X Dong,R Lacey,D Kincses,F Videbæk,Y Feng,A Gupta,S Zhang,G Van Buren,D Isenhower,X Ju,A Kiselev,Q Yang,T Truhlar,Y Han,G Odyniec,J Putschke,M Simko,P Filip,X Liang,Y Panebratsev,L Pinsky,Y Ji,P Chaloupka,W Solyst,M Shao,K Nayak,K Kauder,B Kimelman,E Shahaliev,A Quintero,Y Yu,B Summa,Z Liu,H Sako,S Kabana,R Sikora,J Cheng,A Behera,W Christie,M Calderón De La Barca Sánchez,D Neff,H Caines,B Xi,P Wang,P Federic,Md Nasim,T Huang,T Liu,I Bunzarov,W Li,S Yang,X Zhu,S Harabasz,H Liu,F Wang,Y Lin,T Todoroki,X Luo,G Xie,D Grosnick,N Elsey,L Kumar,T Shao,J Chen,P Bhagat,R Bellwied,R Nishitani,C Racz,V Bairathi,D Chen,Z Xu,J Sandweiss,Y Fisyak,H Harrison,S Kagamaster,N Magdy,P Liu,M Csanád,F-H Chang,Y Wu,M Daugherity,M Tokarev,C Zhou,E Loyd,S Mioduszewski,Y Huang,B Srivastava,Y Zhang,D Kalinkin,R Pak,G Ponimatkin,Y Liu,G Eppley,Z Tu,S Singha,P Tribedy,G Nigmatkulov,A Taranenko,I Mooney,I Upsal,F Seck,I Aggarwal,Y Sun,L Kochenda,Z Ahammed,X Huang,L Didenko,W Zha,H Pei,L Yi,A Chatterjee,Y Hu,S He,Y Xu,W He,A Lebedev,Y Li,Y Liang,H Zbroszczyk,M Strikhanov,A Gibson,S Esumi,A Hamed,D Kapukchyan,C Perkins,J Pluta,T Ullrich,A Francisco,M Robotkova,I Alekseev,R Licenik,K Jiang,C Li,G Wang,D Cebra,M Zyzak,J Porter,V Verkest,O Evdokimov,R Reed,H Xu,N Shah,K Yip,H Wieman,B Surrow,Z Ye,E Finch,S Fazio,A Aparin,J Jia,N Raha,M Sergeeva,F Liu,N Smirnov,Z Wang,D Keane,T Niida,T Lin,P Sorensen,D Tlusty,Y Shi,Y Yang,M Posik,R Seto,T Nonaka,S Choudhury,L Adamczyk,C Yang,X Liu,A Dhamija,I Chakaberia,A Bhasin,G Agakishiev,L Ruan,J C Webb ,R S Longacre ,R L Ray ,Y H Leung ,B R Schweid ,Y V Khyzhniak ,Nirmal Ghimire ,J L Romero ,M Przybycień ,T G Dedovich ,П Кравцов ,F J M Geurts ,Raghav Kunnawalkam Elayavalli ,J Mazer ,M M Mondal ,G S Averichev ,J C Dunlop ,W W Jacobs ,W B Schmidke ,Yang He ,S A Voloshin ,G D Westfall ,M Żurek ,A A Derevschikov ,C.d Fu ,D G Underwood ,F M Fawzi ,Eric A Hoffman ,T D S Stanislaus ,A S Nunes ,J M Nelson ,Vitaly Okorokov ,Lianliang Ma ,N K Pruthi ,E C Aschenauer ,P Szymański ,D Y Shen ,D Pawłowska ,J S Wang ,S K Radhakrishnan ,J Bielčíková ,Xiao Zhang ,Susumu Sato ,J H Lee ,Ł Fulek ,M L Kabir ,S B Oh ,J M Landgraf ,M D Harasty ,H J Crawford ,Ashok Kumar Pandey ,C Feng ,M M Aggarwal ,D B Nemes ,J Ball ,A I Hamad ,J D Nam ,H.g Ritter ,J K Adkins ,J B Singh ,R E Tribble ,R Lednický ,David J Stewart ,S S Shi ,C A Gagliardi ,J R Adams ,T Ljubičić ,A V Brandin ,X Cai ,K N Barish ,J H Wu ,A Vasiliev ,H W Ke ,A I Sheikh ,D P Kikoła ,J D Brandenburg ,B S Page ,L Kramárik ,J H Kwasizur ,J H Chen ,C A Tomkiel ,J W Harris ,Q Shou ,B R Pokhrel ,Z H Zhu ,D N Svirida ,E G Judd ,M J Skoby ,R L Pintér ,O V Rogachevskiy ,J Rusňák ,M Šumbera ,F G Atetalla ,S Huang ,O D Tsai ,L K Kosarzewski ,B A Trzeciak ,T J Humanic ,L V Nogach ,J Fedorišin ,J Bielčík ,X He ,Z W Sweger ,A H Tang ,H M Spinka ,N G Minaev ,S Vokál ,B K Chan ,A G Knospe ,E P Sichtermann ,J Vaněk ,Muhammad Usman Ashraf ,Qingyang Xu ,S K Tripathy ,W J Llope ,N Sahoo ,D M Anderson ,M I Nagy ,J H Thomas ,A A P Suaide ,A R Timmins ,P C Weidenkaff ,I G Bordyuzhin ,Santosh Kumar ,P V Shanmuganathan ,M A Lisa ,J L Drachenberg ,I M Deppner ,Д А Морозов ,S W Wissink ,X P Zhang ,H Z Huang ,H S Matis ,N S Lukow ,Z J Zhang ,Y G

doi:10.1103/physrevd.103.l091103

Abstract

We report high-precision measurements of the longitudinal double-spin asymmetry, ALL, for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of s=200 GeV. The new inclusive jet data are sensitive to the gluon helicity distribution, Δg(x,Q2), for gluon momentum fractions in the range from x≃0.05 to x≃0.5, while the new dijet data provide further constraints on the x dependence of Δg(x,Q2). The results are in good agreement with previous measurements at s=200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Δg(x,Q2) is positive for x>0.05.Received 9 March 2021Accepted 28 April 2021DOI:https://doi.org/10.1103/PhysRevD.103.L091103Published 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 AreasHadron-hadron interactionsPerturbative QCDQuark & gluon jetsPhysical SystemsGluonsProtonsPropertiesPolarizationSpinTechniquesElectromagnetic calorimetersHadron collidersTime-projection chambersNuclear PhysicsParticles & Fields

Highlights

Longitudinal double-spin asymmetry for incluspivffieffi jet and dijet production in polarized proton collisions at s = 200 GeV
We report high-precision measurements of the longitudinal double-spin asymmetry, ALLp, fffioffi r midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of s 1⁄4 200 GeV
The new inclusive jet data are sensitive to the gluon helicity distribution, Δgðx; Q2Þ, for gluon momentum fractions in the dependence of range from x Δgðx; Q2Þ

Summary

Published by the American Physical Society

We report high-precision measurements of the longitudinal double-spin asymmetry, ALLp, fffioffi r midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of s 1⁄4 200 GeV. Inclusive jet pT and dijet invariant mass, Minv, were corrected for underlying-event contributions using the offaxis technique of Ref. For dijets that contained a track with pT > 30 GeV=c, the reconstructed jet-pT values were required to agree to within 50% to ensure that the transverse momenta of the two jets were balanced. Simulated events were used to correct the reconstructed jet quantities for detector response and to estimate contributions to the systematic uncertainties. The uncertainty on the jet pT (dijet Minv) associated with the underlying-event subtraction was determined by comparing the mean correction, dpT ≈ 0.7 GeV=c (dMinv ≈ 1.3 GeV=c2), in data to the one from embedded simulation. 6.00 Æ 0.20 7.31 Æ 0.22 9.47 Æ 0.25 11.33 Æ 0.31 13.36 Æ 0.34 15.74 Æ 0.35 18.43 Æ 0.38 21.49 Æ 0.44 25.10 Æ 0.51 29.17 Æ 0.56 33.81 Æ 0.62

ALL Æ ðStatÞ Æ ðSysÞ

Findings

Jet x T