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

M. S. Abdallah⁵, J. Adam⁶, L. Adamczyk², J. R. Adams³⁹, J. K. Adkins³⁰, G. Agakishiev²⁸, I. Aggarwal⁴¹, M. M. Aggarwal⁴¹, Z. Ahammed⁶¹ et al. (STAR Collaboration)

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Kosarzewski¹⁴, L. Kramarik¹⁴, P. Kravtsov³⁵, L. Kumar⁴¹, S. Kumar²⁶, R. Kunnawalkam Elayavalli⁶⁴, J. H. Kwasizur²⁵, R. Lacey⁵², S. Lan¹¹, J. M. Landgraf⁶, J. Lauret⁶, A. Lebedev⁶, R. Lednicky²⁸, J. H. Lee⁶, Y. H. Leung³¹, C. Li⁴⁹, C. Li⁴⁸, W. Li⁴⁵, X. Li⁴⁸, Y. Li⁵⁷, X. Liang¹⁰, Y. Liang²⁹, R. Licenik³⁸, T. Lin⁵⁵, Y. Lin¹¹, M. A. Lisa³⁹, F. Liu¹¹, H. Liu²⁵, P. Liu⁵², T. Liu⁶⁴, X. Liu³⁹, Y. Liu⁵⁵, Z. Liu⁴⁸, T. Ljubicic⁶, W. J. Llope⁶³, R. S. Longacre⁶, E. Loyd¹⁰, N. S. Lukow⁵⁴, X. Luo¹¹, L. Ma¹⁸, R. Ma⁶, Y. G. Ma¹⁸, N. Magdy¹², R. Majka^64,*, D. Mallick³⁶, S. Margetis²⁹, C. Markert⁵⁶, H. S. Matis³¹, J. A. Mazer⁴⁶, N. G. Minaev⁴³, S. Mioduszewski⁵⁵, B. Mohanty³⁶, M. M. Mondal⁵², I. Mooney⁶³, D. A. Morozov⁴³, A. Mukherjee¹⁶, M. Nagy¹⁶, J. D. Nam⁵⁴, Md. Nasim²², K. Nayak¹¹, D. Neff⁹, J. M. Nelson⁷, D. B. Nemes⁶⁴, M. Nie⁴⁹, G. Nigmatkulov³⁵, T. Niida⁵⁸, R. Nishitani⁵⁸, L. V. Nogach⁴³, T. Nonaka⁵⁸, A. S. Nunes⁶, G. Odyniec³¹, A. Ogawa⁶, S. Oh³¹, V. A. Okorokov³⁵, B. S. Page⁶, R. Pak⁶, A. Pandav³⁶, A. K. Pandey⁵⁸, Y. Panebratsev²⁸, P. Parfenov³⁵, B. Pawlik⁴⁰, D. Pawlowska⁶², H. Pei¹¹, C. Perkins⁷, L. Pinsky²⁰, R. L. Pintér¹⁶, J. Pluta⁶², B. R. Pokhrel⁵⁴, G. Ponimatkin³⁸, J. Porter³¹, M. Posik⁵⁴, V. Prozorova¹⁴, N. K. Pruthi⁴¹, M. Przybycien², J. Putschke⁶³, H. Qiu²⁶, A. Quintero⁵⁴, C. Racz¹⁰, S. K. Radhakrishnan²⁹, N. Raha⁶³, R. L. Ray⁵⁶, R. Reed³², H. G. Ritter³¹, M. Robotkova³⁸, O. V. Rogachevskiy²⁸, J. L. Romero⁸, L. Ruan⁶, J. Rusnak³⁸, N. R. Sahoo⁴⁹, H. Sako⁵⁸, S. Salur⁴⁶, J. Sandweiss^64,*, S. Sato⁵⁸, W. B. Schmidke⁶, N. Schmitz³³, B. R. Schweid⁵², F. Seck¹⁵, J. Seger¹³, M. Sergeeva⁹, R. Seto¹⁰, P. Seyboth³³, N. Shah²⁴, E. Shahaliev²⁸, P. V. Shanmuganathan⁶, M. Shao⁴⁸, T. Shao⁵⁰, A. I. Sheikh²⁹, D. Shen⁵⁰, S. S. Shi¹¹, Y. Shi⁴⁹, Q. Y. Shou¹⁸, E. P. Sichtermann³¹, R. Sikora², M. Simko³⁸, J. Singh⁴¹, S. Singha²⁶, M. J. Skoby⁴⁴, N. Smirnov⁶⁴, Y. Söhngen¹⁹, W. Solyst²⁵, P. Sorensen⁶, H. M. Spinka^4,*, B. Srivastava⁴⁴, T. D. S. Stanislaus⁶⁰, M. Stefaniak⁶², D. J. Stewart⁶⁴, M. Strikhanov³⁵, B. Stringfellow⁴⁴, A. A. P. Suaide⁴⁷, M. Sumbera³⁸, B. Summa⁴², X. M. Sun¹¹, X. Sun¹², Y. Sun⁴⁸, Y. Sun²¹, B. Surrow⁵⁴, D. N. Svirida³, Z. W. Sweger⁸, P. Szymanski⁶², A. H. Tang⁶, Z. Tang⁴⁸, A. Taranenko³⁵, T. Tarnowsky³⁴, J. H. Thomas³¹, A. R. Timmins²⁰, D. Tlusty¹³, T. Todoroki⁵⁸, M. Tokarev²⁸, C. A. Tomkiel³², S. Trentalange⁹, R. E. Tribble⁵⁵, P. Tribedy⁶, S. K. Tripathy¹⁶, T. Truhlar¹⁴, B. A. Trzeciak¹⁴, O. D. Tsai⁹, Z. Tu⁶, T. Ullrich⁶, D. G. Underwood⁴, I. Upsal^49,6, G. Van Buren⁶, J. Vanek³⁸, A. N. Vasiliev⁴³, I. Vassiliev¹⁷, V. Verkest⁶³, F. Videbæk⁶, S. Vokal²⁸, S. A. Voloshin⁶³, F. Wang⁴⁴, G. Wang⁹, J. S. Wang²¹, P. Wang⁴⁸, Y. Wang¹¹, Y. Wang⁵⁷, Z. Wang⁴⁹, J. C. Webb⁶, P. C. Weidenkaff¹⁹, L. Wen⁹, G. D. Westfall³⁴, H. Wieman³¹, S. W. Wissink²⁵, R. Witt⁵⁹, J. Wu²⁶, Y. Wu¹⁰, B. Xi⁵⁰, Z. G. Xiao⁵⁷, G. Xie³¹, W. Xie⁴⁴, H. Xu²¹, N. Xu³¹, Q. H. Xu⁴⁹, Y. Xu⁴⁹, Z. Xu⁶, Z. Xu⁹, C. Yang⁴⁹, Q. Yang⁴⁹, S. Yang⁴⁵, Y. Yang³⁷, Z. Ye⁴⁵, Z. Ye¹², L. Yi⁴⁹, K. Yip⁶, Y. Yu⁴⁹, H. Zbroszczyk⁶², W. Zha⁴⁸, C. Zhang⁵², D. Zhang¹¹, S. Zhang¹², S. Zhang¹⁸, X. P. Zhang⁵⁷, Y. Zhang²⁶, Y. Zhang⁴⁸, Y. Zhang¹¹, Z. J. Zhang³⁷, Z. Zhang⁶, Z. Zhang¹², J. Zhao⁴⁴, C. Zhou¹⁸, X. Zhu⁵⁷, Z. Zhu⁴⁹, M. Zurek ³¹, and M. Zyzak¹⁷ (STAR Collaboration)

¹Abilene Christian University, Abilene, Texas 79699
²AGH University of Science and Technology, FPACS, Cracow 30-059, Poland
³Alikhanov Institute for Theoretical and Experimental Physics NRC “Kurchatov Institute”, Moscow 117218, Russia
⁴Argonne National Laboratory, Argonne, Illinois 60439
⁵American University of Cairo, New Cairo 11835, New Cairo, Egypt
⁶Brookhaven National Laboratory, Upton, New York 11973
⁷University of California, Berkeley, California 94720
⁸University of California, Davis, California 95616
⁹University of California, Los Angeles, California 90095
¹⁰University of California, Riverside, California 92521
¹¹Central China Normal University, Wuhan, Hubei 430079
¹²University of Illinois at Chicago, Chicago, Illinois 60607
¹³Creighton University, Omaha, Nebraska 68178
¹⁴Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic
¹⁵Technische Universität Darmstadt, Darmstadt 64289, Germany
¹⁶ELTE Eötvös Loránd University, Budapest, Hungary H-1117
¹⁷Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany
¹⁸Fudan University, Shanghai, 200433
¹⁹University of Heidelberg, Heidelberg 69120, Germany
²⁰University of Houston, Houston, Texas 77204
²¹Huzhou University, Huzhou, Zhejiang 313000
²²Indian Institute of Science Education and Research (IISER), Berhampur 760010, India
²³Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati 517507, India
²⁴Indian Institute Technology, Patna, Bihar 801106, India
²⁵Indiana University, Bloomington, Indiana 47408
²⁶Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000
²⁷University of Jammu, Jammu 180001, India
²⁸Joint Institute for Nuclear Research, Dubna 141 980, Russia
²⁹Kent State University, Kent, Ohio 44242
³⁰University of Kentucky, Lexington, Kentucky 40506-0055
³¹Lawrence Berkeley National Laboratory, Berkeley, California 94720
³²Lehigh University, Bethlehem, Pennsylvania 18015
³³Max-Planck-Institut für Physik, Munich 80805, Germany
³⁴Michigan State University, East Lansing, Michigan 48824
³⁵National Research Nuclear University MEPhI, Moscow 115409, Russia
³⁶National Institute of Science Education and Research, HBNI, Jatni 752050, India
³⁷National Cheng Kung University, Tainan 70101
³⁸Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic
³⁹Ohio State University, Columbus, Ohio 43210
⁴⁰Institute of Nuclear Physics PAN, Cracow 31-342, Poland
⁴¹Panjab University, Chandigarh 160014, India
⁴²Pennsylvania State University, University Park, Pennsylvania 16802
⁴³NRC “Kurchatov Institute”, Institute of High Energy Physics, Protvino 142281, Russia
⁴⁴Purdue University, West Lafayette, Indiana 47907
⁴⁵Rice University, Houston, Texas 77251
⁴⁶Rutgers University, Piscataway, New Jersey 08854
⁴⁷Universidade de São Paulo, São Paulo, Brazil 05314-970
⁴⁸University of Science and Technology of China, Hefei, Anhui 230026
⁴⁹Shandong University, Qingdao, Shandong 266237
⁵⁰Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800
⁵¹Southern Connecticut State University, New Haven, Connecticut 06515
⁵²State University of New York, Stony Brook, New York 11794
⁵³Instituto de Alta Investigación, Universidad de Tarapacá, Arica 1000000, Chile
⁵⁴Temple University, Philadelphia, Pennsylvania 19122
⁵⁵Texas A&M University, College Station, Texas 77843
⁵⁶University of Texas, Austin, Texas 78712
⁵⁷Tsinghua University, Beijing 100084
⁵⁸University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
⁵⁹United States Naval Academy, Annapolis, Maryland 21402
⁶⁰Valparaiso University, Valparaiso, Indiana 46383
⁶¹Variable Energy Cyclotron Centre, Kolkata 700064, India
⁶²Warsaw University of Technology, Warsaw 00-661, Poland
⁶³Wayne State University, Detroit, Michigan 48201
⁶⁴Yale University, New Haven, Connecticut 06520

^*Deceased

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Phys. Rev. D 103, L091103 – Published 26 May, 2021

DOI: https://doi.org/10.1103/PhysRevD.103.L091103

Abstract

We report high-precision measurements of the longitudinal double-spin asymmetry, $A_{L L}$ , for midrapidity inclusive jet and dijet production in polarized $p p$ collisions at a center-of-mass energy of $\sqrt{s} = 200 GeV$ . The new inclusive jet data are sensitive to the gluon helicity distribution, $Δ g (x, Q^{2})$ , 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 $Δ g (x, Q^{2})$ . The results are in good agreement with previous measurements at $\sqrt{s} = 200 GeV$ and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that $Δ g (x, Q^{2})$ is positive for $x > 0.05$ .

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See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevD.103.L091103 for detailed correlation matrices for all measurements.

Phys. Rev. D 103, L091103– Published 26 May, 2021

Vol. 103, Iss. 9 — 1 May 2021

Received 9 March 2021
Accepted 28 April 2021

DOI: https://doi.org/10.1103/PhysRevD.103.L091103

Published 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.

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

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

Abstract

Physics Subject Headings (PhySH)

Article Text

Supplemental Material

References (74)

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