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Longitudinal and transverse spin transfer to $Λ$ and $\bar{Λ}$ hyperons in polarized $p + p$ collisions at $\sqrt{s} = 200 GeV$

M. I. Abdulhamid⁴, B. E. Aboona⁵⁵, J. Adam¹⁵, L. Adamczyk², J. R. Adams³⁹, I. Aggarwal⁴¹, M. M. Aggarwal⁴¹, Z. Ahammed⁶², D. M. Anderson⁵⁵ et al. (STAR Collaboration)

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¹Abilene Christian University, Abilene, Texas 79699
²AGH University of Krakow, FPACS, Cracow 30-059, Poland
³Argonne National Laboratory, Argonne, Illinois 60439
⁴American University in Cairo, New Cairo 11835, Egypt
⁵Ball State University, Muncie, Indiana 47306
⁶Brookhaven National Laboratory, Upton, New York 11973
⁷University of Calabria & INFN-Cosenza, Rende 87036, Italy
⁸University of California, Berkeley, California 94720
⁹University of California, Davis, California 95616
¹⁰University of California, Los Angeles, California 90095
¹¹University of California, Riverside, California 92521
¹²Central China Normal University, Wuhan, Hubei 430079
¹³University of Illinois at Chicago, Chicago, Illinois 60607
¹⁴Creighton University, Omaha, Nebraska 68178
¹⁵Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic
¹⁶Technische Universität Darmstadt, Darmstadt 64289, Germany
¹⁷National Institute of Technology Durgapur, Durgapur—713209, India
¹⁸ELTE Eötvös Loránd University, Budapest H-1117, Hungary
¹⁹Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany
²⁰Fudan University, Shanghai 200433
²¹University of Heidelberg, Heidelberg 69120, Germany
²²University of Houston, Houston, Texas 77204
²³Huzhou University, Huzhou, Zhejiang 313000
²⁴Indian Institute of Science Education and Research (IISER), Berhampur 760010, India
²⁵Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati 517507, India
²⁶Indian Institute Technology, Patna, Bihar 801106, India
²⁷Indiana University, Bloomington, Indiana 47408
²⁸Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000
²⁹University of Jammu, Jammu 180001, India
³⁰Kent State University, Kent, Ohio 44242
³¹University of Kentucky, Lexington, Kentucky 40506-0055
³²Lawrence Berkeley National Laboratory, Berkeley, California 94720
³³Lehigh University, Bethlehem, Pennsylvania 18015
³⁴Max-Planck-Institut für Physik, Munich 80805, Germany
³⁵Michigan State University, East Lansing, Michigan 48824
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
³⁹The Ohio State University, Columbus, Ohio 43210
⁴⁰Institute of Nuclear Physics PAN, Cracow 31-342, Poland
⁴¹Panjab University, Chandigarh 160014, India
⁴²Purdue University, West Lafayette, Indiana 47907
⁴³Rice University, Houston, Texas 77251
⁴⁴Rutgers University, Piscataway, New Jersey 08854
⁴⁵Universidade de São Paulo, São Paulo 05314-970, Brazil
⁴⁶University of Science and Technology of China, Hefei, Anhui 230026
⁴⁷South China Normal University, Guangzhou, Guangdong 510631
⁴⁸Sejong University, Seoul, 05006, South Korea
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
⁵⁹University of Chinese Academy of Sciences, Beijing 101408
⁶⁰United States Naval Academy, Annapolis, Maryland 21402
⁶¹Valparaiso University, Valparaiso, Indiana 46383
⁶²Variable Energy Cyclotron Centre, Kolkata 700064, India
⁶³Warsaw University of Technology, Warsaw 00-661, Poland
⁶⁴Wayne State University, Detroit, Michigan 48201
⁶⁵Yale University, New Haven, Connecticut 06520

^*Deceased.

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Phys. Rev. D 109, 012004 – Published 5 January, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.012004

Abstract

The longitudinal and transverse spin transfers to $Λ$ ( $\bar{Λ}$ ) hyperons in polarized proton-proton collisions are expected to be sensitive to the helicity and transversity distributions, respectively, of (anti)strange quarks in the proton, and to the corresponding polarized fragmentation functions. We report improved measurements of the longitudinal spin transfer coefficient, $D_{L L}$ , and the transverse spin transfer coefficient, $D_{T T}$ , to $Λ$ and $\bar{Λ}$ in polarized proton-proton collisions at $\sqrt{s} = 200 GeV$ by the STAR experiment at RHIC. The dataset includes longitudinally polarized proton-proton collisions with an integrated luminosity of $52 {pb}^{- 1}$ , and transversely polarized proton-proton collisions with a similar integrated luminosity. Both datasets have about twice the statistics of previous results and cover a kinematic range of $| η_{Λ (\bar{Λ})} | < 1.2$ and transverse momentum $p_{T, Λ (\bar{Λ})}$ up to $8 GeV / c$ . We also report the first measurements of the hyperon spin transfer coefficients $D_{L L}$ and $D_{T T}$ as a function of the fractional jet momentum $z$ carried by the hyperon, which can provide more direct constraints on the polarized fragmentation functions.

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Article Text

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Phys. Rev. D 109, 012004– Published 5 January, 2024

Vol. 109, Iss. 1 — 1 January 2024

Received 27 September 2023
Accepted 28 November 2023

DOI: https://doi.org/10.1103/PhysRevD.109.012004

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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Physical Review D

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Longitudinal and transverse spin transfer to $Λ$ and $\bar{Λ}$ hyperons in polarized $p + p$ collisions at $\sqrt{s} = 200 GeV$

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Longitudinal and transverse spin transfer to Λ and Λ¯ hyperons in polarized p+p collisions at s=200 GeV

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References (65)

Longitudinal and transverse spin transfer to $Λ$ and $\bar{Λ}$ hyperons in polarized $p + p$ collisions at $\sqrt{s} = 200 GeV$