Measurement of parity-violating spin asymmetries in W � production at midrapidity in longitudinally polarized p +p collisions MEASUREMENT of PARITY-VIOLATING SPIN ... A. ADARE et al.

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Title:	Measurement of parity-violating spin asymmetries in W � production at midrapidity in longitudinally polarized p +p collisions MEASUREMENT of PARITY-VIOLATING SPIN ... A. ADARE et al.
Authors:	彭仁傑;Adare, A;Makek, Mihael;Zou, L;Collaboration, PHENIX
Contributors:	高能與強場物理研究中心
Keywords:	Fizika;Prirodne znanosti
Date:	2016-03-23
Issue Date:	2026-04-23 12:04:16 (UTC+8)
Publisher:	American Physical Society
Abstract:	摘要： We present midrapidity measurements from the PHENIX experiment of large parity-violating single-spin asymmetries of high transverse momentum electrons and positrons from W±/Z decays, produced in longitudinally polarized p+p collisions at center of mass energies of s√=500 and 510 GeV. These asymmetries allow direct access to the antiquark polarized parton distribution functions due to the parity-violating nature of the W-boson coupling to quarks and antiquarks. The results presented are based on data collected in 2011, 2012, and 2013 with an integrated luminosity of 240 pb−1, which exceeds previous PHENIX published results by a factor of more than 27. These high Q2 data probe the parton structure of the proton at W mass scale and provide an important addition to our understanding of the antiquark parton helicity distribution functions at an intermediate Bjorken x value of roughly MW/s√=0.16. 出版日期： 2016 版權： info:eu-repo/semantics/openAccess http://rightsstatements.org/vocab/InC/1.0 識別號： ISSN: 2470-0029 識別號： DOI: 10.1103/physrevd.93.051103
Appears in Collections:	[Center for High Energy and High Field Physics (CHiP)] journal & Dissertation

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