Measurement of parity-violating spin asymmetries in W+- production at midrapidity in longitudinally polarized pþp collisions

Adare, A. and Makek, Mihael and Zou, L. (PHENIX Collaboration) (2016) Measurement of parity-violating spin asymmetries in W+- production at midrapidity in longitudinally polarized pþp collisions. Physical Review C, 93 (5). 51103(R)-8. ISSN 2469-9985

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Abstract

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.

Item Type: Article
Date: 23 March 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 American Physical Society. Received 29 April 2015; published 23 March 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 24 Apr 2016 17:28
Last Modified: 24 Apr 2016 17:29
URI: http://digre.pmf.unizg.hr/id/eprint/4788

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