Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at √s = 200  GeV

Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at √s = 200  GeV

We report a measurement of the longitudinal double-spin asymmetry ALL and the differential cross section for inclusive π0 production at midrapidity in polarized proton collisions at √s=200 GeV. The cross section was measured over a transverse momentum range of 1 < p[subscript T] < 17 GeV/c and...

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Bibliographic Details
Main Authors: Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, Alan Michael, Jones, Christopher LaDon, Kocoloski, Adam Philip, Leight, William Axel, Milner, Richard G, Redwine, Robert P, Sakuma, Tai, Seele, Joseph Patrick, Surrow, Bernd, van Nieuwenhuizen, Gerrit J, Walker, Matthew H
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Published: American Physical Society (APS) 2018
Online Access:http://hdl.handle.net/1721.1/116255
https://orcid.org/0000-0002-5515-4563
https://orcid.org/0000-0002-0031-1963
https://orcid.org/0000-0002-9107-6312
https://orcid.org/0000-0001-5839-707X
Description
Summary:We report a measurement of the longitudinal double-spin asymmetry ALL and the differential cross section for inclusive π0 production at midrapidity in polarized proton collisions at √s=200 GeV. The cross section was measured over a transverse momentum range of 1 < p[subscript T] < 17 GeV/c and found to be in good agreement with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry was measured in the range of 3.7 < pT < 11 GeV/c and excludes a maximal positive gluon polarization in the proton. The mean transverse momentum fraction of π0's in their parent jets was found to be around 0.7 for electromagnetically triggered events.

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