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Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at s = 500 GeV

AdamczyK, L.
•
Adams, J. R.
•
Adkins, J. K.
altro
ZyzaK, M.
2018
  • journal article

Periodico
PHYSICAL REVIEW D
Abstract
We report the first measurements of transverse single-spin asymmetries for inclusive jet and jet+π± production at midrapidity from transversely polarized proton-proton collisions at s=500 GeV. The data were collected in 2011 with the STAR detector sampled from 23 pb-1 integrated luminosity with an average beam polarization of 53%. Asymmetries are reported for jets with transverse momenta 6<pT<55 GeV/c and pseudorapidity |η|<1. Presented are measurements of the inclusive-jet azimuthal transverse single-spin asymmetry, sensitive to twist-3 initial-state quark-gluon correlators; the Collins asymmetry, sensitive to quark transversity coupled to the polarized Collins fragmentation function; and the first measurement of the “Collins-like” asymmetry, sensitive to linearly polarized gluons. Within the present statistical precision, inclusive-jet and Collins-like asymmetries are small, with the latter allowing the first experimental constraints on gluon linear polarization in a polarized proton. At higher values of jet transverse momenta, we observe the first nonzero Collins asymmetries in polarized-proton collisions, with a statistical significance of greater than 5σ. The results span a range of x similar to results from semi-inclusive deep-inelastic scattering but at much higher Q2. The Collins results enable tests of universality and factorization breaking in the transverse momentum-dependent formulation of perturbative quantum chromodynamics.
DOI
10.1103/PhysRevD.97.032004
WOS
WOS:000424057200002
Archivio
http://hdl.handle.net/11368/2941647
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85043399656
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.97.032004
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
FVG url
https://arts.units.it/bitstream/11368/2941647/1/PhysRevD.97.032004.pdf
Soggetti
  • Azimuthal

  • jet

  • RHIC

  • STAR

Scopus© citazioni
18
Data di acquisizione
Jun 14, 2022
Vedi dettagli
Web of Science© citazioni
25
Data di acquisizione
Mar 27, 2024
Visualizzazioni
2
Data di acquisizione
Apr 19, 2024
Vedi dettagli
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