skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Single-transverse spin asymmetry in dijet correlations at hadron colliders

Abstract

We present a phenomenological study of the single-transverse spin asymmetry in azimuthal correlations of two jets produced nearly 'back-to-back' in pp collisions at RHIC. We properly take into account the initial- and final-state interactions of partons that can generate this asymmetry in QCD hard-scattering. Using distribution functions fitted to the existing single-spin data, we make predictions for various weighted single-spin asymmetries in dijet correlations that are now readily testable at RHIC.

Authors:
;  [1];  [2];  [3]
  1. Department of Physics and Astronomy, Vrije Universiteit Amsterdam, NL-1081 HV Amsterdam (Netherlands)
  2. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  3. RIKEN BNL Research Center, Building 510A, Brookhaven National Laboratory, Upton, New York 11973 (United States)
Publication Date:
OSTI Identifier:
21020279
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.75.074019; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BROOKHAVEN RHIC; CORRELATIONS; DISTRIBUTION FUNCTIONS; FINAL-STATE INTERACTIONS; GLUONS; HARD COLLISION MODELS; INCLUSIVE INTERACTIONS; JET MODEL; PROTON-PROTON INTERACTIONS; QUANTUM CHROMODYNAMICS; QUARKS; SCATTERING; SPIN

Citation Formats

Bomhof, C. J., Mulders, P. J., Vogelsang, W., and Yuan, F. Single-transverse spin asymmetry in dijet correlations at hadron colliders. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.074019.
Bomhof, C. J., Mulders, P. J., Vogelsang, W., & Yuan, F. Single-transverse spin asymmetry in dijet correlations at hadron colliders. United States. doi:10.1103/PHYSREVD.75.074019.
Bomhof, C. J., Mulders, P. J., Vogelsang, W., and Yuan, F. Sun . "Single-transverse spin asymmetry in dijet correlations at hadron colliders". United States. doi:10.1103/PHYSREVD.75.074019.
@article{osti_21020279,
title = {Single-transverse spin asymmetry in dijet correlations at hadron colliders},
author = {Bomhof, C. J. and Mulders, P. J. and Vogelsang, W. and Yuan, F.},
abstractNote = {We present a phenomenological study of the single-transverse spin asymmetry in azimuthal correlations of two jets produced nearly 'back-to-back' in pp collisions at RHIC. We properly take into account the initial- and final-state interactions of partons that can generate this asymmetry in QCD hard-scattering. Using distribution functions fitted to the existing single-spin data, we make predictions for various weighted single-spin asymmetries in dijet correlations that are now readily testable at RHIC.},
doi = {10.1103/PHYSREVD.75.074019},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 75,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • We study the single-transverse-spin asymmetry for dijet production in hadronic collisions in both the collinear QCD factorization approach and the Brodsky-Hwang-Schmidt model. We show that a nonvanishing asymmetry is generated by both initial-state and final-state interactions, and that the final-state interactions dominate. We find that in the leading kinematic region where the transverse momentum imbalance of the two jets, q-vector{sub perpendicular}=P-vector{sub 1perpendicular}+P-vector{sub 2perpendicular}, is much less than the momentum of either jet, the contribution from the lowest nontrivial perturbative order to both the spin-averaged and the spin-dependent dijet cross sections can be factorized into a hard part that is amore » function only of the averaged jet momentum P-vector{sub perpendicular}=(P-vector{sub 1perpendicular}-P-vector{sub 2perpendicular})/2, and perturbatively generated transverse momentum dependent (TMD) parton distributions. We show that the spin asymmetry at this nontrivial perturbative order can be described by the TMD parton distributions defined in either semi-inclusive deep inelastic scattering or the Drell-Yan process. We derive the same hard parts from both the collinear factorization approach and in the context of the Brodsky-Hwang-Schmidt model, verifying that they are not sensitive to details of the factorized long-distance physics.« less
  • This Brief Report is an addendum to a previous Letter. The usefulness of measuring Drell-Yan pairs in single-spin hadron-hadron collisions is discussed in more detail and the following points are explicitly shown. (i) In the central rapidity region, the average transverse momentum and the left-right asymmetry of the produced Drell-Yan pairs should not only be nonvanishing, but also be much larger than those of the produced mesons. (ii) The effect of QCD corrections on the proposed model do not change the qualitative features of the results published in the Letter.
  • We analyze the single transverse-spin asymmetry (SSAs) for inclusive hadron production in the pp collision at RHIC based on the twist-3 mechanism in QCD. As an origin of SSAs, we take into account of all kinds of pole contributions associated with the twist-3 quark-gluon correlation functions in the polarized proton. By the inclusion of the soft-fermion-pole contribution in addition to the soft-gluon-pole contribution, we find SSAs observed at RHIC are better described for all kinds of mesons. P{sub T} dependence of the asymmetry and the comparison with the FNAL data are also presented.
  • We study the single transverse-spin asymmetry for open charm production in the semiinclusive lepton-hadron deep inelastic scattering (SIDIS) and pp collision. Within collinear factorization approach, we find that the asymmetry is sensitive to the twist-3 trigluon correlation functions in the proton. With a simple model for the trigluon correlation functions, we estimate the asymmetry in SIDIS for both COMPASS and eRHIC kinematics, as well as in pp collision at RHIC energy. We discuss the possibilities of extracting the trigluon correlation functions in these experiments.
  • Theoretical arguments and experimental facts are presented which show the following. Left-right asymmetries are expected to exist in a number of single-spin inclusive production processes. Measuring such asymmetries by using different types of projectile-target combinations, one can obtain useful information on the spin structure of hadrons in general, and determine the spin-dependent quark distribution functions in particular. Quantitative predictions for these asymmetries in various reactions are presented.