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Title: Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum

Abstract

We study the single-transverse-spin asymmetry for the Drell-Yan process. We consider production of the lepton pair at large transverse momentum, q{sub perpendicular}{approx}Q, where Q is the pair's mass. The spin asymmetry is then of higher twist and may be generated by twist-three quark-gluon correlation functions. Expanding the result for q{sub perpendicular}<<Q, we make contact with the transverse-momentum-dependent QCD factorization involving the so-called Sivers functions. We find that the two mechanisms, quark-gluon correlations on one hand and the Sivers effect on the other, contain the same physics in this region. This ties the two together and imposes an important constraint on phenomenological studies of single-transverse-spin asymmetries.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Physics Department, University of Maryland, College Park, Maryland 20742 (United States)
  2. Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
  3. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  4. (United States)
  5. RIKEN BNL Research Center, Building 510A, Brookhaven National Laboratory, Upton, New York 11973 (United States)
Publication Date:
OSTI Identifier:
20782992
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.73.094017; (c) 2006 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; CORRELATION FUNCTIONS; CORRELATIONS; DRELL MODEL; FACTORIZATION; GLUONS; INCLUSIVE INTERACTIONS; LEPTONS; QUANTUM CHROMODYNAMICS; QUARKS; REST MASS; SPIN; TRANSVERSE MOMENTUM

Citation Formats

Ji Xiangdong, Qiu Jianwei, Vogelsang, Werner, RIKEN BNL Research Center, Building 510A, Brookhaven National Laboratory, Upton, New York 11973, and Yuan Feng. Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum. United States: N. p., 2006. Web. doi:10.1103/PHYSREVD.73.094017.
Ji Xiangdong, Qiu Jianwei, Vogelsang, Werner, RIKEN BNL Research Center, Building 510A, Brookhaven National Laboratory, Upton, New York 11973, & Yuan Feng. Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum. United States. doi:10.1103/PHYSREVD.73.094017.
Ji Xiangdong, Qiu Jianwei, Vogelsang, Werner, RIKEN BNL Research Center, Building 510A, Brookhaven National Laboratory, Upton, New York 11973, and Yuan Feng. Mon . "Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum". United States. doi:10.1103/PHYSREVD.73.094017.
@article{osti_20782992,
title = {Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum},
author = {Ji Xiangdong and Qiu Jianwei and Vogelsang, Werner and RIKEN BNL Research Center, Building 510A, Brookhaven National Laboratory, Upton, New York 11973 and Yuan Feng},
abstractNote = {We study the single-transverse-spin asymmetry for the Drell-Yan process. We consider production of the lepton pair at large transverse momentum, q{sub perpendicular}{approx}Q, where Q is the pair's mass. The spin asymmetry is then of higher twist and may be generated by twist-three quark-gluon correlation functions. Expanding the result for q{sub perpendicular}<<Q, we make contact with the transverse-momentum-dependent QCD factorization involving the so-called Sivers functions. We find that the two mechanisms, quark-gluon correlations on one hand and the Sivers effect on the other, contain the same physics in this region. This ties the two together and imposes an important constraint on phenomenological studies of single-transverse-spin asymmetries.},
doi = {10.1103/PHYSREVD.73.094017},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 73,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}
  • 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 calculate the next-to-leading order perturbative QCD corrections to the transverse momentum weighted single transverse spin asymmetry in Drell-Yan lepton pair production in hadronic collisions. We identify the splitting function relevant for the scale evolution of the twist-three quark-gluon correlation function. We comment on the consequences of our results for phenomenology.
  • We show that the transverse double spin asymmetry in the Drell-Yan process contributed only from the Sivers functions can be picked out by the weighting function (Q{sub T}/M{sup 2})(cos({phi}-{phi}{sub S{sub 1}})cos({phi}-{phi}{sub S{sub 2}})+3sin({phi}-{phi}{sub S{sub 1}})sin = ({phi}-{phi}{sub S{sub 2}})). The asymmetry is proportional to the product of two Sivers functions from each hadron f{sub 1T}{sup perpendicular(1)}xf{sub 1T}{sup perpendicular(1)}. Using two sets of Sivers functions extracted from the semi-inclusive deeply elastic scattering data at HERMES, we estimate this asymmetry in the p{sup {up_arrow}}p{sup {up_arrow}} Drell-Yan process which is possible to be performed in high energy storage ring at GSI. The predictionmore » of double spin asymmetry in the Drell-Yan process contributed by the function g{sub 1T}(x,k{sub T}{sup 2}), which can be extracted by the weighting function (Q{sub T}/M{sup 2})(3cos({phi}-{phi}{sub S{sub 1}})cos({phi}-{phi}{sub S{sub 2}})+sin({phi}-{phi}{sub S{sub 1}})sin = ({phi}-{phi}{sub S{sub 2}})), is also given at GSI.« less
  • We study the underlying event in proton-antiproton collisions by examining the behavior of charged particles (transverse momentum p{sub T} > 0.5 GeV/c, pseudorapidity |{eta}| < 1) produced in association with large transverse momentum jets ({approx}2.2 fb{sup -1}) or with Drell-Yan lepton-pairs ({approx}2.7 fb{sup -1}) in the Z-boson mass region (70 < M(pair) < 110 GeV/c{sup 2}) as measured by CDF at 1.96 TeV center-of-mass energy. We use the direction of the lepton-pair (in Drell-Yan production) or the leading jet (in high-p{sub T} jet production) in each event to define three regions of {eta}-{phi} space; toward, away, and transverse, where {phi}more » is the azimuthal scattering angle. For Drell-Yan production (excluding the leptons) both the toward and transverse regions are very sensitive to the underlying event. In high-p{sub T} jet production the transverse region is very sensitive to the underlying event and is separated into a MAX and MIN transverse region, which helps separate the hard component (initial and final-state radiation) from the beam-beam remnant and multiple parton interaction components of the scattering. The data are corrected to the particle level to remove detector effects and are then compared with several QCD Monte-Carlo models. The goal of this analysis is to provide data that can be used to test and improve the QCD Monte-Carlo models of the underlying event that are used to simulate hadron-hadron collisions.« less