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Title: Generalized TMDs and the exclusive double Drell–Yan process

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1360988
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 771; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-28 11:40:47; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Bhattacharya, Shohini, Metz, Andreas, and Zhou, Jian. Generalized TMDs and the exclusive double Drell–Yan process. Netherlands: N. p., 2017. Web. doi:10.1016/j.physletb.2017.05.081.
Bhattacharya, Shohini, Metz, Andreas, & Zhou, Jian. Generalized TMDs and the exclusive double Drell–Yan process. Netherlands. doi:10.1016/j.physletb.2017.05.081.
Bhattacharya, Shohini, Metz, Andreas, and Zhou, Jian. 2017. "Generalized TMDs and the exclusive double Drell–Yan process". Netherlands. doi:10.1016/j.physletb.2017.05.081.
@article{osti_1360988,
title = {Generalized TMDs and the exclusive double Drell–Yan process},
author = {Bhattacharya, Shohini and Metz, Andreas and Zhou, Jian},
abstractNote = {},
doi = {10.1016/j.physletb.2017.05.081},
journal = {Physics Letters. Section B},
number = C,
volume = 771,
place = {Netherlands},
year = 2017,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2017.05.081

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  • We present a comprehensive formalism for dilepton production from the collision of two polarized spin-(1/2) hadronsby identifying the general angular distribution of the cross section in combination with a complete set of structure functions. The various structure functions are computed in the parton model approximation where we mainly consider the case when the transverse momentum of the dilepton pair is much smaller than its invariant mass. In this kinematical region dilepton production can be described in terms of transverse momentum dependent parton distributions.
  • 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
  • The longitudinal-transverse spin asymmetry A{sub LT} in the polarized Drell-Yan process depends on twist-3 quark distributions of nucleon. In addition to the contributions associated with the twist-3 operators, these distributions contain the 'Wandzura-Wilczek (WW)' part, which is determined by a certain integral of twist-2 distributions. The recently obtained empirical information on the transversity allows a realistic estimate of the WW contribution to A{sub LT} for the polarized pp-bar collisions. Our results indicate that rather large A{sub LT}({approx}10%) can be observed in the proposed spin experiments at GSI, with novel pattern as a function of dilepton mass compared with A{sub TT}more » and A{sub LL}.« less
  • Parton distributions in impact parameter space, which are obtained by Fourier transforming GPDs, exhibit a significant deviation from axial symmetry when target and/or quark are transversely polarized. In combination with the final state interactions, this transverse deformation provides a natural mechanism for naive-T odd transverse single-spin asymmetries in semi-inclusive DIS. Under QCD evolution, long-range color correlations rapidly and hence this 'chromodynamic lensing mechanism' rapidly disappear. The deformation of PDFs in impact parameter space can also be related to the transverse force acting on the active quark in polarized DIS at higher twist.
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