UNIFYING THE MECHANISMS FOR SINGLE SPIN ASYMMETRIES IN HARD PROCESSES.

Title: UNIFYING THE MECHANISMS FOR SINGLE SPIN ASYMMETRIES IN HARD PROCESSES.

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Authors:: YUAN, F.

Publication Date:: Wed May 10 00:00:00 EDT 2006

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: DOE/SC AND RIKEN

OSTI Identifier:: 883033

Report Number(s):: BNL-75820-2006-CP
R&D Project: PO-3; KB-02-01

DOE Contract Number:: DE-AC02-98CH10886

Resource Type:: Conference

Resource Relation:: Conference: XIV INTERNATIONAL WORKSHOP ON DEEP INELASTIC SCATTERING DIS 2006; TSUKUBA, JAPAN; 20060420 through 20060424

Country of Publication:: United States

Language:: English

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                    YUAN, F. UNIFYING THE MECHANISMS FOR SINGLE SPIN ASYMMETRIES IN HARD PROCESSES..  United States: N. p., 2006. 
        Web.

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                    YUAN, F. UNIFYING THE MECHANISMS FOR SINGLE SPIN ASYMMETRIES IN HARD PROCESSES..  United States.

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                    YUAN, F. Wed .  
        "UNIFYING THE MECHANISMS FOR SINGLE SPIN ASYMMETRIES IN HARD PROCESSES.".  United States.  
        doi:.  https://www.osti.gov/servlets/purl/883033.

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@article{osti_883033,

  title        = {UNIFYING THE MECHANISMS FOR SINGLE SPIN ASYMMETRIES IN HARD PROCESSES.},

  author       = {YUAN, F.},

  abstractNote = {},

  doi          = {},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Wed May 10 00:00:00 EDT 2006},

  month        = {Wed May 10 00:00:00 EDT 2006}

}

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Unified Picture for Single Transverse-Spin Asymmetries in Hard-Scattering Processes

Ji Xiangdong ; Physics Department, Peking University, Beijing 100871 ; Qiu Jianwei ; ... - Physical Review Letters

Using lepton-pair production in hadron-hadron collisions as an example, we explore the relation between two well-known mechanisms for single-transverse-spin asymmetries in hard processes: twist-three quark-gluon correlations when the pair's transverse momentum is large, q{sub perpendicular}>>{lambda}{sub QCD}, and time-reversal-odd and transverse-momentum-dependent parton distributions when q{sub perpendicular} is much less than the pair's mass. We find that, although the two mechanisms each have their own domain of validity, they describe the same physics in the kinematic region where they overlap. This unifies the two mechanisms and imposes an important constraint on phenomenological studies.
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Single-spin production asymmetries from the hard scattering of pointlike constituents

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When one takes into account the transverse momenta of the constituents in a polarized proton, there exists a kinematic, trigger-bias,'' effect in the formulation of the QCD-based hard-scattering model which can lead to single-spin production asymmetries. It seems convenient to represent the coherent spin-orbit forces in a polarized proton by defining an asymmetry in the transverse-momentum distribution of the fundamental constituents. It may then be possible to organize the hard-scattering model so that the kinematic constraints of hard 2{r arrow}2 scattering provide the leading contribution at large transverse momentum to asymmetries of the type {ital A}{sub {ital N}}d{sigma}(hp{sub {up arrow}}{rmore »« less
DOI: 10.1103/PhysRevD.41.83
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Brodsky, S.

It is usually assumed--following the parton model--that the leading-twist structure functions measured in deep inelastic lepton-proton scattering are simply the probability distributions for finding quarks and gluons in the target nucleon. In fact, gluon exchange between the outgoing quarks and the target spectators effects the leading-twist structure functions in a profound way, leading to diffractive leptoproduction processes, shadowing and antishadowing of nuclear structure functions, and target spin asymmetries, physics not incorporated in the light-front wavefunctions of the target computed in isolation. In particular, final-state interactions from gluon exchange lead to single-spin asymmetries in semi-inclusive deep inelastic lepton-proton scattering which aremore »« less
DOI: 10.2172/839974

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Hard-scattering scaling laws for single-spin production asymmetries

Sivers, D. - Physical Review, D (Particles Fields); (USA)

The extraction of a scaling law of the form (({ital p}{sub {ital T}}{sup 2}+{mu}{sup 2})/{mu}{ital p}{sub {ital T}}){ital A}{sub {ital N}}{congruent}{ital g}({ital x}{sub {ital T}}) (where {ital x}{sub {ital T}}=2{ital p}{sub {ital T}}/ {radical}{ital s} ) from data on a single-spin production asymmetry such as {ital A}{sub {ital N}d}{sigma}({ital pp}{sub {up arrow}}{r arrow}{pi}{sup 0}{ital X}) at large transverse momentum can be used to argue for an underlying hard-scattering'' mechanism. Data from the upcoming Fermilab polarized beam experiment (E-704) can be used to test the scaling hypothesis.
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Single spin asymmetries in muon pair production

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Theoretical analyses of polarized leptoproduction data suggest that the polarized gluon structure function might be large, but there has been no independent measurement of this quantity. Measurements of single spin asymmetries in the production of muon pairs from the scattering of two protons, one of which is longitudinally polarized, can be interpreted in terms of polarized gluon and polarized quark structure functions. Here we compute the asymmetries for the parton subprocesses that contribute to the measured muon pair production.