Quantum-chromodynamic predictions for large-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>hadron production with transversely polarized beam and target

Hidaka, K.; Monsay, Evelyn H.; Sivers, Dennis

doi:10.1103/physrevd.19.1503

Cited by 24 publications

(19 citation statements)

References 27 publications

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“…Furthermore the requirement of helicity conservation in hard scattering requires qq orqq scattering to proceed via an interference between direct and exchange graphs as shown in Figure 1, reducing the contribution to the cross section by a factor of ∼ 1 11 . [4,5]. The net result is…”

Section: Parton Distribution Functions and Selection Rules In Polamentioning

confidence: 99%

QCD selection rules in polarized hadron collisions

Jaffe

Saito

1996

Physics Letters B

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Plans are underway to measure spin asymmetries at large momentum transfer in hadron hadron collisions at RHIC and elsewhere. Proposals have focused on measuring quark transversity and quark and gluon helicity distributions in the nucleon. These experiments will also provide a strong and simple test of perturbative QCD, namely that A T T /A LL ≪ 1 in pp → 2 jets + X and several related processes, whereas A T T /A LL ∼ 1 in Drell-Yan production of muon pairs. The prediction tests the helicity, twist and chirality selection rules of perturbative QCD that form the foundation for the analysis of spin dependent hard processes. We estimate the ratio A T T /A LL numerically for polarized protons at RHIC.

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Section: Parton Distribution Functions and Selection Rules In Polamentioning

confidence: 99%

QCD selection rules in polarized hadron collisions

Jaffe

Saito

1996

Physics Letters B

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“…We also briefly comment on the Drell-Yan process and alternative methods of filtering for transversity which involve special types of fragmentation functions. It should be stressed that studies of A TT have been presented in the past [4][5][6][7]. These have usually [6,7] been based on the model assumption δf (x, µ) = ∆f (x, µ) for all scales µ, which cannot be valid in QCD due to the different µ-evolutions of δf and ∆f .…”

mentioning

confidence: 99%

“…On the downside, transverse double-spin asymmetries are expected to be very small in general [4,6,7]. Unpolarized gluons play an important or even dominant role in almost all production processes.…”

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confidence: 99%

Accessing transversity in double-spin asymmetries at the BNL RHIC

2002

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We give upper bounds for transverse double-spin asymmetries in polarized proton-proton collisions by saturating the positivity constraint for the transversity densities at a low hadronic resolution scale. We consider prompt photon, jet, pion, and heavy flavor production at the BNL Relativistic Heavy Ion Collider (RHIC). Estimates of the expected statistical accuracy for such measurements are presented, taking into account the acceptance of the RHIC detectors.

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“…The two standard processes are jet production and the Drell-Yan process. But jet production has a numerically small asymmetry [9] in the hard scattering. The Drell-Yan process, with a large asymmetry in the hard scattering [10], needs a polarized antiproton beam with good luminosity to make it a valence process with a reasonable event rate.…”

Section: Introductionmentioning

confidence: 99%

Fragmentation of transversely polarized quarks probed in transverse momentum distributions

Collins¹

1993

Nuclear Physics B

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1,159

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It is shown that the azimuthal dependence of the distribution of hadrons in a quark jet is a probe of the transverse spin of the quark initiating the jet. This results in a new spin-dependent fragmentation function that acts at the twist-2 level. One example of a process where it contributes is semi-inclusive deeply inelastic scattering with a transversely polarized nucleon target but with an unpolarized electron beam. This process is treated in detail. Another process is the cross section for singly polarized hadron-hadron scattering when two high p ⊥ hadrons are measured in the final state and are close to back-to-back in azimuth. The new fragmentation function is sensitive to the coupling of the fragmentation process to (spontaneous) chiral symmetry breaking.

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Quantum-chromodynamic predictions for large-pThadron production with transversely polarized beam and target

Cited by 24 publications

References 27 publications

QCD selection rules in polarized hadron collisions

QCD selection rules in polarized hadron collisions

Accessing transversity in double-spin asymmetries at the BNL RHIC

Fragmentation of transversely polarized quarks probed in transverse momentum distributions

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