Transverse Quark Polarization in 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>Reactions,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml

Kane, Gordon L.; Pumplin, Jon; Repko, Wayne W.

doi:10.1103/physrevlett.41.1689

Cited by 365 publications

(375 citation statements)

References 13 publications

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“…A well known prediction of collinearly factorized perturbative Quantum Chromodynamics (pQCD) is that the cross-section for forward meson production in protonproton collisions should have negligible dependence on the transverse polarization of the incident proton [1]. This early prediction was contradicted by measurements [2][3][4][5][6] of sizable pion transverse single-spin asymmetries (A N ), defined for a forward moving polarized beam scattering to the left and with a vertical spin quantization axis as…”

mentioning

confidence: 78%

Transverse single-spin asymmetry and cross section forπ0andηmesons at large Feynmanxin
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D
82
1
33
0
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mentioning

confidence: 78%

Transverse single-spin asymmetry and cross section forπ0andηmesons at large Feynmanxin
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D
82
1
33
0
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“…Indeed, as shown in Ref. [46], in collinear pQCD A N appears only as the immaginary part of interference terms between spin-flip and no-spin-flip partonic scattering amplitudes. Since at LO these are real and helicity is conserved for massless partons, it was natural to expect A N ≃ α s m/ √ s. Contrary to these expectations several experimental observations, as seen in section 2, show sizable SSA's in the high-energy regime.…”

Section: Parton Model Approaches Including Intrinsic Transverse Motionmentioning

confidence: 99%

“…The origin of this approach could be traced back to the early paper by Kane et al [46], where it was shown how in a collinear QCD parton model any single spin asymmetry should be proportional to the quark mass. Although this result cannot explain the large values of A N observed, it was read as a signal of a higher twist effect.…”

Section: Twist-three Effects In Collinear Pqcdmentioning

confidence: 99%

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

183

100

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In this article we review the present understanding of azimuthal and single spin asymmetries for inclusive and semi-inclusive particle production in unpolarized and polarized hadronic collisions at high energy and moderately large transverse momentum. After summarizing the experimental information available, we discuss and compare the main theoretical approaches formulated in the framework of perturbative QCD. We then present in some detail a generalization of the parton model with inclusion of spin and intrinsic transverse momentum effects. In this context, we extensively discuss the phenomenology of azimuthal and single spin asymmetries for several processes in different kinematical configurations. A comparison with the predictions of other approaches, when available, is also given. We finally emphasize some relevant open points and challenges for future theoretical and experimental investigation.

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“…Note of course that for A jet N and A γ N the third term in Eq. (1) is not relevant, and the fragmentation functions D C/c (2) in the first two terms are not needed. 1 We see from Eq.…”

Section: Dσ( S ⊥mentioning

confidence: 99%

“…Large effects first measured in polarized lambda production at FermiLab [1] proved difficult to describe in perturbative QCD [2]. In the 1980s it was shown that quark-gluon-quark correlations in the nucleon could lead to substantial TSSAs [3].…”

Section: Introductionmentioning

confidence: 99%

Transverse single-spin asymmetries inp↑p→γXfrom quark-gluon-quark correlations in the proton

et al. 2015

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We analyze the transverse single-spin asymmetry in direct photon production from proton-proton collisions, denoted A γ N , within collinear twist-3 factorization. We provide a calculation of the contribution due to quark-gluon-quark correlations in the unpolarized proton as well as summarize previous studies on those effects in the polarized proton. Both soft-gluon poles and soft-fermion poles are considered. From this complete result we then estimate A γ N , including error bands due to uncertainties in the non-perturbative inputs, at kinematics relevant for planned measurements of this observable at the Relativistic Heavy Ion Collider. We find A γ N can allow for a "clean" extraction of the Qiu-Sterman function, which could lead to a definitive solution to the so-called "sign mismatch" crisis. Since we use the Sivers function extracted from semi-inclusive deep-inelastic scattering to develop our input for the Qiu-Sterman function, this reaction can also make a statement about the process dependence of the Sivers function.

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Transverse Quark Polarization in Large-pTReactions,e+e

Cited by 365 publications

References 13 publications

Transverse single-spin asymmetry and cross section forπ0andηmesons at large Feynmanxin
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D
82
1
33
0
View full text Add to dashboard Cite

Transverse single-spin asymmetry and cross section forπ0andηmesons at large Feynmanxin
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D
82
1
33
0
View full text Add to dashboard Cite

Azimuthal and single spin asymmetries in hard scattering processes

Transverse single-spin asymmetries inp↑p→γXfrom quark-gluon-quark correlations in the proton

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Transverse Quark Polarization in Large-pTReactions,e+e

Cited by 365 publications

References 13 publications

Transverse single-spin asymmetry and cross section forπ0andηmesons at large FeynmanxinAdamczyk1, Agakishiev2, Aggarwal3 et al. 2012Phys. Rev. D821330View full textAdd to dashboardCite

Transverse single-spin asymmetry and cross section forπ0andηmesons at large FeynmanxinAdamczyk1, Agakishiev2, Aggarwal3 et al. 2012Phys. Rev. D821330View full textAdd to dashboardCite

Azimuthal and single spin asymmetries in hard scattering processes

Transverse single-spin asymmetries inp↑p→γXfrom quark-gluon-quark correlations in the proton

Contact Info

Product

Resources

About

Transverse single-spin asymmetry and cross section forπ0andηmesons at large Feynmanxin
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D
82
1
33
0
View full text Add to dashboard Cite

Transverse single-spin asymmetry and cross section forπ0andηmesons at large Feynmanxin
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D
82
1
33
0
View full text Add to dashboard Cite