<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Hyperon Polarization in Inclusive Production by 300-GeV Protons on Beryllium

Bunce, G.; Handler, R.; March, R.; Martin, P.; Pondrom, L.; Sheaff, M.; Heller, Kenneth; Overseth, O. E.; Skubic, P.; Devlin, T.; Edelman, B.; Edwards, Roderick; Norem, J.; Schachinger, L.; Yamin, P.

doi:10.1103/physrevlett.36.1113

Cited by 434 publications

(381 citation statements)

References 5 publications

Supporting

Mentioning

364

Contrasting

Unclassified

Order By: Relevance

“…For its impact on the later developments we mention, for instance, the work on the transverse Λ polarization by Bunce et al [45]. SSA's significantly different from zero were found for the p ↑ p → π + X process in the forward production region (large positive x F ), at relatively small transverse momentum, p T .…”

Section: Transverse Single Spin Asymmetries For P ↑ P → H + X Processesmentioning

confidence: 99%

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

183

100

View full text Add to dashboard Cite

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.

show abstract

Section: Transverse Single Spin Asymmetries For P ↑ P → H + X Processesmentioning

confidence: 99%

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

183

100

View full text Add to dashboard Cite

show abstract

“…In fact, in the past years several experiments have been performed that still await for a correct interpretation of the resulting data. Among others, hadronic collisions on transversely polarized proton targets [1,2,3,4], where an azimuthally asymmetric distribution of final-state products (with respect to the normal of the production plane) is observed when flipping the transverse spin of the target or of the final products, the so-called transverse spin asymmetry. Perturbative QCD cannot accommodate for such asymmetries, sometimes as large as 40% also at high energy [1].…”

Section: Introductionmentioning

confidence: 99%

“…Among others, hadronic collisions on transversely polarized proton targets [1,2,3,4], where an azimuthally asymmetric distribution of final-state products (with respect to the normal of the production plane) is observed when flipping the transverse spin of the target or of the final products, the so-called transverse spin asymmetry. Perturbative QCD cannot accommodate for such asymmetries, sometimes as large as 40% also at high energy [1]. This problem has triggered a growing interest in this field of hadronic spin physics; new data and rapid developments are foreseen in the near future, as it emerged in a recently devoted workshop [5] (for a review covering also processes with lepton beams, see Refs.…”

Section: Introductionmentioning

confidence: 99%

Azimuthal asymmetries in unpolarized Drell–Yan events on nuclear targets

Bianconi

Radici

2005

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

We show that for Drell-Yan events by unpolarized hadronic projectiles and nuclear targets, azimuthal asymmetries can arise from the nuclear distortion of the hadronic projectile wave function, typically a spin-orbit effect occurring on the nuclear surface. The asymmetry depends on quantities that enter also the spin asymmetry in the corresponding Drell-Yan event on polarized free nucleonic targets. Hence, this study can be of help in exploring the spin structure of the nucleon, in particular the transverse spin distribution of partons inside the proton. All arguments can be extended also to antinucleon projectiles and, consequently, apply to possible future measurements involving nuclear targets at the foreseen HESR ring at GSI.

show abstract

“…(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. (1) that for the process of hadron production, which as we mentioned has been intensely studied for close to 40 years, the distribution and fragmentation twist-3 contributions to the cross section cannot be disentangled, i.e., all of them are summed together in the cross section.…”

Section: Dσ( S ⊥mentioning

confidence: 98%

“…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

View full text Add to dashboard Cite

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.

show abstract

Λ0Hyperon Polarization in Inclusive Production by 300-GeV Protons on Beryllium

Cited by 434 publications

References 5 publications

Azimuthal and single spin asymmetries in hard scattering processes

Azimuthal and single spin asymmetries in hard scattering processes

Azimuthal asymmetries in unpolarized Drell–Yan events on nuclear targets

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

Contact Info

Product

Resources

About