scholarly journals Single-Spin Asymmetries AULsinϕh in Semi-Inclusive Pions Production

2016 ◽  
Vol 40 ◽  
pp. 1660045 ◽  
Author(s):  
Zhun Lu ◽  
Wenjuan Mao
Keyword(s):  
Pion Production ◽  
Neutral Pion ◽  
Spin Asymmetry ◽  
Distribution Functions ◽  
Proton Target ◽  
Deuteron Target ◽  
Transverse Momentum Dependent ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Single Spin Asymmetries

The single-spin asymmetry [Formula: see text] of charged and neutral pion production in semi-inclusive deep-inelastic scattering on longitudinally polarized nucleon targets is studied. We particularly consider the effects of the twist-3 transverse-momentum dependent distribution functions [Formula: see text] and [Formula: see text], which are calculated in two different spectator-diquark models. We estimate the asymmetry for [Formula: see text], [Formula: see text] and [Formula: see text] produced off the proton target at HERMES and compare the results with the HERMES measurements. We also predict the same asymmetric moment for different pions at the kinematics of CLAS 5.5 GeV on a proton target, as well as at COMPASS on a deuteron target for comparison.

Predictions on the Transverse Single-Spin Asymmetries at Subleading Twist of Pion Production in Semi-Inclusive DIS

2016 ◽  
Vol 40 ◽  
pp. 1660030
Author(s):  
Wenjuan Mao ◽  
Zhun Lu ◽  
Bo-Qiang Ma
Keyword(s):  
Transverse Momentum ◽  
Pion Production ◽  
Diquark Model ◽  
Transverse Momentum Dependent ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Single Spin Asymmetries ◽  
Fragmentation Functions

We estimate the single-spin asymmetries with [Formula: see text] and [Formula: see text] angular dependencies for electroproduction of pions in transversely polarized semi-inclusive DIS process. We consider the effect of the twist-3 transverse momentum dependent distributions which convoluted with twist-2 fragmentation functions. We calculate these distributions in a spectator-diquark model, and predict the corresponding single-spin asymmetries at the kinematics of HERMES, JLab and COMPASS. We find that the numerical estimates show that the asymmetries are sizable, and the T-odd twist-3 TMDs play an important role in these asymmetries.

TRANSVERSITY AND AZIMUTHAL SPIN ASYMMETRY OF PION ELECTROPRODUCTION

2003 ◽  
Vol 18 (08) ◽  
pp. 1381-1390
Author(s):  
BO-QIANG MA
Keyword(s):  
Inelastic Scattering ◽  
Light Cone ◽  
Charged Lepton ◽  
Pion Production ◽  
Neutral Pion ◽  
Spin Asymmetry ◽  
Proton Target ◽  
Diquark Model ◽  
Spin Asymmetries ◽  
Fragmentation Functions

The quark transversity distributions are discussed in a light-cone SU(6) quark-diquark model and in a perturbative QCD based analysis. The azimuthal spin asymmetries, both for charged and neutral pion production in semi-inclusive deep inelastic scattering of unpolarized charged lepton beams on longitudinally and transversely polarized nucleon targets, are analyzed. It is found that different approaches to the distribution and fragmentation functions may lead to quite different predictions. It is also found that the unfavored quark to pion fragmentation functions should be taken into account for π- production from a proton target.

scholarly journals Single-spin asymmetry ATsin(2ϕ−ϕS) in π−p Drell-Yan process within TMD factorization

2022 ◽  
Vol 258 ◽  
pp. 03002
Author(s):  
Hui Li ◽  
Xiaoyu Wang ◽  
Zhun Lu
Keyword(s):  
Spin Asymmetry ◽  
Distribution Functions ◽  
Single Spin Asymmetry ◽  
Parton Distribution Functions ◽  
Sudakov Form Factor ◽  
Transverse Momentum Dependent ◽  
Single Spin ◽  
Mulders Function ◽  
Light Cone Wave Function ◽  
The Asymmetry

We study the single-spin asymmetry ATsin(2ϕ−ϕS) in the pion-induced Drell-Yan process within the transverse momentum dependent factorization (TMD factorization). The asymmetry can be expressed as the convolution of the Boer-Mulders function and the transversity function. We numerically estimate the asymmetry ATsin(2ϕ−ϕS) at the COMPASS kinematics with the model results for the pion meson distributions from the light-cone wave function approach and the available parametrization for the proton distributions. We also include the TMD evolution formalism both proton and pion parton distribution functions by using two different parametrizations on nonperturbative Sudakov form factor. We find that the asymmetry ATsin(2ϕ−ϕS) as functions of xp, xπ, xF and q⊥ is qualitatively consistent with the recent COMPASS measurement.

scholarly journals Transverse Single-Spin Asymmetry for Very Forward Neutral Pion Production in Polarized p+p Collisions at s=510  GeV

2020 ◽  
Vol 124 (25) ◽  
Author(s):  
M. H. Kim ◽  
O. Adriani ◽  
E. Berti ◽  
L. Bonechi ◽  
R. D’Alessandro ◽  
...  
Keyword(s):  
Pion Production ◽  
Neutral Pion ◽  
Spin Asymmetry ◽  
Single Spin Asymmetry ◽  
Single Spin

HADRON STRUCTURE STUDY IN FORTHCOMING DRELL–YAN EXPERIMENTS: COMPASS PROJECT AT CERN

2009 ◽  
Vol 24 (35n37) ◽  
pp. 3033-3044 ◽  
Author(s):  
◽  
OLEG DENISOV
Keyword(s):  
Transverse Momentum ◽  
Structure Study ◽  
Distribution Functions ◽  
Proton Target ◽  
Production Mechanism ◽  
Hadron Structure ◽  
Parton Distribution Functions ◽  
Transverse Momentum Dependent ◽  
Spin Asymmetries ◽  
Hadron Beam

The study of Drell–Yan (DY) processes involving the collision of an (un)polarised hadron beam on an (un)polarised proton target can result in a fundamental improvement of our knowledge on the transverse momentum dependent (TMDs) parton distribution functions (PDFs) of hadrons. The production mechanism of J/ψ and J/ψ - DY duality can also be addressed. One of the forthcoming polarised DY experiments (COMPASS (SPS, CERN)) is discussed in this context. The most important features of this project are briefly reviewed, as well as its sensitivity to the various transverse momentum dependent spin asymmetries.

Single-spin asymmetry of inclusive neutral-pion production in pp ↑ interactions at 70 GeV in the region −0.4 < x F < −0.1

2005 ◽  
Vol 68 (11) ◽  
pp. 1790-1795 ◽  
Author(s):  
A. N. Vasiliev ◽  
V. N. Grishin ◽  
A. M. Davidenko ◽  
A. A. Derevshchikov ◽  
Yu. A. Matulenko ◽  
...  
Keyword(s):  
Pion Production ◽  
Neutral Pion ◽  
Spin Asymmetry ◽  
Single Spin Asymmetry ◽  
Single Spin

scholarly journals Single-spin asymmetries for small-angle pion production in high-energy hadron collisions

1999 ◽  
Vol 11 (4) ◽  
pp. 703-708 ◽  
Author(s):  
A. Ahmedov ◽  
I.V. Akushevich ◽  
E.A. Kuraev ◽  
P.G. Ratcliffe
Keyword(s):  
Small Angle ◽  
Pion Production ◽  
High Energy ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Single Spin Asymmetries ◽  
Energy Hadron
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