scholarly journals Towards an explanation of transverse single-spin asymmetries in proton-proton collisions: The role of fragmentation in collinear factorization

2014 ◽  
Vol 89 (11) ◽  
Author(s):  
Koichi Kanazawa ◽  
Yuji Koike ◽  
Andreas Metz ◽  
Daniel Pitonyak
Keyword(s):  
Collinear Factorization ◽  
Proton Proton ◽  
Spin Asymmetries ◽  
Proton Collisions ◽  
Single Spin ◽  
Single Spin Asymmetries ◽  
Proton Proton Collisions

scholarly journals Transverse Single-Spin Asymmetries in Proton-Proton Collisions at the AFTER@LHC Experiment in a TMD Factorisation Scheme

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
M. Anselmino ◽  
U. D’Alesio ◽  
S. Melis
Keyword(s):  
Spin Asymmetry ◽  
Parton Model ◽  
Fixed Target ◽  
Proton Proton ◽  
Spin Asymmetries ◽  
Proton Collisions ◽  
Single Spin ◽  
Single Spin Asymmetries ◽  
Target Experiment ◽  
Proton Proton Collisions

The inclusive large-pTproduction of a single pion, jet or direct photon, and Drell-Yan processes, are considered for proton-proton collisions in the kinematical range expected for the fixed-target experiment AFTER, proposed at LHC. For all these processes, predictions are given for the transverse single-spin asymmetry,AN, computed according to a Generalised Parton Model previously discussed in the literature and based on TMD factorisation. Comparisons with the results of a collinear twist-3 approach, recently presented, are made and discussed.

scholarly journals Transverse Single-Spin Asymmetries in Proton-Proton Collisions at the AFTER@LHC Experiment

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
K. Kanazawa ◽  
Y. Koike ◽  
A. Metz ◽  
D. Pitonyak
Keyword(s):  
Hadron Collider ◽  
Proton Proton ◽  
Spin Asymmetries ◽  
Proton Collisions ◽  
Single Spin ◽  
Single Spin Asymmetries ◽  
Direct Photon Production ◽  
Target Experiment ◽  
Analytical Formulas ◽  
Proton Proton Collisions

We present results for transverse single-spin asymmetries in proton-proton collisions at kinematics relevant for AFTER, a proposed fixed-target experiment at the Large Hadron Collider. These include predictions for pion, jet, and direct photon production from analytical formulas already available in the literature. We also discuss specific measurements that will benefit from the higher luminosity of AFTER, which could help resolve an almost 40-year puzzle of what causes transverse single-spin asymmetries in proton-proton collisions.

scholarly journals SPIN PHYSICS WITH STAR

2003 ◽  
Vol 18 (08) ◽  
pp. 1335-1342 ◽  
Author(s):  
◽  
JOANNA KIRYLUK
Keyword(s):  
Star Collaboration ◽  
Gluon Polarization ◽  
Proton Proton ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Double Spin ◽  
Single Spin Asymmetries ◽  
Polarized Proton ◽  
First Time ◽  
Proton Proton Collisions

The STAR collaboration aims to study polarized proton-proton collisions at RHIC. The emphasis of the spin run this year is on transverse single spin asymmetries. Beyond 2001, we aim to determine directly and precisely the gluon polarization, as well as the polarizations of the u, [Formula: see text], d and [Formula: see text] quarks in the proton by measuring in addition longitudinal and double spin asymmetries. Furthermore, we aim to measure for the first time the quark transversity distributions. These measurements will improve substantially the knowledge and understanding of the spin structure of the nucleon.

scholarly journals Transverse spin observables in hard-scattering hadronic processes within collinear factorization

2016 ◽  
Vol 31 (32) ◽  
pp. 1630049 ◽  
Author(s):  
Daniel Pitonyak
Keyword(s):  
Transverse Spin ◽  
Final States ◽  
Collinear Factorization ◽  
Future Directions ◽  
Proton Proton ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Double Spin ◽  
Single Spin Asymmetries ◽  
Transverse Spin Structure

We review what is currently known about the transverse spin structure of hadrons, in particular from observables that can be analyzed within a collinear framework. These effects have been around for 40 years and represent a critical test of perturbative QCD. We look at both proton–proton and lepton–nucleon collisions for various final states. While the main focus is on transverse single-spin asymmetries, we also discuss how longitudinal-transverse double-spin asymmetries offer a complimentary, yet equally important, source of information on the quark–gluon content of hadrons. We also summarize some recent progress in solidifying the theoretical formalism behind these observables and give an outlook on future directions of research.

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