scholarly journals Spin asymmetry in γe ↑→e+2 jets: A laboratory for final state interactions

1984 ◽  
Vol 25 (1) ◽  
pp. 49-54
Author(s):  
Jacques Layssac ◽  
Bernard Pire ◽  
John P. Ralston
Keyword(s):  
Spin Asymmetry ◽  
Final State ◽  
Final State Interactions

scholarly journals Study of the hyperon-nucleon interaction via final-state interactions in exclusive reactions

2020 ◽  
Author(s):  
Nicholas Zachariou ◽  
Daniel Watts ◽  
Yordanka Ilieva
Keyword(s):  
Spin Asymmetry ◽  
Thomas Jefferson ◽  
Large Set ◽  
Nuclear System ◽  
Nucleon Interaction ◽  
Final State ◽  
Novel Approach ◽  
Final State Interactions ◽  
Beam Spin Asymmetry

A novel approach that allows access to long-sought information on the Hyperon-Nucleon (YN) interaction was developed by producing a hyperon beam within a few-body nuclear system, and studying final-state interactions. The determination of polarisation observables, and specifically the beam spin asymmetry, in exclusive reactions allows a detailed study of the various final-state interactions and provides us with the tools needed to isolate kinematic regimes where the YN interaction dominates. High-statistics data collected using the CLAS detector housed in Hall-B of the Thomas Jefferson laboratory allows us to obtain a large set of polarisation observables and place stringent constraints on the underlying dynamics of the YN interaction.

PROCESS DEPENDENCE AND THE SIVERS EFFECT IN INCLUSIVE AND SEMI-INCLUSIVE REACTIONS

2014 ◽  
Vol 25 ◽  
pp. 1460018
Author(s):  
LEONARD GAMBERG ◽  
ZHONG-BO KANG ◽  
ALEXEI PROKUDIN
Keyword(s):  
Experimental Data ◽  
Spin Asymmetry ◽  
Initial State ◽  
Final State ◽  
Proton Proton ◽  
Proton Collisions ◽  
Asymmetry Data ◽  
Final State Interactions ◽  
Inclusive Jet Production ◽  
Proton Proton Collisions

We perform an analysis of the the spin asymmetry for single inclusive jet production in proton-proton collisions collected by AnDY experiment and the Sivers asymmetry data from semi-inclusive deep inelastic scattering experiments. In particular, we consider the role color gauge invariance plays in determining the process-dependence of the Sivers effect. We find that after carefully taking into account the initial-state and final-state interactions between the active parton and the remnant of the polarized hadron, the calculated jet spin asymmetry based on the Sivers functions extracted from HERMES and COMPASS experiments is consistent with the AnDY experimental data. This provides a first indication for the process-dependence of the Sivers effect in different processes. We also make predictions for both direct photon and Drell-Yan spin asymmetry, to further test the process-dependence of the Sivers effect in future experiments.

scholarly journals FINAL-STATE INTERACTIONS AND SINGLE-SPIN ASYMMETRIES IN SEMI-INCLUSIVE DEEP INELASTIC SCATTERING

2003 ◽  
Vol 18 (08) ◽  
pp. 1327-1334 ◽  
Author(s):  
STANLEY J. BRODSKY ◽  
DAE SUNG HWANG ◽  
IVAN SCHMIDT
Keyword(s):  
Spin Asymmetry ◽  
Proton Spin ◽  
Final State ◽  
Complex Phase ◽  
Target Nucleon ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Polarized Target ◽  
Single Spin Asymmetries ◽  
Final State Interactions

Recent measurements from the HERMES and SMC collaborations show a remarkably large azimuthal single-spin asymmetries AUL and AUT of the proton in semi-inclusive pion leptoproduction γ*(q) p → π X. We show that final-state interactions from gluon exchange between the outgoing quark and the target spectator system leads to single-spin asymmetries in deep inelastic lepton-proton scattering at leading twist in perturbative QCD; i.e., the rescattering corrections are not power-law suppressed at large photon virtuality q2 at fixed xbj. The existence of such single-spin asymmetries requires a phase difference between two amplitudes coupling the proton target with [Formula: see text] to the same final-state, the same amplitudes which are necessary to produce a nonzero proton anomalous magnetic moment. We show that the exchange of gauge particles between the outgoing quark and the proton spectators produces a Coulomb-like complex phase which depends on the angular momentum Lz of the proton's constituents and thus is distinct for different proton spin amplitudes. The single-spin asymmetry which arises from such final-state interactions does not factorize into a product of structure function and fragmentation function, and it is not related to the transversity distribution δq(x,Q) which correlates transversely polarized quarks with the spin of the transversely polarized target nucleon.

Final-state interactions and quasi-free scattering in the 2H(α, pα)n reaction

1974 ◽  
Vol 222 (3) ◽  
pp. 429-444 ◽  
Author(s):  
T. Rausch ◽  
H. Zell ◽  
D. Wallenwein ◽  
W. Von Witsch
Keyword(s):  
Final State ◽  
Final State Interactions

scholarly journals Final state interactions in WW production

1998 ◽  
Vol 421 (1-4) ◽  
pp. 341-348 ◽  
Author(s):  
A. Donnachie ◽  
P.V. Landshoff
Keyword(s):  
Final State ◽  
Final State Interactions
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