Analyzing power in inclusive π+ and π- production at high xF with a 200 GeV polarized proton beam

Comparison of spin asymmetries and cross sections in π0 production by 200 GeV polarized antiprotons and protons

Measurements of the production of forward jets from transversely polarized proton collisions at √s = 500 GeV conducted at the Relativistic Heavy Ion Collider (RHIC) are reported. Our measured jet cross section is consistent with hard scattering expectations. Our measured analyzing power for forward jet production is small and positive, and provides constraints on the Sivers functions that are related to partonic orbital angular momentum through theoretical models.

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Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at sqrt[s]=200 GeV.

A fixed-target programme at the LHC: Physics case and projected performances for heavy-ion, hadron, spin and astroparticle studies

The spin asymmetryAN for inclusive π0 production by 200-GeV transversely-polarized protons on a liquid hydrogen target has been measured at Fermilab over a wide range ofxF, with 0.5 0.3, the asymmetry rises with increasingxF and reaches a value ofAN=0.15±0.03 in the region 0.6<xF<0.8. This result provides new input regarding the question of the internal spin structure of transversely-polarized protons.

Large- x F spin asymmetry in π 0 production by 200-GeV polarized protons

The analyzing power ${A}_{N}$ in inclusive ${\ensuremath{\pi}}^{0}$ production has been measured with use of the new 185-GeV/c Fermilab polarized proton beam. We obtain the value ${A}_{N}=0.10\ifmmode\pm\else\textpm\fi{}0.03$ for ${\ensuremath{\pi}}^{0}'s$ in the kinematic region $0.2l{x}_{F}l0.8$ and $0.3l{p}_{T}l1.2$ GeV/c. In certain models of particle production this suggests that the spin of the proton is carried by its valence quarks.

A. H. Mohammadzadeh

Papers

Analyzing-power measurement in inclusive pi 0 production at high xF.