Wilson-line and color charge density correlators and the production of {eta}{sup '} in the color glass condensate for pp and pA collisions

Journal Article · Sun Feb 15 00:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.025204· OSTI ID:21199577

Fillion-Gourdeau, Francois; Jeon, Sangyong ^[1]

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1. Department of Physics, McGill University, 3600 University Street, Montreal, H3A 2T8 (Canada)

We compute the inclusive differential cross section production of the pseudoscalar meson {eta}{sup '} in high-energy proton-proton (pp) and proton-nucleus (pA) collisions. We use an effective coupling between gluons and {eta}{sup '} meson to derive a reduction formula that relates the {eta}{sup '} production to a field-strength tensor correlator. For pA collisions, we take into account saturation effects on the nucleus side by using the color glass condensate formalism to evaluate this correlator. We derive new results for Wilson-line color charge correlators in the McLerran-Venugopalan model needed in the computation of {eta}{sup '} production. The unintegrated parton distribution functions are used to characterize the gluon distribution inside protons. We show that in pp collisions, the cross section depends on the parametrization of unintegrated parton distribution functions, and thus it can be used to put constraints on these distributions. We also demonstrate that in pA collisions, the cross section is sensitive to saturation effects, so it can be utilized to estimate the value of the saturation scale.

• OSTI ID: 21199577
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 79, Issue 2; Other Information: DOI: 10.1103/PhysRevC.79.025204; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGE DENSITY
COLLISIONS
COLOR MODEL
CONDENSATES
COUPLING
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
DISTRIBUTION FUNCTIONS
ETA MESONS
GLASS
GLUONS
HYDROGEN IONS 1 PLUS
ION-ATOM COLLISIONS
NUCLEI
PARTICLE PRODUCTION
PROTON-PROTON INTERACTIONS
PROTONS
PSEUDOSCALAR MESONS
SATURATION
SIMULATION