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Sivers effect in inelastic J/ψ photoproduction in ep↑ collision in color octet model

Authors :
Sangem Rajesh
Asmita Mukherjee
Raj Kishore
Source :
Physical Review D. 98
Publication Year :
2018
Publisher :
American Physical Society (APS), 2018.

Abstract

The prediction of single-spin asymmetry in inelastic photoproduction of $J/\ensuremath{\psi}$ in $e{p}^{\ensuremath{\uparrow}}$ collision is presented. At next-to-leading order, the dominating process is photon-gluon fusion, $\ensuremath{\gamma}+g\ensuremath{\rightarrow}J/\ensuremath{\psi}+g$ for the production of $J/\ensuremath{\psi}$ in $e+{p}^{\ensuremath{\uparrow}}\ensuremath{\rightarrow}J/\ensuremath{\psi}+X$, which directly probes the gluon Sivers function. Using the nonrelativistic QCD based color octet model, the color octet states ${^{3}S}_{1}^{(8)}$, ${^{1}S}_{0}^{(8)}$ and ${^{3}P}_{J(0,1,2)}^{(8)}$ contribution to $J/\ensuremath{\psi}$ production is calculated. Sizable asymmetry is estimated as a function of transverse momentum ${P}_{T}$ and energy fraction $z$ of $J/\ensuremath{\psi}$ in the range $0l{P}_{T}\ensuremath{\le}1\text{ }\text{ }\mathrm{GeV}$ and $0.3lz\ensuremath{\le}0.9$. The unpolarized differential cross section of inelastic $J/\ensuremath{\psi}$ photoproduction is found to be in good agreement with H1 and ZEUS data.

Details

ISSN :
24700029 and 24700010
Volume :
98
Database :
OpenAIRE
Journal :
Physical Review D
Accession number :
edsair.doi...........2aa5ada2d2bece303fe3b306bea2e55c
Full Text :
https://doi.org/10.1103/physrevd.98.014007