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arXiv · 1909.08572

Probing parton saturation with forward $Z^0$-boson production at small transverse momentum in p+p and p+A collisions

Cyrille Marquet·Shu-Yi Wei·Bo-Wen Xiao
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Abstract

We calculate and compare the differential cross sections for forward $Z^0$-boson production at small transverse momentum, in proton-proton and proton-nucleus collisions, using both the collinear and dilute-dense factorization frameworks. In both cases, we implement a Sudakov resummation of the large logarithms generated by soft-gluon emissions, which is essential in order to describe the transverse momentum distribution of forward $Z^0$ bosons measured at the Tevatron and the LHC. We further compute the nuclear modification factor in the dilute-dense framework, hoping to single out signals of saturation effects at small values of $x$. Our predictions are compared with those obtained in the collinear factorization framework, using two different nuclear parton distribution functions.

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Cyrille Marquet, Shu-Yi Wei, Bo-Wen Xiao. 2020-01-24. Probing parton saturation with forward $Z^0$-boson production at small transverse momentum in p+p and p+A collisions. https://doi.org/10.1016/j.physletb.2020.135253

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