Quarkonia experimental results in p-A collisions

J/ψ yields in low energy nuclear collisions at SPS and FAIR: A baseline estimation

“…The corresponding measurements by NA60 experiment at the same energy were found to be fitted with an asymmetric Gaussian function imposing a mean µ y = −0.2 and σ y = 0.81±0.03 [67]. At 158 GeV, data could be described by a gaussian function centred at mid-rapidity, µ y = 0.05 ± 0.05 and a width σ y = 0.51 ± 0.02 [67] 4 .…”

“…The corresponding values of σ J/ψ abs 6 are presented in Ref. [67]. At a given collision energy, stronger nuclear effects (smaller α J/ψ or larger σ J/ψ abs ) at higher x F indicates the presence of additional absorption mechanisms at forward rapidities presumably related to energy loss and formation time effects.…”

“…Further insights on CNM effects may be obtained through the investigation of J/ψ kinematical distributions. At 400 GeV, NA50 experiment observed a constant backward shift of the acceptance corrected centre-of-mass rapidity distribution of the J/ψ mesons, ∆y ∼ 0.2 (corresponding to ∆x F ∼ 0.045), and a width σ y = 0.85, independent of the target mass [67]. The corresponding measurements by NA60 experiment at the same energy were found to be fitted with an asymmetric Gaussian function imposing a mean µ y = −0.2 and σ y = 0.81±0.03 [67].…”

“…At 400 GeV, NA50 experiment observed a constant backward shift of the acceptance corrected centre-of-mass rapidity distribution of the J/ψ mesons, ∆y ∼ 0.2 (corresponding to ∆x F ∼ 0.045), and a width σ y = 0.85, independent of the target mass [67]. The corresponding measurements by NA60 experiment at the same energy were found to be fitted with an asymmetric Gaussian function imposing a mean µ y = −0.2 and σ y = 0.81±0.03 [67]. At 158 GeV, data could be described by a gaussian function centred at mid-rapidity, µ y = 0.05 ± 0.05 and a width σ y = 0.51 ± 0.02 [67] 4 .…”

“…In Ref. [11], explicit estimations have shown that if the nuclear modification of the parton densities is ignored, the corresponding σ J/ψ abs values are independent of y cms around 4 The reference [67] is a proceeding article and they contain preliminary results. 5 Unlike the integrated cross section, the reanalyzed differential cross sections, consistent with 400 GeV measurements, were not published.…”