J/ψ and ψ′ production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV

Abstract

We report a new measurement of J/ψ, ψ ′ and Drell-Yan cross-sections, in the kinematical domain −0.425 < y cm < 0.575 and −0.5 < cos θ CS < 0.5, performed at the CERN-SPS using 400 GeV/c incident protons on Be, Al, Cu, Ag, W and Pb targets. The dependence of the charmonia production cross-sections on the size of the target nucleus allows to quantify the so-called normal nuclear absorption. In the framework of the Glauber model, this new measurement is combined with results previously obtained with the same apparatus, under different experimental conditions, and leads to a precise determination of the J/ψ and ψ ′ absorption crosssections in the surrounding nuclear matter.

J/ψ and ψ(2S) production at forward rapidity in Acharya1, Adare2, Aidala3 et al. 2020Phys. Rev. DSelf Cite8020View full textAdd to dashboardCite

“…7. This ratio is compared with other p þ p and p þ A systems at different collision energies [17,[30][31][32][33][34][35][36][37][38]. The results are consistent with world data within uncertainties with no significant dependence on collision energy.…”

“…Comparison of world data on the ratio of ψð2sÞ to J=ψ mesons in dilepton decays[7,17,[30][31][32][33][34][35][36][37][38]. The associated uncertainties are the quadrature sum of the statistical and systematic uncertainties.…”

Transverse Momentum Distributions of Final-State Particles Produced in Soft Excitation Process in High Energy Collisions

“…Table 8: Parameter values corresponding to the curves in Figure 8. [29,30] (Figure 2(b)) and NA50 Collaborations [31] (Figure 2(d)), and the curves are our results calculated by the Boltzmann or two-component Boltzmann distributions. The values of parameters and 2 /dof are given in Table 2.…”

Parton shadowing andJ/ψ-to-Drell-Yan ratio in nuclear collisions at energies available at the CERN SPS and the GSI FAIR

“…In our previous work [8], we have shown that both the data sets on the centrality dependence of R J/ψ AA , in In + In and Pb + Pb collisions, can be reasonably described by the adapted version of the Qiu-Vary-Zhang (QVZ) approach [9]. In the present article, we aim to check the viability of our model by examining the available data corpus on J /ψ-to-DY ratios in p + A [10,11] and Pb + Pb [4] collisions measured by the NA50 Collaboration, at SPS energies. The advantage of analyzing this ratio is that the cross sections for both the processes are directly measured in the experiment.…”

“…The NA50 Collaboration measured J /ψ through its dimuon decay channel. For p + A collisions the said ratio was measured with both 400 GeV [10] and 450 GeV [11] proton beams. In the case of Pb + Pb collisions the data were collected at 158 A GeV [4].…”