Abstract
The production of charmonia in the antiproton-nucleus reactions at plab = 3 − 10 GeV/c is studied within the Glauber model and the generalized eikonal approximation. The main reaction channel is charmonium formation in an antiproton-proton collision. The target mass dependence of the charmonium transparency ratio allows to determine the charmonium-nucleon cross section. The polarization effects in the production of χc2 states are evaluated.
Highlights
Investigation of charmonium-nucleon interactions is important for several reasons: (i) Interpretation of J/ψ suppression in relativistic heavy-ion collisions and separation of the charmonium dissociation mechanism in a quark-gluon plasma from cold nuclear matter effects. (ii) Constraining the QCDinspired models of charmonia. (iii) Growing understanding of nonperturbative vs perturbative QCD aspects, such as factorization theorem, color dipole cross section, color transparency phenomenon.Charmonium formation pp → R (R = J/ψ, ψ, χc, . . .) on a nuclear target proton has been proposed long ago [1, 2] to address the genuine charmonium-nucleon cross section, since the charmonium formation length is short in this case
Charmonium production cross section in antiproton-nucleus interaction is calculated as σpA→R(A−1)∗ = v−p 1
The effective charmonium-nucleon cross section is chosen as σeRffN(pR, z) = σRN(pR)κ(z), where σRN(pR) is the total interaction cross section of the entirely formed charmonium with a nucleon; κ(z) is the charmonium position dependent function, κ(z) < 1 for z < lR and κ(z) = 1 for z ≥ lR, which takes into account the charmonium formation length lR according to the color diffusion model [2]
Summary
. .) on a nuclear target proton has been proposed long ago [1, 2] to address the genuine charmonium-nucleon cross section, since the charmonium formation length is short in this case. Charmonium production cross section in antiproton-nucleus interaction is calculated as σpA→R(A−1)∗ = v−p 1 Is the charmonium formation cross section; vpp = s(s/4 − m2N)/Ep Ep is the pp relative velocity.
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