Abstract
We investigate the forward-jet energy spectrum within the Color Glass Condensate framework at 5 TeV center-of-mass energy. In particular, we focus on the kinematic range covered by the CMS-CASTOR calorimeter. We show that our saturation-model calculations are compatible with the CASTOR measurements and that to optimally reproduce the data, effects of multi-parton interactions need to be included. We predict a significant nuclear suppression - reaching down to 50% at the lowest considered jet energies $E_{\rm jet} \sim 500 \, {\rm GeV}$.
Highlights
The nonlinear phenomena of quantum chromodynamics (QCD) are expected to have a significant effect on highenergy interactions of protons and heavier nuclei [1]
The forward particle production in high-energy proton-nucleus collisions can be described using the so-called hybrid formalism, in which the dilute moderate-x probe is described in terms of collinear parton distribution functions, and the parton-target scattering is computed from the color glass condensate (CGC) taking into account multiple scattering with the target
As discussed in Appendix B, the jet-production cross section depends only weakly on the infrared cutoff in the CASTOR kinematics
Summary
The nonlinear phenomena of quantum chromodynamics (QCD) are expected to have a significant effect on highenergy interactions of protons and heavier nuclei [1]. Future electronion colliders (EICs) in the United States [17] and at CERN [18] are designed to probe the small-x structure of heavy nuclei with electron beams very precisely [19,20] Before such machines are realized, large gluon densities in nuclei can be probed studying particle production at forward rtpharpeoiddutiatcirtegisoentinnaput rcofleotourwns-ansrudccallereauspsidlciikotielelissxiowAni∼st,hea−spy=tffishffipffiNffieffiNffiffisffiffiBffiNffi1⁄4ffijNffioffi.2rk0Pe0nar-GtxieciVlne center-of-mass (c.m.) energy has been measured at the Relativistic Heavy Ion Collider (RHIC) in deuterongold collisions [21,22,23,24], and the results are compatible with. The most decisive small-x data are arguably the D- and B-meson measurements by the LHCb Collaboration [28,29] which both show that the p-Pb cross sections at y ≫ 0 are clearly suppressed with respect to the p-p baseline Out of these two the D-meson production should be the most sensitive to the nonlinear dynamics due to the low interaction scale involved.
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