Abstract
Abstract The effects of parton energy loss and p ⊥-broadening in cold nuclear matter on the p ⊥ and centrality dependence, at various rapidities, of J/ψ suppression in p-A collisions are investigated. Calculations are systematically compared to E866 and PHENIX measurements. The very good agreement between the data and the theoretical expectations further supports p ⊥-broadening and the associated medium-induced parton energy loss as dominant effects in J/ψ suppression in high-energy p-A collisions. Predictions for J/ψ (and $ \varUpsilon $ ) suppression in p-Pb collisions at the LHC are given.
Highlights
Of the nuclear modification of particle spectra in cold nuclear matter is required
At the same time it is astonishing that no consensus on the cold nuclear matter effects responsible for J/ψ suppression has been achieved yet
Following our earlier work [19], we studied the effects of parton p⊥-broadening and energy loss in cold nuclear matter on the p⊥ dependence of J/ψ and Υ suppression in p-A colli
Summary
To ref. [19], we use for the double differential p-p cross section dσpp/dyd2p⊥ a simple parametrization consistent with the available p-p data, rather than relying on some model-dependent quarkonium production mechanism in hadronic collisions. At the LHC (√s = 7 TeV) the values of the free parameters N , p0, m and n are obtained from a global fit of ALICE [23], ATLAS [24] and LHCb [25] data on prompt J/ψ production and from a fit of LHCb data [26] on Υ production. The fit to the double differential data measured by PHENIX [27] is performed by fixing the value of n = 8.3 obtained from the fit of the single differential cross section dσpJp/ψ dy, see ref. [19] can be recovered from (2.12), along the same lines as in appendix A where the parametrization of dσpp/dy is obtained from dσpp/dyd2p⊥ Integrating both the numerator and denominator of (2.1) (and of (2.12)) over p⊥, the function ν(y, p⊥). The p⊥-inclusive suppression factor reads RpψA(y) ≃ RploAss(y, p⊥), which corresponds exactly to the quantity studied in ref. [19]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
