Adependence ofJ/ψ and ψ’ production at 800 GeV/c

Abstract

The yield of J/y/ and y/' vector-meson states has been measured for 800-GeV protons incident on deuterium, carbon, calcium, iron, and tungsten targets. A depletion of the yield per nucleon from heavy nuclei is observed for both J/y/ and y/ production. This depletion exhibits a strong dependence on XF and p t . Within experimental errors the depletion is the same for the J/y/ and y/\ PACS numbers: 13.85.Ni, 25.40.Ve

Revisiting scaling properties of medium-induced gluon radiation

“…The comparison of NA3 [7], E772/ E866 [8,10], as well as PHENIX [15] measurements made it possible to rule out a scaling of J=c suppression in the target parton momentum fraction x 2 , indicating a violation of factorization in charm hadroproduction [16]. This observation consequently ruled out the nuclear modifications of parton densities in the target as being a dominant effect.…”

“…The suppression of J=c production in hadron-nucleus collisions at large x F has been observed by several experiments, at different collision energies ffiffiffiffiffiffiffi s hA p ' 20-40 GeV=nucleon and in various nuclear targets [7][8][9][10]. Remarkably, its magnitude is similar to that of open charm measured by E866/NuSea through single muon production [11], as well as that of light hadrons measured by NA49 [12] at SPS and BRAHMS [13] at RHIC; in contrast, it proved much stronger than observed in the DY channel [14] as shown in Fig.…”

Universality in the Nuclear Dependence Coefficientα(qT)

“…(11) can depend on x F , α J/ψ (q T ) can also be a function of x F . Experiments show that the larger x F , the more suppression for J/ψ production (or smaller R A J/ψ ) [23]. Consequently, from Eq.…”

J/ψproduction at lowpTin Au + Au and Cu + Cu collisions atsNNAdamczyk1, Adkins2, Agakishiev3 et al. 2014Phys. Rev. C693420View full textAdd to dashboardCite

“…To disentangle all of these effects a quantitative understanding of J /ψ production in p + p, p + A, and A + A is required. The suppression owing to CNM effects has been intensively studied experimentally at Fermilab [23][24][25], SPS [26][27][28], and RHIC [29][30][31] and a few significant effects were established (for instance, an energy dependence of nuclear absorption and a large suppression of ψ in central d + Au collisions at RHIC [30]). However, a comprehensive understanding of the CNM effects is still missing.…”