CMS-PAS-HIN-19-007

CMS-PAS-HIN-19-007
Fragmentation of jets containing a ${\mathrm{J}/\psi}$ meson in PbPb and pp collisions at 5 TeV
CMS Collaboration
June 2020

Abstract: Jets containing a ${\mathrm{J}/\psi}$ meson are studied in PbPb collisions at a center of mass energy of ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} =$ 5.02 TeV, using the CMS detector at the LHC. Jets are selected to be in the transverse momentum range of 30 $< {p_{\mathrm{T}}} <$ 40 GeV. The yield of ${\mathrm{J}/\psi}$ in these jets is evaluated as function of the jet fragmentation function variable $z$ , the ratio of the ${\mathrm{J}/\psi}$ ${p_{\mathrm{T}}}$ to the jet ${p_{\mathrm{T}}}$ . The nuclear modification factor is then derived by comparing the yield in PbPb to the corresponding expectation from pp data at the same collision energy. The suppression of the ${\mathrm{J}/\psi}$ yield shows a dependence on $z$ , indicating that the interaction of the ${\mathrm{J}/\psi}$ with the quark-gluon plasma formed in heavy-ion collisions depends on the fragmentation pattern of the jet that gives rise to the ${\mathrm{J}/\psi}$ meson.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here.

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