Measurement of transverse momentum flow relative to the dijet system in PbPb and pp collisions at sqrt(sNN) = 2.76 TeV

Collaboration
2014
20 pages
Report number:
  • CMS-PAS-HIN-14-010
Experiments:

Citations per year

20142016201820202020024681012
Abstract:
An analysis of the momentum flow in PbPb and pp collisions containing high momentum jets is performed in order to understand the energy loss of partons traveling in a hot and dense medium. The analysis uses data sets for PbPb and pp collisions with integrated luminosities of 150μb1\mu\rm{b}^{-1} and 5.3pb1\rm{pb}^{-1}, respectively, collected in 2011 and 2013 at collision energies of sNN=2.76\sqrt{s_{\rm{NN}}} = 2.76 TeV. For both systems, dijet events were selected containing a leading jet with transverse momentum pT,1>120p_{\rm T,1}>120 GeV/c and a subleading jet with pT,2>50p_{\rm T,2}>50 GeV/c, reconstructed with the anti-kTk_T algorithm with distance parameter R=0.3R=0.3. For PbPb collisions, there is an increase in the fraction of dijet events with large momentum asymmetry between the leading and subleading jets compared to what is seen in pp collisions. The radiation balancing this asymmetry is characterized in terms of the multiplicity, angular and momentum spectra of charged particles with pT>0.5p_{\mathrm{T}}>0.5 GeV/c. The measurement is done as a function of PbPb collision centrality, dijet asymmetry and dijet momentum difference.
Note:
  • Preliminary results
  • Data
  • p p: scattering
  • dijet
  • jet: transverse momentum
  • momentum: asymmetry
  • momentum: flow
  • momentum: difference
  • momentum: high
  • charged particle: momentum spectrum
  • parton: energy loss
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