Centrality and pseudorapidity dependence of the transverse energy density inpPbcollisions atsNN=5.02TeV Academic Article uri icon

abstract

  • 2019 CERN. The almost hermetic coverage of the CMS detector is used to measure the distribution of transverse energy, E, over 13.2 units of pseudorapidity for pPb collisions at a center-of-mass energy per nucleon pair of sNN=5.02 TeV. The huge angular acceptance exploits the fact that the CASTOR calorimeter at -6.6 < < -5.2 is effectively present on both sides of the colliding system because of a switch in the proton-going and lead-goingbeam directions. This wide acceptance enables the study of correlations between well-separated angular regionsand makes the measurement a particularly powerful test of event generators. For minimum biaspPb collisionsthe maximum value of dE/d is 22 GeV, which implies an E per participant nucleon pair comparable to thatof peripheral PbPb collisions at sNN=2.76 TeV. The increase of dE/d with centrality is much stronger forthe lead-going side than for the proton-going side. The dependence of dE/d is sensitive to the range inwhich the centrality variable is defined. Several modern generators are compared to these results but none isable to capture all aspects of the and centrality dependence of the data and the correlations observed between different regions.

published proceedings

  • Physical Review C

author list (cited authors)

  • Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., ... Woods, N.

publication date

  • January 1, 2019 11:11 AM