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| CMS-PAS-HIN-23-007 | ||
| Pseudorapidity distributions of charged hadrons in PbPb collisions at $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}} = $ 5.36 TeV | ||
| CMS Collaboration | ||
| 18 September 2023 | ||
| Abstract: The pseudorapidity ($ \eta $) distributions of charged hadrons are measured using data collected at a record nucleon-nucleon center-of-mass energy of $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}}= $ 5.36 TeV for collisions of lead-lead (PbPb) ions. The data were recorded by the CMS experiment at the LHC in 2022 and correspond to an integrated luminosity of 0.3 $ \pm $ 0.03 $\mu$b$^{-1} $. Using the CMS silicon pixel detector, the yields of primary charged hadrons produced in the range $ |\eta| < $ 2.6 are reported. The evolution of the midrapidity particle density as a function of collision centrality is also reported. In the 5% most central collisions, the charged-hadron pseudorapidity density is found to be 2032 $ \pm $ 91 (syst) in the range $ |\eta| < $ 0.5, with negligible statistical uncertainty. This result is consistent with an extrapolation from lower energy nucleus-nucleus collision data. Comparisons are made to various Monte Carlo event generators, and to previous measurements of PbPb and xenon-xenon collisions at similar collision energies. These observations detail the dependence of midrapidity particle production on the initial collision geometry, collision energy, and system size. | ||
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Links:
CDS record (PDF) ;
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These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here.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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Compact Muon Solenoid LHC, CERN |
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