Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at root S-NN=8.16 TeV
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G. and Zurlo, N. and ALICE Collaboration... Show more Show less
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Abstract
The pseudorapidity density of charged particles, dN(ch)/d eta, in p-Pb
collisions has been measured at a centre of-mass energy per
nucleon-nucleon pair of root S-NN = 8.16 TeV at mid-pseudorapidity for
non-single-diffractive events. The results cover 3.6 units of
pseudorapidity, vertical bar eta vertical bar < 1.8. The dN(ch)/d eta
value is 19.1 +/- 0.7 at vertical bar eta vertical bar < 0.5. This
quantity divided by < N-part >/2 is 4.73 +/- 0.20, where < N-part > is
the average number of particcipating nucleons, is 9.5\% higher than the
corresponding value for p-Pb collisions at root S-NN = 5.02 TeV.
Measurements are compared with models based on different mechanisms for
particle production. All models agree within uncertainties with data in
the Pb-going side, while HIJING overestimates, showing a symmetric
behaviour, and EPOS underestimates the p-going side of the dN(ch)/d eta
distribution. Saturation-based models reproduce the distributions well
for eta > -1.3. The dN(ch)/d eta is also measured for different
centrality estimators, based both on the charged particle multiplicity
and on the energy deposited in the Zero Degree Calorimeters. A study of
the implications of the large multiplicity fluctuations due to the small
number of participants for systems like p-Pb in the centrality
calculation for multiplicity-based estimators is discussed,
demonstrating the advantages of determining the centrality with energy
deposited near beam rapidity.... Show more Show less