Constraints on jet quenching in p–Pb collisions at √sNN = 5.02 TeV measured by the event-activity dependence of semi-inclusive hadron-jet distributions
Özet
The ALICE Collaboration reports the measurement of semi-inclusive distributions of charged-particle jets
recoiling from a high-transverse momentum trigger hadron in p–Pb collisions at √sNN = 5.02 TeV. Jets are
reconstructed from charged-particle tracks using the anti-kT algorithm with resolution parameter R = 0.2
and 0.4. A data-driven statistical approach is used to correct the uncorrelated background jet yield. Recoil
jet distributions are reported for jet transverse momentum 15 < pch < 50 GeV/c and are compared in T,jet
various intervals of p–Pb event activity, based on charged-particle multiplicity and zero-degree neutral
energy in the forward (Pb-going) direction. The semi-inclusive observable is self-normalized and such
comparisons do not require the interpretation of p–Pb event activity in terms of collision geometry, in
contrast to inclusive jet observables. These measurements provide new constraints on the magnitude
of jet quenching in small systems at the LHC. In p–Pb collisions with high event activity, the average
medium-induced out-of-cone energy transport for jets with R = 0.4 and 15 < pch < 50 GeV/c is T,jet
measured to be less than 0.4 GeV/c at 90% confidence, which is over an order of magnitude smaller than a similar measurement for central Pb–Pb collisions at √sNN =2.76TeV. Comparison is made to theoretical calculations of jet quenching in small systems, and to inclusive jet measurements in p–Pb collisions selected by event activity at the LHC and in d–Au collisions at RHIC.
Koleksiyonlar
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