Abstract
Measurements of high pT processes in ultrarelativistic proton-nucleus collisions are sensitive to changes in the partonic densities arising from the presence of the nuclear environment. Additionally, such measurements benchmark the so called “cold nuclear matter” effects and provide the reference for understanding the large suppression of high-pT processes observed in nucleus-nucleus collisions. Furthermore, measurements of the centrality dependence of jet production at forward (proton-going) rapidities may shed light on the behavior of the proton wavefunction at large Bjorken-x. The latest ATLAS results for inclusive jets and charged particles in 28.9 nb-1 of 5.02 TeV proton-lead collisions at the LHC are presented. The centrality in these collisions is characterized through the sum of the total transverse energy in the lead-going forward calorimeter. The nuclear modification factors RpPb and RCP are presented as a function of transverse momentum, rapidity and centrality. The jet RCP in a large rapidity region is found to be modified in a way that depends only on the total jet energy.
Highlights
Measurements of high transverse momentum processes of proton–lead (p+Pb) collisions probe the partonic structure of the nucleus and its possible modification [1], and provide constraints on how initial state effects may influence the observed suppression of these processes in lead–lead collisions
Inclusive jet and charged hadron measurements in sNN = 5.02 TeV p+Pb collisions by the ATLAS detector [3] at the LHC are presented as a function of jet or hadron pT and center of mass rapidity, y∗
Modifications to inclusive jet or hadron production rates were investigated through the nuclear modification factor RpPb = (1/Nevt)(d2N/dpTdy∗)/(TpAd2σ/dpTdy∗), where the numerator is the per-event jet or hadron yield, TpA is the mean nuclear thickness seen by the proton in events of the given centrality in√terval and d2σ/dpTdy∗ is the jet or hadron cross-section in pp collisions evaluated at the same s
Summary
Measurements of high transverse momentum (pT) processes of proton–lead (p+Pb) collisions probe the partonic structure of the nucleus and its possible modification [1], and provide constraints on how initial state effects may influence the observed suppression of these processes in lead–lead collisions. Inclusive jet and charged hadron measurements in sNN = 5.02 TeV p+Pb collisions by the ATLAS detector [3] at the LHC are presented as a function of jet or hadron pT and center of mass rapidity, y∗. All data sets were recorded using a combination of minimum bias and high level jet triggers.
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