Measurement of the inclusive differential jet cross section in pp collisions at $\sqrt{s}=2.76$ TeV

ALICE Collaboration

The ALICE collaboration at the CERN Large Hadron Collider reports the first measurement of the inclusive differential jet cross section at mid-rapidity in pp collisions at $\sqrt{s}=2.76$ TeV, with integrated luminosity of 13.6/nb. Jets are measured over the transverse momentum range 20 to 125 GeV/c and are corrected to the particle level. Calculations based on Next-to-Leading Order perturbative QCD are in good agreement with the measurements. The ratio of inclusive jet cross sections for jet radii $R=0.2$ and $R=0.4$ is reported, and is also well reproduced by a Next-to-Leading Order perturbative QCD calculation when hadronization effects are included.

Figures

Figure 1

Jet neutral energy fraction (NEF) distributions for MB data (open squares), EMCal-triggered data (filled circles) and simulations (histograms), in four different $p_{\rm T,jet}^{\rm uncorr}$ intervals.
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Figure 2

Simulated detector response to jets. Upper panels: probability distribution of $\left(p_{\rm T,jet}^{\rm detector}-p_{\rm T,jet}^{\rm part}\right)/p_{\rm T,jet}^{\rm part}$, in intervals of $p_{\rm T,jet}^{\rm part}$. Lower left: mean and median of distribution as a function of $p_{\rm T,jet}^{\rm part}$. Lower right: standard deviation of distribution as a function of $p_{\rm T,jet}^{\rm part}$. The statistical errors are smaller than the marker size.
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Figure 3

Upper panels: inclusive differential jet cross sections for $R=0.2$ and $R=0.4$. Vertical bars show the statistical error, while boxes show the systematic uncertainty. The bands show the NLO pQCD calculations discussed in the text. Lower panels: ratio of NLO pQCD calculations to data. Data points are placed at the center of each bin.
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Figure 4

Ratio of inclusive differential jet cross sections for $R=0.2$ and $R=0.4$, with pQCD calculations. Data points are placed at the center of each bin.
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