Abstract
The production of charm jets in proton-proton collisions at a center-of-mass energy of sqrt{s}=7 TeV was measured with the ALICE detector at the CERN Large Hadron Collider. The measurement is based on a data sample corresponding to a total integrated luminosity of 6.23 nb−1, collected using a minimum-bias trigger. Charm jets are identified by the presence of a D0 meson among their constituents. The D0 mesons are reconstructed from their hadronic decay D0 →K−π+. The D0-meson tagged jets are reconstructed using tracks of charged particles (track-based jets) with the anti-kT algorithm in the jet transverse momentum range 5<{p}_{{mathrm{T}}_{,mathrm{jet}}}^{mathrm{ch}} < 30 GeV/c and pseudorapidity |ηjet| < 0.5. The fraction of charged jets containing a D0-meson increases with {p}_{{mathrm{T}}_{,mathrm{jet}}}^{mathrm{ch}} from 0.042 ± 0.004 (stat) ± 0.006 (syst) to 0.080 ± 0.009 (stat) ± 0.008 (syst). The distribution of D0-meson tagged jets as a function of the jet momentum fraction carried by the D0 meson in the direction of the jet axis left({z}_{parallel}^{mathrm{ch}}right) is reported for two ranges of jet transverse momenta, 5<{p}_{{mathrm{T}}_{,mathrm{jet}}}^{mathrm{ch}} < 15 GeV/c and 15<{p}_{{mathrm{T}}_{,mathrm{jet}}}^{mathrm{ch}} < 30 GeV/c in the intervals 0.2<{z}_{BigVert}^{mathrm{ch}}<1.0 and 0.4<{z}_{BigVert}^{mathrm{ch}}<1.0 , respectively. The data are compared with results from Monte Carlo event generators (PYTHIA 6, PYTHIA 8 and Herwig 7) and with a Next-to-Leading-Order perturbative Quantum Chromodynamics calculation, obtained with the POWHEG method and interfaced with PYTHIA 6 for the generation of the parton shower, fragmentation, hadronisation and underlying event.
Highlights
Apparatus and data sampleThe measurements presented in this paper were carried out using data recorded by the ALICE apparatus [44, 45] in 2010
Pioneering measurements of charm jets were performed at the CERN SPS [18] and at the Tevatron [19, 20]
Through a Bayesian analysis based on PYTHIA 6 templates, the PHENIX collaboration found that while leading order pair creation is dominant for bottom production, higher order processes dominate for charm one
Summary
The measurements presented in this paper were carried out using data recorded by the ALICE apparatus [44, 45] in 2010. The Inner Tracking System (ITS) and the Time-Projection Chamber (TPC) were used for charged-particle track reconstruction and the combined information from the TPC and the Time-Of-Flight (TOF) detectors was used to provide particle identification (PID). These detectors are located in the central barrel, which has a full azimuthal coverage and a pseudorapidity interval of |η| < 0.9. Events were selected offline by using the timing information from the V0 and the correlation between the number of hits and track segments in the SPD detector to remove background due to beam-gas interactions.
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