Measurement of the production of charm jets tagged with D${}^0$ mesons in pp collisions at $\sqrt{s}$= 7 TeV

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 $6.23$ ${\mathrm{nb}}^{-1}$, collected using a minimum-bias trigger. Charm jets are identified by the presence of a D${}^0$ meson among their constituents. The D${}^0$ mesons are reconstructed from their hadronic decay D${}^0\to$K${}^{-}{\pi }^{+}$. The D${}^0$-meson tagged jets are reconstructed using tracks of charged particles (track-based jets) with the anti-$k_{\mathrm{T}}$ algorithm in the jet transverse momentum range $5<p_{\mathrm{T},\mathrm{jet}}^{\mathrm{ch}}<30$ $GeV/c$ and pseudorapidity $|{\eta }_{\mathrm{jet}}|<0.5$. The fraction of charged jets containing a D${}^0$-meson increases with $p_{\mathrm{T},\mathrm{jet}}^{\mathrm{ch}}$ from $0.042\pm 0.004(\mathrm{stat})\pm 0.006(\mathrm{syst})$ to $0.080\pm 0.009(\mathrm{stat})\pm 0.008(\mathrm{syst})$. The distribution of D${}^0$-meson tagged jets as a function of the jet momentum fraction carried by the D${}^0$ meson in the direction of the jet axis ($z_{||}^{\mathrm{ch}}$) 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 $0.2<z_{||}^{\mathrm{ch}}<1.0$ and $0.4<z_{||}^{\mathrm{ch}}<1.0$, 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.

29 pages, 8 captioned figures, 3 tables, authors from page 24, published version, figures at http://alice-publications.web.cern.ch/node/5255

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