In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2019, No. 8 ( 2019-08)
Abstract:
The production of charm jets in proton-proton collisions at a center-of-mass energy of $$ \sqrt{s}=7 $$ 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 D 0 meson among their constituents. The D 0 mesons are reconstructed from their hadronic decay D 0 →K − π + . The D 0 -meson tagged jets are reconstructed using tracks of charged particles (track-based jets) with the anti- k T algorithm in the jet transverse momentum range $$ 5〈{p}_{{\mathrm{T}}_{,\mathrm{jet}}}^{\mathrm{ch}} $$ 5 〈 p T , jet ch 〈 30 GeV /c and pseudorapidity | η jet | 〈 0 . 5. The fraction of charged jets containing a D 0 -meson increases with $$ {p}_{{\mathrm{T}}_{,\mathrm{jet}}}^{\mathrm{ch}} $$ p T , jet ch from 0 . 042 ± 0 . 004 (stat) ± 0 . 006 (syst) to 0 . 080 ± 0 . 009 (stat) ± 0 . 008 (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 $$ \left({z}_{\parallel}^{\mathrm{ch}}\right) $$ z ∥ ch is reported for two ranges of jet transverse momenta, $$ 5〈{p}_{{\mathrm{T}}_{,\mathrm{jet}}}^{\mathrm{ch}} $$ 5 〈 p T , jet ch 〈 15 GeV /c and $$ 15〈{p}_{{\mathrm{T}}_{,\mathrm{jet}}}^{\mathrm{ch}} $$ 15 〈 p T , jet ch 〈 30 GeV /c in the intervals $$ 0.2〈{z}_{\Big\Vert}^{\mathrm{ch}}〈1.0 $$ 0.2 〈 z ‖ ch 〈 1.0 and $$ 0.4〈{z}_{\Big\Vert}^{\mathrm{ch}}〈1.0 $$ 0.4 〈 z ‖ 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.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP08(2019)133
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2019
detail.hit.zdb_id:
2027350-2
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