Abstract
The production of the charm-strange baryon Ξc0 is measured for the first time at the LHC via its semileptonic decay into eΞ−+νe in pp collisions at s=7 TeV with the ALICE detector. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 1<pT<8 GeV/c at mid-rapidity, |y|<0.5. The transverse momentum dependence of the Ξc0 baryon production relative to the D0 meson production is compared to predictions of event generators with various tunes of the hadronisation mechanism, which are found to underestimate the measured cross-section ratio.
Highlights
The systematic uncertainties arising from the reconstruction and selection efficiencies are estimated by repeating the analysis with different selection criteria for electrons, − and e+ − pairs and by comparing the corrected yields
A systematic uncertainty of 3% is assigned due to the imperfect knowledge of the distributions used as input for the efficiency calculation and the unfolding procedure from the simulation
It is estimated from the difference induced in the result by adding an additional step in the iterative procedure described above to obtain the input pT distributions
Summary
Article history: Received 15 December 2017 Received in revised form 5 March 2018 Accepted 21 March 2018 Available online 27 March 2018 Editor: L. Quantum Chromodynamics (QCD) as the theory of the strong interaction has been a cornerstone of the Standard Model for several decades It has been tested through measurements in e+e−, pp, pp and ep collisions at momentum-transfer scales where perturbative techniques are applicable [1]. The measurements of charmbaryon production in pp collisions serve as a reference for heavy-ion collisions, where a modification of the baryon-to-meson ratio is expected if a substantial fraction of charm quarks hadronises via recombination with other quarks from the deconfined medium created in the collision [29,30,31,32,33]. We report the first measurement of the pT-differential production cross section of 0 c multiplied by the branching ratio (BR) into the semileptonic decay mode,. A more complete and detailed description of the ALICE detector and its performance can be found in Refs. [35,36]
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