Abstract
The transverse momentum (pT) differential cross section of the charm-strange baryon {Xi}_{mathrm{c}}^0 is measured at midrapidity (|y| < 0.5) via its semileptonic decay into e+Ξ−νe in pp collisions at sqrt{s} = 5.02 TeV with the ALICE detector at the LHC. The ratio of the pT-differential {Xi}_{mathrm{c}}^0 -baryon and D0-meson production cross sections is also reported. The measurements are compared with simulations with different tunes of the PYTHIA 8 event generator, with predictions from a statistical hadronisation model (SHM) with a largely augmented set of charm-baryon states beyond the current lists of the Particle Data Group, and with models including hadronisation via quark coalescence. The pT-integrated cross section of prompt {Xi}_{mathrm{c}}^0 -baryon production at midrapidity is also reported, which is used to calculate the baryon-to-meson ratio {Xi}_{mathrm{c}}^0 /D0 = 0.20 ± 0.04 {left(mathrm{stat}.right)}_{-0.07}^{+0.08} (syst.). These results provide an additional indication of a modification of the charm fragmentation from e+e− and e−p collisions to pp collisions.
Highlights
Measurements of the production cross sections of different charm-hadron species, comparing in particular baryon and meson production in various collision systems and centreof-mass energies, provide insight into the properties of the fragmentation process
In the context of the heavy-ion programme at the LHC, the cc production cross section per nucleon-nucleon collision is a fundamental ingredient for the determination of the amount of charmonium production bygeneration in a quark-gluon plasma (QGP), a mechanism that is supported by J/ψ measurements in nucleus-nucleus collisions at the LHC [39, 40]
The measured pT-differential cross section and Ξ0c/D0 ratio were compared with different tunes of the PYTHIA 8 event generator that implement different particle production and hadronisation mechanisms
Summary
The two innermost layers, equipped with Silicon Pixel Detectors (SPD), provide a space-point position resolution of 12 μm and 100 μm in the rφ and the beam direction, respectively. The TOF detector provides the measurement of the flight time of charged particles from the interaction point to the detector radius of 3.8 m, with an overall resolution of about 80 ps. The T0 detector consists of two arrays of Čerenkov counters, located on both sides of the interaction point, covering the pseudorapidity intervals −3.28 < η < −2.97 and 4.61 < η < 4.92. The V0 detector [53], composed of two arrays of 32 scintillators each, covering the pseudorapidity intervals −3.7 < η < −1.7 and 2.8 < η < 5.1, provides the minimum bias (MB) trigger used to collect the data sample.
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