Measurement of beauty and charm production in pp collisions at $$\sqrt{s}$$ = 5.02 TeV via non-prompt and prompt D mesons
A bstract The p T -differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity ( | y | < 0 . 5) in proton-proton collisions at $$\sqrt{s}$$ s = 5 . 02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19 . 3 ± 0 . 4) nb − 1 . D mesons were reconstructed from their decays D 0 → K − π + , D + → K − π + π + , and $${\mathrm{D}}_{\mathrm{s}}^{+}\to \upphi {\uppi}^{+}\to {\mathrm{K}}^{-}{\mathrm{K}}^{+}{\uppi}^{+}$$ D s + → ϕ π + → K − K + π + and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D + and $${\mathrm{D}}_{\mathrm{s}}^{+}$$ D s + mesons have an extended p T coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on p T , allowing for a more precise determination of their p T -integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons more »
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Publication Date:
NSF-PAR ID:
10276030
Journal Name:
Journal of High Energy Physics
Volume:
2021
Issue:
5
ISSN:
1029-8479
1. A bstract The transverse momentum ( p T ) differential cross section of the charm-strange baryon $${\Xi}_{\mathrm{c}}^0$$ Ξ c 0 is measured at midrapidity (| y | < 0.5) via its semileptonic decay into e + Ξ − ν e in pp collisions at $$\sqrt{s}$$ s = 5 . 02 TeV with the ALICE detector at the LHC. The ratio of the p T -differential $${\Xi}_{\mathrm{c}}^0$$ Ξ c 0 -baryon and D 0 -meson production cross sections is also reported. The measurements are compared with simulations with different tunes of the PYTHIA 8 eventmore »
2. A bstract A measurement of inclusive, prompt, and non-prompt J/ ψ production in p-Pb collisions at a nucleon-nucleon centre-of-mass energy $$\sqrt{s_{\mathrm{NN}}}$$ s NN = 5 . 02 TeV is presented. The inclusive J/ ψ mesons are reconstructed in the dielectron decay channel at midrapidity down to a transverse momentum p T = 0. The inclusive J/ ψ nuclear modification factor R pPb is calculated by comparing the new results in p-Pb collisions to a recently measured proton-proton reference at the same centre-of-mass energy. Non-prompt J/ ψ mesons, which originate from the decay of beauty hadrons, are separated frommore »
3. Abstract We report on the inclusive $$\text {J}/\psi$$ J / ψ production cross section measured at the CERN Large Hadron Collider in proton–proton collisions at a center-of-mass energy $$\sqrt{s}~=~13$$ s = 13  TeV. The $$\text {J}/\psi$$ J / ψ mesons are reconstructed in the $$\text {e}^{+}\text {e}^{-}$$ e + e - decay channel and the measurements are performed at midrapidity ( $$|y|<0.9$$ | y | < 0.9 ) in the transverse-momentum interval $$0more » 4. A bstract The production cross-sections of J/ψ mesons in proton-proton collisions at a centre-of-mass energy of$$ \sqrt{s} $$s = 5 TeV are measured using a data sample corresponding to an integrated luminosity of 9 . 13 ± 0 . 18 pb − 1 , collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, p T , and rapidity, y , and separately for J/ψ mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised J/ψ mesons, the production cross-sections integrated over the kinematic range 0 < pmore » 5. Abstract The production of$$\phi $$ϕ mesons has been studied in pp collisions at LHC energies with the ALICE detector via the dimuon decay channel in the rapidity region$$2.5< y < 4$$2.5 < y < 4 . Measurements of the differential cross section$$\mathrm{d}^2\sigma /\mathrm{d}y \mathrm{d}p_{\mathrm {T}}$$d 2 σ / d y d p T are presented as a function of the transverse momentum ($$p_{\mathrm {T}}$$p T ) at the center-of-mass energies$$\sqrt{s}=5.02$$s = 5.02 , 8 and 13 TeV and compared with the ALICE results at midrapidity. The differential cross sections at$$\sqrt{s}=5.02more »