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Measurement of beauty and charm production in pp collisions at √s = 5.02 TeV via non-prompt and prompt D mesons (2021)

ALICE collaboration. (2021). Measurement of beauty and charm production in pp collisions at √s = 5.02 TeV via non-prompt and prompt D mesons. Journal of High Energy Physics, 2021(5), Article 220. https://doi.org/10.1007/JHEP05(2021)220

JYU-tekijät tai -toimittajat

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: ALICE collaboration

Lehti tai sarja: Journal of High Energy Physics

ISSN: 1126-6708

eISSN: 1029-8479

Julkaisuvuosi: 2021

Volyymi: 2021

Lehden numero: 5

Artikkelinumero: 220

Kustantaja: Springer

Julkaisumaa: Saksa

Julkaisun kieli: englanti

DOI: https://doi.org/10.1007/JHEP05(2021)220

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/77090

Rinnakkaistallenteen verkko-osoite (pre-print): https://arxiv.org/abs/2102.13601


The pT-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 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 D0 → K−π+, D+ → K−π+π+, and D+s→φπ+→K−K+π+ and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ and D+s mesons have an extended pT coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on pT, allowing for a more precise determination of their pT-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, fs/(fu + fd), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The bb¯¯¯ production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is dσbb¯¯¯/dy∣∣|y|<0.5=34.5±2.4(stat)+4.7−2.9(tot.syst) μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre- dicted by perturbative QCD calculations.

YSO-asiasanat: hiukkasfysiikka

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OKM-raportointi: Kyllä

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Viimeisin päivitys 2021-12-07 klo 11:09