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Measurement of beauty and charm production in pp collisions at $$ \sqrt{s} $$ = 5.02 TeV via non-prompt and prompt D mesonsстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 марта 2022 г.
- Авторы: ALICE C., Malinina L.
- Журнал: Journal of High Energy Physics
- Том: 2021
- Номер: 5
- Год издания: 2021
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 220
- DOI: 10.1007/jhep05(2021)220
- Аннотация: The pT_{T}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 s \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^{−1}−1. D mesons were reconstructed from their decays D0^{0}0→ K−^{−}−π+^{+}+, D+^{+}+→ K−^{−}−π+^{+}+π+^{+}+, and {\mathrm{D}}_{\mathrm{s}}^{+}\to \upphi {\uppi}^{+}\to {\mathrm{K}}^{-}{\mathrm{K}}^{+}{\uppi}^{+} and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+^{+}+ and Ds+ {\mathrm{D}}_{\mathrm{s}}^{+} Ds+ mesons have an extended pT_{T}T coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on pT_{T}T, allowing for a more precise determination of their pT_{T}T-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_{s}s/(fu_{u}u + fd_{d}d), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The bb‾ \mathrm{b}\overline{\mathrm{b}} 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)−2.9+4.7(tot.syst) \mathrm{d}{\sigma}_{\mathrm{b}\overline{\mathrm{b}}}/\mathrm{d}y\left|{}_{\left|\mathrm{y}\right|<0.5}=34.5\pm 2.4{\left(\mathrm{stat}\right)}_{-2.9}^{+4.7}\left(\mathrm{tot}.\mathrm{syst}\right)\right. dσbb/dy∣∣∣y∣<0.5=34.5±2.4(stat)−2.9+4.7(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.[graphic not available: see fulltext]
- Добавил в систему: Малинина Людмила Владимировна