Acharya S., Adamová D., Adler A., Adolfsson J., Aglieri Rinella G., Agnello M., ...Daha Fazla
JOURNAL OF HIGH ENERGY PHYSICS, sa.5, 2021 (SCI-Expanded, Scopus)
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Yayın Türü:
Makale / Tam Makale
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Basım Tarihi:
2021
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Doi Numarası:
10.1007/jhep05(2021)220
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Dergi Adı:
JOURNAL OF HIGH ENERGY PHYSICS
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Derginin Tarandığı İndeksler:
Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, INSPEC, zbMATH, Directory of Open Access Journals
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Anahtar Kelimeler:
Heavy Ion Experiments
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Yıldız Teknik Üniversitesi Adresli:
Hayır
Özet
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 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-pi (+), D+-> K-pi (+)pi (+), and Ds+-> phi pi+-> K-K+pi+ and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ and Ds+ 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 divided by the one to non-strange mesons, f(s)/(f(u) + f(d)), 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 dsigma bb/dyy<0.5=34.5 +/- 2.4stat-2.9+4.7tot.syst mu b. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre- dicted by perturbative QCD calculations.