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Al-Turany, M.; Alfaro Molina, R.; Alizadehvandchali, N.; Alt, T.; Arnaldi, R.; Bailhache, R.; Barlou, M.; Bartsch, E.; Baruffaldi, F.; Bastid, N.; Bercuci, A.; Bergmann, L.; Bhasin, A.; Bhattacharjee, B.; Bhattacharya, P.; Bielčíková, J.; Bok, J.; Bonomi, G.; Buthelezi, Z.; Carnesecchi, F.; Castillo Castellanos, J.; Chakraborty, P.; Ciupek, M. R.; Colella, D.; Cortese, P.; Crochet, P.; Das, S.; De Caro, A.; De Marco, N.; Dubey, A. K.; Ehlers, R. J.; Ercolessi, F.; Erokhin, A.; Fernández Téllez, A.; Ferretti, A.; Funicello, N.; Furget, C.; Giubellino, P.; Giubilato, P.; Gupta, R.; Hatzifotiadou, D.; Herrmann, F.; Ivanov, M.; Jacazio, N.; Jones, P. G.; Kalinak, P.; Kisel, I.; Klein-Bösing, C.; Kobdaj, C.; Konopka, P. J.; Kravčáková, A.; Lautner, L.; Ma, Y. G.; Malik, Q. W.; Marín, A.; Mohanty, B.; Moravcova, Z.; Moreira De Godoy, D. A.; Munhoz, M. G.; Murakami, H.; Naru, M. U.; Ohlson, A.; Oyama, K.; Pagano, D.; Peresunko, D.; Pillot, P.; Prasad, S. K.; Pruneau, C. A.; Ragoni, S.; Riegler, W.; Rogochaya, E.; Rotondi, A.; Roy, A.; Rumyantsev, B.; Sahoo, R.; Sarkar, N.; Schiaua, C.; Schmidt, C.; Schmier, A. R.; Shabetai, A.; Shimomura, M.; Singh, R.; Singhal, V.; Stocco, D.; Suaide, A. A. P.; Taillepied, G.; Takahashi, J.; Tauro, A.; Timmins, A. R.; Trogolo, S.; Vasileiou, M.; Vázquez Doce, O.; Voscek, D.; Weber, M.; Wenzel, S. C.; Yoo, I.-K.; Zaccolo, V.; Zaviyalov, N.; Zhalov, M.; Zurlo, N.
The journal of high energy physics, 05/2021, Letnik: 2021, Številka: 5Journal Article
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 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 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 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 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 b b ¯ production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is d σ b b ¯ / d y 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.
