Charm production and fragmentation fractions at midrapidity in pp collisions at s = 13 TeV

A bstract Measurements of the production cross sections of prompt D 0 , D + , D *+ , D s + , Λ c + , and Ξ c + charm hadrons at midrapidity in proton-proton collisions at s = 13 TeV with the ALICE detector are presented. The D-meson cross sections as a function of transverse momentum ( p T ) are pro...

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Published in:The journal of high energy physics 2023-12, Vol.2023 (12), p.86
Main Authors: Ahuja, I., Akindinov, A., Alici, A., Altamura, A. R., Andrei, C., Barnaföldi, G. G., Barreto, L., Basu, S., Beltran, Y. A. V., Bianchi, L., Bluhme, N., Bock, F., Bodova, T., Bogdanov, A., Buckland, M. D., Burmasov, N., Camerini, P., Carabas, M., Castillo Castellanos, J., Cheshkov, C., Chochula, P., Cortese, P., Crkovská, J., David, R. M. H., De Falco, A., Deng, W., Di Bari, D., Ehlers, R. J., Fabbietti, L., Feofilov, G., Fokin, I., Fuchs, U., Gotovac, S., Grelli, A., Gunji, T., Hanley, B. G., Herrmann, S., Huhn, P., Keijdener, D. L. D., Kim, J., Kirsch, S., Klemenz, T., Konopka, P. J., Kozhuharov, V., Krüger, M., Kumaoka, T., Kumar, D., Laudi, E., Lelek, T. M., Lemmon, R. C., Lim, B., Loizides, C., Lokos, S., Luhder, J. R., Mager, M., Malik, N. M., Martínez, M. I., Mazzaschi, F., Mhlanga, S., Mihaylov, D. L., Muhuri, S., Negru, A., Nepeivoda, R., Oh, S., Otwinowski, J., Park, H., Parkkila, J. E., Patra, R. N., Paul, B., Pinsky, L., Puccio, M., Räsänen, S. S., Rath, R., Read, K. F., Reidt, F., Rodríguez Cahuantzi, M., Romanenko, G., Rubini, N., Ryabov, Y., Sahu, D., Schmidt, M. O., Schmidt, M., Scomparin, E., Sharma, A., Sharma, H., Sibiriak, Y., Smirnov, N., Stiefelmaier, S. F., Stylianidis, C. P., Szarka, I., Thakur, S., Ulukutlu, B., van Weelden, R. J. G., Vázquez Doce, O., Vazquez Rueda, O., Volpe, G., Winn, M., Wu, Y., Yalcin, S., Yin, Z.
Format: Article
Language:English
Subjects:
Baryons
Charm (particle physics)
Classical and Quantum Gravitation
Collisions
Cross-sections
Distribution functions
Elementary Particles
Fragmentation
Hadrons
High energy physics
Mesons
Particle production
Partons
Physics
Physics and Astronomy
Protons
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Regular Article - Experimental Physics
Relativity Theory
String Theory
Transverse momentum
Upper bounds
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Summary:A bstract Measurements of the production cross sections of prompt D 0 , D + , D *+ , D s + , Λ c + , and Ξ c + charm hadrons at midrapidity in proton-proton collisions at s = 13 TeV with the ALICE detector are presented. The D-meson cross sections as a function of transverse momentum ( p T ) are provided with improved precision and granularity. The ratios of p T -differential meson production cross sections based on this publication and on measurements at different rapidity and collision energy provide a constraint on gluon parton distribution functions at low values of Bjorken- x (10 − 5 –10 − 4 ). The measurements of Λ c + ( Ξ c + ) baryon production extend the measured p T intervals down to p T = 0(3) GeV /c . These measurements are used to determine the charm-quark fragmentation fractions and the c c ¯ production cross section at midrapidity (| y | < 0 . 5) based on the sum of the cross sections of the weakly-decaying ground-state charm hadrons D 0 , D + , D s + , Λ c + , Ξ c 0 and, for the first time, Ξ c + , and of the strongly-decaying J /ψ mesons. The first measurements of Ξ c + and Σ c 0 , + + fragmentation fractions at midrapidity are also reported. A significantly larger fraction of charm quarks hadronising to baryons is found compared to e + e − and ep collisions. The c c ¯ production cross section at midrapidity is found to be at the upper bound of state-of-the-art perturbative QCD calculations.
ISSN:1029-8479
DOI:10.1007/JHEP12(2023)086