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

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20
Citations

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33

초록

Measurements of the production cross sections of prompt D-0, D+, D*(+), D-s(+), Lambda(+)(c), and Xi(+)(c) charm hadrons at midrapidity in proton-proton collisions at root 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 Lambda(+)(c) (Xi(+)(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) over bar 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(+), Lambda(+)(c), Xi(0)(c) and, for the first time, Xi(+)(c), and of the strongly-decaying J/psi mesons. The first measurements of Xi(+)(c) and Sigma(0,++)(c) 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) over bar production cross section at midrapidity is found to be at the upper bound of state-of-the-art perturbative QCD calculations.

키워드

Hadron-Hadron ScatteringHeavy Quark ProductionQCD
제목
Charm production and fragmentation fractions at midrapidity in pp collisions at √s=13 TeV
저자
Acharya, S.Adamova, D.Rinella, G. AglieriAgnello, M.Agrawal, N.Ahammed, Z.Ahmad, S.Ahn, S. U.Ahuja, I.Akindinov, A.Al-Turany, M.Aleksandrov, D.Alessandro, B.Alfanda, H. M.Alfaro Molina, R.Ali, B.Alici, A.Alizadehvandchali, N.Alkin, A.Alme, J.Alocco, G.Alt, T.Altamura, A. R.Altsybeev, I.Anaam, M. N.Andrei, C.Andreou, N.Andronic, A.Anguelov, V.Antinori, F.Antonioli, P.Apadula, N.Aphecetche, L.Appelshaeuser, H.Arata, C.Arcelli, S.Aresti, M.Arnaldi, R.Arneiro, J. G. M. C. A.Arsene, I. C.Arslandok, M.Augustinus, A.Averbeck, R.Azmi, M. D.Baba, H.Badala, A.Bae, J.Baek, Y. W.Bai, X.Bailhache, R.Bailung, Y.Bala, R.Balbino, A.Baldisseri, A.Balis, B.Banerjee, D.Banoo, Z.Barbera, R.Barile, F.Barioglio, L.Barlou, M.Barman, B.Barnafoeldi, G. G.Barnby, L. S.Barret, V.Barreto, L.Bartels, C.Barth, K.Bartsch, E.Bastid, N.Basu, S.Batigne, G.Battistini, D.Batyunya, B.Bauri, D.Bazo Alba, J. L.Bearden, I. G.Beattie, C.Becht, P.Behera, D.Belikov, I.Bell Hechavarria, A. D. 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DOI
10.1007/JHEP12(2023)086
발행일
2023-12
유형
Article
저널명
Journal of High Energy Physics
12