Λ^+_c$ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV at the LHC

Λ^+_c$ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV at the LHC

The prompt production of the charm baryon $Λ^+_c$ and the $Λ^+_c/D^0$ production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. These new measurements show a clear decrease of the $Λ^+_c/D^0$ ratio with increasing transverse momen...

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Veröffentlicht in:Physical review letters 2021-11, Vol.127 (20)
Hauptverfasser: Alfanda, H.  M., Angeletti, M., Arslandok, M., Aziz, S., Bailhache, R., Balbino, A., Ball, M., Barret, V., Batyunya, B., Bauri, D., Beole, S., Bergmann, L., Betev, L., Biswas, S., Boca, G., Bock, F., Bysiak, S.  A., Crochet, P., Cunqueiro, L., Damas, F.  P. A., Das, I., Deb, S., Ding, Y., Dordic, O., Eikeland, V.  N., Elia, D., Erokhin, A., Fantoni, A., Figiel, J., Flores, A.  N., Foertsch, S., Gagliardi, M., Garabatos, C., Gargiulo, C., Garner, K., Giacalone, M., Graczykowski, L.  K., Grigoryan, S., Grosse-Oetringhaus, J.  F., Gunji, T., Hannigan, R., Haque, M.  R., Hayashi, S., Helstrup, H., Herman, T., Janik, M.  A., Khan, S., Kileng, B., Kim, D., Kim, E.  J., Kim, S., Knospe, A.  G., Kollegger, T., Králik, I., Kwon, Y., Lindner, A., Mager, M., Malaev, M., Marín, A., Martin, N.  A., Martinengo, P., Martínez, M.  I., Mayer, C., Mechler, A.  F., Miake, Y., Mihaylov, D.  L., Mudnic, E., Myrcha, J.  W., Nikulin, S., Nyanin, A., Ohlson, A., Panebianco, S., Park, J., Pozdniakov, V., Prino, F., Raniwala, R., Read, K.  F., Reygers, K., Rotondi, A., Rytkonen, H., Sahoo, B., Sahoo, S., Scioli, G., Siemiarczuk, T., Sorensen, S., Stocco, D., Sugitate, T., Tikhonov, A., Varga, Z., Vasiliev, A., Verweij, M., Vinogradov, A., Virgili, T., Voloshin, K., Wikne, J., Willsher, E., Wright, J.  R., Yamaguchi, Y., Yamakawa, K., Zhu, J.
Format: Artikel
Sprache:eng
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PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Zusammenfassung:The prompt production of the charm baryon $Λ^+_c$ and the $Λ^+_c/D^0$ production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. These new measurements show a clear decrease of the $Λ^+_c/D^0$ ratio with increasing transverse momentum (pT) in both collision systems in the range 2 < pT < 12 GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and $Λ/K^0_S$. At low pT, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e+e– and e–p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.
ISSN:0031-9007