Measurement of the fraction of jet longitudinal momentum carried by Λc+ baryons in pp collisions

Measurement of the fraction of jet longitudinal momentum carried by Λc+ baryons in pp collisions

Recent measurements of charm-baryon production in hadronic collisions have questioned the universality of charm-quark fragmentation across different collision systems. In this work the fragmentation of charm quarks into charm baryons is probed, by presenting the first measurement of the longitudinal...

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Hauptverfasser: Arsene, Ionut Cristian, Bai, X, Barnby, L.S, Bastid, N, Bauri, D, Biro, G, Bodova, Tea, Bond, P.M, Bruno, G.E, Buckland, M.D, Buhler, P, Bysiak, S.A, Canedo, F.D.M, Clai, G, Contin, G, Contreras, J.G, Cormier, T.M, De Martin, Martin, Deb, S, Deng, W, Dubla, A, Dupieux, P, Eisenhut, F, Ercolessi, F, Feofilov, G, Fokin, S, Furs, A, Gay Ducati, Ducati, Glaenzer, A.M.C, Guernane, R, Gunji, T, Han, Y, Harris, J.W, Harton, A, Hetland, Kristin Fanebust, Hofman, B, Huhn, P, Ivanov, V, Jacak, B, Jercic, M, Jusko, A, Kalinak, P, Karavicheva, T, Keidel, R, Kreis, L, Kučera, V, Kuhn, C, Kushpil, S, Li, X.L, Lofnes, Ingrid Mckibben, Maire, A, Manso, F, Margotti, A, Masera, M, Miake, Y, Naik, B, Nania, R, Nyanin, A, Nystrand, Joakim Ingemar, Oleniacz, J, Oliveira Da Silva, Da, Pereira, L.G, Perez, G.M, Perrin, S, Płoskoń, M, Redelbach, A.R, Riedel, A.A, Røed, Ketil, Rogochaya, E, Rojas Torres, Torres, Rosano, A, Roslon, K, Rumyantsev, B, Rustamov, A, Šafařík, K, Sahu, D, Schambach, J, Sekihata, D, Sheibani, O, Shimomura, M, Singh, R, Sitar, B, Stachel, J, Suaide, A.A.P, Szarka, I, Tambave, Ganesh Jagannath, Thomas, D, Tokumoto, R, Valle, N, Vercellin, E, Vermunt, L, Vértesi, R, Vickovic, L, Villalobos Baillie, Baillie, Villani, A, Von Haller, Haller, Yuan, Shiming, Zampolli, C, Zaviyalov, N, Zhang, B
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Zusammenfassung:Recent measurements of charm-baryon production in hadronic collisions have questioned the universality of charm-quark fragmentation across different collision systems. In this work the fragmentation of charm quarks into charm baryons is probed, by presenting the first measurement of the longitudinal jet momentum fraction carried by Λþ c baryons, zch k , in hadronic collisions. The results are obtained in proton-proton (pp) collisions at ffiffi s p ¼ 13 TeV at the LHC, with Λþ c baryons and charged (track-based) jets reconstructed in the transverse momentum intervals of 3 ≤ pΛþ c T < 15 GeV=c and 7 ≤ pjet ch T < 15 GeV=c, respectively. The zch k distribution is compared to a measurement of D0-tagged charged jets in pp collisions as well as to PYTHIA 8 simulations. The data hints that the fragmentation of charm quarks into charm baryons is softer with respect to charm mesons, in the measured kinematic interval, as predicted by hadronization models which include color correlations beyond leading-color in the string formation.