Measurements of the production yields of charm baryons (Lambda_c+) and charm mesons (D0) in proton-lead collisions at a nucleon-nucleon center-of-mass energy of 8.16 TeV are presented. The data were collected in 2016 with the CMS experiment and correspond to an integrated luminosity of 186 nb−1. The Lambda_c+ baryon is reconstructed from the decay channel Lambda)c+ to KS0p, while the D0 meson is reconstructed via D0 to K− pi+. The Lambda_c+ baryon and D0 meson yields are extracted in several charged-particle multiplicity classes. No strong multiplicity dependence of the Lambda_c+ -to- D0 yield ratio is observed, unlike the observed strange baryon to strange meson yield ratio of Lambda/Lambda- to KS0, which shows a strong multiplicity dependence. This observation indicates different mechanisms for the multiplicity evolution of hadronization processes for charm and strange quarks and provides new constraints to the understanding of heavy flavor production and collectivity in small collision systems.
Multiplicity dependence of charm baryon and charm meson production in pPb collisions at sqrt(s)=8.16 TeV
Tornago, M.;Cappati, A.;Meridiani, P.;Amapane, N.;Argiro, S.;Bellan, R.;Bellora, A.;Costa, M.;Covarelli, R.;Grippo, M.;Kiani, B.;Luongo, F.;Mecca, A.;Migliore, E.;Mulargia, R.;Obertino, M. M.;Pacher, L.;Siviero, F.;Sola, V.;Solano, A.;Soldi, D.;Tarricone, C.;Umoret, G.;Shchelina, K.;Rumerio, P.;Ravera, F.;Salvatico, R.;Vagnerini, A.;
2025-01-01
Abstract
Measurements of the production yields of charm baryons (Lambda_c+) and charm mesons (D0) in proton-lead collisions at a nucleon-nucleon center-of-mass energy of 8.16 TeV are presented. The data were collected in 2016 with the CMS experiment and correspond to an integrated luminosity of 186 nb−1. The Lambda_c+ baryon is reconstructed from the decay channel Lambda)c+ to KS0p, while the D0 meson is reconstructed via D0 to K− pi+. The Lambda_c+ baryon and D0 meson yields are extracted in several charged-particle multiplicity classes. No strong multiplicity dependence of the Lambda_c+ -to- D0 yield ratio is observed, unlike the observed strange baryon to strange meson yield ratio of Lambda/Lambda- to KS0, which shows a strong multiplicity dependence. This observation indicates different mechanisms for the multiplicity evolution of hadronization processes for charm and strange quarks and provides new constraints to the understanding of heavy flavor production and collectivity in small collision systems.| File | Dimensione | Formato | |
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