The production cross sections of D0 and Λ+c hadrons originating from beauty-hadron decays (i.e., non prompt) were measured for the first time at midrapidity (jyj < 0.5) by the ALICE Collaboration in proton-proton collisions at a center-of-mass energy √s = 13 TeV. They are described within uncertainties by perturbative QCD calculations employing the fragmentation fractions of beauty quarks to baryons measured at forward rapidity by the LHCb Collaboration. The b¯ b production cross section per unit of rapidity at midrapidity, estimated from these measurements, is dσb¯b/d/dy|y|<0.5 = 83.1 +/- 3.5 (stat) +/- 5.4 (syst)+12.3 −3.2 (extrap) μb. The baryon-to-meson ratios are computed to investigate the hadronization mechanism of beauty quarks. The nonprompt Λ+c =D0 production ratio has a similar trend to the one measured for the promptly produced charmed particles and to the p=π+ and Λ=K0S ratios, suggesting a similar baryon-formation mechanism among light, strange, charm, and beauty hadrons. The pT -integrated nonprompt Λ+c =D0 ratio is found to be significantly higher than the one measured in eþe− collisions.

Study of flavor dependence of the baryon-to-meson ratio in proton-proton collisions at √s = 13 TeV

Camerini, P.;Contin, G.;De Martin, C.;Fragiacomo, E.;Luparello, G.;Margagliotti, G.  V.;Piano, S.;Rui, R.;Suljic, M.;Villani, A.;Zaccolo, V.;
2023-01-01

Abstract

The production cross sections of D0 and Λ+c hadrons originating from beauty-hadron decays (i.e., non prompt) were measured for the first time at midrapidity (jyj < 0.5) by the ALICE Collaboration in proton-proton collisions at a center-of-mass energy √s = 13 TeV. They are described within uncertainties by perturbative QCD calculations employing the fragmentation fractions of beauty quarks to baryons measured at forward rapidity by the LHCb Collaboration. The b¯ b production cross section per unit of rapidity at midrapidity, estimated from these measurements, is dσb¯b/d/dy|y|<0.5 = 83.1 +/- 3.5 (stat) +/- 5.4 (syst)+12.3 −3.2 (extrap) μb. The baryon-to-meson ratios are computed to investigate the hadronization mechanism of beauty quarks. The nonprompt Λ+c =D0 production ratio has a similar trend to the one measured for the promptly produced charmed particles and to the p=π+ and Λ=K0S ratios, suggesting a similar baryon-formation mechanism among light, strange, charm, and beauty hadrons. The pT -integrated nonprompt Λ+c =D0 ratio is found to be significantly higher than the one measured in eþe− collisions.
2023
Pubblicato
File in questo prodotto:
File Dimensione Formato  
PRD_108(2023)112003_1-19.pdf

accesso aperto

Tipologia: Documento in Versione Editoriale
Licenza: Creative commons
Dimensione 1.03 MB
Formato Adobe PDF
1.03 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3096921
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 5
social impact