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

Summary, in English

The production cross sections of D0 and Λ+c hadrons originating from beauty-hadron decays (i.e., nonprompt) were measured for the first time at midrapidity (|y|<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/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 e+e− collisions.

• Author: S. Acharya; S. Basu; P. Christiansen; J. Hansen; K.E. Iversen; O. Matonoha; A.F. Nassirpour; R. Nepeivoda; A. Ohlson; D. Silvermyr; J. Staa; V. Vislavicius; S.C. Zugravel; N. Zurlo
• Department/s: Particle and nuclear physics; Education Strategy Support
• Publishing year: 2023
• Language: English
• Publication/Series: Physical Review D
• Volume: 108
• Issue: 11
• Links: http://dx.doi.org/10.1103/PhysRevD.108.112003
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 2470-0010