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

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초록

The production cross sections of D-0 and Lambda(+)(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 root 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 bb production cross section per unit of rapidity at midrapidity, estimated from these measurements, is d sigma(bb)/dy|(|y|<0.5 )= 83.1 +/- 3.5(stat) +/- 5.4(syst)(-3.2)(+12.3) (extrap) mu b. The baryon-to-meson ratios are computed to investigate the hadronization mechanism of beauty quarks. The nonprompt Lambda(+)(c)/D-0 production ratio has a similar trend to the one measured for the promptly produced charmed particles and to the p/pi(+) and Lambda/K-S(0) ratios, suggesting a similar baryon-formation mechanism among light, strange, charm, and beauty hadrons. The p(T) -integrated nonprompt Lambda(+)(c)/D-0 ratio is found to be significantly higher than the one measured in e(+)e(-) collisions.

키워드

PP COLLISIONSPBPB COLLISIONSCROSS-SECTIONSFRAGMENTATIONHADRONSD-0
제목
Study of flavor dependence of the baryon-to-meson ratio in proton-proton collisions at √s=13 TeV
저자
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DOI
10.1103/PhysRevD.108.112003
발행일
2023-12-08
유형
Article
저널명
Physical Review d
108
11