Studying charm hadronization c /D in pp Charm baryon-to-meson - - PowerPoint PPT Presentation
Studying charm hadronization c /D in pp Charm baryon-to-meson ratio in pp : factor ~3 larger ( p T <5 GeV/ c ) than what expected from e + e - collisions: Challenge for universality of the fragmentation functions? -> z-value
Nikhef Stafoverleg 17/10/2019 a.grelli
Charm baryon-to-meson ratio in pp: factor ~3 larger (pT<5 GeV/c) than what expected from e+e- collisions: Challenge for universality of the fragmentation functions? -> z-value measurement needed to conclude
Nikhef Stafoverleg 17/10/2019 a.grelli
1 10
) c (GeV/
T
p
0.2 0.4 0.6 0.8 1 1.2
/ D
+ c
Λ
ALICE Preliminary
| < 0.5 y = 5.02 TeV, |
NN
s
Filled markers: pp measured reference
T
p Open markers: pp
Pb − 10% Pb − Pb − 50% Pb − 30 pp
ALI−PREL−323761
Charm baryon-to-meson ratio in Pb-Pb: Similar results as in pp but slightly larger Charm baryon-to-meson ratio in pp: factor ~3 larger (pT<5 GeV/c) than what expected from e+e- collisions: Challenge for universality of the fragmentation functions? -> z-value measurement needed to conclude
Nikhef Stafoverleg 17/10/2019 a.grelli
Charm baryon-to-meson ratio in Pb-Pb: Does hadronization via recombination play a role? or “just” fragmentation? -> need more precision to conclude (stat. and syst) Charm baryon-to-meson ratio in Pb-Pb: Similar results as in pp but slightly larger Charm baryon-to-meson ratio in pp: factor ~3 larger (pT<5 GeV/c) than what expected from e+e- collisions: Challenge for universality of the fragmentation functions? -> z-value measurement needed to conclude
Nikhef Stafoverleg 17/10/2019 a.grelli
ALICE upgrade: Future is coming fast and soon we will be able to collect and analyse LHC run III data -> Nikhef among the main players on ALICE tracker upgrade
Charm baryon-to-meson ratio in Pb-Pb: Does hadronization via recombination play a role? or “just” fragmentation? -> need more precision to conclude (stat. and syst) Charm baryon-to-meson ratio in Pb-Pb: Similar results as in pp but slightly larger Charm baryon-to-meson ratio in pp: factor ~3 larger (pT<5 GeV/c) than what expected from e+e- collisions: Challenge for universality of the fragmentation functions? -> z-value measurement needed to conclude