Publication

Multiplicity Dependence of Charm Baryon and Charm Meson Production in Ppb Collisions at √s<sub>nn</sub>=8.16 Tev

2025

Abstract

Measurements of the production yields of charm baryons (Lambda(+)(c)) and charm mesons (D-0) 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) -> K(S)(0)p, while the D-0 meson is reconstructed via D-0 -> K- pi(+). The Lambda(+)(c) baryon and D-0 meson yields are extracted in several charged-particle multiplicity classes. No strong multiplicity dependence of the Lambda(+)(c) -to-D-0 yield ratio is observed, unlike the observed strange baryon to strange meson yield ratio of Lambda/(Lambda) over bar to K-S(0), 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.

Official source

https://infoscience.epfl.ch/entities/publication/8637a02b-1964-4714-91e5-8a10f0e2d74d

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8637a02b-1964-4714-91e5-8a10f0e2d74d

About this result

Related concepts (32)

Charm quark

The charm quark, charmed quark, or c quark is an elementary particle of the second generation. It is the third-most massive quark, with a mass of 1.27GeV/c2 (as measured in 2022) and a charge of +2/3 e. It carries charm, a quantum number. Charm quarks are found in various hadrons, such as the J/psi meson and the charmed baryons. There are also several bosons, including the W and Z bosons and the Higgs boson, that can decay into charm quarks.

Omega baryon

The omega baryons are a family of subatomic hadron (a baryon) particles that are represented by the symbol _Omega and are either neutral or have a +2, +1 or −1 elementary charge. They are baryons containing no up or down quarks. Omega baryons containing top quarks are not expected to be observed. This is because the Standard Model predicts the mean lifetime of top quarks to be roughly 5e-25s, which is about a twentieth of the timescale for strong interactions, and therefore that they do not form hadrons.

Pentaquark

A pentaquark is a human-made subatomic particle, consisting of four quarks and one antiquark bound together; they are not known to occur naturally, or exist outside of experiments specifically carried out to create them. As quarks have a baryon number of + 1/3, and antiquarks of − 1/3, the pentaquark would have a total baryon number of 1, and thus would be a baryon. Further, because it has five quarks instead of the usual three found in regular baryons ( 'triquarks'), it is classified as an exotic baryon.