Publication

First Observation of the Λb0 → Λc+ds- k+ k- Decay and Search for Pentaquarks in the Λc+ds- System

Aurelio Bay
2025

Abstract

The Lambda(0)(b) -> Lambda D-+(c)s(-) K+ K- decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 6 fb-1. The ratio of branching fraction to that of Lambda(0)(b) -> Lambda D-+(c)s(-) decays is measured as 0.0141 +/- 0.0019 +/- 0.0012, where the first uncertainty is statistical and the second systematic. A search for hidden-charm pentaquarks with strangeness is performed in the Lambda D-+(c)s(-) system. No evidence is found, and upper limits on the production ratio of Pc (c) over bars(4338)(0) and Pc (c) over bars(4459)(0) pentaquarks relative to the Lambda D-+(c)s(-) final state are set at the 95% confidence level as 0.12 and 0.20, respectively.

Official source

https://infoscience.epfl.ch/entities/publication/fc0c43e5-91a9-4b3b-a5b1-3ecbd135af18

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Aurelio Bay
2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fc0c43e5-91a9-4b3b-a5b1-3ecbd135af18

About this result

Related concepts (32)

Lambda baryon

The lambda baryons (Λ) are a family of subatomic hadron particles containing one up quark, one down quark, and a third quark from a higher flavour generation, in a combination where the quantum wave function changes sign upon the flavour of any two quarks being swapped (thus slightly different from a neutral sigma baryon, _Sigma0). They are thus baryons, with total isospin of 0, and have either neutral electric charge or the elementary charge +1. The lambda baryon _Lambda0 was first discovered in October 1950, by V.

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.

Hadron

In particle physics, a hadron (ˈhædrɒn; hadrós; "stout, thick") is a composite subatomic particle made of two or more quarks held together by the strong interaction. They are analogous to molecules that are held together by the electric force. Most of the mass of ordinary matter comes from two hadrons: the proton and the neutron, while most of the mass of the protons and neutrons is in turn due to the binding energy of their constituent quarks, due to the strong force.

Related publications (1)

First Observation of the Λ<i><sub>b</sub></i><sup>0</sup> → Λ<i><sub>c</sub></i><sup>+</sup><i>d<sub>s</sub></i><sup>-</sup> <i>k</i><sup>+</sup> <i>k</i><sup>-</sup> Decay and Search for Pentaquarks in the Λ<i><sub>c</sub></i><sup>+</sup><i>d<sub>s</sub></i><sup>-</sup> System

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