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謝予穎
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The LHCb Collaboration Announced the Discovery of a New System of Five Particles

The team notes that this observation improves our understanding of quantum theory in general and gives us new clues about the earliest moments of our universe.

In a paper released on 16 Mar 2017, the LHCb collaboration announced the discovery of a new system of five particles all in a single analysis. The exceptionality of this discovery is that observing five new states all at once is a rather unique event.

The particles were found to be excited states – a particle state that has a higher energy than the absolute minimum configuration (or ground state) – of a particle called "Omega-c-zero", Ωc0. This Ωc0 is a baryon, a particle with three quarks, containing two “strange” and one “charm” quark. Ωc0 decays via the strong force into another baryon, called "Xi-c-plus", Ξc+ (containing a “charm”, a “strange” and an “up” quark) and a kaon K-. Then the Ξc+ particle decays through the weak force in turn into a proton p, a kaon K- and a pion π+.

From the analysis of the trajectories and the energy left in the detector by all the particles in this final configuration, the LHCb collaboration could trace back the initial event – the decay of the Ωc0 – and its excited states.
These particle states are named, according to the standard convention, Ωc(3000)0, Ωc(3050)0, Ωc(3066)0, Ωc(3090)0 and Ωc(3119)0. The numbers indicate their masses in megaelectronvolts (MeV), as measured by LHCb.

Learn more>> http://home.cern/about/updates/2017/03/lhcb-observes-exceptionally-large-group-particles

► Read the CERN announcement "16 March 2017: The magic of the Ωc baryon">>
http://lhcb-public.web.cern.ch/lhcb-public/Welcome.html#Omega_c

► Read the scientific paper "Observation of five new narrow Ω0c states decaying to Ξ+cK−", published on arXiv>>
https://arxiv.org/abs/1703.04639

Image explanation: The image below shows the data (black dots) of the reconstructed mass distribution resulting from the combination of the Ξc+ and K- particles. The five particle states are the five narrow peaks standing out from the distribution of data. (Image: LHCb collaboration)

Further reading

► Omega baryons>> https://en.wikipedia.org/wiki/Omega_baryon

► Strong force>> https://home.cern/tags/strong-force

► Weak force>> https://home.cern/tags/weak-force

► Kaon>> https://home.cern/tags/kaon

► Pion>> https://home.cern/tags/pion


#Physics, #OmegaBaryons, #ElementaryParticles, #CERN, #LHCbCollaboration, #5ParticlesDiscovery, #Research
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