US, WASHINGTON (ORDO NEWS) — At CERN, an exotic particle consisting of four charmed quarks was first discovered. The discovery is reported in an article published in the arXiv.org preprint repository.
The team of scientists used a new method for searching for anomalies, which are called bumps in particle physics, against other fixed collision products (events) of proton beams dispersed in the Large Hadron Collider to an energy of 13 tera-electron-volts.
The researchers looked at the data obtained between 2009-2013 and 2015-2018 at the LHCb detector and found a “bump” in the distribution of particle masses (J / ψ mesons), consisting of a charmed quark and a charmed antiquark. The observation was made with a confidence level of more than five sigma (five standard deviations), which allows scientists to talk about the existence of a new, previously unknown particle.
“Bump” corresponds to a resonance (short-lived particle) with a mass range of 6.2-7.4 GeV / s2 (gigaelectron-volts per light velocity squared), which, according to forecasts, corresponds to a particle consisting of two enchanted quarks and two enchanted antiquarks, then there it belongs to tetraquarks. It is not yet clear whether the new particle is a real tetraquark, that is, a system of particles closely related to each other, or a “hadron molecule” – two closely interacting mesons, that is, particles consisting of a quark-antiquark pair.
LHCb is one of four main detectors installed at the Large Hadron Collider and designed to search for anomalies in interactions consisting of quarks of particles. The main goal of the experiment is to discover New Physics, which lies outside the Standard Model, which describes the interaction of all known elementary particles.
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