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| Subject: CERN - NEW PARTICLE Thu Feb 28, 2019 1:02 pm | |
| http://strangesounds.org/2019/02/cern-new-particule-large-hadron-collider.html NEW fast-spinning charmonium particle discovered during Large Hadron Collider experiments at CERNBy Strange Sounds - Feb 28, 2019
The LHCb collaboration has spotted a new particle, dubbed the ψ3(1D). Its mass and other properties place it squarely in the charmonium family that includes the better-known J/ψ particle, which was the first particle containing a “charm quark” to be discovered and won its discoverers a Nobel prize in physics. The LHCb experiment discovers new charmonium particle. Image by Maximilien Brice/CERN
Charmonium Particles
Charmonium particles are two-quark particles (called mesons) composed of a charm quark and its antimatter counterpart, the charm antiquark. Charm quarks are the third most massive of six quark types. Just like atoms, mesons can be observed in excited states of higher energy, in which the mesons’ constituent quarks move around each other in different configurations. These different arrangements give rise to a gamut of particles with different masses and quantum properties such as spin, which can be thought of as the rotation of a system around its axis.
Discovery of NEW Charmonium particule
To catch the new charmonium particle, the LHCb collaboration, one of the four main experiments at the Large Hadron Collider, studied the decays of charmonium states produced in proton–proton collisions into pairs of D mesons, using data recorded between 2011 and 2018; D mesons are the lightest particles containing charm quarks.
Observing such excited states and measuring their properties provides a way of testing models of quantum chromodynamics (QCD), the theory that describes how quarks are stuck together into composite particles. What’s more, knowledge of the full collection of these states helps identify exotic states with more than three quarks, such as tetraquarks, that are also predicted by QCD but have only recently been discovered. If all of the excited states are accounted for, physicists can be more confident that any remaining ones are exotic.
Goals of research
The collaboration measured the range of masses of the D-meson pairs and then added up how many times they recorded each mass value within the measured range. They then looked for an excess of events, or bump, in this mass distribution, and found a new, narrow peak at a mass that corresponds to a previously unobserved charmonium state dubbed the ψ[size=11]3(1D). The particle has a spin value of 3, making this the first observation of a spin-3 charmonium state. The high spin value could account for the peak’s narrow width and the fact it has taken so long to find.Future studies of the properties of this new charmonium state and its relatives will help physicists better understand the strong force that binds together quarks, among the smallest particles that we know of.[/size] |
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michael371 Super Elite
Posts : 2800 Reputation : 140 Join date : 2012-01-04
| Subject: Re: CERN - NEW PARTICLE Thu Feb 28, 2019 2:18 pm | |
| i thought it was in a shutdown phase unless this article is from back earlier?....yep, it shut down in december and is not restarting until 2021 | |
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researcher Admin
Posts : 14439 Reputation : 955 Join date : 2011-08-13 Age : 71 Location : San Diego
| Subject: Re: CERN - NEW PARTICLE Fri Mar 01, 2019 3:04 am | |
| First thing I thought of when seeing the new particles name; ~ Please don’t squeeze the Charmonium ~ !! FOXTROT JULIET BRAVO !! | |
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