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CERN announces the discovery of new “exotic” particles

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The European Center for Particle Physics (CERN) announced on Tuesday the discovery in its experiments of three new particles called “exotic”: a new type of pentaquark and the first pair of tetraquarks in history.

The discovery has been made in the LHCb experiment, the result of international scientific collaboration and which is part of the Large Hadron Collider (LHC), a ring located in a underground tunnel with a circumference of 27 kilometers on the border between Switzerland and France.

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The LHCb was conceived to explore what happened after the Big Bang and what allowed matter to resist and form the universe 13.8 billion years ago.

The discovery made public today is an opportunity for physicists to better understand how quarks come together to form particular compositional.

Quarks are elementary particles that generally come together in groups of two or three to form hadrons, such as the protons and neutrons that make up the nucleus of atoms.

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However, exceptionally, quarks can combine into particles of four or five, which is why they are called “tetraquarks” either “pentaquarks”.

These exotic hadrons had been predicted more than half a century ago by theoretical physicists at the same time as the classical hadrons, but it is only during the last two decades that advances in science have allowed their observation.

In the ten years since the discovery of the Higgs boson at CERNthe LHC – a machine in which proton beams collide at energies never reached before – has made possible the discovery of more than 60 compositional particles.

“The more analyzes we carry out, the more exotic hadron-like particles we find,” said the coordinator of physics at the LHCb, Niels Tuning, at a seminar at the scientific institution.

He explained that scientists are currently experiencing a time similar to that known in the 1950s, when it was beginning to be discovered “a real zoo of particles”, which were the hadrons.

This led to the elaboration in the following decade of the quark model for classical hadrons.

We are now creating a particle zoo 2.0”, he said to illustrate the leap that particle physics is taking with these discoveries. (YO)

Source: Eluniverso

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