CERN discovered two new subatomic particles

The LHCb team , which studies the asymmetry of matter and antimatter in the interactions of “lovely quarks” at the Large Hadron Collider, announced on November 19 an experimental confirmation of the existence of two new baryonic particles. Particles Xi_b'- and Xi_b * - were predicted by the Standard Model, but so far they have never been observed. These particles from the xi-hyperon family — they, like the protons, contain three quarks: one “lovely” b, one “weird” s, and one “bottom” d. Due to the massiveness of d-quarks, the particles weigh six times more protons. In Xi_b'- the spins of two light quarks are directed against the back of the b-quark, and in Xi_b * they are all unidirectional.

“Nature has pampered us and gave us two particles for the price of one,” says Matthew Charles from CERN. “Xi_b'- is very close in mass to the total mass of its decay products; if it were a little easier, we would not see it at all. ” “The results are very happy. Thanks to the excellent performance of the LHCb detector, we were very clearly able to share the received signals, ”says Steven Blakk of Syracuse University, New York. "Another demonstration of the sensitivity and accuracy of LHCb sensors."

In addition to the masses of particles, researchers study their “width” (instability) and other details of their decay. The results are consistent with the predictions of quantum chromodynamics (CC). CC is part of the Standard Model, a theory that describes the physics of elementary particles, their interaction, and the forces that influence them. Checking KX with high accuracy is the key to understanding quark dynamics, which is characterized by high complexity of modeling.
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“If we want to go beyond the Standard Model, we first need to build a clear picture of it,” says LHCb Coordinator Patrick Koppenburg from the Nikhef Institute in Amsterdam. "Such high-precision studies will help us distinguish the manifestations of the Standard Model from any new unexpected phenomena in the future."

The calculations were carried out on the basis of measurements made during the work of the Collider in 2011-2012. After a long idle time, the BAC is being prepared for launch in 2015, when it will start working at higher energy levels.