A pentaquark and the first pair of tetraquarks

news/tmb/2022/lhcb-discovers-three-n-1.jpg" data-src="https://scx2.b-cdn.net/gfx/news/hires/2022/lhcb-discovers-three-n-1.jpg" data-sub-html="The new pentaquark, illustrated here as a pair of standard hadrons loosely bound in a molecule-like structure, is made up of a charm quark and a charm antiquark and an up, a down and a strange quark. Credit: CERN">

The new pentaquark, shown here as a pair of standard hadrons loosely bound in a molecule-like structure, consists of charm quarks, charm quarks, up and down quarks, and odd quarks. credit: CERN

The International Collaboration at the Large Hadron Collider (LHC) observed three never-before-seen particles: a new type of pentaquark and the first pair of tetraquarks, which includes a new type of tetraquark. The results, presented today at the CERN symposium, add three new alien members to the list of new hadrons discovered at the LHC. They will help physicists better understand how quarks are bonded together in these composite particles.


quark is elementary particles It comes in six flavors: top, bottom, captivating, exotic, top and bottom. They usually join together in binary and triple groups to form hadrons like the protons and neutrons that make up the nucleus of an atom. Rarely, however, it can also coalesce into four-quark and five-quark particles, or “quarks” and “pentaquarks.” Theorists predicted these strange hadrons at the same time as conventional hadrons, about six decades ago, but only recently, in the last 20 years, have they been observed by the LHCb and other experiments.

Most of the exotic hadrons discovered in the last two decades are tetraquarks or pentaquarks containing both an enchantment quark and an enchantment antiquark, with two or three remaining. sub atomic particles Be an up, down, or odd quark. But in the last two years, the LHCb has discovered a wide variety of exotic hadrons. Two years ago, the Collaboration discovered a quark quark consisting of two charm quarks and two charm quarks, and two “charming open” quarks consisting of a charm antiquark, an up quark, a down quark, and a strange antiquark. And last year, I came across the first example of a “double open magic” quadrant with two charm quarks and an ascending and descending antiquark. Open magic means the particle contains an enchantment quark without an equivalent antiquark.

news/tmb/2022/lhcb-discovers-three-n.jpg" data-src="https://scx2.b-cdn.net/gfx/news/hires/2022/lhcb-discovers-three-n.jpg" data-sub-html="The two new tetraquarks, illustrated here as single units of tightly bound quarks. One of the particles is composed of a charm quark, a strange antiquark and an up quark and a down antiquark (left), and the other is made up of a charm quark, a strange antiquark and an up antiquark and down quark (right). Credit: CERN">
LHCb discovers three new exotic particles: pentaquarks and the first pair of tetraquarks

The two new quarks are described here as a single unit of closely bound quarks. One particle is made up of charm quarks, strange antiquarks, up and down antiquarks (left), and the other is made up of charm quarks, odd antiquarks, ascending antiquarks, and bottom quarks (right). credit: CERN

The discoveries announced today by the LHCb collaboration include a new type of exotic hadron. The first type, observed in the analysis of the “decay” of the negatively charged B meson, is a pentagon consisting of charm quarks, charm antiquarks, ascending and descending quarks, and odd quarks. This was the first pentagon to be found to contain a strange quark. The result is a very large statistical significance of 15 standard deviations, far exceeding the five standard deviations required to claim particle observations in the Particle physics.

The second type is the double electrically charged quadrupole. It is an open enchanted tetraquark consisting of Charm Quarks, odd antiquarks, and up and down quarks antique, which was observed with its neutral counterpart in the combined analysis of the decay of the positively charged and neutral B meson. The new tetraquarks, observed with statistical significance of 6.5 (double charged particles) and 8 (neutral particles) standard deviations, represent the first time a pair of tetraquarks has been observed.

“The more analyzes we did, the more exotic hadrons we found,” said LHCb physics coordinator Nils Toning. “We experienced a period of discovery similar to that of the 1950s, when the discovery of the hadron “particle zoo” began and eventually led to quark Classic hadron model of the 1960s. We created the “Particle Zoo 2.0”.

“Discovering new types of tetraquarks and pentaquarks and measuring their properties will help theorists to develop a unified model of exotic hadrons, the exact properties of which are largely unknown,” said LHCb spokesman Chris Parks. “It will also help to better understand conventional hadrons.”

While some theoretical model Exotic hadrons are described as single units of tightly bound quarks, while other models envision them as pairs of modular hadrons loosely bound in a molecule-like structure. Only time and more research on exotic hadrons will tell if this is true grains one or the other or both.


A strange new particle of matter has been discovered, the tetraquark


further information:

Read more on the LHCb website: lhcb-outreach.web.cern.ch/2022 … neutral partner /

quote: LHCb has discovered three new exotic particles: pentaquark and the first pair of tetraquarks (2022, 5) Retrieved on July 5, 2022 from https://phys.org/news/2022-07-lhcb-exotic-particles-pentaquark-first- ever.html

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