The new particle - Pentaquark has just been discovered

Scientists at the Large Hadron Collider have announced the discovery of a new particle called the pentaquark.

The discovery involves quarks - elementary particles make up the protons and neutrons in the atomic nucleus. The new particle is called the pentaquark, meaning its structure consists 5 quarks. Until recently, physicists have only seen the atoms with constituents of 2 or 3 quarks.

The existence of pentaquark particles is conjectured first time in the 1960s. However, just like Higgs boson (also called the Higgs particle or "God Particle"), scientists can not prove its existence for decades until it was discovered in the Large Hadron Collider - the largest particle accelerator which provides the most powerful accelerator in the world, was designed to research, break the limits and defaults of the standard model - the current basic theory of particle physics.

pentaquark

The Large Hadron Collider has discovered pentaquark particle

In 1964, two physicists Murray Gell Mann and George Zweig had hypothesized the independent existence of subatomic particles quarks. They suggested that the key components of atomic particles - baryons and mesons - was best explained if they themselves composed of other component particles. Zweig uses the term "aces" for new building blocks according to hypotheses, but Gell-Mann called them "quark".

Zweig and Gell-Mann's pattern also suggest the existence of other states of quarks, such as pentaquark. This hypothesis particle is said to be made up of four quarks and one anti-quark particle.

In the mid 2000s, many researchers claim to have found particles pentaquark, but their findings were dismissed by later trials.

"There is quite a history with pentaquarks, which is also why we were very careful in putting this paper forward," Patrick Koppenburg, physics co-ordinator for LHCb at Cern, told BBC News. "It's just the word 'pentaquark' which seems to be cursed somehow because there have been many discoveries that were then superseded by new results that showed that previous ones were actually fluctuations and not real signals."

pentaquark
The scientists in LHC

In the new study, physical experts looked at how a subatomic particle called Lambda b decay or converted to 3 other particles inside the LHC. Analytical result reveals that the intermediate states occasionally involved the production of these three particles. The intermediate states named Pc (4450) + and Pc (4380) +.

Physicist Tomasz Skwarnicki from the Syracuse University (USA), a member of the new research team, said he and his colleagues examined every possibilities of the signal on and concluded that they can only be explained by the state pentaquark.

LHCb spokesperson Guy Wilkinson commented: "The pentaquark is not just any new particle… It represents a way to aggregate quarks, namely the fundamental constituents of ordinary protons and neutrons, in a pattern that has never been observed before in over fifty years of experimental searches. Studying its properties may allow us to understand better how ordinary matter, the protons and neutrons from which we're all made, is constituted."

 

By: Nick Cunningham

    Tags:
  1. physics

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