British physicist detects rare particle decay
Beijing time, November 14th, according to the British Broadcasting Corporation (BBC), physicists recently detected one of the rarest particle decay phenomena in nature. This discovery will be a major blow to the current physics theory, that is, the supersymmetric theory.
The reason why supersymmetry theory has gained popularity is because it well constitutes a modification to the existing standard model for describing the properties of subatomic particles. It can explain some defects in the standard model. However, a discovery reported by researchers at the Hadron Collider Physics Conference held in Kyoto, Japan, recently, does not match many of the most probable models of the supersymmetry theory.
Professor Chris Parkes, a spokesperson for the British part of the Large Hadron Collider project, told BBC News: "The supersymmetry theory may not have died immediately, but this recent observation It's really enough to get it into the hospital. "
The supersymmetry theory predicts that there are still larger versions of these particles that have been detected. If these particles can be found, then it will help explain phenomena such as dark matter. Observations show that the edge of the galaxy rotates too fast to be explained by the amount of matter we see in the galaxy, so scientists believe that dark matter provides additional gravity. However, they cannot find the trace of the existence of dark matter. They believe that supersymmetric particles may be a possible candidate for dark matter.
However, the researchers of the Large Hadron Collider project this time gave a solid blow to those who wished to find such supersymmetric particles.
The researchers measured how a particle called "Bs meson" decays into two muons. This is the first time this phenomenon has been observed. In fact, researchers have calculated that this kind of particle will only undergo this decay three times every 1 billion years.
If supersymmetric particles exist, then this decay should happen much more frequently. This experiment is one of the touchstones for testing the theory of supersymmetry. However, this observation seems to suggest that this mainstream theory in the physics world may actually be wrong.
The confidence interval of this experimental result is 3.5Σ, which means that there is a possibility of 1/4300. The result is wrong. The experimental team observed a false signal, which means that the decay did not occur, but they happened to be I saw a similar signal in the data. This confidence makes this research result worthy of further discussion, and once the confidence reaches or exceeds 5Σ, then this result can be released as a discovery at this time.
Professor Val Gibson, from the LHCb team at the University of Cambridge in the United Kingdom, said that the results of this experiment made his colleagues around him who were studying the theory of supersymmetry "restless."
In fact, if you follow the standard model, you can infer this result naturally. Physicists have pointed out that if there are supersymmetric particles, then the project should have been detected by the detector on the Large Hadron Collider, but the fact is that no such particles were detected.
If supersymmetry is not the ultimate answer to dark matter, then theoretical physicists will have to find alternatives to explain the shortcomings of the existing standard models. So far, those researchers who are committed to finding "new physics" have been in dead ends.
Dr. Marc-Olivier Bettler, a physicist at the University of Cambridge, UK, is a member of the data analysis team for this experimental project. He said: "If new physics exists, it must be hidden in the standard model Behind him. "
The results of this study cannot completely rule out the possibility of the existence of supersymmetric particles. But according to Professor Parkes, "the hiding place of this new physics is becoming less and less".
However, supporters of supersymmetry, such as Professor John Ellis of King's College London, believe that this observation "is in fact consistent with supersymmetry". He said: "In fact, this is expected in some supersymmetric models. For such detection results, I can't sleep at night."
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