Previous measurements show that B mesons decay into electrons and muons（ μ ), which violates the standard model of particle physics and provides evidence for the discovery of new physics, but a new study overturns this point. The upper and lower quark detectors (LHCb) experimental cooperation group of the Large Hadron Collider of the European Nuclear Research Center announced that their latest research showed that the frequency of B mesons decaying into electrons was consistent with that of their heavier "cousin" muon, and the hope of finding new physics was dashed accordingly. Relevant papers have been submitted to the preprint website. In 2014, LHCb reported for the first time the weak difference between muon and electron "production". At that time, scientists said that when proton proton collisions produced large particles called B mesons, these B mesons would decay rapidly. The most common decay is to produce another type of meson, the K-meson, plus a pair of positive and negative particles: either electrons and positrons, or muons and anti muons. The standard model predicted that the frequency of electrons and muons should be roughly the same, but the data at that time showed that the frequency of positron and antielectron pairs was higher. Moreover, over time, this anomaly in the decay of B mesons seems to become more obvious, with a confidence level of 3 sigma, which is less than the 5 sigma (i.e., the confidence level is as high as 99.9999%) that is usually required to claim "new discoveries". In addition, some measurements of B mesons also deviate from the theoretical predictions based on the standard model of particle physics. Scientists believe that this may help them discover new physics. But the latest research overturns this conclusion. Chris Parks, a spokesman for LHCb and a physicist at the University of Manchester, said that the results of the latest report contained more data than the previous measurements of B meson decay conducted by the LHCb cooperation group, and they also carried out a more thorough study of possible confounding factors. He explained that the obvious differences in previous measurements involving K mesons were partly due to researchers mistaking some other particles for electrons. Although LHC experiment is good at capturing muons, it is more difficult to detect electrons. (Liu Xinshe)
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Source：xinhuanet
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