An experiment at Brookhaven National Laboratory in the United States may have uncovered evidence for physics beyond the Standard Model of particle physics. The 949E team discovered twice as much as expected by the standard model of rare K-nutrient decays.
Physics Web (translation: Dikla Oren)
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An experiment at Brookhaven National Laboratory in the United States may have uncovered evidence for physics beyond the Standard Model of particle physics. The 949E team discovered twice as much as expected by the standard model of rare K-mass decays. The results of the experiment, presented at Brookhaven on March XNUMX, were submitted to Physical Review Letters.
K mesons or kaons (K-mesons) are unstable particles, and they may decay in several ways. In a certain, rare but important decay, a positive kaon - the composition of an up quark and a strange antiquark - decays into a positive pion, a neutrino and an antineutrino. The standard model predicts that this particular decay should occur once in thirteen billion decays. However, the decay rate may be affected by particles and processes, which are not included in the standard model. Any discrepancy between the predictions of the Standard Model and the experimental results, therefore, may be evidence of these unfamiliar particles and processes.
The 949E team used the AGS accelerator at Brookhaven to produce a beam of kaons and a detector capable of detecting 1.6 million decays per second. Also, the detector is able to filter out the pion-neutrino-antineutrino events from all the other decays that the kaon undergoes.
The results of the experiment imply the rate of occurrence of the rare disintegration of once in seven billion disintegrations - a rate almost double the predictions of the standard model. The results of the experiment come after two other times where the breakdown was discovered in Brookhaven in 1997 and 2002.
"It is very important that we look at whether these events of disintegration represent a statistical fluctuation or an important breakthrough," said Douglas Berryman of the University of British Columbia and a spokesman for the experiment team. "Additional runs of the experiment will resolve the issue and firmly establish whether we are expecting a significant deviation from the standard model," he added.
"If our findings continue at the current rate, we will see about twenty more such breakup events," reads a Brookhaven press release. "Such results may fundamentally change our current view of particle physics. We will have to expand our picture of the fundamental elements of the universe and the forces between them." The 949E collaboration includes physicists from Canada, Russia, Japan and the United States.
(Translation: Dikla Oren)
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