Axions, dark photons, fakeons, supersymmetric particles mirror of those known so far: these are just some of the at least 30 hypotheses on the particles of the new physics that in the space of one night landed on web platforms such as arXiv, which host preprint articles, which they still faced scrutiny from the scientific community. The race started immediately after the announcement of the results of the Fermilab Muon g-2 experiment, from which the discrepancy between the new data and the reference theory of particle physics, the Standard Model, emerged.
“Today more than 30 theoretical articles have been submitted on arXiv that try to explain the result. I think this is really a record”, Graziano Venanzoni, who is one of the promoters and co-spokesperson of the experiment, told ANSA Muon g-2 and researcher of the Pisa section of the National Institute of Nuclear Physics (Infn). “I have no memory of so many theoretical articles that appeared the day after an announcement of an experimental measure, which testify to the interest and importance of the result”.
The enthusiasm is tangible and to ignite it is the fact that never before has an experimental result been achieved so close to being considered a real discovery. “For almost 20 years we have been waiting for this new measure”, observes the theoretical physicist Massimo Passera, of the Padua section of the Infn. From the experiment conducted 20 years ago a discrepancy between the obtained measurement and the theory had emerged, so the measurement was repeated by Fermilab and “since yesterday we know that the new experiment confirms the result of 20 years ago”, said Passera.
“Finding a discrepancy is a very interesting situation: it could be that the Standard Model is not complete. We think that a part of it is missing, which could be responsible for the difference between the theory and the experiment. For this reason – observes the physicist – this morning we found more than 30 articles on Standard Model extensions online “.
It happened because, after the announcement of the Fermilab data, “the question becomes serious”. Final results may take 1 or 2 years. Already these data could indicate the existence of new particles and “now accelerators, such as the LHC of CERN in Geneva, could discover them”.
However, there remains one last road to explore because “it may be necessary to re-examine the prediction of the Standard Model, as suggested by the theoretical study recently published in the journal Nature, at the same time as the Fermilab was announced”.
To eliminate any doubts, an international group of physicists has proposed a new experiment at CERN, called MUonE, for which a first test is scheduled for October.