![]() ![]() The measurements of the Higgs boson’s properties have reached a new stage in precision and rare decay modes can be addressed. “This evidence of Higgs boson decays to second-generation matter particles complements a highly successful Run 2 Higgs physics programme. Interactions between the Higgs boson and muons had, therefore, not been seen at the LHC. Muons are much lighter in comparison and their interaction with the Higgs field is weaker. The interaction with the heaviest quarks, the top and bottom, was measured in 2018. So far, the ATLAS and CMS experiments have observed the Higgs boson decays into different types of bosons such as W and Z, and heavier fermions such as tau leptons. ![]() By measuring the rate at which the Higgs boson decays into different particles, physicists can infer the strength of their interaction with the Higgs field: the higher the rate of decay into a given particle, the stronger its interaction with the field. The Higgs boson is the quantum manifestation of the Higgs field, which gives mass to elementary particles it interacts with, via the Brout-Englert-Higgs mechanism. The Higgs boson seems to interact also with second-generation particles in agreement with the prediction of the Standard Model, a result that will be further refined with the data we expect to collect in the next run,” says Roberto Carlin, spokesperson for the CMS experiment.Ī candidate of a Higgs boson decay into two muons as recorded by CMS. “CMS is proud to have achieved this sensitivity to the decay of Higgs bosons to muons, and to show first experimental evidence for this process. The combination of both results would increase the significance well above 3 sigma and provides strong evidence for the Higgs boson decay to two muons. ATLAS’ two sigma result means the chances are one in 40. One of the main methods of studying the Higgs boson’s properties is by analysing how it decays into the various fundamental particles and the rate of disintegration.ĬMS achieved evidence of this decay with 3 sigma, which means that the chance of seeing the Higgs boson decaying into a muon pair from statistical fluctuation is less than one in 700. The Higgs boson, produced from proton collisions at the Large Hadron Collider, disintegrates-referred to as decay-almost instantaneously into other particles. Physicists at CERN have been studying the Higgs boson since its discovery in 2012 to probe the properties of this very special particle. These new results have pivotal importance for fundamental physics because they indicate for the first time that the Higgs boson interacts with second-generation elementary particles. The physics process of the Higgs boson decaying into muons is a rare phenomenon as only about one Higgs boson in 5000 decays into muons. While electrons are classified as a first-generation particle, muons belong to the second generation. Muon is a heavier copy of the electron, one of the elementary particles that constitute the matter content of the Universe. GENEVA-The ATLAS and CMS experiments at CERN have announced new results which show that the Higgs boson decays into two muons. CERN Experiments Announce First Indications of a Rare Higgs Boson ProcessĪ candidate ATLAS event display of a Higgs boson decay to two muons. To interview a Brookhaven Lab scientist about these new results, contact Karen McNulty Walsh, 631 344-8350. ![]() “The coupling of the Higgs boson with muons has never been measured before, and such a result is an important milestone that opens up new frontiers in the study of the Higgs boson properties and may give us insight into new physics beyond the Standard Model of particle physics.” For more information about Brookhaven's role in research at ATLAS, see. “These results shed light into the elusive sector of extremely rare decays of the Higgs boson to light fermions,” he said. Brookhaven Lab postdoctoral fellow Gaetano Barone coordinated the team of several international scientists and young researchers that analyzed the ATLAS data reported here. host laboratory for the ATLAS experiment at the LHC and plays multiple roles in this international collaboration, from construction and project management to data storage, distribution, and analysis. Department of Energy's Brookhaven National Laboratory serves as the U.S. The following press release about new research results from the Large Hadron Collider (LHC) was issued by CERN, the European particle physics laboratory. ![]()
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