So far the LHC experiments had detected the Higgs particle by its disintegration into other particles called bosons, carriers of the forces acting in nature, while the evidence decays into fermions were inconclusive. This is the first clear evidence of this new decay mode of the Higgs boson, whose analysis in Spanish researchers have participated.
Members of the ATLAS collaboration presented new results in a seminar at CERN last November 26. They show for the first time with a level of certainty sigma-4 near the 5 sigma necessary to proclaim a genuine observation-the Higgs boson decaying into two tau leptons (represented by the Greek letter ?). It is the first time this phenomenon has been measured in the Higgs boson. The Higgs boson is discovered in 2012 by the ATLAS and CMS LHC particle experiments revealed the existence of a new field force in Nature. Also known mechanism Brout-Englert-Higgs in honor physicists who proposed (two of them, Englert and Higgs, awarded the Nobel Prize in Physics and the Prince of Asturias Research), this force field is responsible for the origin of the mass of other elementary particles. Without this mechanism to generate mass, matter that makes up everything we see in the universe and ourselves would not have been able to form as we know it.was known that the Higgs decays into one of two basic types of particles exist: bosons, responsible interactions (forces) that occur in nature. The Brout-Englert mechanism-Higgs was proposed to explain the origin of the mass of these particles. However, the standard model of particle physics, the theory that describes the elementary particles and their interactions, postulated that the other basic type of particles, fermions, also acquired its mass by this mechanism. Now is the first time that scientists have clearly seen that the Higgs boson also decays into these particles, fermions, the ‘bricks’ that make up the visible matter in the universe (eg, electrons and quarks that make up the protons of an atom are fermions). In fact, the results obtained by scientists of the ATLAS experiment are consistent with the predictions of the standard model. These results have been obtained with the data collected in 2012. Since its launch in 2015 after two years of maintenance, scientists hope to get many more LHC data, in addition to the energy function for which it was designed. Researchers at the Institute of Corpuscular Physics (IFIC, CSIC-UV) have been directly involved in this analysis, with an important role in the characterization of the background events, determination of statistical methods, multivariate technique definition and selection of the input variables , which have been crucial to achieve this result with a high level of statistical confidence.
Meanwhile, researchers at the Institute of High Energy Physics (IFAE) participants ATLAS experiment work on other channels to study the decay of International Higgs fermions (quarks top and bottom). In ATLAS also involved researchers from the Institute of Microelectronics of Barcelona (IMB-CNM-CSIC) and the Autonomous University of Madrid (UAM). In total, approximately 200 Spanish researchers involved in the LHC, grouped by the National Centre for Particle Physics, Astroparticle and Nuclear (CPAN). (Source: CPAN)
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