Abstract
In the context of particle physics, within the ATLAS and CMS experiments at large hadron collider (LHC), this work presents the discussion of the discovery of a particle compatible with the Higgs boson by the combination of several decay channels, with a mass of the order of 125.5 GeV. With increased statistics, that is the full set of data collected by the ATLAS and CMS experiments at LHC ( s1/2 = 7GeV and s1/2 = 8GeV ), the particle is also discovered individually in the channel h-->γγ with an observed significance of 5.2σ and 4.7σ, respectively. The analysis dedicated to the measurement of the mass mh and signal strength μ which is defined as the ratio of σ(pp --> h) X Br(h-->X) normalized to its Standard Model where X = WW*; ZZ*; γγ ; gg; ff. The combined results in h-->γγ channel gave the measurements: mh = 125:36 ± 0:37Gev, (μ = 1:17 ± 0:3) and the constraint on the width Γ(h) of the Higgs decay of 4.07 MeV at 95%CL. The spin study rejects the hypothesis of spin 2 at 99 %CL. The odd parity (spin parity 0- state) is excluded at more than 98%CL. Within the theoretical and experimental uncertainties accessible at the time of the analysis, all results: channels showing the excess with respect to the background-only hypothesis, measured mass and signal strength, couplings, quantum numbers (JPC), production modes, total and differential cross-sections, are compatible with the Standard Model Higgs boson at 95%CL. Although the Standard Model is one of the theories that have experienced the greatest number of successes to date, it is imperfect. The inability of this model to describe certain phenomena seems to suggest that it is only an approximation of a more general theory. Models beyond the Standard Model, such as 2HDM, MSSM or NMSSM, can compensate some of its limitations and postulate the existence of additional Higgs bosons.
Highlights
Particle physics is concerned with describing the structure of matter by studying its elementary components and their interactions
In order to refine the precision of the parameters of this theory, to try to highlight the Higgs boson and to test models beyond the Standard Model, physicists built an accelerator of giant particles, 27 km in circumference, buried 100 m underground: the Large Hadron Collider (LHC) at CERN
My work is a discussion of the discovery of the Higgs boson in the canal h → γγ. we propose a panorama of the Standard Model of particle physics and its theoretical construction based on gauge theories
Summary
Particle physics is concerned with describing the structure of matter by studying its elementary components and their interactions. Https://rajpub.com/index.php/jap mass zero at the photon; it breaks the gauge symmetry of the electroweak interaction This mechanism is associated with a residual particle, the Higgs boson. In order to refine the precision of the parameters of this theory, to try to highlight the Higgs boson and to test models beyond the Standard Model, physicists built an accelerator of giant particles, 27 km in circumference, buried 100 m underground: the Large Hadron Collider (LHC) at CERN. The latter accelerates heavy ions and and above all proton beams and makes them collide. It will be devoted to the presentation of models beyond the MS, among which the 2HDM
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