Podcasts about standard model higgs

A search is reported for Higgs boson decay to μ⁺μ¯ using data with an integrated luminosity of 24.8 fb(-1) collected with the ATLAS detector in pp collisions at s=7and8 TeV TeV at the CERN Large Hadron Collider. The observed dimuon invariant mass distribution is consistent with the Standard Model background-only hypothesis in the 120–150 GeV search range. For a Higgs boson with a mass of 125.5 GeV, the observed (expected) upper limit at the 95% confidence level is 7.0 (7.2) times the Standard Model expectation. This corresponds to an upper limit on the branching ratio BR(H→μ+μ−) of 1.5×10−31.5×10−3.

Stephen Sekula discusses the latest results on searches for new physics at ATLAS and CMS.

Abstract: The Standard Model of particle physics has been successfully tested experimentally for over 30 years with no discrepancies. Yet a key piece of the Standard Model, and one needed to provide mass to elementary particles, remained undetected. Experimental evidence from the ATLAS experiment at the CERN LHC for the production of a new neutral boson was presented. The production and decay of this particle is compatible with Standard Model Higgs boson. Additional measurements expected using the full 2012 data set were discussed. Presented October 12, 2012.

Sho Maruyama reviews Supersymmetric particle and Standard Model Higgs boson searches in high energy physics. Maruyama continues on to describe how trigger and Data Quality Monitoring system are used at the Compact Muon Solenoid experiment at CERN. The trend in trigger menu development will be discussed in detail. One of main focuses of this talk is the work that can be done by graduate students.

Andrei Gritsan presents on the production and decay of a new single resonance at the LHC, with examples ranging from the Standard Model Higgs boson to KK Graviton in the models with extra space dimensions.

The Large Hadron Collider at CERN is the most modern proton-proton collider and data taking will start in 2009, with a centre-of-mass energy of 7 TeV. The ATLAS detector, which is one of two multi-purpose detectors at the Large Hadron Collider, is able to detect a Standard Model Higgs boson if it exists. This is one of the main tasks of the ATLAS experiment. This thesis deals with a Standard Model Higgs boson produced in association with a W boson. The Monte Carlo study is based on physics events generated at the nominal centre-of-mass energy of the Large Hadron Collider of 14 TeV. Large parts of this analysis have been done using the global Grid infrastructure of the Large Hadron Collider experiments. A mass range of the Higgs boson of mH = 130 - 190 GeV has been taken into account. In this mass range, the Higgs boson dominantly decays into a pair of W bosons, leading to initially three W bosons: WH -> WWW. Two orthogonal analysis channels have been investigated in detailed studies of the background properties. The first channel considers the leptonic decay of two W bosons, such that the leptons are of opposite charge. The third W boson then decays hadronically. The analysis is based on one-dimensional cuts, where the best cuts found are strict cuts on the transverse momenta of the leptons, a cut on the invariant mass of the jets, as well as a cut on the transverse jet momenta and the missing transverse energy. The second decay channel studied is dedicated to the leptonic decay of all three W bosons. Again, cuts on the transverse momenta of the leptons and the jets have been proven to be efficient, as well as the use of the spatial correlation of the decay products of the Higgs boson. The invariant mass of the leptons with opposite sign has been emerged as a very efficient cut to reject dominant diboson background contributions. The discovery reach of both channels separately as well as the combination has been calculated using Bayesian methods. The discovery reach is at maximum for a mass range of mH = 150 - 170 GeV, with a peak for mH = 170 GeV at 5 sigma. All results are scaled to an integrated luminosity of L = 30 fb^-1, which corresponds to approximately three years of data-taking at the design luminosity of 10^33 cm^-2 s^-1. The associated WH production improves the discovery reach for a Standard Model Higgs boson at the ATLAS detector and would also be useful for precision measurements of the couplings of the Higgs boson.