Inclusive Higgs Boson Searches in Four-Lepton Final States at the LHC

The inclusive search for the Standard Model Higgs boson in four-lepton final states with the ATLAS and CMS detectors at the LHC pp collider is presented. The discussion focusses on the H-> ZZ^(*)->4l+X decay mode for a Higgs boson in the mass range 120 ~< M_H ~< 600 GeV/c^2. A prospective analysis is presented for the discovery potential based on a detailled simulation of the detector response in the experimental conditions of the first years of LHC running at low luminosity. An overview of the expected sensitivity in the measurement of the Higgs boson properties is also given.Comment: 4 pages, 5 figures, uses moriond.st

Measurement of gauge boson couplings and W spin density matrix

During the LEP2 period the e+e- collider increased its center of mass energy from 161 GeV to 209 GeV and a total integrated luminosity of approximately 700 pb-1 was recorded per experiment. Pairs of W bosons are produced and allow the study of gauge boson couplings involving W, Z and photon. The coupling of the W boson to the neutral gauge bosons have been measured and are in agreement with the Standard Model prediction. Limits are set on CP-violating couplings by a Spin Density Matrix analysis of the W decay products. No evidence has been found for couplings of three neutral gauge bosons. Limits are derived on couplings of four gauge bosons.Comment: 8 pages, 6 figure

(Anomalous) Gauge boson couplings

During the LEP2 period the e+e − collider increased its center-of-mass energy from 161 GeV up to 209 GeV. A total integrated luminosity of approximately 700 pb−1 was recorded per experiment. Massive W bosons are dominantly produced in pairs via e +e − interactions and gauge couplings involving the charged gauge bosons W+ and W−, and the neutral gauge bosons γ and Z, are studied by the LEP experiments. The LEP measurement of the coupling of the W boson to the neutral gauge bosons, g Z 1 = 0.984+.022 −.019, κγ = 0.973+.044 −.045, and λγ = −0.028+.020 −.021, are in agreement with the Standard Model expectation g Z 1 = 1, κγ = 1, and λγ = 0. Couplings between tree and four neutral gauge bosons are forbidden by the Standard Model. No evidence has been found for couplings of three neutral gauge bosons, parametrized by f Z,γ 4,5 and h Z,γ 1,2,3,4 . Limits are derived on couplings of four gauge bosons, parametrized by a Z,W 0 /Λ 2 , a W n /Λ 2 and a Z,W c /Λ 2 where Λ represents the energy scale for new physics. A lower limit on the techni-ρ mass of 600 GeV/c2 is set at 95% confidence level by the ALEPH experiment

Search for a Light Standard Model Higgs Model in the H \to WW* \toe \nu e \nu Channel

A prospective analysis for the discovery of a light Standard Model Higgs boson in the CMS experiment at the LHC collider is presented. The analysis focuses on the inclusive single production pp->H+X and the Higgs boson decay channel H->WW*->e+ nu e^-nu, for masses in the range 120 ~ 134\GeV/c^2 would be observed with a significance above 3 standard deviations in the e+ nu e- nu channel alone for an integrated LHC luminosity above 30 fb-1

Track Reconstruction with Cosmic Ray Data at the Tracker Integration Facility

The subsystems of the CMS silicon strip tracker were integrated and commissioned at the Tracker Integration Facility (TIF) in the period from November 2006 to July 2007. As part of the commissioning, large samples of cosmic ray data were recorded under various running conditions in the absence of a magnetic field. Cosmic rays detected by scintillation counters were used to trigger the readout of up to 15\,\% of the final silicon strip detector, and over 4.7~million events were recorded. This document describes the cosmic track reconstruction and presents results on the performance of track and hit reconstruction as from dedicated analyses