Model Independent Determination of HWWHWW coupling and Higgs total width at ILC

This article is based on the talk presented at the International Workshop on Future Linear Colliders (LCWS13) which held during November 11-15, 2013 at Tokyo, Japan. We present several analyses related to the Higgs total width study at ILC based on the full detector simulation of ILD, which are \eevvH followed by \Htobb and \HtoWW. The studies show that at \unit{250}{GeV} we can determine the Higgs total width with a relative precision of 11% and the $HWW$ coupling with 4.8%, whereas at \unit{500}{GeV} the expected precision can be significantly improved to 5% and 1.2% respectively, assuming the baseline integrated luminosities of ILC, which are \unit{250}{fb^{-1}} @ \unit{250}{GeV}, \unit{500}{fb^{-1}} @ \unit{500}{GeV}, and a beam polarization of $P(e^{-},e^{+})=(-80$. A new approach of removing pile-up particles based on multivariate method developed during those analyses is also presented.Comment: Talk presented at the International Workshop on Future Linear Colliders (LCWS13), Tokyo, Japan, 11-15 November 2013; based on previous note LC-REP-2013-02

Improved Formalism for Precision Higgs Coupling Fits

Future e+e- colliders give the promise of model-independent determinations of the couplings of the Higgs boson. In this paper, we present an improved formalism for extracting Higgs boson couplings from e+e- data, based on the Effective Field Theory description of corrections to the Standard Model. We apply this formalism to give projections of Higgs coupling accuracies for stages of the International Linear Collider and for other proposed e+e- colliders.Comment: 34 pages, 4 figures; v4: clarifications and new references added; v5, additional references adde

A novel technique for the measurement of the avalanche fluctuation of gaseous detectors

We have developed a novel technique for the measurement of the avalanche fluctuation of gaseous detectors using a UV laser. The technique is simple and requires a short data-taking time of about ten minutes. Furthermore, it is applicable for relatively low gas gains. Our experimental setup as well as the measurement principle, and the results obtained with a stack of Gas Electron Multipliers (GEMs) operated in several gas mixtures are presented.Comment: 7 pages, 7 figures. For the proceedings of VCI2016, to be published in Nucl. Instrum. Methods Phys. Res.