Model Independent Determination of $HWW$ coupling and Higgs total width at ILC

Abstract

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 $P(e^{-},e^{+})=(-80%,+30%)$. A new approach of removing pile-up particles based on multivariate method developed during those analyses is also presented.