Download or read book Ratio Method of Measuring $w$ Boson Mass written by and published by . This book was released on 2010 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes an alternative method of measuring the W boson mass in D0 experiment. Instead of extracting M{sub W} from the fitting of W → e[nu] fast Monte Carlo simulations to W → e[nu] data as in the standard method, we make the direct fit of transverse mass between W → e[nu] data and Z → ee data. One of the two electrons from Z boson is treated as a neutrino in the calculation of transverse mass. In ratio method, the best fitted scale factor corresponds to the ratio of W and Z boson mass (M{sub W}/M{sub Z}). Given the precisely measured Z boson mass, W mass is directly fitted from W → e[nu] and Z → ee data. This dissertation demonstrates that ratio method is a plausible method of measuring the W boson mass. With the 1 fb−1 D0 Run IIa dataset, ratio method gives M{sub W} = 80435 ± 43(stat) ± 26(sys) MeV.