Measuring the top Yukawa coupling at the ILC at sqrt(s) = 500 GeV and R&D for the ILD-TPC

by Dr Ryo Yonamine

Friday 25 Jan 2013, 14:00 → 15:00 Europe/Brussels

Large seminar room (IIHE (ULB-VUB))

abstract: This report is based on the International Linear Collider (ILC) project. The ILC has been proposed as the next energy-frontier machine designed to uncover the physics of the Terascale and beyond. The clean initial states of the ILC are ideally suited for high precision measurements, and the ILC is expected to advance our knowledge of particle physics “qualitatively” beyond that will be available from the Large Hadron Collider (LHC). The report consists of two parts. In the first part, the feasibility of the direct measurement of the top Yukawa coupling in the first phase of operation at sqrt(s) =500 GeV, where the Higgs self-coupling will be measured with the e+e- to ZHH process, is investigated first using a fast detector simulation and then with a full detector simulation of the ILD detector. In the second part, I will present the development of an analytic formula to calculate spatial resolution of a MPGD TPC and experimental studies made with prototypes of the MPGD TPC. The analytic formula allows us to calculate spatial resolutions of MPGD TPCs in various conditions from basic parameters such as primary and secondary ionization probabilities, diffusion constants and the Polya parameter of gas gain fructuation of TPC gases, and the geometry of readout electrodes. This new analytic formula enables us to optimize the parameters for the best position resolution and to extrapolate measured results obtained by prototypes to any full scale TPC.