Experimental investigation of Higgs Mechanism and development/construction of Fast Tracking system

2015 Fiscal Year Final Research Report

• Project/Area Number: 24684016
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Waseda University
• Principal Investigator: YORITA Kohei 早稲田大学, 理工学術院, 准教授 (60530590)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: ヒッグス粒子 / 湯川結合 / LHC-ATLAS実験 / 高速飛跡トリガー / ATCA/VME / 大容量メモリーASIC

Outline of Final Research Achievements

We performed the search for H->ττ decay mode and finally found the excess over background expectations with an observed significance of 4.5 standard deviations by using LHC/ATLAS Run1 data. It indicates the world first’s evidence for fermion-yukawa coupling and signal strength was consistent with the Standard Model prediction. Moreover based on the success of H->ττ analysis, we extended our activity to the search top quark-Yukawa coupling. By these inclusive searches, The SM Higgs mechanism is considered to be valid in terms of fermion-Yukawa coupling sector within uncertainties. In addition, we built a test bench for Fast tracker R&D in Waseda campus and completed PCB design, prototyping testing, mass production in Japan (yield rate was 100%). 80 boards were transferred to CERN and successfully installed to the ATLAS detector. This achievement would be powerful improvement for data taking at upcoming higher luminosity operation of LHC.

Free Research Field

素粒子実験