Study on QCD structure of nucleon spin at CERN-COMPASS

2017 Fiscal Year Final Research Report

• Project/Area Number: 26247032
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Yamagata University
• Principal Investigator: Iwata Takahiro 山形大学, 理学部, 教授 (70211761)
• Co-Investigator(Kenkyū-buntansha): 松田 達郎 宮崎大学, 工学部, 教授 (20253817) ; 宮地 義之 山形大学, 理学部, 准教授 (50334511)
• Co-Investigator(Renkei-kenkyūsha): DOSHITA NORIHIRO 山形大学, 理学部, 助教 (90451658) ; KONDO KAORI 山形大学, 理学部, 助教 (80451657) ; HASHIMOTO RYOU 山形大学, 理学部, プロジェクト研究員 (50644952) ; HORIKAWA NAOAKI 中部大学, 工学部, 教育支援員 (70022697) ; SUZUKI HAJIME 中部大学, 工学部, 教授 (20260044) ; SHIGERU ISHIMOTO KEK, 素粒子原子核研究所, 技術支援員 (50141974)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 核子スピン

Outline of Final Research Achievements

This study is on the orbital angular momentum(OAM) contribution of quarks to the nucleon spin, which is a key for the decomposition of the nucleon spin. We performed the first ever polarized Drell-Yan experiment to measure the asymmetry of the reaction with a negative charged pion beam incident on a polarized proton target. The results are consistent with the prediction of the perturbative QCD and suggest presence of the OAM. In addition, we performed a measurement for deeply virtual compton scattering(DVCS) with a 190GeV muon beam on a proton target to extract the generalized parton distribution(GPD) which is important information to study the OAM contribution.

Free Research Field

高エネルギー物理学