scattering length from photoproduction on the proton near the reaction threshold

反応閾値近くでの光生成から調べる散乱長

石川 貴嗣*; 藤村 寿子*; 深澤 宏司*; 橋本 亮*; He, Q.*; 本多 佑記*; 保坂 淳; 岩田 高広*; 甲斐田 俊*; 笠木 治郎太*; 川野 篤*; 鍬崎 秀三*; 前田 和茂*; 桝本 新一*; 宮部 学*; 宮原 房史*; 望月 恵一*; 村松 憲仁*; 中村 聡彦*; 中村 聡*; 縄 健一*; 大串 尚永*; 岡田 康友紀*; 岡村 憲有*; 小野寺 義人*; 小沢 恭一郎*; 坂本 泰伸*; 佐藤 衛*; Sato, T.*; 清水 肇*; 菅井 裕之*; 鈴木 耕拓*; 田島 靖久*; 高橋 真一郎*; 谷口 雄亮*; 土川 雄介*; 山崎 寛仁*; 山崎 竜司*; 吉田 浩司*

Ishikawa, Takatsugu*; Fujimura, Hisako*; Fukasawa, Hiroshi*; Hashimoto, Ryo*; He, Q.*; Honda, Yuki*; Hosaka, Atsushi; Iwata, Takahiro*; Kaida, Shun*; Kasagi, Jirota*; Kawano, Atsushi*; Kuwasaki, Shuzo*; Maeda, Kazushige*; Masumoto, Shinichi*; Miyabe, Manabu*; Miyahara, Fusashi*; Mochizuki, Keiichi*; Muramatsu, Norihito*; Nakamura, Akihiko*; Nakamura, Satoshi*; Nawa, Kenichi*; Ogushi, Shoei*; Okada, Yasuyuki*; Okamura, Kenyu*; Onodera, Yoshihito*; Ozawa, Kyoichiro*; Sakamoto, Yasunobu*; Sato, Mamoru*; Sato, T.*; Shimizu, Hajime*; Sugai, Hiroyuki*; Suzuki, Kotaku*; Tajima, Yasuhisa*; Takahashi, Shinichiro*; Taniguchi, Yuryo*; Tsuchikawa, Yusuke*; Yamazaki, Hirohito*; Yamazaki, Ryuji*; Yoshida, Hiroshi*

Photoproduction of the omega meson on the proton has been experimentally studied near the threshold. The total cross sections are determined at incident energies ranging from 1.09 to 1.15 GeV. The 1/2 and 3/2 spin-averaged scattering length and effective range between the CO meson and proton are estimated from the shape of the total cross section as a function of the incident photon energy: = (-0.97 + (0.07 ) fm and = (+2.78 ) + (-0.01 ) fm, resulting in a repulsive force. The real and imaginary parts for and are determined separately for the first time. A small -wave contribution does not affect the obtained values.