γγ interactions with KLOE

作     者：Federico Nguyen 

作者机构：INFN Sezione 'Roma TRE' 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2010年第34卷第6期

页      面：795-800页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

主　　题：e^+e^- collisions pseudoscalar meson width π pair production 

摘      要：Studies of γγ interactions are performed with the KLOE detector, without tagging of the outgoing e^＋e^-. The data sample is from an integrated luminosity of 240 pb^-1. It was collected at the φ-factory DAONE with e^＋e^- beams colliding at √s ≌1 GeV, below the φ resonance peak. We present preliminary results concerning the observation of the γγ→η process and the evidence for γγ→π^0π^0 production at low π^0π^0 invariant masses.