思维盛宴聚焦WTO

11月6日,在距多哈会议不到一周的日子里,北京大学经济研究中心的万众楼,正在进行着一场思维盛宴:由南风窗杂志社发起,并由北京大学经济研究中心、泰山产业研究院、改革开放论坛和本社共同主办的“WTO 与中国改革研讨会”在这里隆重举行。此间,既有来自政府研究机构的知名学者如吴明瑜、贾康、江小涓、范恒山、黄范章、张燕生、林志远、马宇等人,又有林毅夫、海闻、卢锋、张维迎、张曙光、秦晖、李曙光等一大批活跃的学院派专家,还有段永基、吴力、华贻芳等工商企业界人士。可以说,这是一场官学商之间思想的大碰撞、大交流。会议有两个议题,一是“WTO 与中国政府职能的改革”,另一个是“WTO 与中国企业的竞争力”,与会者为中国入世与改革各抒已见,呼吁呐喊,拳拳之心,溢于言表。作为协办单位的新浪网作了全程现场直播。这里,本刊摘取精要,以飨读者

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies