讲座摘要：In April 2019, the complete Belle II detector began its first physics run at the asymmetric energy e+e- SuperKEKB collider located in Tsukuba, Japan. The Belle II experiment aims at collecting an integrated luminosity of 50 ab-1, 50 times larger than its predecessor, Belle. The dataset collected in the running of 2019 corresponds to 10.57 fb-1, which not sufficient to probe new territory, but very useful for assessing the performance of the detector and rediscovering many known standard model processes. I will review the most significant physics results produced in the last few months, which include the observation of many particles and decay channels important for the Belle II physics program, and present an outlook for the short term prospects for the experiment.
主讲人简介：单葳，2017年北京大学博士毕业，2017-2019年湖南师范大学讲师，2019年至今在名古屋大学做访问学者，发表多篇学术论文，代表性论文为(1) M. Ablikim et al., (BESIII Collaboration), "Observation of a Neutral Structure near the D¯D_ Mass Threshold in e+e− ! (D¯D _)0_0 at p s = 4.226 GeV and p s = 4.257 GeV", Phys. Rev. Lett. 115, 222002 (2015). (Corresponding Author)
(2) Wei Shan, "Exotic Zc states at BESIII", AIP Conf. Proc. 1735, 060001 (2016).
(3) Wei Shan, "XYZ states at BESIII", Nucl. Part. Phys. Proc. 78, 282 (2017).
(4) M. Ablikim et al., (BESIII Collaboration), "Measurement of the Absolute Branching
Fraction of the Inclusive Decay _+ c ! _ + X", Phys. Rev. Lett. 121, 062003 (2018).
(5) M. Ablikim et al., (BESIII Collaboration), "Observation of e+e− ! D+ s ¯D (_)0K− and study of the P-wave Ds mesons", Chin. Phys. C 43, 031001 (2019).