Powered by Indico v3.0.3
In the QCD theory, hadrons are described as mesons (qqbar, integer spin) or baryons (qqq, half integer spin). Exotic hadrons, which are not in qqbar or qqq configuration, are also allowed in QCD theory, and are searched for with great efforts and fruitful results in different experiments since last two decades. CMS analyzed the near threshold J/\psi J/\psi mass spectrum to search for possible full-charm exotic hadrons using the data collected by the CMS detector in 2016-2018. Two new structures as well as the X(6900) were observed in this analysis in the J/\psi J/\psi invariant mass spectrum. Possible interference effect is also explored and a model with the interference between these three structures improved the agreement between data and the fit.
About the speaker:
Dr. Jingqing Zhang obtained his Ph.D. degree in University of Chinese Academy of Sciences (UCAS) in 2014 and then worked as a post-doctor in IHEP and Ruhr University Bochum in 2015-2020. At BESIII experiment, he observed a new structure X(1840) in J/\psi radiative decaying into 3(\pi^+ \pi^-) and confirmed the existence of the X(1750) and clarified the confusion between the X(1750) and \phi(1680) in a simultaneous observation of these two states. Since 2020, Dr. Jingqing Zhang joined Nanjing Normal University and worked for the J/\psi J/\psi analysis at CMS experiment.
--------------------------
Zoom link: https://zoom.us/j/95437938973?pwd=QXlmZWxHRnphQkFuTXhzUzdRY2lJQT09
Zoom ID: 95437938973
Zoom password: 123456