Experimental Physics Division (EPD) seminar

Title: Threshold enhancement in ppbar invariant mass spectrum

　　Speaker: Dr. Xianwei Kang(康现伟), Beijing Normal university

　　Chair: Dr. Yanping Huang (黄燕萍), IHEP

　　Time: 10:00, Thursday , 18th, April, 2019

　　Location: B326, main building

　　Indico:https://indico.ihep.ac.cn/event/9949/

　　Abstract:

　　The huge peak around the proton-antiproton (ppbar) mass threshold was observed in the J/psiradiative decay from BESII, and confirmed by BESIII. The nature about that is still challenging andvarious interpretations have been proposed. We have seriously and quantitatively considered thefinal state interaction (FSI) between ppbar in several decay modes observed in BES collaboration.It turns out that the FSI must not be a neglectable ingredient, and the prominent peak mentioned inJ/psi radiative decay would be interpreted as a bound state.

　　In this talk, we will introduce how we construct the chiral potential to treat nucleon-antinucleonscattering, andthe resulting FSI. We have also applied our such method to the process of e+e- -> multipions, wherethe observed clear dip structure in experiment is also described.

　　About the speaker:

　　Dr. Xianwei Kang (康现伟）

　　2017, Vistor in Academia Sinica, Taiwan

　　2014 – 2017, Post-doc in Juelich research center, Germany and Murcia university , Spain

　　2014, Ph.D in Physics, Bonn university, Germany

　　2008, Bachelor in Physics, Henan Normal university

　　More detailed CV can be found in indico pagehttps://indico.ihep.ac.cn/event/9949/