Recent LHCb results on hadrons of multiple charm quarks
by
Prof.Yanxi Zhang
(PKU)
→
Asia/Shanghai
S408
S408
Description
The confinement of the strong interaction is not fully understood from first principle QCD calculations. As low energy bound state of the strong interaction, properties of hadrons provide the opportunity to investigate this unknown part the Standard Model. Besides conventional mesons and baryons that are made up of two and three constituents, hadrons with more than three quarks are also allowed, called exotic states.
In the last years, tens of new hadron states are observed in e+e- and hadron colliders consistent with signatures of exotic hadrons, in particularly those with heavy quark(s). Exotic hadrons may be formed with a complex internal structure allowed by nonunique color configuration, which triggered various QCD-based models to give an explanation. For most states, however, there is no consensus on their internal structure. A coherent explanation of these exotic hadrons is a demanding task in the field. Further information from experiments are essential to shed light on this problem. Designed for precision measurements of heavy flavour, the LHCb experiment at CERN have been leading the efforts in studies of hadron spectroscopy.
In this talk, I will discuss LHCb recent discoveries of new hadrons with multiple charm quarks, both conventional and exotic ones. I will also briefly mention theoretical work that is relevant to understand their internal structure.
Speaker:
Yanxi ZHANG/张艳席, assistant professor at the Peking University. He received his bachelor and PhD degrees from Tsinghua University in 2007 and 2013 respectively. Then he worked as a postdoc researcher in Tsinghua University (China), CNRS/LAL (France) and CERN (Switzerland) before he moved back to the Peking University in 2020. He has been working with the LHCb experiment since PhD, in the field of heavy quarkonium production, heavy hadron spectroscopy, heavy ion collisions and flavor physics. He was involved in studies that allow to observe pentaquark states, doubly charmed baryons Xicc++ and fully heavy tetraquark state X(6900) at LHCb. He served as one of the conveners of LHCb "b-hadron and Quarkonia" and "Ions and Fixed-Target" physics working groups.
Tecent Meeting：
https://meeting.tencent.com/dm/Ux6TlVh8HpEK
Meeting ID：209-238-556