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 IOPP Seminar : Prof. Wei Chen(陈伟), Sun Yat-sen University （中山大学), May 24, Friday, 4:00 pm, Room 9409 Time & Place: May 24, Friday, 4:00 pm, Room 9409Speaker: Prof. Wei Chen(陈伟), Sun Yat-sen University  （中山大学）Title:  Petaquark and tetraquark statesAbstract: The past seventeen years have witnessed tremendous progress on the experimental and theoretical explorations of the multiquark states. Especially the LHCb collaboration not only confirmed the existence of the hidden-charm pentaquarks but also provided strong evidence of the molecular picture. Besides the well-known $XYZ$ and $P_c$ states, we will discuss more interesting tetraquark and pentaquark systems either with one, two, three or even four heavy quarks. Some very intriguing states include the fully heavy exotic tetraquark states $QQ\bar Q\bar Q$ and doubly heavy tetraquark states $QQ\bar q\bar q$. The $QQ\bar Q\bar Q$ states may be produced at LHC while the $QQ\bar q\bar q$ system may be searched for at BelleII and LHCb. In the theoretical aspect, we will emphasize the model-independent predictions of various models which are truly/closely related to Quantum Chromodynamics (QCD). There have also accumulated many lattice QCD simulations through multiple channel scattering on the lattice in recent years, which provide deep insights into the underlying structure/dynamics of the XYZ states. Previous：IOPP Forum : Prof. Chris Parkes, University of Manchester, May 31, Friday, 10:00am, Room 9409 Next：IOPP Seminar :Prof. Jun Gao (高俊), Shanghai Jiao Tong University, May 23, Thursday, 10:00am, Room 9409

Institute of Particle Phisics;