Nuclear and Particle Physics Colloquium 115

(核与粒子物理学术报告会115)

Place: Shahe C726；腾讯会议： ID：797-560-420   密码：202112

Time:  15:00, December 11th, 2021

Title: Effective Field Theories and XY Z states at LHCb and BESIII

Speaker:  Jorgivan M. Dias

Abstract:

The hadron spectroscopy with heavy quarks (charm and bottom) have been triggering an intense wave of theoretical activity due to the large experimental information on the new hadrons observed among others by the LHCb and BESIII collaborations. They seem to have unconventional properties that cannot be easily explained by the successful quark model, and because of that, they have become candidates for the longstanding idea of multiquark configuration, also called exotic states. In this talk, we discuss the two most attractive multiquark models: Molecular and Tetraquark pictures adopted to interpret some new hadrons reported by the LHCb and BESIII collaborations over the past years. In particular, we discuss the singly and doubly heavy baryons like Ωc, Ωb, Ξcc and some new possible states in this baryonic sector. On the other hand, in the meson sector, we will talk about some XYZ states as, for example, the newly observed Tcc, the charged Zc’s, Zcs and X(5568) among others. They are explored under the perspective of two non-perturbative theoretical tools: Chiral Unitary and QCD sum rules approaches. More specifically, we will cover the advantages and disadvantages of each of them for the particular model adopted.

About Speaker:

Dr. Dias is currently a senior postdoctoral fellow at the Institute of Theoretical Physics, Chinese Academy of Sciences (ITP-CAS) in Beijing, China. He obtained his Ph.D. degree from University of Sao Paulo, Brazil, in 2015. Before moving to ITP, he held postdoctoral positions at University of Sao Paulo (2016-2017), University of Valencia (2017-2018), and University of Sao Paulo (2018-2019).