Conveners
Morning session 3: New Results in Hadron Spectroscopy (heavy quarks)
- Alexander Berezhnoy (SINP MSU)
Recently the LHCb Collaboration announced intriguing results on the double-J/psi production in proton-proton collisions. A coupled-channel interpretation of the measured di-J/psi spectrum is presented and a possible nature of the near-threshold state X(6200) is discussed.
In order to understand the nature of the XYZ particles, theoretical predictions of the various XYZ decay modes are essential. In this work, we focus on the semi-inclusive decay of heavy quarkonium hybrids into traditional quarkonium in the Born Oppenheimer EFT (BOEFT) framework. We present results of the decay rates for several heavy quark hybrids. We also develop a systematic framework in...
I discuss recent progress concerning the computation of the $\Pi_u$ and $\Sigma_u^-$ hybrid static potentials at small quark-antiquark separations. Such potentials are important for investigating masses and properties of heavy hybrid mesons in the Born-Oppenheimer approximation.
Recent lattice QCD studies of charmonium-like and bottomonium-like states will be presented. The masses and widths of charmonium-like states with isospin zero are extracted by considering the scattering on the lattice. We find conventional charmonia with J=0,1,2,3 in line with experiment and two exotic candidates just below D barD and Ds barDs thresholds. The bottomonium-like system with...
We study the hadronic production of $D$-wave states of $\bar b c$ quarkonium. The relative yield of such states is estimated for kinematic conditions of LHC experiments. The direct $B_c(D)$ production is complemented by NRQCD contributions being the same order $O(v^4)$. The NRQCD matrix elements are estimated within naive velocity scaling rule.
Recent results on heavy exotic hadrons obtained by the LHCb experiment are discussed:
- Tetraquarks with hidden charm (
X(3872),T_{cccc}(6900),Z_{cs}(4xxx)+,X(46xx)) - Pentaquarks with hidden charm (
P_c(4xxx)+,P_{cs}(4459)0) - Doubly charmed tetraquark (T_{cc}+)
Most of the results are based on an analysis of the full runs I and II LHCb dataset.
This talk is dedicated to...
