Conveners
Parallel session A1
- Kai Yi (Nanjing normal university)
The production of open charm mesons in the fixed-target mode of the LHCb experiment provides a unique opportunity to study QCD dynamics at moderate center-of-mass energies and large Bjorken-$x$. In previous studies, the production of D mesons was investigated within the $k_{T}$-factorization approach, including the standard gluon–gluon fusion mechanism, the gluon–charm channel associated with...
We present a leading-order NRQCD factorization analysis of the exclusive two-photon production of spin-0 and spin-2 fully-charmed tetraquarks, $\gamma\gamma\to T_{4c}\left(0^{++}, 2^{++}\right)$. The respective short-distance coefficients are collected, enabling predictions for the two-photon decay widths $\Gamma\left( T_{4c}\to \gamma \gamma \right)$ in terms of non-relativistic...
I will discuss recent progress in applying a general theoretical framework to the study of three-body resonances in lattice QCD. As a concrete example, I will focus on the doubly-charmed tetraquark $T_{cc}^+$(3875) emerging as a state in elastic $DD\pi$ scattering amplitude. After a short overview of the tetraqaurk physics and the finite- and infinite-volume field-theory formalism, I will...
Recently, several LQCD simulations have proven that the interaction in the isoscalar channel in $DD^*$ scattering is attractive. This channel is naturally connected to the $T_{cc}(3875)^+$ which is observed in the $D^0D^0\pi^+$ invariant mass distribution. However, it remains an open question whether the virtual bound state found in these several LQCD simulations is actually linked to the LHCb...
The lowest-mass charmonium ground state, the η_c(1S), serves as a crucial laboratory for testing quantum chromodynamics (QCD) and understanding charmonium decay dynamics. Utilizing its world-leading data samples of J/ψ and ψ(3686) events, the BESIII experiment has recently achieved significant progresses in the study of η_c decays. This presentation will report three key results. First, we...
