arXiv subjects

Guang-you Qin

Publications and source records attributed to Guang-you Qin.

3 recordsLinked to original sources

arXiv2023

A discussion on the anomalous threshold enhancement of $J/ψ$ -- $ψ(3770)$ couplings and $X(6900)$ peak

The attractive interaction between $J/ψ$ and $ψ(3770)$ has to be strong enough to form the molecular resonant structure, i.e., $X(6900)$. We argue that since $ψ(3770)$ decays predominantly into a $D\bar D$ pair, the interactions between $J/ψ$ and $ψ(3770)$ may be significantly enhanced due to the three point $D\bar D$ loop diagram. The enhancement comes from the anomalous threshold located at $t=-1.288$GeV$^2$, which effect propagates into the $s$-channel partial wave amplitude in the vicinity of $\sqrt{s}\simeq 6.9$GeV. This effect may be helpful in forming the $X(6900)$ peak.

hep-ph↗

arXiv2023

The $X(6900)$ peak could be a molecular state

The analyses of the LHCb data on $X(6900)$ found in di-$J/ψ$ and $J/ψψ(3686)$ systems are performed using a momentum-dependent {Flatté}-like parameterization. The use of the pole counting rule and spectral density function sum rule give consistent conclusions that $X(6900)$ may not be a molecule of $J/ψψ(3686)$. Nevertheless it is still possible that $X(6900)$ be a molecule of higher states, such as $J/ψψ(3770)$, $χ_{c0}χ_{c2}$, etc.

hep-ph↗

arXiv2015

Physics perspectives of heavy-ion collisions at very high energy

Heavy-ion collisions at very high colliding energies are expected to produce a quark-gluon plasma (QGP) at the highest temperature obtainable in a laboratory setting. Experimental studies of these reactions can provide an unprecedented range of information on properties of the QGP at high temperatures. We report theoretical investigations of the physics perspectives of heavy-ion collisions at a future high-energy collider. These include initial parton production, collective expansion of the dense medium, jet quenching, heavy-quark transport, dissociation and regeneration of quarkonia, photon and dilepton production. We illustrate the potential of future experimental studies of the initial particle production and formation of QGP at the highest temperature to provide constraints on properties of strongly interaction matter.

nucl-th↗