scholarly journals Spectrum of radial, orbital and gluonic excitations of charmonium

2006 ◽  
Author(s):  
Mehmet B. Oktay
Keyword(s):  
Radial Orbital ◽  
Gluonic Excitations

scholarly journals Radially anisotropic systems with forces: equilibrium states

2015 ◽  
Vol 81 (5) ◽  
Author(s):  
Pierfrancesco Di Cintio ◽  
L. Ciotti ◽  
C. Nipoti
Keyword(s):  
Phase Space ◽  
Distribution Functions ◽  
Space Distribution ◽  
Anisotropic Models ◽  
Interparticle Forces ◽  
Phase Space Distribution ◽  
Radial Orbital ◽  
Anisotropic Systems ◽  
Preparatory Work ◽  
Tangential Directions

We continue the study of collisionless systems governed by additive$r^{-{\it\alpha}}$interparticle forces by focusing on the influence of the force exponent${\it\alpha}$on radial orbital anisotropy. In this preparatory work, we construct the radially anisotropic Osipkov–Merritt phase-space distribution functions for self-consistent spherical Hernquist models with$r^{-{\it\alpha}}$forces and$1\leqslant {\it\alpha}<3$. The resulting systems are isotropic at the centre and increasingly dominated by radial orbits at radii larger than the anisotropy radius$r_{a}$. For radially anisotropic models we determine the minimum value of the anisotropy radius$r_{ac}$as a function of${\it\alpha}$for phase-space consistency (such that the phase-space distribution function is nowhere negative for$r_{a}\geqslant r_{ac}$). We find that$r_{ac}$decreases for decreasing${\it\alpha}$, and that the amount of kinetic energy that can be stored in the radial direction relative to that stored in the tangential directions for marginally consistent models increases for decreasing${\it\alpha}$. In particular, we find that isotropic systems are consistent in the explored range of${\it\alpha}$. By means of direct$N$-body simulations, we finally verify that the isotropic systems are also stable.

scholarly journals Light Hadron Spectroscopy at BESIII

2018 ◽  
Vol 46 ◽  
pp. 1860022
Author(s):  
Xingtao Huang
Keyword(s):  
Line Shape ◽  
Light Quark ◽  
Radiative Decays ◽  
Data Sets ◽  
Hadron Spectroscopy ◽  
Quark Sector ◽  
Light Hadron ◽  
Gluonic Excitations

BESIII has collected [Formula: see text] and [Formula: see text] of [Formula: see text], which are the world’s largest data samples of [Formula: see text] and [Formula: see text] from [Formula: see text] collision. Radiative decays of charmonium provide a gluon-rich environment and are therefore regarded as one of the most promising hunting grounds for gluonic excitations. Significant progresses in the light-quark sector have been made with the unprecedented high statistics data sets. Several recent results on light hadron spectroscopy and light hadron decays will be reported, including: 1, the observation of the anomalous line shape of [Formula: see text] near [Formula: see text] mass threshold and related studies; 2, studies of glueballs in [Formula: see text] radiative decays; 3, search for [Formula: see text] exotic in [Formula: see text].

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