Light-quark hadron spectroscopy: Experimental systematics and angular momentum systematics

1974 ◽  
Vol 9 (5) ◽  
pp. 1259-1329 ◽  
Author(s):  
Malcolm H. Mac Gregor
Keyword(s):  
Angular Momentum ◽  
Light Quark ◽  
Hadron Spectroscopy

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].

DIQUARK FORMATION IN ANGULAR-MOMENTUM-EXCITED BARYONS

2009 ◽  
Vol 24 (10) ◽  
pp. 1987-1994 ◽  
Author(s):  
ANTONIO CARLOS BAPTISTA ANTUNES ◽  
LEILA JORGE ANTUNES
Keyword(s):  
Angular Momentum ◽  
Heavy Quark ◽  
Potential Barrier ◽  
Light Quark ◽  
Heavy Quarks ◽  
Centrifugal Barrier ◽  
Large Angular Momentum

Diquarks, or metastable clusters of two quarks inside baryons, are shown to be produced by angular momentum excitation. In baryons with a light quark and two heavy quarks with large angular momentum (L>2), the centrifugal barrier that appears in the rotation frame of the two heavy quarks prevents the light quark from passing freely between the two heavy quarks. The light quark must tunnelize through this potential barrier, which gives rise to the clusters of a light and a heavy quark.

SOLUTIONS OF A DIRAC HYDROGENLIKE MESON AND SCALAR CONFINEMENT AT LOW ORBITAL ANGULAR MOMENTUM STATES

1999 ◽  
Vol 14 (11) ◽  
pp. 1703-1710
Author(s):  
M. A. AVILA
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Light Quark ◽  
Relativistic Effects ◽  
Wave Functions ◽  
Confinement Potential ◽  
Relativistic Corrections ◽  
Lorentz Scalar ◽  
Dirac Hamiltonian

Wave functions of a heavy-light quark [Formula: see text] system described by a covariant Dirac Hamiltonian are analyzed. By assuming that the confinement potential is a Lorentz scalar (S), the slope of the Isgur–Wise function is calculated at zero recoil point. The result obtained is ξ′(1)= -0.93± 0.05. This means that the solutions are perfectly consistent. If relativistic corrections in the light quark wave functions are included the result is ξ′(1)=-1.01± 0.04. From heavy-light data this suggests that if relativistic effects are considered, scalar confinement is reliable in low orbital angular momentum states.

ORBITAL RADIUS OF A HYDROGEN-LIKE MESON IN S-, P- AND D-STATES

1999 ◽  
Vol 14 (30) ◽  
pp. 2059-2072 ◽  
Author(s):  
M. A. AVILA
Keyword(s):  
Angular Momentum ◽  
Hydrogen Atom ◽  
Probability Density Function ◽  
Coulomb Potential ◽  
Quark Mass ◽  
Light Quark ◽  
Radial Coordinate ◽  
Expectation Value ◽  
Maximum Value ◽  
Light Quark Mass

Radial probability density function of a heavy quark–light quark [Formula: see text] system in the states S, P and D, is studied numerically. It is found that the maximum of this function at r=a0 and the light quark energy (Eq) are related through [Formula: see text], where l is the orbital angular momentum, Z=0.446/ξ, and ξ is the strength of the color Coulomb potential. Phenomenology predicts that to difference of the hydrogen atom of QED, the "color atomic number" is such that Z≤1. This can be thought of as due to an anti-screening effect from the gluons. The respective expectation value for the radial coordinate in these states is found to be [Formula: see text] These results are valid for ξ in the range 0.446<ξ<0.646 and a light quark mass in the range 0<m<300 MeV. The above relations coincide with the maximum value of the slope of the Isgur–Wise at zero recoil point in the following way [Formula: see text] The relations found in the present work imply that [Formula: see text], from which we argue that the value of ξ′(1) is very sensitive to the color Coulomb-like interaction U=-ξ/r.

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