scholarly journals On some models of the exotic hadron states

2014 ◽  
Vol 12 (2) ◽  
pp. 151-158 ◽  
Author(s):  
Sinisa Ignjatovic ◽  
Vesna Jovanovic
Keyword(s):  
Bound States ◽  
Color Singlet ◽  
Exotic Meson ◽  
Hadron Spectroscopy ◽  
Per Se ◽  
Theoretical Evidence ◽  
Meson States ◽  
Exotic Hadron

There are several kinds of exotic hadron states. In this paper, we are concerned with the flavor exotic meson states: the tetraquarks and meson molecules. Two distinct models of tetraquarks are studied: diquark-antidiquark bound states and uncorrelated quarks. Although diquark is not a color singlet, there is a strong theoretical evidence that such states do exist within hadrons. Both tetraquark models as well as methods used to study such states are reviewed. The meson-meson molecules are also mentioned. It is remarked that hadron spectroscopy per se may not always be sufficient to discern between physically distinct models.

BETHE-SALPETER EQUATION FOR A FOUR FERMION SYSTEM I

1988 ◽  
Vol 03 (10) ◽  
pp. 953-963 ◽  
Author(s):  
S.K. KIM ◽  
B. MÜLLER ◽  
W. GREINER
Keyword(s):  
Heavy Ion Collisions ◽  
Bound States ◽  
Heavy Ion ◽  
Ladder Approximation ◽  
Body System ◽  
Fermion System ◽  
Exotic Meson ◽  
Ion Collisions ◽  
Electrons And Positrons ◽  
Meson States

We derive the Bethe-Salpeter equation for bound states of a four-body system. We treat only two-body interaction kernels in the ladder approximation. Our equations should be applicable for the description of exotic meson states ([Formula: see text] states) and the “polypositronium” states discussed in connection with the interpretation of the narrow coincidence peaks in the spectra of electrons and positrons observed in heavy ion collisions.

Spectroscopy of heavy quark hadrons

2014 ◽  
Vol 23 (07) ◽  
pp. 1461007
Author(s):  
Makoto Oka
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Heavy Quarks ◽  
P Wave ◽  
Charmed Baryon ◽  
Hadron Spectroscopy ◽  
Distinct Features

Heavy quarks play special roles in the hadron spectroscopy. Some distinct features of heavy quark dynamics and their significance in the P-wave baryons with a single heavy quark are discussed. We also explore a new color configuration in exotic tetra-quark mesons with two heavy quarks. Finally, possibility of bound states of a charmed baryon with a nucleon and nuclei are examined.

scholarly journals BESIII future prospects in exotic hadron spectroscopy

2018 ◽  
Vol 182 ◽  
pp. 02133
Author(s):  
Kai ZHU
Keyword(s):  
Future Prospects ◽  
Hadron Spectroscopy ◽  
Physics Program ◽  
Exotic Hadron

Recent BESIII results on exotic hadron candidates, the heavy charmonium-like states, will be reviewed, as well as a short introductions to the BEPCII collider and the BEESIII detector. Future BESIII running plans, specially the physics program for the exotic hadron spectroscopy, will be discussed.

ON THE STRONG VAN DER WAALS FORCES BETWEEN HADRONS DUE TO CONFINING POTENTIALS

1987 ◽  
Vol 02 (01) ◽  
pp. 265-272 ◽  
Author(s):  
A. O. BARUT ◽  
R. RACZKA
Keyword(s):  
Long Range ◽  
Bound States ◽  
Degrees Of Freedom ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Color Singlet ◽  
Singlet States ◽  
Color Scheme

The problem of long range forces between hadrons is re-examined. Without color degrees of freedom the confining potentials lead to unacceptably large van der Waals forces. The color degrees of freedom are investigated in the case of mesons taking into account both of the color singlet states of four constituents. The consistency of the color scheme requires the existence of four-quark bound states as well as two separate mesons and puts still restrictions on the confining potentials.

scholarly journals CLASSIFICATION OF THE SCALAR MESONS: A STRANGE POLE EXPEDITION INTO CHARM AND BEAUTY TERRITORY

2004 ◽  
Vol 19 (26) ◽  
pp. 1949-1967 ◽  
Author(s):  
EEF VAN BEVEREN ◽  
GEORGE RUPP
Keyword(s):  
Cross Sections ◽  
Bound States ◽  
Bound State ◽  
S Wave ◽  
Exotic Meson ◽  
Scalar Mesons ◽  
S Matrix ◽  
Light Scalar ◽  
Scalar Sector

The classification of scalar and vector mesons is reviewed within the framework of the Resonance-Spectrum Expansion (RSE). This method allows a simple and straightforward description of non-exotic meson–meson scattering, incorporating the effects of quark confinement and OZI-allowed decay in a fully nonperturbative way. Results for resonances and bound states are compared to experiment, on the basis of computed pole positions and cross-sections. New predictions for open-charm and -bottom scalar mesons are presented.Concretely, observed vector states for [Formula: see text] and [Formula: see text] are reproduced, and others are predicted. In the light scalar sector, the now established two nonets, one below 1 GeV and one in the region 1.3–1.5 GeV, are easily described, through the appearance of extra poles in the S-matrix. The recently found [Formula: see text](2317) meson is accurately reproduced by the same mechanism, as a quasi-bound state in the coupled [Formula: see text] system.In S-wave Dπ and Bπ scattering, new resonances are foreseen close to threshold, i.e. a [Formula: see text] at 2.16±0.05 GeV some 250 MeV wide, and a [Formula: see text] at 5.47±0.05 GeV with a width of about 50 MeV. Additional predictions concern the existence of [Formula: see text] and [Formula: see text] scalar mesons, stable with respect to OZI-allowed decay to BK and BD, respectively, namely at 5.61±0.05 GeV resp. 6.64±0.05 GeV.

scholarly journals Coupling Hadron-Hadron Thresholds within a Chiral Quark Model Approach

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 279
Author(s):  
Pablo G. Ortega ◽  
David R. Entem
Keyword(s):  
Quark Model ◽  
Heavy Meson ◽  
Past Century ◽  
Chiral Quark Model ◽  
Hadron Spectroscopy ◽  
Decay Properties ◽  
Heavy Hadron ◽  
The Masses ◽  
Meson States ◽  
Special Relevance

Heavy hadron spectroscopy was well understood within the naive quark model until the end of the past century. However, in 2003, the X(3872) was discovered, with puzzling properties difficult to understand in the simple naive quark model picture. This state made clear that excited states of heavy mesons should be coupled to two-meson states in order to understand not only the masses but, in some cases, unexpected decay properties. In this work, we will give an overview of a way in which the naive quark model can be complemented with the coupling to two hadron thresholds. This program has been already applied to the heavy meson spectrum with the chiral quark model, and we show some examples where thresholds are of special relevance.

scholarly journals THE CHARMED STRANGE MESON SYSTEM

2003 ◽  
Vol 18 (39) ◽  
pp. 2837-2847 ◽  
Author(s):  
WOLFGANG LUCHA ◽  
FRANZ F. SCHÖBERL
Keyword(s):  
Strange Quark ◽  
Bound States ◽  
Energy Levels ◽  
Strange Meson ◽  
New States ◽  
Simple Quark Model ◽  
Meson States ◽  
Meson System ◽  
Surprising Discovery ◽  
Model Approach

Motivated by the recent surprising discovery of two new meson states with [Formula: see text] quark content but unexpectedly low masses and narrow total decay widths, we work out, in a nonrelativistic potential-model approach developed already some two decades ago, the predictions for the energy levels of the corresponding charm–anti-strange quark bound states. In spite of the fact that this simple quark model reproduces the mass spectrum of the previously observed hadrons remarkably well, we are led to the conclusion that, without considerable modifications, both the new states do not fit into this framework.

SPIN-PARITY ANALYSIS OF THE f1(1285)π± SYSTEM

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 178-180
Author(s):  
◽  
KIHYEON CHO
Keyword(s):  
Partial Wave ◽  
Partial Wave Analysis ◽  
Wave Analysis ◽  
Fixed Target ◽  
Exotic Meson ◽  
Spin Parity ◽  
Using Data ◽  
Meson States

Using data which had been taken at E831/FOCUS experiment during the Fermilab fixed target run (1996-1997), we have studied the f1(1285)π± system. The reaction is [Formula: see text] and [Formula: see text]. Using partial wave analysis, we have carried out a study of the spin-parity states of f1(1285)π± system including a search for exotic meson states.

Constituent quark model study of exotic meson states

2014 ◽  
Vol 29 ◽  
pp. 1460227 ◽  
Author(s):  
Youchang Yang ◽  
Jialun Ping ◽  
Chengrong Deng ◽  
Meng Wan
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Constituent Quark ◽  
Expansion Method ◽  
Constituent Quark Model ◽  
Babar Collaboration ◽  
Exotic Meson ◽  
Exotic States ◽  
Model Study ◽  
Meson States

Using high precision numerical method based on Gaussian expansion method for few-body systems, we studied the spectra of possible exotic meson states composed of [Formula: see text] (Q = c, b, and q = u, d, s) in non-relativistic constituent quark model. Some newly released experimental data by the BES, Belle, BaBar Collaboration can be interpreted in our calculation. Several possible exotic states are also predicted.

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