scholarly journals Excited heavy baryon spectrum in largeNcheavy quark effective theory

1998 ◽  
Vol 59 (3) ◽  
Author(s):  
Jong-Phil Lee ◽  
Chun Liu ◽  
H. S. Song
Keyword(s):  
Heavy Baryon ◽  
Effective Theory ◽  
Baryon Spectrum

scholarly journals Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks

2021 ◽  
Vol 104 (5) ◽  
Author(s):  
Yonghee Kim ◽  
Yan-Rui Liu ◽  
Makoto Oka ◽  
Kei Suzuki
Keyword(s):  
Heavy Baryon ◽  
Baryon Spectrum

scholarly journals corrections to heavy baryon masses in the heavy quark effective theory sum rules

1996 ◽  
Vol 371 (1-2) ◽  
pp. 99-104 ◽  
Author(s):  
Yuan-ben Dai ◽  
Chao-shang Huang ◽  
Chun Liu ◽  
Cai-dian Lü
Keyword(s):  
Heavy Quark ◽  
Sum Rules ◽  
Heavy Baryon ◽  
Effective Theory ◽  
Heavy Quark Effective Theory

scholarly journals Eta Prime Gluonic Contribution to the Nucleon Self-Energy in an Effective Theory

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
A. Upadhyay ◽  
J. P. Singh
Keyword(s):  
Charge Density ◽  
Topological Charge ◽  
Form Factors ◽  
Heavy Baryon ◽  
Effective Theory ◽  
Nucleon Mass ◽  
Total Contribution ◽  
Self Energy ◽  
Qcd Vacuum ◽  
The One

We estimate a possibleη′gluonic contribution to the self-energy of a nucleon in an effective theory. The couplings of the topological charge density to nucleons give rise to OZI violatingη′-nucleon interactions. The one-loop self-energy of nucleon arising due to these interactions is studied using a heavy baryon chiral perturbation theory. The divergences have been removed using appropriate form factors. The nontrivial structure of the QCD vacuum has also been taken into account. The numerical results are sensitive to the choice of the regulator to a nonnegligible extent. We get the total contribution to the nucleon mass coming from its interaction with the topological charge densityδmtot≅-(2.5–7.5)% of the nucleon mass.

Hadronic molecules in the heavy baryon spectrum

2016 ◽  
Author(s):  
D. R. Entem ◽  
P. G. Ortega ◽  
F. Fernández
Keyword(s):  
Heavy Baryon ◽  
Baryon Spectrum

scholarly journals Lattice Evidence for Bound Heavy Tetraquarks

2019 ◽  
Vol 202 ◽  
pp. 06013
Author(s):  
Anthony Francis ◽  
Renwick J. Hudspith ◽  
Randy Lewis ◽  
Kim Maltman
Keyword(s):  
Quark Mass ◽  
Bound States ◽  
Heavy Baryon ◽  
Binding Energies ◽  
Mass Dependence ◽  
Physical Point ◽  
Charm Quarks ◽  
Baryon Spectrum ◽  
Heavy Quark Mass ◽  
Exotic Hadrons

We investigate the possibility of qq'$ \bar {Q}\bar {Q}' $ tetraquark bound states using nf = 2 + 1 lattice QCD with pion masses ≃ 164, 299 and 415 MeV. Two types of lattice interpolating operator are chosen, reflecting first diquarkantidiquark and second meson-meson structure. Performing variational analysis using these operators and their mixings, we determine the ground and first excited states from the lattice correlators. Using non-relativistic QCD to simulate the bottom quarks and the Tsukuba formulation of relativistic heavy quarks for charm quarks, we study the ud$ \bar {b}\bar {b} $, ℓs$ \bar {b}\bar {b} $ as well as ud$ \bar {c}\bar {b} $, channels with ℓ= u, d. In the case of the ud$ \bar {b}\bar {b} $ and ℓs$ \bar {b}\bar {b} $ channels unambiguous signals for JP=1+ tetraquarks are found with binding energies 189(10) and 98(7) MeV below the corresponding free two-meson thresholds at the physical point. These tetraquarks are therefore strong-interaction stable, implying they are stable under strong as well as electromagnetic interactions while they can decay weakly. So far these are the first exotic hadrons predicted to have this feature. Further evidence for binding is found in the ud$ \bar {c}\bar {b} $ channel, whereby the binding energy broadly straddles the electromagnetic stability threshold. Studying further the quark mass dependence we vary the heavy quark mass in ud$ \bar {Q}\bar {Q} $, ℓs$ \bar {Q}\bar {Q} $ as well as ud$ \bar {Q}\bar {b} $, ℓs$ \bar {Q}\bar {b} $ between roughly 0.7 and 6.3 times the bottom quark mass. The observed mass dependence of these four flavor channels closely follows a behaviour argued from phenomenological considerations of the heavy baryon spectrum.

scholarly journals DISPERSIVE BOUNDS ON THE SHAPE OF $\Lambda_b\to \Lambda_b l\bar{\nu}_l$ FORM FACTORS

1999 ◽  
Vol 14 (15) ◽  
pp. 2385-2395 ◽  
Author(s):  
DEBRUPA CHAKRAVERTY ◽  
TRIPTESH DE ◽  
BINAYAK DUTTA-ROY ◽  
K. S. GUPTA
Keyword(s):  
Experimental Data ◽  
Heavy Quark ◽  
Charge Radius ◽  
Form Factors ◽  
Heavy Baryon ◽  
Dispersion Relations ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Input Information ◽  
Crossing Symmetry

We derive a theoretically allowed domain for the charge radius ρ and the curvature c of the Isgur–Wise function describing the decay [Formula: see text]. Our method uses crossing symmetry, dispersion relations and analyticity in the context of the heavy quark effective theory (HQET), but is independent of the specifics of any given model. The experimentally determined values of the ϒ masses have been used as input information. The results are of interest for testing different models employed to calculate the heavy baryon form factors which are used for the extraction of |Vcb| from experimental data.

POSSIBLE MOLECULAR STRUCTURES IN THE HEAVY BARYON SPECTRUM

2014 ◽  
Vol 26 ◽  
pp. 1460123
Author(s):  
D. R. ENTEM ◽  
P. G. ORTEGA ◽  
F. FERNÁNDEZ
Keyword(s):  
Experimental Data ◽  
Bound States ◽  
Constituent Quark ◽  
Heavy Baryon ◽  
Bound State ◽  
Constituent Quark Model ◽  
Molecular Structures ◽  
Baryon Spectrum ◽  
Small Binding Energy ◽  
Bottom Baryon

We use a chiral constituent quark model to study possible molecular structures in the heavy baryon spectrum. We first analyze D*N states and we find a bound state in the JP = 3/2- sector with an small binding energy. This state can be identified with the Λc(2940)+. The decays of this state are compatible with the existent experimental data. As a by product a state is predicted in the bottom baryon spectrum as a [Formula: see text] state with a mass around 6250 MeV. Moreover we also analyze other DN, D*N, DΔ and D*Δ states and their analogs in the bottom baryon sector finding several bound states.

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