scholarly journals Some properties of the QQq-quark potential in string models

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Oleg Andreev
Keyword(s):  
String Theory ◽  
Heavy Quark ◽  
Light Quark ◽  
String Tension ◽  
Heavy Quarks ◽  
Theory Construction ◽  
Quark Potential ◽  
String Models ◽  
Parameter Values

Abstract We propose a string theory construction which allows us to study properties of the potential of two heavy quarks coupled to a light quark. In such a case, the potential is a function of separation between the heavy quarks. The results show the universality of the string tension and factorization at small separations expected from heavy quark-diquark symmetry. In addition, we make an estimate of the string breaking distance. With the parameter values we use, this distance is found to be almost the same as that for the heavy quark-antiquark potential. We also discuss the heavy quark-quark potential and its relation to Lipkin rule.

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.

scholarly journals Drag force on heavy quarks and spatial string tension

2018 ◽  
Vol 33 (06) ◽  
pp. 1850041 ◽  
Author(s):  
Oleg Andreev
Keyword(s):  
String Duality ◽  
Drag Coefficient ◽  
Heavy Quark ◽  
Quark Gluon Plasma ◽  
Diffusion Coefficients ◽  
Transport Coefficients ◽  
Gluon Plasma ◽  
String Tension ◽  
Heavy Quarks ◽  
Strongly Coupled

Heavy quark transport coefficients in a strongly coupled Quark–Gluon Plasma can be evaluated using a gauge/string duality and lattice QCD. Via this duality, one can argue that for low momenta the drag coefficient for heavy quarks is proportional to the spatial string tension. Such a tension is well-studied on the lattice that allows one to straightforwardly make non-perturbative estimates of the heavy quark diffusion coefficients near the critical point. The obtained results are consistent with those in the literature.

scholarly journals A Heavy-Light Quark Potential

2017 ◽  
Vol 45 ◽  
pp. 1760054
Author(s):  
Frederico F. Gomes ◽  
Bruna C. Folador ◽  
Dimiter Hadjimichef ◽  
Daniel T. da Silva
Keyword(s):  
Light Quark ◽  
Heavy Quarks ◽  
Exchange Potential ◽  
Gluon Exchange ◽  
Quark Level ◽  
Quark Potential ◽  
Relativistic Reduction

In many studies of meson-baryon interactions with short one gluon exchange potential (OGEP), usually a full non-relativistic reduction, at the quark level Hamiltonian, is performed. In systems like [Formula: see text], light and heavy quarks are present, which in principle would require only a partial non-relativistic reduction. We shal start from a JKJ relativistic quark Hamiltonian and apply a partial non-relativistic reduction in order to obtain a OGEP between heavy and light quarks (heavy-light quark potential).

scholarly journals Effect of back reaction on light quark energy loss in heavy quark cloud

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Zi-qiang Zhang ◽  
De-fu Hou
Keyword(s):  
Energy Loss ◽  
Heavy Quark ◽  
Drag Force ◽  
Light Quark ◽  
Heavy Quarks ◽  
Jet Quenching ◽  
Back Reaction ◽  
Strongly Coupled ◽  
Yang Mills ◽  
Quark Energy Loss

AbstractWe study the effect of back reaction on the energy loss of light quarks in strongly coupled $${\mathcal {N}}=4$$ N = 4 supersymmetric Yang–Mills (SYM) plasma, by using the AdS/CFT correspondence. We perform the analysis within falling string and shooting string approaches, respectively. It is shown that the back reaction, arising from the presence of static heavy quarks uniformly distributed over SYM, enhances the energy loss, in agreement with the findings of the drag force and jet quenching parameter.

scholarly journals The heavy quark potential in two-dimensional QCD with adjoint matter

1995 ◽  
Vol 435 (1-2) ◽  
pp. 241-256 ◽  
Author(s):  
T.H. Hansson ◽  
R. Tzani
Keyword(s):  
Heavy Quark ◽  
Two Dimensional ◽  
Quark Potential ◽  
Heavy Quark Potential

POLARIZED HADRO- AND PHOTOPRODUCTION OF HEAVY QUARKS IN NLO QCD

2003 ◽  
Vol 18 (08) ◽  
pp. 1477-1480
Author(s):  
I. BOJAK
Keyword(s):  
Heavy Quark ◽  
Heavy Quarks ◽  
Gluon Helicity ◽  
Shed Light

We present the first calculation of the complete NLO QCD corrections to the production of heavy flavors with longitudinally polarized hadrons. This reaction can be used at RHIC to extract the gluon helicity density and may shed light on the "heavy quark enigma". The theoretical uncertainties are briefly discussed.

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