scholarly journals SPECTROSCOPY OF PENTAQUARK BARYONS

2006 ◽  
Vol 21 (04) ◽  
pp. 807-812
Author(s):  
MAKOTO OKA
Keyword(s):  
Lattice Qcd ◽  
Quark Model ◽  
Model Prediction ◽  
Sum Rules ◽  
Direct Application ◽  
Qcd Sum Rules ◽  
Quark Models

A review is given to pentaquark mass predictions in quark models and QCD. It is pointed out that no successful quark model prediction is available for low-lying pentaquark states. Some new results of direct application of QCD, QCD sum rules and lattice QCD, are also presented.

Uraltsev's and other sum rules, theory and phenomenology of D**'s

2015 ◽  
Vol 30 (10) ◽  
pp. 1543009 ◽  
Author(s):  
Alain Le Yaouanc ◽  
Olivier Pène
Keyword(s):  
Lattice Qcd ◽  
Quark Model ◽  
Sum Rules ◽  
Experimental Situation ◽  
Semileptonic Decays ◽  
Physical Situation ◽  
Mass Limit ◽  
Quark Masses ◽  
Infinite Mass ◽  
Quark Models

We first discuss Uraltsev's and other sum rules constraining the B → D**(L = 1) weak transitions in the infinite mass limit, and compare them with dynamical approaches in the same limit. After recalling these well established facts, we discuss how to apply infinite mass limit to the physical situation. We provide predictions concerning semileptonic decays and non-leptonic ones, based on quark models. We then present in more detail the dynamical approaches: the relativistic quark model à la Bakamjian–Thomas and lattice QCD. We summarise lattice QCD results in the infinite mass limit and compare them to the quark model predictions. We then present preliminary lattice QCD results with finite b and c quark masses. A systematic comparison between theory and experiment is performed. We show that some large discrepancies exist between different experiments. Altogether the predictions at infinite mass are in fair agreement with experiment for non-leptonic decays contrary to what happens for semileptonic decays. We conclude by considering the prospects to clarify both the experimental situation, the theoretical one and the comparison between both.

scholarly journals Update on ɛK with lattice QCD inputs

2018 ◽  
Vol 175 ◽  
pp. 14015 ◽  
Author(s):  
Yong-Chull Jang ◽  
Weonjong Lee ◽  
Sunkyu Lee ◽  
Jaehoon Leem
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Lattice Qcd ◽  
Heavy Quark ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Neutral Kaons ◽  
The Standard Model

We report updated results for ɛK, the indirect CP violation parameter in neutral kaons, which is evaluated directly from the standard model with lattice QCD inputs. We use lattice QCD inputs to fix [see formula in PDF], and mc(mc). Since Lattice 2016, the UTfit group has updated the Wolfenstein parameters in the angle-only-fit method, and the HFLAV group has also updated |Vcb|. Our results show that the evaluation of ɛK with exclusive |Vcb| (lattice QCD inputs) has 4.0σ tension with the experimental value, while that with inclusive |Vcb| (heavy quark expansion based on OPE and QCD sum rules) shows no tension.

scholarly journals Magnetic Moments of 70-Plet Baryons in Quark Model and QCD Sum Rules

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
T. M. Aliev ◽  
V. S. Zamiralov
Keyword(s):  
Quark Model ◽  
Sum Rules ◽  
Magnetic Moments ◽  
Positive Parity ◽  
Qcd Sum Rules ◽  
Unitary Symmetry ◽  
Nonrelativistic Quark Model ◽  
Octet Baryons

Magnetic moments of the positive parity 70-plet baryons are estimated in the framework of the nonrelativistic quark model and QCD sum rules method. It is found that the magnetic moments of the 70-plet baryons can be expressed in terms of theFandDcouplings and exhibit unitary symmetry. The QCD sum rules for the magnetic moments of the 70-plet octet baryons are formulated. A comparison of our results on magnetic moments of 56-plet and 70-plet baryons predicted from QCD sum rules is presented.

scholarly journals THE PHYSICS OF GLUEBALLS

2009 ◽  
Vol 18 (01) ◽  
pp. 1-49 ◽  
Author(s):  
VINCENT MATHIEU ◽  
NIKOLAI KOCHELEV ◽  
VICENTE VENTO
Keyword(s):  
Lattice Qcd ◽  
Gauge Field ◽  
Quark Gluon Plasma ◽  
Degrees Of Freedom ◽  
Sum Rules ◽  
Dominant Role ◽  
Gluon Plasma ◽  
Qcd Sum Rules ◽  
Technical Developments

Glueballs are particles whose valence degrees of freedom are gluons and therefore in their description the gauge field plays a dominant role. We review recent results in the physics of glueballs with the aim set on phenomenology and discuss the possibility of finding them in conventional hadronic experiments and in the Quark Gluon Plasma. In order to describe their properties we resort to a variety of theoretical treatments which include, lattice QCD, constituent models, AdS/QCD methods, and QCD sum rules. The review is supposed to be an informed guide to the literature. Therefore, we do not discuss in detail technical developments but refer the reader to the appropriate references.

THE STRONG COUPLING CONSTANTS gDs1D*K AND $g_{D_{s1}D^{*}K_0^{*}}$ IN QCD SUM RULES

2012 ◽  
Vol 27 (05) ◽  
pp. 1250022
Author(s):  
N. GHAHRAMANY ◽  
R. KHOSRAVI ◽  
M. JANBAZI
Keyword(s):  
Quark Model ◽  
Strong Coupling ◽  
Experimental Measurement ◽  
Sum Rules ◽  
Form Factors ◽  
Strong Form ◽  
Coupling Constants ◽  
Qcd Sum Rules

The structure of the Ds1(2460) meson has not yet been exactly known in the quark model. Considering the Ds1 meson as a conventional [Formula: see text] meson, we investigate the strong form factors and coupling constants gDs1D*K and [Formula: see text] in the framework of the three point QCD sum rules. Any future experimental measurement on these form factors as well as coupling constants gDs1D*K and [Formula: see text] and their comparison with the obtained results in the present work can give considerable information about the structure of this meson.

scholarly journals The gauge invariant quark correlator in QCD sum rules and lattice QCD

2000 ◽  
Vol 2000 (07) ◽  
pp. 023-023 ◽  
Author(s):  
Hans Günter Dosch ◽  
Markus Eidemüller ◽  
Matthias Jamin ◽  
Enrico Meggiolaro
Keyword(s):  
Lattice Qcd ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Gauge Invariant
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