scholarly journals Extended nonlocal chiral-quark model for theD- andB-meson weak-decay constants

2012 ◽  
Vol 85 (3) ◽  
Author(s):  
Seung-il Nam
Keyword(s):  
Quark Model ◽  
Weak Decay ◽  
Chiral Quark Model ◽  
Decay Constants ◽  
Meson Weak Decay

scholarly journals HEAVY PSEUDOSCALAR-MESON DECAY CONSTANTS WITH STRANGENESS FROM THE EXTENDED NONLOCAL CHIRAL-QUARK MODEL

2012 ◽  
Vol 27 (27) ◽  
pp. 1250153 ◽  
Author(s):  
SEUNG-IL NAM
Keyword(s):  
Heavy Quark ◽  
Quark Model ◽  
Weak Decay ◽  
Heavy Meson ◽  
Effective Field ◽  
Numerical Results ◽  
Meson Decay ◽  
Chiral Quark Model ◽  
Decay Constants ◽  
Pseudoscalar Mesons

We study the weak-decay constants for the heavy pseudoscalar mesons, D, Ds, B and Bs. For this purpose, we employ the extended nonlocal chiral-quark model (ExNLChQM), motivated by the heavy-quark effective field theory as well as the instanton-vacuum configuration. In addition to the heavy-quark symmetry and the nonlocal interactions between quarks and pseudoscalar mesons in ExNLChQM, a correction for the strange-quark content inside Ds and Bs is also taken into account and found to be crucial to reproduce the empirical values. From those numerical results, we obtain fD, Ds, B, Bs = (207.53, 262.56, 208.13, 262.39) MeV , which are in good agreement with experimental data and other theoretical estimations. Using those numerical results, we estimate the CKM matrix elements and the Cabibbo angle with the various mesonic and leptonic heavy-meson decay channels, resulting in (|Vcd|, |Vcs|, |Vub|, |Vtd|/|Vts|) = (0.224, 0.968, <5.395×10-3, 0.215) and θC = 12.36° which are well compatible with available data.

scholarly journals Chiral Lagrangian and chiral quark model from confinement in QCD

2016 ◽  
Vol 31 (18) ◽  
pp. 1650104 ◽  
Author(s):  
Yu. A. Simonov
Keyword(s):  
Quark Model ◽  
Low Energy ◽  
Chiral Quark Model ◽  
Local Form ◽  
Simple Consequence ◽  
Chiral Perturbation ◽  
Decay Constants ◽  
Quark Decay ◽  
Good Agreement ◽  
Chiral Lagrangian

The effective chiral Lagrangian in both nonlocal form [Formula: see text] and standard local form [Formula: see text], derived in the vacuum correlator formalism in QCD, is studied in the chiral perturbation theory. It is shown, that all coefficients of [Formula: see text] can be computed via [Formula: see text] Green’s functions. In the [Formula: see text] order of [Formula: see text] one obtains GOR relations and quark decay constants [Formula: see text] are calculated [Formula: see text], while in the [Formula: see text] order the coefficients [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] are obtained in good agreement with the values given by data. The chiral quark model is shown to be a simple consequence of [Formula: see text] with defined coefficients. It is demonstrated that [Formula: see text] gives an extension of the limiting low-energy Lagrangian [Formula: see text] to arbitrary momenta.

scholarly journals MESON DECAY IN AN INDEPENDENT QUARK MODEL

2000 ◽  
Vol 09 (05) ◽  
pp. 407-415 ◽  
Author(s):  
HAKAN CİFTCİ ◽  
HÜSEYIN KORU
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Weak Decay ◽  
Leptonic Decay ◽  
Meson Decay ◽  
Decay Constants ◽  
Pseudoscalar Mesons ◽  
Light Vector ◽  
Decay Widths ◽  
Good Agreement

Leptonic decay widths and leptonic decay constants of light vector mesons and weak leptonic decay widths and weak decay constants of light and heavy pseudoscalar mesons have been studied in a field-theoretic framework based on the independent quark model with a scalar-vector power-law potential. The results are in very good agreement with the experimental data.

scholarly journals PION PROPERTIES AT FINITE DENSITY

2009 ◽  
Vol 24 (11n13) ◽  
pp. 891-894
Author(s):  
SEUNG-IL NAM ◽  
HYUN-CHUL KIM
Keyword(s):  
Quark Model ◽  
Recent Work ◽  
Decay Constant ◽  
Chemical Potential ◽  
Lorentz Invariance ◽  
Pion Mass ◽  
Weak Decay ◽  
Chiral Quark Model ◽  
Time And Space ◽  
Finite Density

In this talk, we report our recent work on the pion weak decay constant (Fπ) and pion mass (mπ) using the nonlocal chiral quark model with the finite quark-number chemical potential (μ) taken into account. Considering the breakdown of Lorentz invariance at finite density, the time and space components are computed separately, and the corresponding results turn out to be: [Formula: see text] and [Formula: see text] at μc ≈ 320 MeV , respectively. Using the in-medium Gell-Mann-Oakes-Renner (GOR) relation, we show that the pion mass increases by about 15% at μc.

scholarly journals sQq¯q¯ ( q=u , d ; Q=c , b ) tetraquarks in the chiral quark model

2021 ◽  
Vol 103 (7) ◽  
Author(s):  
Gang Yang ◽  
Jialun Ping ◽  
Jorge Segovia
Keyword(s):  
Quark Model ◽  
Chiral Quark Model

scholarly journals The Genuine Resonance of Full-Charm Tetraquarks

Universe ◽  
2021 ◽  
Vol 7 (5) ◽  
pp. 155
Author(s):  
Xiaoyun Chen
Keyword(s):  
Quark Model ◽  
Bound States ◽  
Expansion Method ◽  
Chiral Quark Model ◽  
Stabilization Method ◽  
Scaling Method ◽  
Resonance States ◽  
Gaussian Expansion Method ◽  
Color Structure ◽  
Quantum Numbers

In this work, the genuine resonance states of full-charm tetraquark systems with quantum numbers JPC=0++,1+−,2++ are searched in a nonrelativistic chiral quark model with the help of the Gaussian Expansion Method. In this calculation, two structures, meson-meson and diquark–antidiquark, as well as their mixing with all possible color-spin configurations, are considered. The results show that no bound states can be formed. However, resonances are possible because of the color structure. The genuine resonances are identified by the stabilization method (real scaling method). Several resonances for the full-charm system are proposed, and some of them are reasonable candidates for the full-charm states recently reported by LHCb.

scholarly journals Structure of pentaquarks Pc+ in the chiral quark model

2017 ◽  
Vol 95 (1) ◽  
Author(s):  
Gang Yang ◽  
Jialun Ping ◽  
Fan Wang
Keyword(s):  
Quark Model ◽  
Chiral Quark Model
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