scholarly journals Weak decay constant of pseudoscalar mesons in a QCD-inspired model

2004 ◽  
Vol 34 (1a) ◽  
pp. 297-299 ◽  
Author(s):  
L. A. M. Salcedo ◽  
J.P.B.C. de Melo ◽  
D. Hadjmichef ◽  
T. Frederico
Keyword(s):  
Decay Constant ◽  
Weak Decay ◽  
Pseudoscalar Mesons ◽  
Qcd Inspired Model

scholarly journals Electromagnetic structure and weak decay of pseudoscalar mesons in a light-front QCD-inspired model

2006 ◽  
Vol 27 (2) ◽  
pp. 213-223 ◽  
Author(s):  
L. A. M. Salcedo ◽  
J. P. B. C. de Melo ◽  
D. Hadjimichef ◽  
T. Frederico
Keyword(s):  
Weak Decay ◽  
Light Front ◽  
Electromagnetic Structure ◽  
Pseudoscalar Mesons ◽  
Qcd Inspired Model

Remarks on broken chiral SU(5) × SU(5) symmetry and B mesons

1985 ◽  
Vol 63 (10) ◽  
pp. 1294-1298
Author(s):  
D. Y. Kim ◽  
S. N. Sinha
Keyword(s):  
B Mesons ◽  
Decay Constant ◽  
B Meson ◽  
Weak Decay ◽  
Sum Rule ◽  
Decay Constants ◽  
Symmetry Approach ◽  
Rule Model ◽  
Pseudoscalar Mesons ◽  
The Masses

In a recent paper, Hatzis has estimated the masses and weak decay constants of b-flavored pseudoscalar mesons in a broken chiral SU(5) × SU(5) symmetry method. The estimated weak decay constant of B meson, [Formula: see text], however, does not agree with the value [Formula: see text] evaluated by Mathur et al. with the quantum chromodynamics (QCD) sum-rule model. We re-examined the problem applying the broken chiral SU(5) × SU(5) symmetry approach using a set of mass formulae. With this method we estimate the symmetry-breaking parameters and decay constants of pseudoscalar mesons. We found a consistent result for the decay constant: [Formula: see text]. The explicit numerical value of these constants, however, are lower than that of the QCD sum rule. This may be due to the limited validity of the broken chiral symmetry approach for heavy mesons.

Initial charm program on direct measurements of weak decay constant fDs and branching fraction B(Ds → μνμ) and prospect with high-precision

2020 ◽  
Vol 35 (35) ◽  
pp. 2030018
Author(s):  
C. C. Zhang
Keyword(s):  
High Precision ◽  
Decay Constant ◽  
Branching Fraction ◽  
Branching Fractions ◽  
Weak Decay ◽  
Precision Measurements ◽  
Direct Measurements

First direct measurements of the weak decay constant [Formula: see text] and the [Formula: see text] branching fractions to [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] at the BES experiments in 1990s are reviewed. Referring to the BESIII results of [Formula: see text] and branching fraction [Formula: see text] with best precision1 to date, prospect for challenge on precision measurements of [Formula: see text] and [Formula: see text] at BESIII is presented.

scholarly journals Pion weak decay constant at finite density from the instanton vacuum

2008 ◽  
Vol 666 (4) ◽  
pp. 324-331 ◽  
Author(s):  
Seung-il Nam ◽  
Hyun-Chul Kim
Keyword(s):  
Decay Constant ◽  
Weak Decay ◽  
Finite Density ◽  
Instanton Vacuum

scholarly journals ON THE COMPLEXION OF PSEUDOSCALAR MESONS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1778-1784 ◽  
Author(s):  
A. HÖLL ◽  
A. KRASSNIGG ◽  
C. D. ROBERTS ◽  
S. V. WRIGHT
Keyword(s):  
Quark Mass ◽  
Decay Constant ◽  
Chiral Limit ◽  
Mass Function ◽  
Mass Scale ◽  
Radial Excitation ◽  
Decay Constants ◽  
Pseudoscalar Mesons ◽  
Constituent Quark Mass ◽  
Goldstone Modes

A strongly momentum-dependent dressed-quark mass function is basic to QCD. It is central to the appearance of a constituent-quark mass-scale and an existential prerequisite for Goldstone modes. Dyson-Schwinger equation (DSEs) studies have long emphasised this importance, and have proved that QCD's Goldstone modes are the only pseudoscalar mesons to possess a nonzero leptonic decay constant in the chiral limit when chiral symmetry is dynamically broken, while the decay constants of their radial excitations vanish. Such features are readily illustrated using a rainbow-ladder truncation of the DSEs. In this connection we find (in GeV): fηc(1S)=0.233, mηc(2S)=3.42; and support for interpreting η(1295), η(1470) as the first radial excitations of η(548), η′(958), respectively, and K(1460) as the first radial excitation of the kaon. Moreover, such radial excitations have electromagnetic diameters greater than 2 fm. This exceeds the spatial length of lattices used typically in contemporary lattice-QCD.

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 Electromagnetic structure and weak decay of meson K in a light-front QCD-inspired model

2007 ◽  
Vol 790 (1-4) ◽  
pp. 610c-613c ◽  
Author(s):  
Fabiano P. Pereira ◽  
J.P.B.C. de Melo ◽  
T. Frederico ◽  
Lauro Tomio
Keyword(s):  
Weak Decay ◽  
Light Front ◽  
Electromagnetic Structure ◽  
Qcd Inspired Model

scholarly journals EXCITED PIONS, ρ- AND ω-MESONS AND THEIR DECAYS IN A CHIRAL SU(2) × SU(2) LAGRANGIAN

1998 ◽  
Vol 13 (32) ◽  
pp. 5443-5457 ◽  
Author(s):  
M. K. VOLKOV ◽  
D. EBERT ◽  
M. NAGY
Keyword(s):  
Experimental Data ◽  
Excited State ◽  
Decay Constant ◽  
Three Dimensional ◽  
Form Factors ◽  
Weak Decay ◽  
Wave Functions ◽  
Spontaneous Breaking ◽  
Gap Equation ◽  
Decay Widths

A chiral SU(2) × SU(2) Lagrangian containing, besides the usual meson fields, their first radial excitations is considered. The Lagrangian is derived by bosonization of the Nambu–Jona-Lasinio (NJL) quark model with separable nonlocal interactions, with form factors corresponding to three-dimensional ground and excited state wave functions. The spontaneous breaking of chiral symmetry is governed by the NJL gap equation. The first radial excitations of the pions, ρ-and ω-mesons are described with the help of two form factors. The weak decay constant Fπ′ is calculated. The values for the decay widths of the processes ρ→2π, π′→ρπ, ρ′→2π, ρ′→ωπ and ω′→ρπ are obtained in agreement with the experimental data.

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.

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