scholarly journals Distribution amplitudes of heavy mesons and quarkonia on the light front

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Fernando E. Serna ◽  
Roberto Correa da Silveira ◽  
J. J. Cobos-Martínez ◽  
Bruno El-Bennich ◽  
Eduardo Rojas
Keyword(s):  
Heavy Quark ◽  
Pion Mass ◽  
Heavy Meson ◽  
Light Front ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Decay Constants ◽  
Quark Sector ◽  
Pseudoscalar Mesons ◽  
Inverse Moment

AbstractThe ladder kernel of the Bethe–Salpeter equation is amended by introducing a different flavor dependence of the dressing functions in the heavy-quark sector. Compared with earlier work this allows for the simultaneous calculation of the mass spectrum and leptonic decay constants of light pseudoscalar mesons, the $$D_u$$ D u , $$D_s$$ D s , $$B_u$$ B u , $$B_s$$ B s and $$B_c$$ B c mesons and the heavy quarkonia $$\eta _c$$ η c and $$\eta _b$$ η b within the same framework at a physical pion mass. The corresponding Bethe–Salpeter amplitudes are projected onto the light front and we reconstruct the distribution amplitudes of the mesons in the full theory. A comparison with the first inverse moment of the heavy meson distribution amplitude in heavy quark effective theory is made.

scholarly journals Light-front heavy-quark effective theory and heavy-meson bound states

1995 ◽  
Vol 52 (5) ◽  
pp. 2915-2925 ◽  
Author(s):  
Chi-Yee Cheung ◽  
Wei-Min Zhang ◽  
Guey-Lin Lin
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Heavy Meson ◽  
Light Front ◽  
Effective Theory ◽  
Heavy Quark Effective Theory

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 NONPERTURBATIVE HQET AT ORDER 1/m

2010 ◽  
Vol 19 (08n10) ◽  
pp. 1661-1666
Author(s):  
B. BLOSSIER ◽  
G. VON HIPPEL ◽  
N. GARRON ◽  
T. MENDES
Keyword(s):  
Lattice Qcd ◽  
Heavy Quark ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Vector Mesons ◽  
Decay Constants ◽  
First Results ◽  
Pseudo Scalar

We summarize the first results for masses and decay constants of bottom-strange (pseudo-scalar and vector) mesons from nonperturbatively renormalized heavy-quark effective theory (HQET), using lattice-QCD simulations in the quenched approximation.

scholarly journals SPIN ALIGNMENT OF HEAVY MESON REVISITED

2003 ◽  
Vol 18 (08) ◽  
pp. 1351-1356
Author(s):  
J. P. MA
Keyword(s):  
Heavy Quark ◽  
B Meson ◽  
Heavy Meson ◽  
Effective Theory ◽  
Spin Density Matrix ◽  
Complete Agreement ◽  
Heavy Quark Effective Theory ◽  
Matrix Elements ◽  
Spin Alignment ◽  
Nonperturbative Effect

Using heavy quark effective theory a factorized form for inclusive production rate of a heavy meson can be obtained, in which the nonperturbative effect related to the heavy meson can be characterized by matrix elements defined in the heavy quark effective theory. Using this factorization, predictions for the full spin density matrix of a spin-1 and spin-2 meson can be obtained and they are characterized only by one coefficient representing the nonperturbative effect. Predictions for spin-1 heavy meson are compared with experiment performed at e+e- colliders in the energy range from [Formula: see text] to [Formula: see text], a complete agreement is found for D*- and B*-meson. There are distinct differences from the existing approach and they are discussed.

scholarly journals Covariant light-front model of heavy mesons within heavy quark effective theory

1998 ◽  
Vol 57 (9) ◽  
pp. 5598-5610 ◽  
Author(s):  
Hai-Yang Cheng ◽  
Chi-Yee Cheung ◽  
Chien-Wen Hwang ◽  
Wei-Min Zhang
Keyword(s):  
Heavy Quark ◽  
Light Front ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Heavy Mesons ◽  
Front Model

scholarly journals HEAVY QUARK EFFECTIVE THEORY ON THE LIGHT FRONT

1996 ◽  
Vol 11 (18) ◽  
pp. 3297-3305 ◽  
Author(s):  
WEI-MIN ZHANG ◽  
CHI-YEE CHEUNG ◽  
GUEY-LIN LIN
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Canonical Quantization ◽  
Light Front ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
New Formalism ◽  
Heavy Hadron ◽  
Quark Spin ◽  
Simple Operator

The light front heavy quark effective theory is derived to all orders in 1/mQ. In the limit mQ→∞, the theory exhibits the familiar heavy quark spin-flavor symmetry. This new formalism permits a straightforward canonical quantization to all orders in 1/mQ; moreover, higher order terms have rather simple operator structures. The light front heavy quark effective theory can serve as a useful framework for the study of nonperturbative QCD dynamics of heavy hadron bound states.

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