scholarly journals SCALING RELATION FOR THE $\Upsilon (4S)\to B\bar{B}$ AND $\psi (3770)\to D\bar{D}$ DECAY CONSTANTS FROM PHENOMENOLOGICAL SUM RULES

1995 ◽  
Vol 10 (28) ◽  
pp. 2113-2123 ◽  
Author(s):  
V.V. KISELEV
Keyword(s):  
Sum Rules ◽  
Heavy Meson ◽  
Scaling Relation ◽  
Coupling Constant ◽  
Exclusive Production ◽  
Decay Constants ◽  
Meson Coupling ◽  
Decay Widths ◽  
Heavy Quark Limit ◽  
Pair Contribution

The sum rules for exclusive production of heavy meson pairs in e+e− annihilation are used to evaluate the [Formula: see text] and [Formula: see text] decay widths. Infinitely heavy quark limit is discussed, and the scaling relation for the quarkonium-meson coupling constant is derived. The [Formula: see text] pair contribution into the leptonic constant fϒ(4S) is estimated.

scholarly journals Heavy-meson decay constants from QCD sum rules

2010 ◽  
Author(s):  
Wolfgang Lucha ◽  
Dmitri Melikhov ◽  
Silvano Simula ◽  
Leonardo Angelini ◽  
Pietro Colangelo ◽  
...  
Keyword(s):  
Sum Rules ◽  
Heavy Meson ◽  
Meson Decay ◽  
Qcd Sum Rules ◽  
Decay Constants

scholarly journals Heavy-Meson Decay Constants: Isospin Breaking from QCD Sum Rules

2017 ◽  
Vol 137 ◽  
pp. 06017
Author(s):  
Wolfgang Lucha ◽  
Dmitri Melikhov ◽  
Silvano Simula
Keyword(s):  
Sum Rules ◽  
Heavy Meson ◽  
Meson Decay ◽  
Isospin Breaking ◽  
Qcd Sum Rules ◽  
Decay Constants

LEPTONIC DECAY WIDTHS OF VECTOR MESONS IN A RELATIVISTIC POTENTIAL MODEL

2014 ◽  
Vol 92 (5) ◽  
Author(s):  
S.N. Jena ◽  
R.N. Mishra ◽  
P.K. Nanda ◽  
S. Sahoo
Keyword(s):  
Potential Model ◽  
Transition Probability ◽  
Center Of Mass ◽  
Heavy Meson ◽  
Leptonic Decay ◽  
Vector Mesons ◽  
Electromagnetic Decay ◽  
Decay Constants ◽  
Decay Widths ◽  
Experimental Values

Leptonic decay widths and the corresponding decay constants of neutral vector mesons are calculated in the framework of a square-root potential model of independent quarks. Starting with the assumption that a strong correlation exists between the momenta of the quark and anti-quark inside the meson so as to have their total momenta identically zero in the center-of-mass frame of the meson, we find the quark and anti-quark momentum distribution amplitude which is used to determine the transition probability amplitude for the leptonic decay of mesons. The calculated results for leptonic decay widths and the electromagnetic decay constants for the vector mesons \rho, \omega, \phi and \psi are in good agrement with the corresponding experimental values. The results for the heavy meson \Upsilon are somewhat lower than the experimental values.

scholarly journals New heavy quark limit sum rules involving Isgur-Wise functions and decay constants

1996 ◽  
Vol 387 (3) ◽  
pp. 582-592 ◽  
Author(s):  
A. Le Yaouanc ◽  
L. Oliver ◽  
O. Pène ◽  
J.-C. Raynal
Keyword(s):  
Heavy Quark ◽  
Sum Rules ◽  
Decay Constants ◽  
Heavy Quark Limit

B and D meson coupling constant and form factor calculations from QCD sum rules

2001 ◽  
Author(s):  
M. E. Bracco ◽  
F. S. Navarra ◽  
M. Nielsen ◽  
M. Chiapparini ◽  
C. L. Schat
Keyword(s):  
Form Factor ◽  
Sum Rules ◽  
D Meson ◽  
Coupling Constant ◽  
Qcd Sum Rules ◽  
Meson Coupling

scholarly journals Meson Supermultiplet Decay Constants

1995 ◽  
Vol 48 (1) ◽  
pp. 55
Author(s):  
NR Jones ◽  
R Delbourgo
Keyword(s):  
Heavy Quark ◽  
Radiative Decays ◽  
Meson Decay ◽  
Coupling Constant ◽  
Diverse Range ◽  
Decay Constants ◽  
Decay Widths

We use a covariant supermultiplet theory to determine the primary coupling constant associated with several types of two-body meson decay. Despite the diverse range of decays considered, the primary coupling constant is surprisingly uniform. We envisage the extension of the techniques to heavy quark cases, including as preliminary examples the calculation of the D*+ and D*o total decay widths with results 57 �7�1�5 keY and 42�5�2�6 keY respectively, as well as some predictions about D� and B* radiative decays.

scholarly journals THE EFFECT OF Bπ CONTINUUM IN THE QCD SUM RULES FOR THE (0+,1+) HEAVY MESON DOUBLET IN HQET

1999 ◽  
Vol 14 (34) ◽  
pp. 2367-2377 ◽  
Author(s):  
SHI-LIN ZHU ◽  
YUAN-BEN DAI
Keyword(s):  
Binding Energy ◽  
Sum Rules ◽  
Heavy Meson ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Leading Order ◽  
Coupling Constant ◽  
Sum Rule ◽  
Energy Formula ◽  
Rule Analysis

We study the effect of Bπ continuum in the QCD sum rule analysis of the heavy meson doublet (0+,1+) in the leading order of heavy quark effective theory. New sum rules are derived for the leading order binding energy [Formula: see text] and pionic coupling constant g′.

scholarly journals The D∗Dπ and B∗Bπ couplings from light-cone sum rules

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Alexander Khodjamirian ◽  
Blaženka Melić ◽  
Yu-Ming Wang ◽  
Yan-Bing Wei
Keyword(s):  
Correlation Function ◽  
Lattice Qcd ◽  
Light Cone ◽  
Sum Rules ◽  
Analytical Form ◽  
Operator Product ◽  
Decay Constants ◽  
Meson Coupling ◽  
Double Dispersion ◽  
First Time

Abstract We revisit the calculation of the strong couplings D∗Dπ and B∗Bπ from the QCD light-cone sum rules using the pion light-cone distribution amplitudes. The accuracy of the correlation function, calculated from the operator product expansion near the light-cone, is upgraded by taking into account the gluon radiative corrections to the twist-3 terms. The double spectral density of the correlation function, including the twist-2, 3 terms at $$ \mathcal{O}\left({\alpha}_s\right) $$ O α s and the twist-4 LO terms, is presented in an analytical form for the first time. This form allows us to use various versions of the quark-hadron duality regions in the double dispersion relation underlying the sum rules. We predict $$ {g}_{D^{\ast } D\pi}={14.1}_{-1.2}^{+1.3} $$ g D ∗ Dπ = 14.1 − 1.2 + 1.3 and $$ {g}_{B^{\ast } B\pi}={30.0}_{-2.4}^{+2.6} $$ g B ∗ Bπ = 30.0 − 2.4 + 2.6 when the decay constants of heavy mesons entering the light-cone sum rule are taken from lattice QCD results. We compare our results with the experimental value for the charmed meson coupling and with the lattice QCD calculations.

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