Cabibbo Theory, Pole Dominance, and Sum Rules for Radiative Decays of Pseudoscalar Mesons

1969 ◽  
Vol 181 (5) ◽  
pp. 1866-1874 ◽  
Author(s):  
Gerald W. Intemann
Keyword(s):  
Sum Rules ◽  
Radiative Decays ◽  
Pole Dominance ◽  
Pseudoscalar Mesons

scholarly journals SCALAR NONETS IN POLE-DOMINATED QCD SUM RULES

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2230-2233
Author(s):  
TORU KOJO ◽  
DAISUKE JIDO
Keyword(s):  
Operator Product Expansion ◽  
Quark Mass ◽  
Sum Rules ◽  
Operator Product ◽  
Qcd Sum Rules ◽  
Current Quark Mass ◽  
Pole Dominance ◽  
Light Scalar ◽  
Current Quark

The light scalar nonets are studied using the QCD sum rules for the tetraquark operators. The operator product expansion for the correlators is calculated up to dimension 12 and this enables us to perform analyses retaining sufficient pole-dominance. To classify the light scalar nonets, we investigate the dependence on current quark mass and flavor dynamics. Especially, to examine the latter, we study separately SU(3) singlet and octet states, and show that the number of annihilation diagrams is largely responsible for their differences, which is also the case even after the inclusion of the finite quark mass. Our results support the tetraquark picture for isosinglets, while that for octets is not conclusive yet.

scholarly journals THE SECOND MOMENT OF THE STRUCTURE FUNCTION FOR PSEUDOSCALAR MESONS IN QCD SUM RULES

1996 ◽  
Vol 05 (01) ◽  
pp. 121-129
Author(s):  
YOSHINORI NISHINO
Keyword(s):  
Structure Function ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Sum Rule ◽  
Second Moment ◽  
Flavor Structure ◽  
Pseudoscalar Mesons

We calculate the second moment [Formula: see text] of the flavor-singlet structure function [Formula: see text] for the pion and the kaon in the framework of the QCD sum rule, and investigate how the results depend on their flavor structure (quark contents). Our calculations give similar values of [Formula: see text] for these two mesons as a result of the cancellation among several non-small factors.

Superconvergence sum rules for radiative decays of meson resonances

1968 ◽  
Vol 53 (1) ◽  
pp. 187-200 ◽  
Author(s):  
G. Calucci ◽  
C. Verzegnassi
Keyword(s):  
Sum Rules ◽  
Radiative Decays
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