2 research outputs found
The , , and mesons in a double pole QCD Sum Rule
We use the method of double pole QCD sum rule which is basically a fit with
two exponentials of the correlation function, where we can extract the masses
and decay constants of mesons as a function of the Borel mass. We apply this
method to study the mesons: , , and
. We also present predictions for the toponiuns masses
of m(1S)=357 GeV and m(2S)=374 GeV.Comment: 14 pages, 11 figures in Braz J Phys (2016
The pole structure of the unitary, crossing symmetric low energy scattering amplitudes
The pole structure of the low energy scattering amplitudes is
studied using a proper chiral unitarization method combined with crossing
symmetry and the low energy phase shift data. It is found that the
pole position is at , . The
existence of the virtual state pole in the IJ=20 channel is reconfirmed.
Various threshold parameters are estimated and are found in general in good
agreement with the results obtained from the Roy equation analyses.Comment: Minor corrections made and references added. Final version accepted
for publication as JHEP02(2005)04