Zobrazeno 1 - 10
of 483
pro vyhledávání: '"Ericson T"'
Autor:
Ericson, T. E. O.
We discuss the electromagnetic corrections to the pion-nucleon scattering lengths generated by minimal e. m. coupling from a knowledge of the low energy expansion of the pion-nucleon elastic scattering amplitude as well as from the nucleon and delta
Externí odkaz:
http://arxiv.org/abs/hep-ph/0504258
Autor:
Ericson, T. E. O., Ivanov, A. N.
We investigate the dispersive contribution by radiative processes such as (pi- proton to neutron gamma) and (pi- proton to Delta gamma) to the pion-nucleon scattering lengths of charged pions in the heavy baryon limit. They give a large isospin viola
Externí odkaz:
http://arxiv.org/abs/hep-ph/0503277
Publikováno v:
Int.J.Mod.Phys.A20:1650-1655,2005
A model independent expression for the electromagnetic corrections to a phenomenological hadronic pion-nucleon scattering length, extracted from pionic hydrogen, is obtained. In a non-relativistic approach and using an extended charge distribution, t
Externí odkaz:
http://arxiv.org/abs/hep-ph/0411230
We derive a closed, model independent, expression for the electromagnetic correction factor to a phenomenological hadronic scattering length extracted from a hydrogenic atom. It is obtained in a non-relativistic approach and in the limit of a short r
Externí odkaz:
http://arxiv.org/abs/hep-ph/0310134
Publikováno v:
Nucl.Phys.A721:653-656,2003
We derive a closed, model space independent, expression for the electromagnetic correction factor $\delta $ to the scattering length $a$ extracted from a hydrogenic atom with an extended charge to order $\alpha ^2$ and $a^3$ in the limit of a short r
Externí odkaz:
http://arxiv.org/abs/hep-ph/0211433
Publikováno v:
Phys.Rev.C66:014005,2002
We critically evaluate the isovector GMO sum rule for forward pion-nucleon scattering using the recent precision measurements of negatively charged pion-proton and pion-deuteron scattering lengths from pionic atoms. We deduce the charged-pion-nucleon
Externí odkaz:
http://arxiv.org/abs/hep-ph/0009312
Autor:
Loiseau, B., Ericson, T. E. O.
Publikováno v:
Phys.Scripta T87:53-61,2000
The Coulomb-like backward peak of the neutron-proton scattering differential cross section is due to one-pion exchange. Extrapolation to the pion pole of precise data should allow to obtain the value of the charged pion-nucleon coupling constant. Thi
Externí odkaz:
http://arxiv.org/abs/hep-ph/0002085
Publikováno v:
PiN Newslett.15:162-166,1999
The isovector GMO sum rule for zero energy forward pion-nucleon scattering is critically studied to obtain the charged pion-nucleon coupling constant using the precise negatively charged pion-proton and pion-deuteron scattering lengths deduced recent
Externí odkaz:
http://arxiv.org/abs/hep-ph/0002056
Publikováno v:
Nucl.Phys.A663:541-544,2000
We critically evaluate the isovector GMO sumrule for the charged $\pi N N$ coupling constant using recent precision data from $\pi ^-$p and $\pi^-$d atoms and with careful attention to systematic errors. From the $\pi ^-$d scattering length we deduce
Externí odkaz:
http://arxiv.org/abs/hep-ph/9907433
We report here a preliminary value for the piNN coupling constant deduced from the GMO sumrule for forward piN scattering. As in our previous determination from np backward differential scattering cross sections we give a critical discussion of the a
Externí odkaz:
http://arxiv.org/abs/hep-ph/9811515