Add to ORKGPositronium annihilation amplitudes that are computed by assuming a factorization approximation with on-shell intermediate leptons, do not exhibit good analytical behavior. We propose an ansatz which allows to include binding energy corrections and obtain the correct analytical and gauge invariance behavior of these QED amplitudes. As a consequence of these non-perturbative corrections, the parapositronium and orthopositronium decay rates receive corrections of order alpha^4 and alpha^2, respectively. These new corrections for orthopositronium are relevant in view of a precise comparison between recent theoretical and experimental developments. Implications are pointed out for analogous decays of quarkonia . Comment: 11 pages, 1 .ps figure...
We present details of our recent calculation of alpha^2 corrections to the parapositronium decay int...
QED gauge invariance, when combined with analyticity, leads to constraints on the low energy end of ...
QED gauge invariance, when combined with analyticity, leads to constraints on the low energy end of ...
Positronium annihilation amplitudes that are computed by assuming a factorization approximation with...
Positronium annihilation amplitudes that are computed by assuming a factorization approximation with...
The construction of positronium decay amplitudes is handled through the use of dispersion relations....
Positronium decay rates are computed at the one-loop level, using convolution-type factorized amplit...
In order to fulfill Low's theorem requirements, a new lowest order basis for bound state decay compu...
In order to fulfill Low's theorem requirements, a new lowest order basis for bound state decay compu...
Order \alpha^2 corrections to the decay rate of orthopositronium arecalculated in the framework of n...
A simple method to compute QED bound state properties is presented, in which binding energy effects ...
A simple method to compute QED bound state properties is presented, in which binding energy effects ...
The logarithmically enhanced alpha^3 ln(1/alpha) corrections to the para- and orthopositronium decay...
Recently, much work has been devoted to the calculation of order $\alpha$ corrections to the decay r...
The logarithmically enhanced alpha^3 ln(1/alpha) corrections to the para- and orthopositronium decay...
We present details of our recent calculation of alpha^2 corrections to the parapositronium decay int...
QED gauge invariance, when combined with analyticity, leads to constraints on the low energy end of ...
QED gauge invariance, when combined with analyticity, leads to constraints on the low energy end of ...
Positronium annihilation amplitudes that are computed by assuming a factorization approximation with...
Positronium annihilation amplitudes that are computed by assuming a factorization approximation with...
The construction of positronium decay amplitudes is handled through the use of dispersion relations....
Positronium decay rates are computed at the one-loop level, using convolution-type factorized amplit...
In order to fulfill Low's theorem requirements, a new lowest order basis for bound state decay compu...
In order to fulfill Low's theorem requirements, a new lowest order basis for bound state decay compu...
Order \alpha^2 corrections to the decay rate of orthopositronium arecalculated in the framework of n...
A simple method to compute QED bound state properties is presented, in which binding energy effects ...
A simple method to compute QED bound state properties is presented, in which binding energy effects ...
The logarithmically enhanced alpha^3 ln(1/alpha) corrections to the para- and orthopositronium decay...
Recently, much work has been devoted to the calculation of order $\alpha$ corrections to the decay r...
The logarithmically enhanced alpha^3 ln(1/alpha) corrections to the para- and orthopositronium decay...
We present details of our recent calculation of alpha^2 corrections to the parapositronium decay int...
QED gauge invariance, when combined with analyticity, leads to constraints on the low energy end of ...
QED gauge invariance, when combined with analyticity, leads to constraints on the low energy end of ...