منابع مشابه
The ππ S - wave scattering lengths July 11 , 2000
We match the known chiral perturbation theory representation of the ππ scattering amplitude to two loops with a phenomenological description that relies on the Roy equations. On this basis, the corrections to Wein-berg's low energy theorems for the S-wave scattering lengths are worked out to second order in the expansion in powers of the quark masses. The resulting predictions, a 0 0 = 0.220 ± ...
متن کاملThe ππ S - wave scattering lengths July 24 , 2000
We match the known chiral perturbation theory representation of the ππ scattering amplitude to two loops with a phenomenological description that relies on the Roy equations. On this basis, the corrections to Wein-berg's low energy theorems for the S-wave scattering lengths are worked out to second order in the expansion in powers of the quark masses. The resulting predictions, a 0 0 = 0.220 ± ...
متن کاملππ–scattering lengths at O(p6) revisited
This article completes a former work where part of the O(p6) low-energy constants entering in the ππ scattering were estimated. Some resonance contributions were missed in former calculations and appreciable differences appeared with respect to our outcome. Here, we provide the full results for all the contributing O(p6) couplings. We also perform a reanalysis of the hadronic inputs used for th...
متن کاملs - wave scattering lengths of the strongly dipolar bosons
Yijun Tang,1,2 Andrew Sykes,3 Nathaniel Q. Burdick,2,4 John L. Bohn,3 and Benjamin L. Lev1,2,4 1Department of Physics, Stanford University, Stanford, California 94305, USA 2E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA 3JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309, USA 4Department of Applied Physics, St...
متن کاملScattering Lengths and Medium and High Energy ππ Scattering
Medium and high energy absorptive parts contribute to dispersive expressions for Dwave scattering lengths, a2 and a 2 2. For the model employed by Basdevant, Frogatt and Peterson we find the Dwave driving term contributions to the Dwave scattering lengths are 1.8 · 10−4 to a2 and 0.4 · 10 −4 to a2, roughly 10% and 30% of their respective central experimental values. Inequivalent sets of sum rul...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2000
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(00)00898-4