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arXiv · 1011.6352

The phase-shift of isospin-2 pi-pi scattering from lattice QCD

Jozef J. Dudek·Robert G. Edwards·Michael J. Peardon·David G. Richards·Christopher E. Thomas
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Abstract

Finite-volume lattice QCD calculations offer the possibility of extracting resonance parameters from the energy-dependent elastic phase-shift computed using the Luescher technique. In this letter, as a trial of the method, we report on the extraction of the non-resonant phase-shift for S and D-wave pi-pi isospin-2 scattering from dynamical lattice QCD computations. We define a variational basis of operators resembling pairs of pions of definite relative momentum and extract a spectrum of excited states that maps to phase-shifts at a set of discrete scattering momenta. Computations are performed with pion masses between 400 and 520 MeV on multiple spatial volumes. We observe no significant quark mass dependence in the phase-shifts extracted which are in reasonable agreement with the available experimental data at low momentum.

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Jozef J. Dudek, Robert G. Edwards, Michael J. Peardon, David G. Richards, Christopher E. Thomas. 2011-05-10. The phase-shift of isospin-2 pi-pi scattering from lattice QCD. https://doi.org/10.1103/physrevd.83.071504

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