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High Energy Physics - Lattice

arXiv:hep-lat/0506013 (hep-lat)
[Submitted on 10 Jun 2005 (v1), last revised 9 Mar 2006 (this version, v3)]

Title:I=2 pi-pi Scattering from Fully-Dynamical Mixed-Action Lattice QCD

Authors:Silas R. Beane, Paulo F. Bedaque, Kostas Orginos, Martin J. Savage
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Abstract: We compute the I=2 pi-pi scattering length at pion masses of m_pi ~ 294, 348 and 484 MeV in fully-dynamical lattice QCD using Luscher's finite-volume method. The calculation is performed with domain-wall valence-quark propagators on asqtad-improved MILC configurations with staggered sea quarks at a single lattice spacing, b ~ 0.125 fm. Chiral perturbation theory is used to perform the extrapolation of the scattering length from lattice quark masses down to the physical value, and we find m_pi a_2 = -0.0426 +- 0.0006 +- 0.0003 +- 0.0018, in good agreement with experiment. The I=2 pi-pi scattering phase shift is calculated to be delta = -43 +- 10 +- 5 degrees at |p| ~ 544 MeV for m_pi ~ 484 MeV.
Comments: 16 pages, 4 figures
Subjects: High Energy Physics - Lattice (hep-lat); High Energy Physics - Phenomenology (hep-ph); Nuclear Theory (nucl-th)
Cite as: arXiv:hep-lat/0506013
  (or arXiv:hep-lat/0506013v3 for this version)
  https://doi.org/10.48550/arXiv.hep-lat/0506013
Journal reference: Phys.Rev.D73:054503,2006
Related DOI: https://doi.org/10.1103/PhysRevD.73.054503

Submission history

From: Silas Beane [view email]
[v1] Fri, 10 Jun 2005 18:16:17 UTC (481 KB)
[v2] Sat, 11 Jun 2005 20:50:09 UTC (482 KB)
[v3] Thu, 9 Mar 2006 17:08:46 UTC (485 KB)
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