https://doi.org/10.1140/epjc/s10052-012-2159-y
Regular Article - Theoretical Physics
Preliminary study of the [InlineEquation not available: see fulltext.] scattering length from lattice QCD
1
Key Laboratory of Radiation Physics and Technology of Education Ministry, Sichuan University, Chengdu, 610064, P.R. China
2
Institute of Nuclear Science and Technology, College Physical Science and Technology, Sichuan University, Chengdu, 610064, P.R. China
* e-mail: fuziwen@scu.edu.cn
Received:
16
January
2012
Revised:
22
August
2012
Published online:
22
September
2012
The s-wave kaon–antikaon ([InlineEquation not available: see fulltext.]) scattering length is studied by lattice QCD using pion masses m π =330–466 MeV. Through wall sources without gauge fixing, we calculate [InlineEquation not available: see fulltext.] four-point functions in the I=1 channel with the “Asqtad”-improved staggered fermion formulation, and observe an attractive signal, which is consistent with pioneering lattice studies on [InlineEquation not available: see fulltext.] potential. Extrapolating the [InlineEquation not available: see fulltext.] scattering length to the physical point, we obtain [InlineEquation not available: see fulltext.], where the first error is statistical and the second is systematic. These simulations are conducted with MILC gauge configurations at lattice spacing a≈0.15 fm.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2012
