Abstract
We have computed the SU(2) Low Energy Constant l5 and the mass splitting between charged and neutral pions from a lattice QCD simulation of nf = 2 + 1 flavors of Domain Wall Fermions at a scale of a-1 = 2.33GeV. Relating l5 to the S parameter in QCD we obtain a value of S(mH=120GeV) = 0.42(7), in agreement with previous determinations. Our result can be compared with the value of S from electroweak precision data which constrains strongly interacting models of new physics like Technicolor. This work in QCD serves as a test for the methods to compute the S parameter with Domain Wall Fermions in theories beyond the Standard Model. We also infer a value for the pion mass splitting in agreement with experiment.
Original language | English |
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Pages (from-to) | - |
Number of pages | 8 |
Journal | Physical Review D |
Volume | 81 |
Issue number | 1 |
DOIs | |
Publication status | Published - 14 Jan 2010 |
Keywords / Materials (for Non-textual outputs)
- hep-lat