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arxiv: 0706.0955 · v2 · submitted 2007-06-07 · ✦ hep-ph

Integrating out strange quarks in ChPT

classification ✦ hep-ph
keywords quarkstrangetheorycasechiralexternalmassperturbation
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We study three flavour chiral perturbation theory in a limit where the strange quark mass is much larger than the external momenta and the up and down quark masses, and where the external fields are those of two-flavour chiral perturbation theory. In this case, the theory reduces to the one of SU(2)_L x SU(2)_R. Through this reduction, one can work out the strange quark mass dependence of the LECs in the two-flavour case. We present the pertinent relations at two-loop order for F,B and l_i.

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