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Integrating out strange quarks in ChPT · Around

2007

Integrating out strange quarks in ChPT

Gasser, Jurg, Haefeli, Christoph, Ivanov, Mikhail A. et al.

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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.

Built on

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2004

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M. Frink and U. G. Meissner, JHEP 0407

2004

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S. Descotes-Genon, hep-ph/0703154

Cited in the paper.

J. Gasser, Ch. Haefeli, M. A. Ivanov and M. Schmid, in preparation

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J. Bijnens, private communication

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J. Bijnens, http://www.thep.lu.se/

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