1212.3118 (Yu. A. Simonov)

Magnetic test of chiral dynamics in QCD    [PDF]

Yu. A. Simonov

Magnetic fields in the range $ 0\leq eB\la 1$ GeV$^2$ effectively probe internal quark structure of chiral mesons and test basic parameters of chiral theory, such as $\lan\bar q q\ran, f_\pi$. We extend previously formulated chiral theory, including quark degrees of freedom, to the case of strong magnetic fields and show that the quark condensate $|\lan \bar q q\ran|_{u,d}$ grows quadratically with $eB$ for $eB\la 0.2$ GeV$^2$ and linearly for higher field values. These results agree quantitatively with recent lattice data and differ from $\chi PT$ predictions.

View original: http://arxiv.org/abs/1212.3118