Solution of the Strong CP problem in the low energy effective Standard Model

Subhendra Mohanty

Solution of the Strong CP problem in the low energy effective Standard Model

High Energy Physics - Phenomenology 2007-05-23 v1

Authors: Subhendra Mohanty

Abstract

We consider the low energy effective chiral theory of QCD mesons and the electroweak Goldstone bosons. In this effective theory the pion sector contributes to the gauge boson masses and the Yukawa couplings of the fermions. Consequently the Yukawa sector of quarks and leptons can have a $SU(2)_L\times U(1)_Y\times U(1)_A$ global symmetry even with nonvanishing fermion masses. The extra chiral $U(1)_A$ symmetry can be used to rotate the CP violating $\bar \theta G\tilde G$ term away which therefore makes no contribution to low energy CP violating effects like the neutron electric dipole momment. The Goldstone mode associated with this $U(1)_A$ symmetry may be identified with the $SU(2)$ singlet meson $\eta_0$ .

Keywords

strong CP problem effective chiral theory electroweak Goldstone bosons U(1)_A symmetry neutron electric dipole moment eta meson

Cite

@article{arxiv.hep-ph/9406415,
  title  = {Solution of the Strong CP problem in the low energy effective Standard Model},
  author = {Subhendra Mohanty},
  journal= {arXiv preprint arXiv:hep-ph/9406415},
  year   = {2007}
}

Comments

IP/BBSR/93-79, ReVTeX, 11pages

Solution of the Strong CP problem in the low energy effective Standard Model

Abstract

Keywords

Cite

Comments

Related papers