Strong CP violation in an effective chiral Lagrangian approach

Pich, Antonio; de Rafael, Eduardo

doi:10.1016/0550-3213(91)90019-T

Strong CP violation in an effective chiral Lagrangian approach

Antonio Pich
(
- CERN
)
,
Eduardo de Rafael
(
- CERN
)

Apr, 1991

21 pages

Published in:

Nucl.Phys.B 367 (1991) 313-333

Published: 1991

DOI:

10.1016/0550-3213(91)90019-T

Report number:

CERN-TH-6071-91

View in:

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Abstract: (Elsevier)

Possible long-distance effects like η → ππ and the electric dipole moment of the neutron (nEDM), which may originate in the strong CP -non-conserving sector of QCD, are re-examined in the light of an effective chiral lagrangian approach. Contrary to recent claims, we show that it is possible to obtain reliable estimates for these processes from chiral symmetry and low-energy phenomenology (modulo the size of the θ-vacuum angle, of course). We also discuss how an improvement of the presented estimate of the nEDM could be made, if necessary.

strong interaction: CP
CP: strong interaction
CP: violation
effect: long-range
quantum chromodynamics
effective Lagrangian: chiral
vacuum state: topological
n: electric moment
boson: Goldstone particle
anomaly: U(1)

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