Strong P invariance, neutron electric dipole moment, and minimal left-right parity at LHC

In the minimal left-right model the choice of left-right symmetry is twofold: either generalized parity P or charge conjugation C. In the minimal model with spontaneously broken strict P, a large tree-level contribution to strong CP violation can be computed in terms of the spontaneous phase alpha ....

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2014-11, Vol.90 (9), Article 095002
Main Authors: Maiezza, Alessio, Nemevšek, Miha
Format: Article
Language:English
Subjects:
Conjugation
Cosmology
Dipole moment
Electric dipoles
Gravitation
Kaons
Parity
Symmetry
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Summary:In the minimal left-right model the choice of left-right symmetry is twofold: either generalized parity P or charge conjugation C. In the minimal model with spontaneously broken strict P, a large tree-level contribution to strong CP violation can be computed in terms of the spontaneous phase alpha . Searches for the neutron electric dipole moments then constrain the size of alpha . Following the latest update on indirect CP violation in the kaon sector, a bound on WR mass at 20 TeV is set. Possible ways out of this bound require a further hypothesis, either a relaxation mechanism or explicit breaking of P. To this end, the chiral loop of the neutron electric dipole moment at next-to-leading order is recomputed and provides an estimate of the weak contribution. Combining this constraint with other CP-violating observables in the kaon sector allows for MWR [> ~] 3 TeV. On the other hand, C symmetry is free from such constraints, leaving the right-handed scale within the experimental reach.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.90.095002