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Strong P invariance, neutron EDM and minimal Left-Right parity at LHC

Authors :
Maiezza, Alessio
Nemevšek, Miha
Source :
Phys. Rev. D 90, 095002 (2014)
Publication Year :
2014

Abstract

In the minimal Left-Right model the choice of left-right symmetry is twofold: either generalized parity $\mathcal P$ or charge conjugation $\mathcal C$. In the minimal model with spontaneously broken strict $\mathcal P$, 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 $W_R$ mass at $20 \text{TeV}$ is set. Possible ways out of this bound, either by an additional relaxation mechanism or explicit breaking of $\mathcal P$ are considered. To this end, the chiral loop of the neutron electric dipole moment at next-to-leading order is re-computed and provides an estimate of the weak contribution. Combining this constraint with other CP violating observables in the kaon sector allows for $M_{W_R} \gtrsim 3 \text{TeV}$. On the other hand, $\mathcal C$-symmetry is free from such constraints, leaving the right-handed scale within the experimental reach.<br />Comment: 9 pages, 3 figures, two-columns. Added references and an additional discussion on UV counter-terms, matches the version accepted by PRD

Details

Database :
arXiv
Journal :
Phys. Rev. D 90, 095002 (2014)
Publication Type :
Report
Accession number :
edsarx.1407.3678
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevD.90.095002