Seng, Chien-Yeah
[VerfasserIn];
de Vries, Jordy
[VerfasserIn];
Mereghetti, Emanuele
[VerfasserIn];
Patel, Hiren H.
[VerfasserIn];
Ramsey-Musolf, Michael
[VerfasserIn]
Nucleon electric dipole moments and the isovector parity- and time-reversal-odd pion–nucleon coupling
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Medientyp:
E-Artikel
Titel:
Nucleon electric dipole moments and the isovector parity- and time-reversal-odd pion–nucleon coupling
Beteiligte:
Seng, Chien-Yeah
[VerfasserIn];
de Vries, Jordy
[VerfasserIn];
Mereghetti, Emanuele
[VerfasserIn];
Patel, Hiren H.
[VerfasserIn];
Ramsey-Musolf, Michael
[VerfasserIn]
Anmerkungen:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Beschreibung:
The isovector time-reversal- and parity-violating pion–nucleon coupling View the MathML sourceg¯π(1) is uniquely sensitive to dimension-six interactions between right-handed light quarks and the Standard Model Higgs doublet that naturally arises in left-right symmetric models. Recent work has used the View the MathML sourceg¯π(1)-induced one-loop contribution to the neutron electric dipole moment dndn, together with the present experimental dndn bound, to constrain the CP-violating parameters of the left-right symmetric model. We show that this and related analyses are based on an earlier meson theory dndn computation that is not consistent with the power-counting appropriate for an effective field theory. We repeat the one-loop calculation using heavy baryon chiral perturbation theory and find that the resulting dndn sensitivity to View the MathML sourceg¯π(1) is suppressed, implying more relaxed constraints on the parameter space of the left-right symmetric model. Assuming no cancellations between this loop contribution and other contributions, such as the leading order EDM low-energy constant, the present limit on dndn implies View the MathML source|g¯π(1)|≲1.1×10−10.