Right-handed neutrinos and the CDF II anomaly

Blennow, Mattias; Coloma, Pilar; Fernández-Martínez, Enrique; González-López, Manuel

doi:10.1103/PhysRevD.106.073005

Right-handed neutrinos and the CDF II anomaly

Apr 9, 2022

5 pages

Published in:

Phys.Rev.D 106 (2022) 7, 073005

Published: Oct 1, 2022

e-Print:

2204.04559 [hep-ph]

DOI:

10.1103/PhysRevD.106.073005 (publication)

Report number:

IFT-UAM/CSIC-22-42

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Abstract: (APS)

We point out that right-handed neutrinos can resolve the tension between the latest CDF II measurement of

M_{W}

and the SM. Integrating out the new states yields a single

d = 6

operator, which translates into a nonunitary leptonic mixing matrix. This alters the extraction of

G_{F}

from muon decay and increases the prediction for

M_{W}

, in line with the CDF II result. We find that this explanation worsens the so-called Cabibbo anomaly, which could still be explained through the same

d = 6

operator if it is not generated by right-handed neutrinos. Exploiting the flavor dependence, a common explanation of both anomalies would a priori be possible, but is ruled out by weak universality constraints.

Note:

5 pages, 1 figure, REVTeX4

CDF
W: mass
neutrino: right-handed
operator: dimension: 6
PMNS matrix
unitarity
tau: decay
muon: decay
Cabibbo angle
anomaly

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