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2019

The CKM unitarity problem: A trace of new physics at the TeV scale?

Belfatto, Benedetta, Beradze, Revaz, Berezhiani, Zurab

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After the recent high precision determinations of $V_{us}$ and $V_{ud}$, the first row of the CKM matrix shows more than $4\sigma$ deviation from unitarity.

Two possible scenarios beyond the Standard Model can be investigated in order to fill the gap.
If a 4th quark $b'$ participates in the mixing, with $\vert V_{ub'} \vert \sim0.04$, then its mass should be no more than 6 TeV or so.
A different solution can come from the introduction of the gauge horizontal family symmetry acting between the lepton families and spontaneously broken at the scale of about 6 TeV.

The CKM unitarity problem: A trace of new physics at the TeV scale? · Around

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