Possible evidence for the breakdown of the CKM-paradigm of CP-violation

TL;DR

This paper presents evidence that the Standard Model's CKM paradigm of CP-violation may be incomplete, with experimental data indicating potential new physics at energy scales below 2 TeV, accessible at colliders.

Contribution

The study critically analyzes experimental deviations from the Standard Model, suggesting the presence of new CP-violating physics at accessible energy scales based on flavor physics data.

Findings

Measured sin(2β) is smaller than Standard Model expectations by up to 3.3 sigma.

BR(B→τν) appears less than predicted by about 2.8 sigma.

Deviations likely originate from B_d(s) mixings and sin(2β), not from epsilon_K.

Abstract

Using primarily experimental inputs for S(B -> psi Ks), Delta M_Bs, Delta M_Bd, BR(B -> tau nu) and epsilon_K along with necessary inputs from the lattice, we find that the measured value of sin(2 beta) is smaller than expectations of the Standard Model by as much as 3.3 sigma, and also that the measured value of the BR(B -> tau nu) seems to be less than the predicted value by about 2.8 sigma. However, through a critical study we show that most likely the dominant source of these deviations is in B_d(s) mixings and in sin(2 beta) and less so in B -> tau nu, and also that the bulk of the problem persists even if input from epsilon_K is not used. The fact that kaon mixing and epsilon_K are not the dominant source of the deviation from the Standard Model has the very important consequence that model independent considerations imply that the scale of the relevant new CP-violating physics is below O(2 TeV), thus suggesting that direct signals of the new particle(s) may well be accessible in collider experiments at the LHC and perhaps even at the Tevatron.