Present and Future K and B Meson Mixing Constraints on TeV Scale Left-Right Symmetry

By S. Bertolini, Alessio Maiezza, Fabrizio Nesti. 2014

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We revisit the Δ F = 2 transitions in the K and B d , s neutral meson systems in the context of the minimal left-right symmetric model. We take into account, in addition to up-to-date phenomenological data, the contributions related to the renormalization of the flavor-changing neutral Higgs tree-level amplitude. These contributions were neglected in recent discussions, albeit formally needed in order to obtain a gauge-independent result. Their impact on the minimal LR model is crucial and twofold. First, the effects are relevant in B meson oscillations, for both CP conserving and CP violating observables, so that for the first time these imply constraints on the LR scenario which compete with those of the K sector (plagued by long-distance uncertainties). Second, they sizably contribute to the indirect kaon CP violation parameter ϵ . We discuss the bounds from B and K mesons in both cases of LR symmetry: generalized parity ( P ) and charge conjugation ( C ). In the case of P , the interplay between the CP-violation parameters ϵ and ϵ ′ leads us to rule out the regime of very hierarchical bidoublet vacuum expectation values v 2 / v 1 m b / m t ≃ 0.02 . In general, by minimizing the scalar field contribution up to the limit of the perturbative regime and by definite values of the relevant CP phases in the charged right-handed currents, we find that a right-handed gauge boson W R as light as 3 TeV is allowed at the 95% C. L. This is well within the reach of direct detection at the next LHC run. If not discovered, within a decade the upgraded LHCb and Super B factories may reach an indirect sensitivity to a left-right scale of 8 TeV.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/33092c942b718eaf9cd0382b1b00c653c40e555d

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In Nuclear and High Energy Physics

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  3. T. Han
  4. Tong Li
  5. Robert Brandenberger
  6. Emmanuel N. Saridakis

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