Non-standard charged current interactions: beta decays versus the LHC

By V. Cirigliano, M. González-Alonso, M. Graesser. 2012

154 citations recorded by the source corpus.

A bstractWe discuss low-energy and collider constraints on the effective couplings characterizing non-standard charged current interactions. A direct comparison of low-energy and LHC probes can be performed within an effective theory framework, when the new physics mediating these interactions originates in the multi-TeV scale. We find that for the effective couplings involving right-handed neutrinos the LHC bounds from pp → e + MET + X are at the (sub)percent level, already stronger than those from β decays. For operators involving left-handed neutrinos, the (axial-)vector and pseudo-scalar effective couplings are best probed at low energy, while scalar and tensor couplings are currently probed at the same level by beta decays and the LHC channels pp → e + MET + X and, by using SU(2) gauge invariance, pp → e+e− + X. Future beta decay experiments at the 0.1% level or better will compete in sensitivity with higher statistics and higher energy data from the LHC.

Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/fc14387145668867b4cafeb37e8e2ea2d4645117

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Citations in the corpus

Low-energy effective field theory below the electroweak scale: operators and matching (2017, background): “Hence, parts of the RGE relevant for particular processes have been well studied in the literature and are known to higher order [15, 16, 23– 32].”
Compilation of low-energy constraints on 4-fermion operators in the SMEFT (2017, background): “As a consequence, the superior energy reach of the LHC compensates the inferior precision in this case [22, 104].”
Beta Decays and Non-Standard Interactions in the LHC Era (2013, methodology): “The resulting constraints on the weak-scale couplings α̂j [45, 47, 37] are comparable to that obtained from Z-pole experiments, and are stronger than the ones obtained from σ(e+e− → qq̄) at LEP.”
Baryon number and lepton universality violation in leptoquark and diquark models (2017, background): “The effect of leptoquarks on B semileptonic decays to τ is described by the following terms of the effective Lagrangian for charged current interactions [78, 79]:”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “For instance, a contribution from an off-shell mediator grows with the partonic center of mass energy, and thus one does not require very high precision in order for the measurements to probe interesting NP scales [367, 368].”
Lepton universality violation with lepton flavor conservation in B-meson decays (2015, background): “To leading order in GF , the most general elementary charged-current Lagrangian mediating semileptonic decays reads [55, 56]:”
General neutrino interactions from an effective field theory perspective (2019, background): “Clearly, the charged-current operators in (3) would have an effect on beta decay [46–48].”