Abstract
We 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.
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ArXiv ePrint: 1210.4553
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Cirigliano, V., González-Alonso, M. & Graesser, M.L. Non-standard charged current interactions: beta decays versus the LHC. J. High Energ. Phys. 2013, 46 (2013). https://doi.org/10.1007/JHEP02(2013)046
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DOI: https://doi.org/10.1007/JHEP02(2013)046