Probing Novel Scalar and Tensor Interactions from (Ultra)Cold Neutrons to the LHC

By Tanmoy Bhattacharya, V. Cirigliano, Saul D. Cohen, A. Filipuzzi, M. González-Alonso, M. Graesser, Rajan Gupta, Huey-Wen Lin. 2011

205 citations recorded by the source corpus.

Scalar and tensor interactions were once competitors to the now well-established V-A structure of the Standard Model weak interactions. We revisit these interactions and survey constraints from low-energy probes (neutron, nuclear, and pion decays) as well as collider searches. Currently, the most stringent limit on scalar and tensor interactions arise from 0+ -> 0+ nuclear decays and the radiative pion decay pi -> e nu gamma, respectively. For the future, we find that upcoming neutron beta decay and LHC measurements will compete in setting the most stringent bounds. For neutron beta decay, we demonstrate the importance of lattice computations of the neutron-to-proton matrix elements to setting limits on these interactions, and provide the first lattice estimate of the scalar charge and a new average of existing results for the tensor charge. Data taken at the LHC is currently probing these interactions at the 10^-2 level (relative to the standard weak interactions), with the potential to reach the 10^-3 level. We show that, with some theoretical assumptions, the discovery of a charged spin-0 resonance decaying to an electron and missing energy implies a lower limit on the strength of scalar interactions probed at low energy.

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

View Paper: https://www.semanticscholar.org/paper/90a19c2719bd9188cd31643ec2e32da9be7db8ce

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In Atomic and Molecular Physics, and Optics

In Nuclear and High Energy Physics

Citations in the corpus

Electric Dipole Moments of Nucleons, Nuclei, and Atoms: The Standard Model and Beyond (2013, methodology): “n Tables 15 through 20 appearing in Appendix B. We now review explicit computations of the hadronic matrix elements, leading to the results quoted in these tables. 8Note that the computations in Ref. [63] apply to the charged current form factors that are related to those of interest here by an isos”
Parton distributions and lattice-QCD calculations: Toward 3D structure (2020, background): “On the one hand, it can contribute to neutron β decay through a possible tensor coupling not included in the SM Lagrangian (Bhattacharya et al., 2012).”
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.”