Abstract
The electroweak interaction in the standard model is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this Letter, we present the most precise measurement of tensor currents in the low-energy regime by examining the β-ν¯ correlation of trapped Li8 ions with the Beta-decay Paul Trap. We find aβν=-0.3325±0.0013stat±0.0019syst at 1σ for the case of coupling to right-handed neutrinos (CT=-CT′), which is consistent with the standard model prediction.
| Original language | English |
|---|---|
| Article number | 2023502 |
| Journal | Physical Review Letters |
| Volume | 128 |
| Issue number | 20 |
| DOIs | |
| State | Published - May 20 2022 |
Funding
We acknowledge the ATLAS staff for their help and support. This work was carried out under the auspices of the U.S. Department of Energy, by Argonne National Laboratory under Contract No. DE-AC02-06CH11357 and Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344, the National Science Foundation under Grants No. PHY-173857, No. PHY-2011890, and No. PHY-1913728, as well as the NSERC, Canada, Application SAPPJ-2018-00028. This research used resources of Argonne National Laboratory’s ATLAS facility, which is a DOE Office of Science User Facility. This work also benefited from high performance computational resources provided by LSU, NERSC (a U.S. DOE Office of Science User Facility operated under Contract No. DE-AC02-05CH11231), as well as the Frontera computing project at Texas Advanced Computing Center (NSF OAC-1818253). M. T. B. and L. V. were supported by the National Science Foundation Graduate Research Fellowship under Grants No. 1144082 and No. DGE-1746045, respectively. B. M. acknowledges support from the DFG (German Research Foundation), Project No. 279384907-SFB 1245.