Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.202502
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Funding
- U.S. Department of Energy
- Argonne National Laboratory [DE-AC02-06CH11357]
- Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- National Science Foundation [PHY-173857, PHY-2011890, PHY-1913728]
- NSERC, Canada [SAPPJ-2018-00028]
- NERSC (a U.S. DOE Office of Science User Facility) [DE-AC02-05CH11231, NSF OAC-1818253]
- National Science Foundation Graduate Research Fellowship [1144082, DGE-1746045]
- DFG (German Research Foundation) [279384907-SFB 1245]
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We present the most precise measurement of tensor currents in the low-energy regime by examining the beta-(nu) over bar correlation of trapped Li-8 ions with the Beta-decay Paul Trap. The measured result is consistent with the standard model prediction.
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 beta-(nu) over bar correlation of trapped Li-8 ions with the Beta-decay Paul Trap. We find a(beta nu) = -0.3325 +/- 0.0013(stat) +/- 0.0019(syst) at 1 sigma for the case of coupling to right-handed neutrinos (C-T = -C-T'), which is consistent with the standard model prediction.
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