Abstract.
We discuss the uncertainties in constraining low-energy constants of chiral effective field theory from 3H \( \beta\) decay. The half-life is very precisely known, so that the Gamow-Teller matrix element has been used to fit the coupling \( c_D\) of the axial-vector current to a short-range two-nucleon pair. Because the same coupling also describes the leading one-pion-exchange three-nucleon force, this in principle provides a very constraining fit, uncorrelated with the 3H binding energy fit used to constrain another low-energy coupling in three-nucleon forces. However, so far such 3H half-life fits have only been performed at a fixed cutoff value. We show that the cutoff dependence due to the regulators in the axial-vector two-body current can significantly affect the Gamow-Teller matrix elements and consequently also the extracted values for the \( c_D\) coupling constant. The degree of the cutoff dependence is correlated with the softness of the employed NN interaction. As a result, present three-nucleon forces based on a fit to 3H \( \beta\) decay underestimate the uncertainty in \( c_D\) . We explore a range of \( c_D\) values that is compatible within cutoff variation with the experimental 3H half-life and estimate the resulting uncertainties for many-body systems by performing calculations of symmetric nuclear matter.
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Change history
15 May 2018
This erratum fixes an error in the use of the low-energy constant in the two-body currents. The corrected version of one of the equations and of some of the figures is reported.
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Klos, P., Carbone, A., Hebeler, K. et al. Uncertainties in constraining low-energy constants from 3H \( \beta\) decay. Eur. Phys. J. A 53, 168 (2017). https://doi.org/10.1140/epja/i2017-12357-7
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DOI: https://doi.org/10.1140/epja/i2017-12357-7