Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-06-11
Phys.Lett. B549 (2002) 26-31
Physics
Nuclear Physics
Nuclear Theory
8 pages, LaTeX, uses RevTeX 4, one additional reference added. Some points clarified in response to referee report. To be publ
Scientific paper
10.1016/S0370-2693(02)02868-X
We discuss how to reduce theoretical uncertainties in the neutrino-deuteron breakup cross-sections crucial to the Sudbury Neutrino Observatory's efforts to measure the solar neutrino flux. In effective field theory, the dominant uncertainties in all neutrino-deuteron reactions can be expressed through a single, common, isovector axial two-body current parameterized by $L_{1,A}$. After briefly reviewing the status of fixing $L_{1,A}$ experimentally, we present a constraint on $L_{1,A}$ imposed by existing reactor antineutrino-deuteron breakup data. This constraint alone leads to an uncertainty of 6-7% at 7 MeV neutrino energy in the cross-sections relevant to the Sudbury Neutrino Observatory. However, more significantly for the Sudbury experiment, the constraint implies an uncertainty of only 0.7% in the ratio of charged to neutral current cross-sections used to verify the existence of neutrino oscillations, at the same energy. This is the only direct experimental constraint from the two-body system, to date, of the uncertainty in these cross-sections.
Butler Malcolm
Chen Jiunn-Wei
Vogel Petr
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