Deuterium target data for precision neutrino-nucleus cross sections

被引:115
作者
Meyer, Aaron S. [1 ,2 ,3 ]
Betancourt, Minerba [3 ]
Gran, Richard [4 ]
Hill, Richard J. [2 ,5 ,6 ]
机构
[1] Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA
[2] Univ Chicago, Dept Phys, Chicago, IL 60637 USA
[3] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA
[4] Univ Minnesota, Dept Phys & Astron, Duluth, MN 55812 USA
[5] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
[6] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada
基金
美国国家科学基金会;
关键词
FORM-FACTORS; VECTOR; SCATTERING; HYDROGEN;
D O I
10.1103/PhysRevD.93.113015
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Amplitudes derived from scattering data on elementary targets are basic inputs to neutrino-nucleus cross section predictions. A prominent example is the isovector axial nucleon form factor, F-A(q(2)), which controls charged current signal processes at accelerator-based neutrino oscillation experiments. Previous extractions of F-A from neutrino-deuteron scattering data rely on a dipole shape assumption that introduces an unquantified error. A new analysis of world data for neutrino-deuteron scattering is performed using a model-independent, and systematically improvable, representation of FA. A complete error budget for the nucleon isovector axial radius leads to r(A)(2) = 0.46(22) m(2), with a much larger uncertainty than determined in the original analyses. The quasielastic neutrino-neutron cross section is determined as sigma(v(mu)n -> mu(-)p)vertical bar E-nu=1 GeV = 10.1(0.9) x 10(-39) cm(2). The propagation of nucleon-level constraints and uncertainties to nuclear cross sections is illustrated using MINERvA data and the GENIE event generator. These techniques can be readily extended to other amplitudes and processes.
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页数:18
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