Measurement of the quasielastic axial vector mass in neutrino interactions on oxygen
- Department of Physics, University of Washington, Seattle, Washington 98195-1560 (United States)
- Department of Physics, Seoul National University, Seoul 151-747, Korea (Korea, Republic of)
- Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, E-08193 Bellaterra (Barcelona) (Spain)
- Kobe University, Kobe, Hyogo 657-8501 (Japan)
The weak nucleon axial-vector form factor for quasielastic interactions is determined using neutrino interaction data from the K2K Scintillating Fiber detector in the neutrino beam at KEK. More than 12 000 events are analyzed, of which half are charged-current quasielastic interactions {nu}{sub {mu}}n{yields}{mu}{sup -}p occurring primarily in oxygen nuclei. We use a relativistic Fermi gas model for oxygen and assume the form factor is approximately a dipole with one parameter, the axial-vector mass M{sub A}, and fit to the shape of the distribution of the square of the momentum transfer from the nucleon to the nucleus. Our best fit result for M{sub A}=1.20{+-}0.12 GeV. Furthermore, this analysis includes updated vector form factors from recent electron scattering experiments and a discussion of the effects of the nucleon momentum on the shape of the fitted distributions.
- OSTI ID:
- 20871076
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 74, Issue 5; Other Information: DOI: 10.1103/PhysRevD.74.052002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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