Measurement of the quasi-elastic axial vector mass in neutrino-oxygen interactions
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Measurement of the quasi-elastic axial vector mass in neutrino-oxygen interactions

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Measurement of the quasi-elastic axial vector mass in neutrino-oxygen interactions

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K2K Collaboration; Gran, R.; Burguet Castell, Jordi; Català Pérez, Joan; Cervera Villanueva, Anselmo; Gómez Cadenas, Juan José Perfil; Novella Garijo, Pau; Sorel, Michel; Vidal Sitjes, Gabriel; Tornero López, Ana María
Aquest document és un/a article, creat/da en: 2006
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(mu)n ->mu(-)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-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-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.

    K2K Collaboration Gran, R. Burguet Castell, Jordi Català Pérez, Joan Cervera Villanueva, Anselmo Gómez Cadenas, Juan José Novella Garijo, Pau Sorel, Michel Vidal Sitjes, Gabriel Tornero López, Ana María 2006 Measurement of the quasi-elastic axial vector mass in neutrino-oxygen interactions Physical Review D 74 5 052002
http://dx.doi.org/10.1103/PhysRevD.74.052002
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