Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-12-16
Nucl.Phys. A651 (1999) 277-286
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages
Scientific paper
10.1016/S0375-9474(99)00142-6
We consider ratios of elastic neutrino(antineutrino)-proton cross sections measured by the Brookhaven BNL-734 experiment and use them to obtain the neutral current (NC) over charged current (CC) neutrino-antineutrino asymmetry. We discuss the sensitivity of these ratios and of the asymmetry to the electric, magnetic and axial strange form factors of the nucleon and to the axial cutoff mass M_A. We show that the effects of the nuclear structure and interactions on the asymmetry and, in general, on ratios of cross sections are negligible. We find some restrictions on the possible values of the parameters characterizing the strange form factors. We show that a precise measurement of the neutrino-antineutrino asymmetry would allow the extraction of the axial and vector magnetic strange form factors in a model independent way. The neutrino-antineutrino asymmetry turns out to be almost independent on the electric strange form factor and on the axial cutoff mass.
Alberico Wanda M.
Barbaro Maria B.
Bilenky Samoil M.
Caballero Jose Antonio
de Guerra Moya E.
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