Neutrino production of Dimuons at the Fermilab tevatron

Abstract

Neutrino and antineutrino interactions with two muons in the final state have been studied by the CCFR collaboration in the Fermilab Tevatron neutrino beam. The rate of neutrino- and antineutrino-induced prompt same-sign dimuon production in steel was measured using a sample of 220 μ −μ − events and 15 μ +μ + events with P μ > 9 GeV/c, and energies between 30 GeV and 600 GeV. After background subtraction, the prompt rate of same-sign dimuon production is (0.53 ± 0.24) × 10 −4 per ν μ charged-current event and (0.52 ± 0.33) × 10 −4 per ν μ charged-current event. After demanding P μ 1 ≥ 9 GeV/c, P μ 2 ≥ 5 GeV/c and 30 ≤ E ν ≤ 600 GeV a sample of 5044 ν μ 1062 ν μ induced μ ∓ μ ± events are observed. The data support the slow rescaling model of charm production with a value of m c = 1.31 ± .24 GeV/ c 2. The CKM matrix element V cd =.209±0.012 and the nucleon strangeness content, η ε =.064 −0.00065 +0.00075 are measured with the strange sea x distribution found to be softer than its non-strange counterpart. The first measurements of the Q 2 dependence of the strange quark densities, ϰ s(ϰ), are also presented.