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arXiv · 0708.2820

Associated Charm Production in Neutrino-Nucleus Interactions

The CHORUS Collaboration
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Abstract

In this paper a search for associated charm production both in neutral and charged current $ν$-nucleus interactions is presented. The improvement of automatic scanning systems in the {CHORUS} experiment allows an efficient search to be performed in emulsion for short-lived particles. Hence a search for rare processes, like the associated charm production, becomes possible through the observation of the double charm-decay topology with a very low background. About 130,000 $ν$ interactions located in the emulsion target have been analysed. Three events with two charm decays have been observed in the neutral-current sample with an estimated background of 0.18$\pm$0.05. The relative rate of the associated charm cross-section in deep inelastic $ν$ interactions, $σ(c\bar{c}ν)/σ_\mathrm{NC}^\mathrm{DIS}= (3.62^{+2.95}_{-2.42}({stat})\pm 0.54({syst}))\times 10^{-3}$ has been measured. One event with two charm decays has been observed in charged-current $ν_μ$ interactions with an estimated background of 0.18$\pm$0.06 and the upper limit on associated charm production in charged-current interactions at 90% C.L. has been found to be $σ(c\bar{c} μ^-)/σ_\mathrm{CC} < 9.69 \times 10^{-4}$.

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The CHORUS Collaboration. 2007-08-21. Associated Charm Production in Neutrino-Nucleus Interactions. https://doi.org/10.1140/epjc%2Fs10052-007-0410-8

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