Search for the exotic $\Theta^+$ resonance in the NOMAD experiment
Nomad Collaboration
TL;DR
This paper reports a search for the exotic Theta baryon in NOMAD neutrino data, finding no evidence and setting an upper limit on its production rate, with implications for understanding baryon resonance production.
Contribution
The study developed a specialized background generation method and optimized proton identification to enhance sensitivity to Theta baryon signals in neutrino interactions.
Findings
No evidence for Theta baryon observed in NOMAD data.
Upper limit on Theta production rate set at 2.13 per 1000 neutrino interactions.
Methodology improves sensitivity for exotic baryon searches.
Abstract
A search for exotic Theta baryon via Theta -> proton +Ks decay mode in the NOMAD muon neutrino DIS data is reported. The special background generation procedure was developed. The proton identification criteria are tuned to maximize the sensitivity to the Theta signal as a function of xF which allows to study the Theta production mechanism. We do not observe any evidence for the Theta state in the NOMAD data. We provide an upper limit on Theta production rate at 90% CL as 2.13 per 1000 of neutrino interactions.
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