Abstract
A search for a narrow baryonic resonance decaying to $K^0_s p$ or $K^0_s \bar p$ is carried out in deep inelastic ep scattering with the H1 detector at HERA. Such a resonance could be a strange pentaquark \thplns, evidence for which has been reported by several experiments. The $K^0_s p$ and $K^0_s \bar p$ invariant mass distributions presented here do not show any significant peak in the mass range from threshold up to 1.7 GeV. Mass dependent upper limits on $\sigma(ep \to e \thplf X)\times BR(\thplf \to K^0 p)$ are obtained at the 95% confidence level.
Highlights
Several fixed-target experiments have published evidence for the production of a strange pentaquark1 Θ+ [1], a hypothetical baryon [2] with a minimal quark content of uudds, observed in the decay channels K+n and Ks0 p
Evidence for Θ+ production has been obtained in deep inelastic ep scattering (DIS) at HERA by the ZEUS experiment [3]
This paper presents a search for the strange pentaquark Θ+ using 74 pb−1 of deep inelastic ep scattering data taken with the H1 detector in the years 1996-2000
Summary
Several fixed-target experiments have published evidence for the production of a strange pentaquark Θ+ [1], a hypothetical baryon [2] with a minimal quark content of uudds, observed in the decay channels K+n and Ks0 p. This state has been reported with masses in the range of 1520 to 1540 MeV and with a narrow width, consistent with the experimental resolution in most of the observations. This paper presents a search for the strange pentaquark Θ+ using 74 pb−1 of deep inelastic ep scattering data taken with the H1 detector in the years 1996-2000. A narrow resonance is searched for in the Ks0 p or Ks0 pdecay channel in the mass range from 1.48 to 1.7 GeV and in the kinematic range of negative four momentum transfer squared, Q2, from 5 to 100 GeV2 and of inelasticity, y, from 0.1 to 0.6
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