Evidence for a narrow baryonic state decaying to K0(S) p and K0(S) anti-p in deep inelastic scattering at HERA
(2004) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B591, p. 7-22 (2004)
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- (en) A resonance search has been made in the K0s p and K0s pbar invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb-1. The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300-318 GeV for exchanged photon virtuality, Q2, above 1 GeV2. Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K+ n and K0s p, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5+/-1.5(stat.)^{+2.8}_{-1.7}(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV. The signal is visible at high Q2 and, for Q2>20 GeV2, contains 221+/-48 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 6x10^{-5}. Comment: 4 eps figures, 15 pages, 1 table, accepted by Physics Letters B
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Chekanov, S., Piotrzkowski, K., & et al. (2004). Evidence for a narrow baryonic state decaying to K0(S) p and K0(S) anti-p in deep inelastic scattering at HERA. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B591, 7-22. https://doi.org/10.1016/j.physletb.2004.04.024 (Original work published 2004)