Authors

Document Type

Article

Publication Date

7-1-2004

Abstract

A resonance search has been made in the K0Sp and K0Sp̄ 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 K0Sp, 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 6×10-5. © 2004 Elsevier B.V. All rights reserved.

Journal Title

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Volume

591

Issue

1-2

First Page

7

Last Page

22

DOI

https://doi.org/10.1016/j.physletb.2004.04.024

First Department

Physics

Acknowledgements

Open access article retrieved April 9, 2021 from https://www.sciencedirect.com/science/article/pii/S037026930400615X

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