Journal article
Evidence for a narrow baryonic state decaying to K0Sp and [formula omitted] in deep inelastic scattering at HERA
Physics letters. B, Vol.591(1-2), pp.7-22
07/01/2004
DOI: 10.1016/j.physletb.2004.04.024
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.
Details
- Title: Subtitle
- Evidence for a narrow baryonic state decaying to K0Sp and [formula omitted] in deep inelastic scattering at HERA
- Creators
- ZEUS CollaborationJ. Repond (Contributor)
- Resource Type
- Journal article
- Publication Details
- Physics letters. B, Vol.591(1-2), pp.7-22
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.physletb.2004.04.024
- ISSN
- 0370-2693
- eISSN
- 1873-2445
- Language
- English
- Date published
- 07/01/2004
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627318402771
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