Zeus Collaboration, The;
(2004)
Evidence for a narrow baryonic state decaying to K0Sp and KOSp in deep inelastic scattering at HERA.
Physics Letters B
, 591
(1-2)
pp. 7-22.
10.1016/j.physletb.2004.04.024.
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Abstract
A resonance search has been made in the K0Sp and KOSp 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.
| Type: | Article |
|---|---|
| Title: | Evidence for a narrow baryonic state decaying to K0Sp and KOSp in deep inelastic scattering at HERA |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.physletb.2004.04.024 |
| Publisher version: | http://dx.doi.org/10.1016/j.physletb.2004.04.024 |
| Language: | English |
| Additional information: | The Zeus Collaboration includes the following UCL authors: C. Gwenlan, M. Wing, and J.M. Butterworth, R. Hall-Wilton, T.W. Jones, J.H. Loizides, M.R. Sutton, and C. Targett-Adams |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/9350 |
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