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journal id: "physicsxlettersxb"
| Authors | S.V. Chekanov (et al.), S.J.L.A. Grijpink, E.N. Koffeman, P.M. Kooijman, E. Maddox, A. Pellegrino, S.E.S. Schagen, H.G.J.M. Tiecke, L.W. Wiggers, E. de Wolf | | Title | Evidence for a narrow baryonic state decaying to K0(S) p and K0(S) anti-p in deep inelastic scattering at HERA |
| Journal | Physics Letters B |
| Volume | 591 |
| Year | 2004 |
| Issue | 1-2 |
| Pages | 7-22 |
| ISSN | 03702693 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Institute for High Energy Physics (IHEF) |
| Keywords | - |
| Abstract | A resonance search has been made in the K0 Sp and K0 Sp¯ 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 K0 Sp, interpreted as a pentaquark. The results presented here support the existence of such state,with amass of 1521.5±1.5(stat.)+2.8 −1.7(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2MeV. The signal is visible at highQ2 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. |
| Document type | Article |
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