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Evidence for a narrow baryonic state decaying to K0Sp and K0Sp̄ in deep inelastic scattering at HERA
- Source :
- Physics Letters B, 591, 7-22. Elsevier, Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. B591, p. 7-22 (2004)
- Publication Year :
- 2004
- Publisher :
- Elsevier BV, 2004.
-
Abstract
- 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}.<br />4 eps figures, 15 pages, 1 table, accepted by Physics Letters B
- Subjects :
- Physics
Particle physics
Nuclear and High Energy Physics
Luminosity (scattering theory)
010308 nuclear & particles physics
Hadron
FOS: Physical sciences
HERA
Inelastic scattering
Deep inelastic scattering
01 natural sciences
Resonance (particle physics)
Pentaquark
3. Good health
High Energy Physics - Experiment
Nuclear physics
Baryon
High Energy Physics - Experiment (hep-ex)
0103 physical sciences
High Energy Physics::Experiment
010306 general physics
Nuclear Experiment
Subjects
Details
- ISSN :
- 03702693
- Volume :
- 591
- Issue :
- 1-2
- Database :
- OpenAIRE
- Journal :
- Physics Letters B
- Accession number :
- edsair.doi.dedup.....7b0c03d89f39670c449ca26ef8a90ffe
- Full Text :
- https://doi.org/10.1016/j.physletb.2004.04.024