Evidence for the positive-strangeness pentaquark $Θ^+$ in photoproduction with the SAPHIR detector at ELSA
| dc.creator | The SAPHIR Collaboration | |
| dc.creator | Barth, J. | |
| dc.date | 2003-07-30 | |
| dc.date | 2003-09-30 | |
| dc.date.accessioned | 2026-07-07T10:28:19Z | |
| dc.date.available | 2026-07-07T10:28:19Z | |
| dc.description | The positive--strangeness baryon resonance $Θ^+$ is observed in photoproduction of the $\rm nK^+K^0_s$ final state with the SAPHIR detector at the Bonn ELectron Stretcher Accelerator ELSA. It is seen as a peak in the $\rm nK^+$ invariant mass distribution with a $4.8σ$ confidence level. We find a mass $\rm M_{Θ^+} = 1540\pm 4\pm 2$ MeV and an upper limit of the width $\rm Γ_{Θ^+} < 25$ MeV at 90% c.l. From the absence of a signal in the $\rm pK^+$ invariant mass distribution in $\rmγp\to pK^+K^-$ at the expected strength we conclude that the $Θ^+$ must be isoscalar. | |
| dc.description | 9 pages, 4 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0307083 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0307083 | |
| dc.identifier | Phys.Lett.B572:127-132,2003 | |
| dc.identifier | doi:10.1016/j.physletb.2003.08.019 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177408 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Evidence for the positive-strangeness pentaquark $Θ^+$ in photoproduction with the SAPHIR detector at ELSA | |
| dc.type | text |