Observation of a threshold enhancement in the p \bar{Lambda} invariant mass spectrum
| dc.creator | BES Collaboration | |
| dc.creator | Ablikim, M. | |
| dc.date | 2004-05-18 | |
| dc.date.accessioned | 2026-07-07T10:28:25Z | |
| dc.date.available | 2026-07-07T10:28:25Z | |
| dc.description | An enhancement near the m_p + M_Λ mass threshold is observed in the combined p \barΛ and \bar{p}Λinvariant mass spectrum from J/ψ--> p K^- \bar{Lambda} + c.c. decays. It can be fit with an S-wave Breit-Wigner resonance with a mass m = 2075 +- 12 (stat) +- 5 (syst) MeV and a width of Γ= 90 +- 35 (stat) +- 9 (syst) MeV; it can also be fit with a P-wave Breit-Wigner resonance. Evidence for a similar enhancement is also observed in ψ' --> p K^- \barΛ + c.c. decays. The analysis is based on samples of 5.8 X 10^7 J/ψand 1.4 X 10^7 ψ' decays accumulated in the BES II detector at the Beijing Electron-Positron Collider. | |
| dc.description | 5 pages, 3 figures, RevTex4, Submitted to Phys. Rev. Lett | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0405050 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0405050 | |
| dc.identifier | Phys.Rev.Lett.93:112002,2004 | |
| dc.identifier | doi:10.1103/PhysRevLett.93.112002 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177441 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Observation of a threshold enhancement in the p \bar{Lambda} invariant mass spectrum | |
| dc.type | text |