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First observation of a narrow charm-strange meson DsJ(2632) -> Ds eta and D0 K+ | | The SELEX Collaboration
; A.V.Evdokimov
; et al
; | | Date: |
17 Jun 2004 | | Journal: | Phys.Rev.Lett. 93 (2004) 242001 | | Subject: | hep-ex | | Abstract: | We report the first observation of a charm-strange meson DsJ(2632) at a mass of 2632.6+/-1.6 MeV/c^2 in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, Ds eta and D0 K+. In the Ds eta decay mode we observe an excess of 49.3 events with a significance of 7.2sigma at a mass of 2635.9+/-2.9 MeV/c^2. There is a corresponding peak of 14 events with a significance of 5.3sigma at 2631.5+/-1.9 MeV/c^2 in the decay mode D0 K+. The decay width of this state is <17 MeV/c^2 at 90% confidence level. The relative branching ratio Gamma(D0K+)/Gamma(Dseta) is 0.16+/-0.06. The mechanism which keeps this state narrow is unclear. Its decay pattern is also unusual, being dominated by the Ds eta decay mode. | | Source: | arXiv, hep-ex/0406045 | | Services: | Forum | Review | PDF | Favorites | |
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