The mass m η c and total width Γ η c tot of the η c meson have been measured in two-photon interactions at the SLAC e + e − asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed η c → K 0 S K ± π ∓ decays in 88     fb − 1 of data, the results are m η c = 2982.5 ± 1.1 ( stat ) ± 0.9 ( syst )     MeV / c 2 and Γ η c tot = 34.3 ± 2.3 ( stat ) ± 0.9 ( syst )     MeV / c 2 . Using the same decay mode, a second resonance with 112 ± 24 events is observed with a mass of 3630.8 ± 3.4 ( stat ) ± 1.0 ( syst )     MeV / c 2 and width of 17.0 ± 8.3 ( stat ) ± 2.5 ( syst )     MeV / c 2 . This observation is consistent with expectations for the η c ( 2 S ) state.

Measurements of the Mass and Width of the ηc Meson and of an ηc(2S) Candidate

FERRONI, Fernando
2004

Abstract

The mass m η c and total width Γ η c tot of the η c meson have been measured in two-photon interactions at the SLAC e + e − asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed η c → K 0 S K ± π ∓ decays in 88     fb − 1 of data, the results are m η c = 2982.5 ± 1.1 ( stat ) ± 0.9 ( syst )     MeV / c 2 and Γ η c tot = 34.3 ± 2.3 ( stat ) ± 0.9 ( syst )     MeV / c 2 . Using the same decay mode, a second resonance with 112 ± 24 events is observed with a mass of 3630.8 ± 3.4 ( stat ) ± 1.0 ( syst )     MeV / c 2 and width of 17.0 ± 8.3 ( stat ) ± 2.5 ( syst )     MeV / c 2 . This observation is consistent with expectations for the η c ( 2 S ) state.
File in questo prodotto:
File Dimensione Formato  
2004_PhysRevLett_92_Ferroni.pdf

non disponibili

Licenza: Non pubblico
180.38 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12571/3022
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 105
  • ???jsp.display-item.citation.isi??? 83
social impact