Measurement of the Mass and Width of the eta{sub c} Meson and of an eta{sub c}(2S) Candidate
The mass m{sub {eta}{sub c}} and total width {Lambda}{sub tot}{sup {eta}{sub c}} of the {eta}{sub c} meson have been measured in two-photon interactions at the SLAC e{sup +}e{sup -} asymmetric B-Factory with the BABAR detector. With a sample of approximately 2500 reconstructed {eta}{sub c} {yields} K{sub S}{sup 0}K{sup {+-}} {pi}{sup {-+}} decays in 88 fb{sup -1} of data, the results are m{sup {eta}{sub c}} = 2982.5 {+-} 1.1 (stat) {+-} 0.9 (syst) MeV/c{sup 2} and {Lambda}{sub tot}{sup {eta}{sub c}} = 34.3 {+-} 2.3 (stat) {+-} 0.9 (syst) MeV/c{sup 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{sup 2} and width of 17.0 {+-} 8.3 (stat) {+-} 2.5 (syst) MeV/c{sup 2}. This observation is consistent with expectations for the {eta}{sub c}(2S) state.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 826546
- Report Number(s):
- SLAC-PUB-10245; TRN: US0403407
- Resource Relation:
- Other Information: PBD: 19 Nov 2003
- Country of Publication:
- United States
- Language:
- English
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