Measurements of the mass and width of the eta(c) meson and of an eta(c)(2S) candidate.
| Author | |
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| Abstract |
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The mass m(eta(c)) and total width Gamma(eta(c))(tot) of the eta(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 eta(c)-->K(0)(S)K+/-pi(-/+) decays in 88 fb(-1) of data, the results are m(eta(c))=2982.5+/-1.1(stat)+/-0.9(syst) MeV/c(2) and Gamma(eta(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 eta(c)(2S) state. |
| Year of Publication |
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2004
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| Journal |
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Physical review letters
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| Volume |
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92
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| Issue |
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14
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| Number of Pages |
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142002
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| Date Published |
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2004
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| ISSN Number |
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0031-9007
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| URL |
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http://link.aps.org/abstract/PRL/v92/p142002
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| Short Title |
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Phys Rev Lett
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| Download citation |
