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Measurement of the mass and full width of the eta(c) meson

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Abstract

In a sample of 7.8 million J/psi decays collected in the Beijing Spectrometer, the process J/psi --> gamma eta(c) is observed for live different eta(c) decay channels: K+ K- pi(+)pi(-), pi(+)pi(-)pi(+)pi(-), K+/- K(s)(o)pi(-/+) (with K-s(o) --> pi(+)pi(-)), phi phi (with phi-->K+K-) and K(+)K(-)pi(o). From these signals, we determine the mass of eta(c) to be 2976.6+/-2.9 +/- 1.3 MeV. Combining this result with a previously reported result from a similar study using psi(2S)-->gamma eta(c) detected in the same spectrometer gives m(eta c) = 2976.3 +/- 2.3 +/- 1.2 MeV. For the combined samples, we obtain Gamma(eta c) = 11.0 +/- 8.1 +/- 4.1 MeV.

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What this paper is about

In a sample of 7.8 million J/psi decays collected in the Beijing Spectrometer, the process J/psi --> gamma eta(c) is observed for live different eta(c) decay channels: K+ K- pi(+)pi(-), pi(+)pi(-)pi(+)pi(-), K+/- K(s)(o)pi(-/+) (with K-s(o) --> pi(+)pi(-)), phi phi (with phi-->K+K-) and K(+)K(-)pi(o). From these signals, we determine the mass of eta(c) to be 2976.6+/-2.9 +/- 1.3 MeV. Combining this result with a previously reported result from a similar study using psi(2S)-->gamma eta(c) detected in the same spectrometer gives m(eta c) = 2976.3 +/- 2.3 +/- 1.2 MeV. For the combined samples, we obtain Gamma(eta c) = 11.0 +/- 8.1 +/- 4.1 MeV.

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Available abstract

In a sample of 7.8 million J/psi decays collected in the Beijing Spectrometer, the process J/psi --> gamma eta(c) is observed for live different eta(c) decay channels: K+ K- pi(+)pi(-), pi(+)pi(-)pi(+)pi(-), K+/- K(s)(o)pi(-/+) (with K-s(o) --> pi(+)pi(-)), phi phi (with phi-->K+K-) and K(+)K(-)pi(o). From these signals, we determine the mass of eta(c) to be 2976.6+/-2.9 +/- 1.3 MeV. Combining this result with a previously reported result from a similar study using psi(2S)-->gamma eta(c) detected in the same spectrometer gives m(eta c) = 2976.3 +/- 2.3 +/- 1.2 MeV. For the combined samples, we obtain Gamma(eta c) = 11.0 +/- 8.1 +/- 4.1 MeV.

Key concepts: Physics, Pi, Meson, Particle physics, Analytical Chemistry (journal), Nuclear physics, Spectrometer, Pion

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