The resonance parameters of the χc0, the 13 P0 state of charmonium, have been measured at the Fermilab Antiproton Accumulator in the reaction p¯p→χc0→γ J/ψ →γ (e+e−). A large data sample collected during the year 2000 run yields the results: M(χc0) = 3415.4±0.4±0.2MeV/c2, Γ (χc0) = 9.8±1.0±0.1MeV, B(χc0→ ¯pp)×B(χc0→γJ/ψ)×B(J/ψ → (e+−)) = (1.61 ± 0.11 ± 0.08) × 10−7. Taking B(χc0 → γJ/ψ) and B(J/ψ → e+e−) from the literature, we obtain B(χc0 → ¯pp) = (4.1 ± 0.3+1.6−0.9) × 10−4 and Γ (χc0 → ¯pp) = (4.0 ± 0.4+1.6−0.9) keV
New measurements of the resonance parameters of the χc0(13P0) state of charmonium
LO VETERE, MAURIZIO;MARINELLI, MAURO;PALLAVICINI, MARCO;PATRIGNANI, CLAUDIA;SANTRONI, ALBERTO;
2002-01-01
Abstract
The resonance parameters of the χc0, the 13 P0 state of charmonium, have been measured at the Fermilab Antiproton Accumulator in the reaction p¯p→χc0→γ J/ψ →γ (e+e−). A large data sample collected during the year 2000 run yields the results: M(χc0) = 3415.4±0.4±0.2MeV/c2, Γ (χc0) = 9.8±1.0±0.1MeV, B(χc0→ ¯pp)×B(χc0→γJ/ψ)×B(J/ψ → (e+−)) = (1.61 ± 0.11 ± 0.08) × 10−7. Taking B(χc0 → γJ/ψ) and B(J/ψ → e+e−) from the literature, we obtain B(χc0 → ¯pp) = (4.1 ± 0.3+1.6−0.9) × 10−4 and Γ (χc0 → ¯pp) = (4.0 ± 0.4+1.6−0.9) keV
File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
