E.C. Ma

activity

19982003

J / ψ \to γ K^{+} K^{-}

and

γ K_{S}^{0} K_{S}^{0}

62 citations · 302 across the 12 of their papers we have counts for

collaborators

12 papers

hep-ex2003★ 62 cited

Partial Wave Analyses of $J / ψ \to γ K^{+} K^{-}$ and $γ K_{S}^{0} K_{S}^{0}$

J. Z. Bai et al

Results are presented on $J / ψ$ radiative decays to $K^{+} K^{-}$ and $K_{S}^{0} K_{S}^{0}$ based on a sample of 58M $J / ψ$ events taken with the BES II detector. A partial wave analysis is carrie…

hep-ex2003★ 5 cited

Measurement of Inclusive Monmentum Spectra and Multiplicity Distributions of Charged Particles at $s \sim 2 - 5$ GeV

BES Collaboration, J. Z. Bai

Inclusive momentum spectra and multiplicity distributions of charged particles measured with BESII detector at center of mass energies of 2.2,2.6,3.0,3.2,4.6 and 4.8 GeV are presen…

hep-ex2003★ 14 cited

First Evidence of Lambda Lambda-bar in χ_cJ Decays

BES Collaboration, J. Z. Bai

The first observation of χ_cJ (J=0,1,2) decays to Lambda Lambda-bar is reported using ψ(2S) data collected with the BESII detector at the BEPC. The branching ratios are determined…

hep-ex2003★ 23 cited

Measurements of the Mass and Full-Width of the $η_{c}$ Meson

J. Z. Bai

In a sample of 58 million $J / ψ$ events collected with the BES II detector, the process J/ $ψ \to γ η_{c}$ is observed in five different decay channels: $γ K^{+} K^{-} π^{+} π^{-}$ , $γ π^{+} π^{-} π^{+} π^{-}$ ,…

hep-ex2001★ 16 cited

Radiative Decay of the ψ(2S) into Two Pseudoscalar Mesons

BES Collaboration

Radiative decays of the radially excited charmonium resonance, ψ(2S), into ππ, K Kbar and ηηfinal states have been measured in a sample of 3.96 * 10^6 ψ(2S) events collected by the…

hep-ex2000★ 14 cited

Measurement of $ψ (2 S)$ decays to baryon pairs

J. Z. Bai

A sample of 3.95M $ψ (2 S)$ decays registered in the BES detector are used to study final states containing pairs of octet and decuplet baryons. We report branching fractions for $ψ(…

hep-ex2000★ 31 cited

Partial Wave Analysis of $J / ψ \to γ (K^{\pm} K_{S}^{0} π^{\mp})$

J. Z. Bai

BES data on $J / ψ \to γ (K^{\pm} K_{S}^{0} π^{\mp})$ are presented. There is a strong peak due to $η (1440) / ι$ , which is fitted with a Breit-Wigner amplitude with $s$ -dependent widths for…

hep-ex1999★ 13 cited

Measurement of the Inclusive Charm Cross Section at 4.03 GeV and 4.14 GeV

BES Collaboration

The cross section for charmed meson production at $s = 4.03$ and 4.14 GeV has been measured with the Beijing Spectrometer. The measurement was made using 22.3 $p b^{- 1}$ of…

hep-ex1999★ 54 cited

Partial Wave Analysis of $J / ψ \to γ (π^{+} π^{-} π^{+} π^{-})$

J. Z. Bai

BES data on $J / ψ \to γ (π^{+} π^{-} π^{+} π^{-})$ have been analyzed into partial waves. We fit with resonances having $J^{P C} = 2^{++}$ at 1275 MeV, $0^{++}$ at 1500 MeV, $2^{++}$ at…

hep-ex1999★ 20 cited

Partial Wave Analysis of $J / ψ \to γ (K^{+} K^{-} π^{+} π^{-})$

J. Z. Bai

BES data on $J / ψ \to γ (K^{+} K^{-} π^{+} π^{-})$ are presented. The $K^{*} K ˉ^{*}$ contribution peaks strongly near threshold. It is fitted with a broad $0^{-+}$ resonance with mass $M = 1800 \…

hep-ex1999★ 17 cited

Charmonium Decays to Axialvector plus Pseudoscalar Mesons

BES Collaboration, J. Z. Bai

A sample of 3.79 million psi(2S) decays observed in the BES detector is used to study the decays of charmonium to axialvector plus pseudoscalar mesons. The branching fraction for p…

hep-ex1998★ 33 cited

Study of the P-wave charmonium state χ_{cJ} in ψ(2S) decays

J. Z. Bai

The processes $ψ (2 S) \to γ π^{+} π^{-}$ , $γ K^{+} K^{-}$ and $γ p p ˉ$ have been studied using a sample of $3.7 \times 1 0^{6}$ produced $ψ (2 S)$ decays. We determine the total width of the $χ…

Partial Wave Analyses of J/ψ→γK+K− and γKS0​KS0​

Measurement of Inclusive Monmentum Spectra and Multiplicity Distributions of Charged Particles at s​∼2−5 GeV

First Evidence of Lambda Lambda-bar in χ_cJ Decays

Measurements of the Mass and Full-Width of the ηc​ Meson

Radiative Decay of the ψ(2S) into Two Pseudoscalar Mesons

Measurement of ψ(2S) decays to baryon pairs

Partial Wave Analysis of J/ψ→γ(K±KS0​π∓)

Measurement of the Inclusive Charm Cross Section at 4.03 GeV and 4.14 GeV

Partial Wave Analysis of J/ψ→γ(π+π−π+π−)

Partial Wave Analysis of J/ψ→γ(K+K−π+π−)

Charmonium Decays to Axialvector plus Pseudoscalar Mesons

Study of the P-wave charmonium state χ_{cJ} in ψ(2S) decays

Partial Wave Analyses of $J / ψ \to γ K^{+} K^{-}$ and $γ K_{S}^{0} K_{S}^{0}$

Measurement of Inclusive Monmentum Spectra and Multiplicity Distributions of Charged Particles at $s \sim 2 - 5$ GeV

Measurements of the Mass and Full-Width of the $η_{c}$ Meson

Measurement of $ψ (2 S)$ decays to baryon pairs

Partial Wave Analysis of $J / ψ \to γ (K^{\pm} K_{S}^{0} π^{\mp})$

Partial Wave Analysis of $J / ψ \to γ (π^{+} π^{-} π^{+} π^{-})$

Partial Wave Analysis of $J / ψ \to γ (K^{+} K^{-} π^{+} π^{-})$