Tsinghua University

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2003 · hep-exShow all

13 papers · 2 filters

hep-ex2003★ 6 cited

Search for K_S K_S in J/psi and psi(2S) decays

J. Z. Bai, BES Collaboration

The CP violating processes J/psi-->K_S K_S and psi(2S)-->K_S K_S are searched for using samples of 58 million J/psi and 14 million psi(2S) events collected with the Beijing Spectro…

hep-ex2003★ 32 cited

First observation of psi(2S)-->K_S K_L

J. Z. Bai

The decay psi(2S)-->K_S K_L is observed for the first time using psi(2S) data collected with the Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC); the…

hep-ex2003★ 27 cited

Improved measurement of the branching ratio of J/psi-->K_S K_L

J. Z. Bai

The branching ratio of J/psi-->K_S K_L is measured with improved precision to be B(J/psi-->K_S K_L) = (1.82\pm 0.04\pm 0.13)\times 10^{-4}. using J/psi data collected with the Beij…

hep-ex2003★ 14 cited

Measurement of Branching Ratios for $η_{c}$ Hadronic Decays

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 decay channels: $η_{c} \to K^{+} K^{-} π^{+} π^{-}$ , $π^{+} π^{-} π^{+} π^{-}$ , $K^\…

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★ 70 cited

Evidence of psi(3770) non-DD-bar Decay to J/psi pi+pi-

BES Collaboration

Evidence of $ψ (3770)$ decays to a non- $D D ˉ$ final state is observed. A total of $11.8 \pm 4.8 \pm 1.3$ $ψ(3770) \to \PPJP$ events are obtained from a data sample of 27.7 $\r…

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★ 41 cited

Aging Studies for the Large Honeycomb Drift Tube System of the Outer Tracker of HERA-B

B Outer Tracker Group, H. Albrecht

The HERA-B Outer Tracker consists of drift tubes folded from polycarbonate foil and is operated with Ar/CF4/CO2 as drift gas. The detector has to stand radiation levels which are s…

hep-ex2003★ 12 cited

Effective Dynamic Range in Measurements with Flash Analog-to-Digital Convertor

Q. Yue

Flash Analog to Digital Convertor (FADC) is frequently used in nuclear and particle physics experiments, often as the major component in big multi-channel systems. The large data v…

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★ 309 cited

Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays

BES Collaboration, J. Z. Bai, Y. Ban +1

We observe a narrow enhancement near 2mp in the invariant mass spectrum of ppbar pairs from radiative J/psi-->gamma ppbar decays. The enhancement can be fit with either an S- or P-…

hep-ex2003★ 15 cited

Search for Lepton Flavor Violation Process J/ $ψ \to e μ$

J. Z. Bai

Using a sample of 5.8X10E7 J/ $ψ$ events, the Beijing Spectrometer experiment has searched for the decay J/ $ψ \to e μ$ . Four candidates, consistent with the estimated background, are…

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: $γ K^{+} K^{-} π^{+} π^{-}$ , $γ π^{+} π^{-} π^{+} π^{-}$ ,…

Search for K_S K_S in J/psi and psi(2S) decays

First observation of psi(2S)-->K_S K_L

Improved measurement of the branching ratio of J/psi-->K_S K_L

Measurement of Branching Ratios for ηc​ Hadronic Decays

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

Evidence of psi(3770) non-DD-bar Decay to J/psi pi+pi-

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

Aging Studies for the Large Honeycomb Drift Tube System of the Outer Tracker of HERA-B

Effective Dynamic Range in Measurements with Flash Analog-to-Digital Convertor

First Evidence of Lambda Lambda-bar in χ_cJ Decays

Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays

Search for Lepton Flavor Violation Process J/ψ→eμ

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

Measurement of Branching Ratios for $η_{c}$ Hadronic 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

Search for Lepton Flavor Violation Process J/ $ψ \to e μ$

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