Yiyun Zhang

activity

20032009

most citedDesign and Construction of the BESIII Detector

1.2k citations · 2.3k across the 21 of their papers we have counts for

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19 papers · 1 filter

hep-ex2007★ 4 cited

Direct Measurements of the Branching Fractions for Inclusive $K^{\pm}$ and Inclusive Semileptonic Decays of $D^{+}$ and $D^{0}$ Mesons

BES Collaboration

With singly-tagged $D ˉ$ samples selected from the data collected at and around 3.773 GeV with the BESII detector at the BEPC collider, we have measured the branching fractions…

hep-ex2007★ 11 cited

Experimental studies of the $π^{+} π^{-} π^{+} π^{-} π^{0}$ , $K^{+} K^{-} π^{+} π^{-} π^{0}$ and $p p ˉ π^{+} π^{-} π^{0}$ final states produced in $e^{+} e^{-}$ annihilation at $s =$ 3.773 and 3.650 GeV

The BES Collaboration

We report measurements of the observed cross sections for $e^{+} e^{-} \to ω π^{+} π^{-}$ , $ω K^{+} K^{-}$ , $ω p p ˉ$ , $K^{+} K^{-} ρ^{0} π^{0}$ , $K^{+} K^{-} ρ^{+} π^{-} + c . c .$ , $K^{* 0} K^{-} π^{+} π^{0} + c . c .$ , $K^{*+}K^-π^+π^-+c…

hep-ex2007★ 16 cited

Measurements of the observed cross sections for exclusive light hadron production in e^+e^- annihilation at \sqrt{s}= 3.773 and 3.650 GeV

The BES Collaboration

By analyzing the data sets of 17.3 pb $^{- 1}$ taken at $s = 3.773$ GeV and 6.5 pb $^{- 1}$ taken at $s = 3.650$ GeV with the BESII detector at the BEPC collider, we have mea…

hep-ex2007★ 7 cited

First observation of J/ψand ψ(2S) decaying to n K^0_S\barΛ+c.c

BES Collaboration

The decays of $\jpsi$ and $\psip$ to $n K_{S}^{0} Λ ˉ + c . c .$ are observed and measured for the first time, and the perturbative QCD ``12%'' rule is tested, based on $5.8 \times 10^7…

hep-ex2007★ 52 cited

Search for the Invisible Decay of $\jpsi$ in $ψ (2 S) \to π + π^{-} J / ψ$

M. Ablikim, J. Z. Bai

Using 14.0 million $ψ (2 S) e v e n t sco l l ec t e d w i t h t h e B E S - I I d e t ec t or, a se a r c h f or t h e d ec a y o f t h e$ \jpsi $t o anin v i s ib l e f ina l s t a t e in$ \psipto $i s p er f or m e d . T h e$ \jpsi$ peak i…

hep-ex2007★ 5 cited

Search for the Rare Decays $J / ψ \to D_{S}^{-} π^{+}$ , $J / ψ \to D^{-} π^{+}$ , and $J / ψ \to D ˉ^{0} K ˉ^{0}$

BES collaboration

Rare decay modes $J / ψ \to D_{S}^{-} π^{+} + c . c .$ , $J / ψ \to D^{-} π^{+} + c . c .$ , and $J / ψ \to D ˉ^{0} K ˉ^{0} + c . c .$ are searched for using 5.77 $\times 1 0^{7}$ $J / ψ$ events col…

hep-ex2007★ 22 cited

Measurements of the observed cross sections for $e^{+} e^{-} \to$ light hadrons at $s =$ 3.773 and 3.650 GeV

BES Collaboration

Using the data sets of 17.3 pb $^{- 1}$ collected at $s =$ 3.773 GeV and 6.5 pb $^{- 1}$ collected at $s =$ 3.650 GeV with the BESII detector at the BEPC collider, we have…

hep-ex2006★ 33 cited

Precison Measurements of the Mass, the Widths of $ψ (3770)$ Resonance and the Cross Section $σ [e^{+} e^{-} \to ψ (3770)]$ at $E_{cm} = 3.7724$ GeV

M. Ablikim et al.

By analyzing the $R$ values measured at 68 energy points in the energy region between 3.650 and 3.872 GeV reported in our previous paper, we have precisely measured the mass, the t…

hep-ex2006★ 10 cited

Direct measurement of the absolute branching fraction for $D^{+} \to K ˉ^{0} μ^{+} ν_{μ}$ and determination of $Γ (D^{0} \to K^{-} μ^{+} ν_{μ}) /Γ (D^{+} \to K ˉ^{0} μ^{+} ν_{μ})$

M. Ablikim

The absolute branching fraction for the decay $D^{+} \to K ˉ^{0} μ^{+} ν_{μ}$ is determined using $5321 \pm 149 \pm 160$ singly tagged $D^{-}$ sample from the data collected around 3.773 G…

hep-ex2006★ 99 cited

Measurements of the cross sections for $e^{+} e^{-} \to hadrons$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $ψ (3770) \to non - D D ˉ$

M. Ablikim et al.

Using the BES-II detector at the BEPC Collider, we measured the lowest order cross sections and the $R$ values ( $R = σ_{e^{+} e^{-} \to hadrons}^{0} / σ_{e^{+} e^{-} \to μ^{+} μ^{-}}^{0}$ ) for incl…

hep-ex2005★ 66 cited

A measurement of the CP-conserving component of the decay KS -> pi+ pi- pi0

NA48 Collaboration

The NA48 collaboration has measured the amplitude of the CP-conserving component of the decay KS --> pi+ pi- pi0 relative to KL --> pi+ pi- pi0. For the characteristic parameter la…

hep-ex2005★ 66 cited

Measurement of the cross section for e^+e^- -> ppbar at center-of-mass energies from 2.0 to 3.07 GeV

M. Ablikim

Cross sections for e^+e^- -> ppbar have been measured at 10 center-of-mass energies from 2.0 to 3.07 GeV by the BESII experiment at the BEPC, and proton electromagnetic form factor…

hep-ex2005★ 5 cited

Measurements of Cabibbo Suppressed Hadronic Decay Fractions of Charmed D0 and D+ Mesons

BES Collaboration

Using data collected with the BESII detector at $e^{+} e^{-}$ storage ring Beijing Electron Positron Collider, the measurements of relative branching fractions for seven Cabibbo sup…

hep-ex2004★ 30 cited

Direct Measurement of the Pseudoscalar Decay Constant fD+

BES Collaboration

The absolute branching fraction of $D^{+} \to μ^{+} ν$ has been directly measured by an analysis of a data sample of about 33 $p b^{- 1}$ collected around $s = 3.773$ GeV with…

hep-ex2004★ 97 cited

The $σ$ pole in $J / ψ \to ω π^{+} π^{-}$

BES Collaboration

Using a sample of 58 million $J / ψ$ events recorded in the BESII detector, the decay $J / ψ \to ω π^{+} π^{-}$ is studied. There are conspicuous $ω f_{2} (1270)$ and $b_{1} (1235) π$ signals. At lo…

hep-ex2004★ 57 cited

Observation of a threshold enhancement in the p \bar{Lambda} invariant mass spectrum

BES Collaboration, M. Ablikim

An enhancement near the m_p + M_Λ mass threshold is observed in the combined p \barΛ and \bar{p}Λinvariant mass spectrum from J/ψ--> p K^- \bar{Lambda} + c.c. decays. It can be fit…

hep-ex2004★ 25 cited

Measurements of J/psi --> p \bar{p}

J. Z. Bai

The process J/ψ--> p \bar{p} is studied using 57.7 X 10^6 J/ψevents collected with the BESII detector at the Beijing Electron Positron Collider. The branching ratio is determined t…

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★ 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-…

Direct Measurements of the Branching Fractions for Inclusive K± and Inclusive Semileptonic Decays of D+ and D0 Mesons

Experimental studies of the π+π−π+π−π0, K+K−π+π−π0 and ppˉ​π+π−π0 final states produced in e+e− annihilation at s​= 3.773 and 3.650 GeV

Measurements of the observed cross sections for exclusive light hadron production in e^+e^- annihilation at \sqrt{s}= 3.773 and 3.650 GeV

First observation of J/ψand ψ(2S) decaying to n K^0_S\barΛ+c.c

Search for the Invisible Decay of $\jpsi$ in ψ(2S)→π+π−J/ψ

Search for the Rare Decays J/ψ→DS−​π+, J/ψ→D−π+, and J/ψ→Dˉ0Kˉ0

Measurements of the observed cross sections for e+e−→ light hadrons at s​= 3.773 and 3.650 GeV

Precison Measurements of the Mass, the Widths of ψ(3770) Resonance and the Cross Section σ[e+e−→ψ(3770)] at Ecm​=3.7724 GeV

Direct measurement of the absolute branching fraction for D+→Kˉ0μ+νμ​ and determination of Γ(D0→K−μ+νμ​)/Γ(D+→Kˉ0μ+νμ​)

Measurements of the cross sections for e+e−→hadrons at 3.650, 3.6648, 3.773 GeV and the branching fraction for ψ(3770)→non−DDˉ

A measurement of the CP-conserving component of the decay KS -> pi+ pi- pi0

Measurement of the cross section for e^+e^- -> ppbar at center-of-mass energies from 2.0 to 3.07 GeV

Measurements of Cabibbo Suppressed Hadronic Decay Fractions of Charmed D0 and D+ Mesons

Direct Measurement of the Pseudoscalar Decay Constant fD+

The σ pole in J/ψ→ωπ+π−

Observation of a threshold enhancement in the p \bar{Lambda} invariant mass spectrum

Measurements of J/psi --> p \bar{p}

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

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

Direct Measurements of the Branching Fractions for Inclusive $K^{\pm}$ and Inclusive Semileptonic Decays of $D^{+}$ and $D^{0}$ Mesons

Experimental studies of the $π^{+} π^{-} π^{+} π^{-} π^{0}$ , $K^{+} K^{-} π^{+} π^{-} π^{0}$ and $p p ˉ π^{+} π^{-} π^{0}$ final states produced in $e^{+} e^{-}$ annihilation at $s =$ 3.773 and 3.650 GeV

Search for the Invisible Decay of $\jpsi$ in $ψ (2 S) \to π + π^{-} J / ψ$

Search for the Rare Decays $J / ψ \to D_{S}^{-} π^{+}$ , $J / ψ \to D^{-} π^{+}$ , and $J / ψ \to D ˉ^{0} K ˉ^{0}$

Measurements of the observed cross sections for $e^{+} e^{-} \to$ light hadrons at $s =$ 3.773 and 3.650 GeV

Precison Measurements of the Mass, the Widths of $ψ (3770)$ Resonance and the Cross Section $σ [e^{+} e^{-} \to ψ (3770)]$ at $E_{cm} = 3.7724$ GeV

Direct measurement of the absolute branching fraction for $D^{+} \to K ˉ^{0} μ^{+} ν_{μ}$ and determination of $Γ (D^{0} \to K^{-} μ^{+} ν_{μ}) /Γ (D^{+} \to K ˉ^{0} μ^{+} ν_{μ})$

Measurements of the cross sections for $e^{+} e^{-} \to hadrons$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $ψ (3770) \to non - D D ˉ$

The $σ$ pole in $J / ψ \to ω π^{+} π^{-}$