Publications (243)487.37 Total impact

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ABSTRACT: Using a data sample of 106 million $\psi(3686)$ events collected with the BESIII detector operated at the BEPCII storage ring, we study for the first time the decay $\chi_{cJ}\to\phi K^{0}_S K^{\pm}\pi^{\mp}$ and $\chi_{cJ}\to\phi K^{+} K^{}\pi^{0}$ in the E1 radiative transition $\psi(3686)\to\gamma\chi_{cJ}$. The decays are dominated by the threebody decay $\chi_{cJ}\to \phi K^*(892)\bar{K}$. We measure branching fractions for this reaction via the neutral and charged $K^*(892)$ and find them consistent with each other within the expectation of isospin symmetry. In the $K\bar{K}\pi$ invariant mass distribution a structure near the $K^*(892)\bar{K}$ mass threshold is observed, and the corresponding mass and width are measured to be $1412\pm4(\mathrm{stat.})\pm8(\mathrm{sys.}) \mathrm{MeV}/c^2$ and $\Gamma$ = $84\pm12(\mathrm{stat.})\pm40(\mathrm{sys.}) \mathrm{MeV}$, respectively. The observed state favors an assignment to the $h_1(1380)$, considering its possible $J^{PC}$ and comparing its mass, width and decay mode to those reported in the Particle Data Group. 
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ABSTRACT: From December 2011 to May 2014, about 5 $\rm fb^{1}$ of data were taken with the BESIII detector at centerofmass energies between 3.810 GeV and 4.600 GeV to study the charmoniumlike states and higher excited charmonium states. The time integrated luminosity of the collected data sample is measured to a precision of 1% by analyzing events produced by the largeangle Bhabha scattering process. 
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ABSTRACT: Based on data samples collected with the BESIII detector at the BEPCII collider at nine center of mass energies from 4.21 to 4.42 GeV, we search for the production of e^{+}e^{}→ωχ_{cJ} (J=0, 1, 2). The process e^{+}e^{}→ωχ_{c0} is observed for the first time, and the Born cross sections at sqrt[s]=4.23 and 4.26 GeV are measured to be (55.4±6.0±5.9) and (23.7±5.3±3.5) pb, respectively, where the first uncertainties are statistical and the second are systematic. The ωχ_{c0} signals at the other seven energies and the e^{+}e^{}→ωχ_{c1} and ωχ_{c2} signals are not significant, and the upper limits on the cross sections are determined. By examining the ωχ_{c0} cross section as a function of center of mass energy, we find that it is inconsistent with the line shape of the Y(4260) observed in e^{+}e^{}→π^{+}π^{}J/ψ. Assuming the ωχ_{c0} signals come from a single resonance, we extract the mass and width of the resonance to be (4230±8±6) MeV/c^{2} and (38±12±2) MeV, respectively, and the statistical significance is more than 9σ.Physical Review Letters 03/2015; 114(9):092003. · 7.73 Impact Factor 
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ABSTRACT: We present the first upperlimit measurement of the branching fractions of the isospinviolating transitions $\chi_{c0,2} \rightarrow \pi^{0} \eta_{c}$. The measurements are performed using $106\times 10^{6}$ $\psi(3686)$ events accumulated with the BESIII detector at the BEPCII $e^{+}e^{}$ collider at a centerofmass energy corresponding to the $\psi(3686)$ mass. We obtained upper limits on the branching fractions at a 90\% confidence level of $B(\chi_{c0} \rightarrow \pi^{0} \eta_{c}) < 1.6 \times 10^{3}$ and $B(\chi_{c2} \rightarrow \pi^{0} \eta_{c}) < 3.2 \times 10^{3}$. 
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ABSTRACT: We report a measurement of the parameter $y_{CP}$ in $\ensuremath{D^0}\xspace\ensuremath{\overline{D}^{0}}\xspace$ oscillations performed by taking advantage of quantum coherence between pairs of $\ensuremath{D^0}\xspace \ensuremath{\overline{D}^{0}}\xspace$ mesons produced in $e^+e^$ annihilations near threshold. In this work, doublytagged $\ensuremath{D^0}\xspace \ensuremath{\overline{D}^{0}}\xspace$ events, where one $D$ decays to a $CP$ eigenstate and the other $D$ decays in a semileptonic mode, are reconstructed using a data sample of 2.92\,fb$^{1}$ collected with the BESIII detector at the centerofmass energy of $\sqrt{s}$ = 3.773\,GeV. We obtain $y_{CP} = (2.0\pm1.3\pm0.7)\%$, where the first uncertainty is statistical and the second is systematic. This result is compatible with the current world average. 
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ABSTRACT: Based on a sample of $2.25\times 10^{8} J/\psi$ events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay $J/\psi\to \eta \phi\pi^{+}\pi^{}$. The $Y(2175)$ resonance is observed in the invariant mass spectrum of $\phi f_{0}(980)$ with a statistical significance of greater than $10\sigma$. The corresponding mass and width are determined to be $M=2200\pm 6 \mathrm{(stat.)} \pm 5\mathrm{(syst.)} \mathrm{MeV}/c^{2}$ and $\Gamma=104\pm 15\mathrm{(stat.)}\pm 15\mathrm{(syst.)}$ MeV, respectively, and the product branching fraction is measured to be $\mathcal{B}(J/\psi\to\eta Y(2175)$, $Y(2175)\to \phi f_{0}(980)$, $f_{0}(980)\to \pi^{+}\pi^{})= (1.20\pm 0.14\mathrm{(stat.)}\pm 0.37 \mathrm{(syst.)})\times 10^{4}$. The results are consistent within errors with those of previous experiments. We also measure the branching fraction of $J/\psi\to \phi f_1(1285)$ with $f_1(1285)\to \eta\pi^{+}\pi^{}$ and set upper limits on the branching fractions for $J/\psi\to \phi\eta(1405)$/$\phi X(1835)$/$\phi X(1870)$ with $\eta(1405)$/$X(1835)$/$X(1870)\to \eta\pi^{+}\pi^{}$ at the 90\% confidence level. 
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ABSTRACT: Using 482 pb$^{1}$ of data taken at $\sqrt{s}=4.009$ GeV, we measure the branching fractions of the decays of $D^{*0}$ into $D^0\pi^0$ and $D^0\gamma$ to be $\BR(D^{*0} \to D^0\pi^0)=(65.5\pm 0.8\pm 0.5)%$ and $\BR(D^{*0} \to D^0\gamma)=(34.5\pm 0.8\pm 0.5)%$ respectively, by assuming that the $D^{*0}$ decays only into these two modes. The ratio of the two branching fractions is $\BR(D^{*0} \to D^0\pi^0)/\BR(D^{*0} \to D^0\gamma) =1.90\pm 0.07\pm 0.05$, which is independent of the assumption made above. The first uncertainties are statistical and the second ones systematic. The precision is improved by a factor of three compared to the present world average values. 
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ABSTRACT: Using data samples collected at centerofmass energies $\sqrt{s} = 4.23$, 4.26, and 4.36~GeV with the BESIII detector operating at the BEPCII storage ring, we search for the production of the charmoniumlike state $Y(4140)$ through a radiative transition followed by its decay to $\phi J/\psi$. No significant signal is observed and upper limits on $\sigma[e^{+} e^{} \rightarrow \gamma Y(4140)] \cdot \mathcal{B}(Y(4140)\rightarrow \phi J/\psi)$ at the $90\%$ confidence level are estimated as 0.35, 0.28, and 0.33~pb at $\sqrt{s} = 4.23$, 4.26, and 4.36~GeV, respectively. 
Article: Evidence for $e^+e^\to\gamma\chi_{c1, 2}$ at centerofmass energies from 4.009 to 4.360 GeV
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ABSTRACT: Using data samples collected at centerofmass energies of $\sqrt{s}$ = 4.009, 4.230, 4.260, and 4.360 GeV with the BESIII detector operating at the BEPCII collider, we perform a search for the process $e^+e^\to\gamma\chi_{cJ}$ $(J = 0, 1, 2)$ and find evidence for $e^+e^\to\gamma\chi_{c1}$ and $e^+e^\to\gamma\chi_{c2}$ with statistical significances of 3.0$\sigma$ and 3.4$\sigma$, respectively. The Born cross sections $\sigma^{B}(e^+e^\to\gamma\chi_{cJ})$, as well as their upper limits at the 90% confidence level are determined at each centerofmass energy. 
Article: Observation of e^{+}e^{}→π^{0}π^{0}h_{c} and a Neutral Charmoniumlike Structure Z_{c}(4020)^{0}
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ABSTRACT: Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider at centerofmass energies of sqrt[s]=4.23, 4.26, and 4.36 GeV, we observe e^{+}e^{}→π^{0}π^{0}h_{c} for the first time. The Born cross sections are measured and found to be about half of those of e^{+}e^{}→π^{+}π^{}h_{c} within less than 2σ. In the π^{0}h_{c} mass spectrum, a structure at 4.02 GeV/c^{2} is found. It is most likely to be the neutral isospin partner of the Z_{c}(4020)^{±} observed in the process of e^{+}e^{}→π^{+}π^{}h_{c} being found. A fit to the π^{0}h_{c} invariant mass spectrum, with the width of the Z_{c}(4020)^{0} fixed to that of its charged isospin partner and possible interferences with nonZ_{c}(4020)^{0} amplitudes neglected, gives a mass of (4023.9±2.2±3.8) MeV/c^{2} for the Z_{c}(4020)^{0}, where the first error is statistical and the second systematic.Physical Review Letters 11/2014; 113(21):212002. · 7.73 Impact Factor 
Article: The Physics of the B Factories
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ABSTRACT: This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C.European Physical Journal C 11/2014; DOI:10.1140/epjc/s1005201430269 · 5.25 Impact Factor 
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ABSTRACT: Using a sample of $2.25\times 10^8$ $J/\psi$ events collected with the BESIII detector at the BEPCII collider, we search for the $J/\psi$ semileptonic weak decay $J/\psi \to D^{}_{s} e^{+}\nu_{e}+c.c.$ with a much higher sensitivity than previous searches. We also perform the first search for $J/\psi \to D^{*}_{s} e^{+}\nu_{e}+c.c.$ No significant excess of a signal above background is observed in either channel. At the $90\%$ confidence level, the upper limits are determined to be $\mathcal{B}(J/\psi \to D^{}_{s}e^{+}\nu_{e}+c.c.)<1.3\times10^{6}$ and $\mathcal{B}(J/\psi \to {D^{*}_{s}}^{}e^{+}\nu_{e}+c.c.)<1.8\times10^{6}$, respectively. Both are consistent with Standard Model predictions. 
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ABSTRACT: Based on data samples collected with the BESIII detector at the BEPCII collider at 9 centerofmass energies from 4.21 to 4.42 GeV, we search for the production of $e^+e^\to \omega\chi_{cJ}$ ($J$=0, 1, 2). The process $e^+e^\to \omega\chi_{c0}$ is observed for the first time, and the Born cross sections at $\sqrt{s}$=4.23 and 4.26 GeV are measured to be $(55.4\pm 6.0\pm 5.9)$ and $(23.7\pm 5.3\pm 3.5)$ pb, respectively, where the first uncertainties are statistical and the second are systematic. The $\omega\chi_{c0}$ signals at the other 7 energies and $e^+e^\to \omega\chi_{c1}$ and $\omega\chi_{c2}$ signals are not significant, and the upper limits on the cross sections are determined. By examining the $\omega\chi_{c0}$ cross section as a function of centerofmass energy, we find that it is inconsistent with the line shape of the $Y(4260)$ observed in $e^+ e^\to\pi^+\pi^J/\psi$. 
Article: Observation of $e^+e^\to \pi^0\pi^0 h_c$ and a neutral charmoniumlike structure $Z_c(4020)^0$
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ABSTRACT: Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider at centerofmass energies of $\sqrt{s}$=4.23, 4.26, and 4.36 GeV, we observe $e^+e^\to \pi^0\pi^0 h_c$ for the first time. The Born cross sections are measured and found to be about half of those of $e^+e^ \to \pi^+\pi^h_c$ within less than 2$\sigma$. In the $\pi^0h_c$ mass spectrum, a structure at 4.02~GeV/$c^2$ that is most likely the neutral isospin partner of the $Z_c(4020)^{\pm}$ observed in the process of $e^+e^ \to \pi^+\pi^h_c$ is found. A fit to the $\pi^0 h_c$ invariant mass spectrum with the width of the $Z_c(4020)^0$ fixed to that of its charged isospin partner and possible interferences with non$Z_c(4020)^0$ amplitudes neglected, gives a mass of ($4023.9\pm 2.2 \pm 3.8$)~MeV/$c^2$ for the $Z_c(4020)^0$, where the first error is statistical and the second systematic. 
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ABSTRACT: Using $1.06\times10^8$ $\psi(3686)$ events recorded in $e^{+}e^{}$ collisions at $\sqrt{s}=$ 3.686 GeV with the BESIII at the BEPCII collider, we present searches for Cparity violation in $J/\psi \to \gamma\gamma$ and $ \gamma \phi$ decays via $\psi(3686) \to J/\psi \pi^+\pi^$. No significant signals are observed in either channel. Upper limits on the branching fractions are set to be $\mathcal{B}(J/\psi \to \gamma\gamma) < 2.7 \times 10^{7}$ and $\mathcal{B}(J/\psi \to \gamma\phi) < 1.4 \times 10^{6}$ at the 90\% confidence level. The former is one order of magnitude more stringent than the previous upper limit, and the latter represents the first limit on this decay channel. 
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ABSTRACT: Using $2.25\times10^{8}$ $J/\psi$ events collected with the BESIII detector at the BEPCII storage rings, we observe for the first time the process $J/\psi\rightarrow p\bar{p}a_{0}(980)$, $a_{0}(980)\rightarrow \pi^{0}\eta$ with a significance of $6.5\sigma$ ($3.2\sigma$ including systematic uncertainties). The product branching fraction of $J/\psi\rightarrow p\bar{p}a_{0}(980)\rightarrow p\bar{p}\pi^{0}\eta$ is measured to be $(6.8\pm1.2\pm1.5)\times 10^{5}$, where the first error is statistical and the second is systematic. This measurement provides information on the $a_{0}$ production near threshold coupling to $p\bar{p}$ and improves the understanding of the dynamics of $J/\psi$ decays to four body processes. 
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ABSTRACT: Using a sample of 1.3×10^{9} J/ψ events collected with the BESIII detector, we report the first observation of η^{'}→π^{+}π^{}π^{+}π^{} and η^{'}→π^{+}π^{}π^{0}π^{0}. The measured branching fractions are B(η^{'}→π^{+}π^{}π^{+}π^{})=[8.53±0.69(stat.)±0.64(syst.)]×10^{5} and B(η^{'}→π^{+}π^{}π^{0}π^{0})=[1.82±0.35(stat.)±0.18(syst.)]×10^{4}, which are consistent with theoretical predictions based on a combination of chiral perturbation theory and vectormeson dominance.Physical Review Letters 06/2014; 112(25):251801. · 7.73 Impact Factor 
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ABSTRACT: The process $e^+e^\rightarrow p\overline{p}\pi^0$ has been studied by analyzing data collected at $\sqrt{s}=3.773$ GeV, at $\sqrt{s}=3.650$ GeV, and during a $\psi(3770)$ line shape scan with the BESIII detector at the BEPCII collider. The Born cross section of $p \overline{p} \pi^0$ in the vicinity of the $\psi(3770)$ is measured and the Born cross section of $\psi(3770)\rightarrow p \overline{p} \pi^0$ is extracted considering interference between resonant and continuum production amplitudes. Two solutions with the same probability and a significance of 1.5$\sigma$ are found, and the Born cross section of $\psi(3770)\rightarrow p \overline{p} \pi^0$ is determined to be less than 0.22 pb at 90% confidence level and $33.8\pm1.8\pm2.1$ pb, respectively. Using the estimated cross section and a constant decay amplitude approximation, the cross section $\sigma(p\overline{p} \rightarrow \psi(3770) \pi^0)$ is calculated for the kinematic situation of the planned $\overline{\text{P}}\text{ANDA}$ experiment. The maximum cross section corresponding to the two solutions is expected to be less than $0.79$ nb at 90% confidence level and $122\pm10$ nb at a center of mass energy of 5.26 GeV. 
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ABSTRACT: By using a 2.92 fb$^{1}$ data sample taken at $\sqrt{s} = 3.773$ GeV with the BESIII detector operating at the BEPCII collider, we search for the radiative transitions $\psi(3770)\to\gamma\eta_c$ and $\gamma\eta_c(2S)$ through the hadronic decays $\eta_c(\eta_c(2S))\to K^0_SK^\pm\pi^\mp$. No significant excess of signal events above background is observed. We set upper limits at a 90% confidence level for the product branching fractions to be $\mathcal{B}(\psi(3770)\to\gamma\eta_c)\times \mathcal{B}(\eta_c\to K^0_SK^\pm\pi^\mp) < 1.6\times10^{5}$ and $\mathcal{B}(\psi(3770)\to\gamma\eta_c(2S))\times \mathcal{B}(\eta_c(2S)\to K^0_SK^\pm\pi^\mp) < 5.6\times10^{6}$. Combining our result with worldaverage values of $\mathcal{B}(\eta_c(\eta_c(2S))\to K^0_SK^\pm\pi^\mp)$, we find the branching fractions $\mathcal{B}(\psi(3770)\to\gamma\eta_c) < 6.8\times10^{4}$ and $\mathcal{B}(\psi(3770)\to\gamma\eta_c(2S)) < 2.0\times10^{3}$ at a 90% confidence level. 
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ABSTRACT: With $1.06\times 10^8$ $\psi(3686)$ events collected with the BESIII detector, the branching fraction of $\psi(3686) \to \omega K^+ K^$ is measured to be $(1.54 \pm 0.04 \pm 0.11) \times 10^{4}$. This is the most precise result to date, due to the largest $\psi(3686)$ sample, improved signal reconstruction efficiency, good simulation of the detector performance, and a more accurate knowledge of the continuum contribution. Using the branching fraction of $J/\psi \to \omega K^+ K^$, the ratio $\mathcal{B}(\psi(3868) \to K^+K^) / \mathcal{B}(J/\psi \to K^+K^)$ is determined to be $(18.4 \pm 3.7)\,\%$. This constitutes a significantly improved test of the $12\,\%$ rule, with the uncertainty now dominated by the $J/\psi$ branching fraction.
Publication Stats
2k  Citations  
487.37  Total Impact Points  
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Institutions

2008–2012

Institute of physics china
Peping, Beijing, China 
University of Toronto
Toronto, Ontario, Canada


2010

RuhrUniversität Bochum
Bochum, North RhineWestphalia, Germany


2005–2010

Government of the People's Republic of China
Peping, Beijing, China


1984–2010

Nankai University
T’ienchingshih, Tianjin Shi, China


2001

Colorado State University
 Department of Physics
Fort Collins, Colorado, United States


1999

National Tsing Hua University
 Nuclear Science and Technology Development Center
Hsinchuhsien, Taiwan, Taiwan


1998

Hangzhou University
Shanghai, Shanghai Shi, China
