Publications (170)1026.35 Total impact

Article: Evidence for $e^+e^\to\gamma\chi_{c1, 2}$ at centerofmass energies from 4.009 to 4.360 GeV
[Show abstract] [Hide abstract]
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.11/2014;  [Show abstract] [Hide abstract]
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.10/2014;  [Show abstract] [Hide abstract]
ABSTRACT: A search for scalar particles decaying via narrow resonances into two photons in the mass range 65600 GeV is performed using 20.3 fb^{1} of sqrt[s]=8 TeV pp collision data collected with the ATLAS detector at the Large Hadron Collider. The recently discovered Higgs boson is treated as a background. No significant evidence for an additional signal is observed. The results are presented as limits at the 95% confidence level on the production cross section of a scalar boson times branching ratio into two photons, in a fiducial volume where the reconstruction efficiency is approximately independent of the event topology. The upper limits set extend over a considerably wider mass range than previous searches.Physical Review Letters 10/2014; 113(17):171801. · 7.73 Impact Factor  [Show abstract] [Hide abstract]
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 $e^+ e^\to\pi^+\pi^J/\psi$.10/2014;  [Show abstract] [Hide abstract]
ABSTRACT: This Letter presents the first study of W^{±}W^{±}jj, sameelectriccharge diboson production in association with two jets, using 20.3 fb^{1} of protonproton collision data at sqrt[s]=8 TeV recorded by the ATLAS detector at the Large Hadron Collider. Events with two reconstructed samecharge leptons (e^{±}e^{±}, e^{±}μ^{±}, and μ^{±}μ^{±}) and two or more jets are analyzed. Production cross sections are measured in two fiducial regions, with different sensitivities to the electroweak and strong production mechanisms. First evidence for W^{±}W^{±}jj production and electroweakonly W^{±}W^{±}jj production is observed with a significance of 4.5 and 3.6 standard deviations, respectively. The measured production cross sections are in agreement with standard model predictions. Limits at 95% confidence level are set on anomalous quartic gauge couplings.Physical Review Letters 10/2014; 113(14):141803. · 7.73 Impact Factor 
Article: Observation of $e^+e^\to \pi^0\pi^0 h_c$ and a neutral charmoniumlike structure $Z_c(4020)^0$
[Show abstract] [Hide abstract]
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.09/2014;  [Show abstract] [Hide abstract]
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.09/2014;  [Show abstract] [Hide abstract]
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.08/2014;  [Show abstract] [Hide abstract]
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  [Show abstract] [Hide abstract]
ABSTRACT: Measurements of fourlepton (4ℓ, ℓ=e,μ) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and fourlepton invariant mass regions m_{ℓ^{+}ℓ^{}}>5 GeV and 80<m_{4ℓ}<100 GeV, the measured cross sections are 76±18(stat)±4(syst)±1.4(lumi) fb and 107±9(stat)±4(syst)±3.0(lumi) fb at sqrt[s]=7 and 8 TeV, respectively. By subtracting the nonresonant 4ℓ production contributions and normalizing with Z→μ^{+}μ^{} events, the branching fraction for the Z boson decay to 4ℓ is determined to be (3.20±0.25(stat)±0.13(syst))×10^{6}, consistent with the standard model prediction.Physical Review Letters 06/2014; 112(23):231806. · 7.73 Impact Factor  [Show abstract] [Hide abstract]
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.06/2014;  Materials Research Bulletin 06/2014; 54:6–12. · 1.97 Impact Factor
 [Show abstract] [Hide abstract]
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.05/2014;  [Show abstract] [Hide abstract]
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.05/2014;  [Show abstract] [Hide abstract]
ABSTRACT: An energy scan near the $\tau$ pair production threshold has been performed using the BESIII detector. About $24$ pb$^{1}$ of data, distributed over four scan points, was collected. This analysis is based on $\tau$ pair decays to $ee$, $e\mu$, $eh$, $\mu\mu$, $\mu h$, $hh$, $e\rho$, $\mu\rho$ and $\pi\rho$ final states, where $h$ denotes a charged $\pi$ or $K$. The mass of the $\tau$ lepton is measured from a maximum likelihood fit to the $\tau$ pair production cross section data to be $m_{\tau} = (1776.91\pm0.12 ^{+0.10}_{0.13}$) MeV/$c^2$, which is currently the most precise value in a single measurement.Physical Review D 05/2014; 90(1). · 4.86 Impact Factor 
Article: Measurement of the $D\to K^\pi^+$ strong phase difference in $\psi(3770)\to D^0\overline{D}{}^0$
[Show abstract] [Hide abstract]
ABSTRACT: We study $D^0\overline{D}{}^0$ pairs produced in $e^+e^$ collisions at $\sqrt{s}=3.773$ GeV using a data sample of 2.92 fb$^{1}$ collected with the BESIII detector. We measure the asymmetry $\mathcal{A}^{CP}_{K\pi}$ of the branching fractions of $D \to K^\pi^+$ in $CP$odd and $CP$even eigenstates to be $(12.7\pm1.3\pm0.7)\times10^{2}$. $\mathcal{A}^{CP}_{K\pi}$ can be used to extract the strong phase difference $\delta_{K\pi}$ between the doubly Cabibbosuppressed process $\overline{D}{}^{0}\to K^\pi^+$ and the Cabibbofavored process $D^0\to K^ \pi^+$. Using worldaverage values of external parameters, we obtain $\cos\delta_{K\pi} = 1.02\pm0.11\pm0.06\pm0.01$. Here, the first and second uncertainties are statistical and systematic, respectively, while the third uncertainty arises from the external parameters. This is the most precise measurement of $\delta_{K\pi}$ to date.04/2014;  [Show abstract] [Hide abstract]
ABSTRACT: We study the process e+e→(D*D¯*)±π∓ at a centerofmass energy of 4.26 GeV using a 827 pb1 data sample obtained with the BESIII detector at the Beijing Electron Positron Collider. Based on a partial reconstruction technique, the Born cross section is measured to be (137±9±15) pb. We observe a structure near the (D*D¯*)± threshold in the π∓ recoil mass spectrum, which we denote as the Zc±(4025). The measured mass and width of the structure are (4026.3±2.6±3.7) MeV/c2 and (24.8±5.6±7.7) MeV, respectively. Its production ratio σ(e+e→Zc±(4025)π∓→(D*D¯*)±π∓)/σ(e+e→(D*D¯*)±π∓) is determined to be 0.65±0.09±0.06. The first uncertainties are statistical and the second are systematic.Physical Review Letters 04/2014; 112(13):132001. · 7.73 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Using a sample of $1.3\times 10^9$ $J/\psi$ events collected with the BESIII detector, we report the first observation of $\eta^{\prime}\to\pi^{+}\pi^{}\pi^{+}\pi^{}$ and $\eta^{\prime}\to\pi^{+}\pi^{}\pi^{0}\pi^{0}$. The measured branching fractions are $\mathcal{B}$($\eta^{\prime}\to\pi^{+}\pi^{}\pi^{+}\pi^{}$) = $(8.41\pm0.68({\rm stat.})\pm0.63({\rm syst.}))\times10^{5}$ and $\mathcal{B}$($\eta^{\prime}\to\pi^{+}\pi^{}\pi^{0}\pi^{0}$) = $(1.90\pm0.36({\rm stat.})\pm0.19({\rm syst.}))\times10^{4}$, which are consistent with theoretical predictions based on a combination of chiral perturbation theory and vectormeson dominance.03/2014;  [Show abstract] [Hide abstract]
ABSTRACT: Based on a sample of (225.3\pm2.8)\times 10^{6} J/\psi events collected with the BESIII detector, the electromagnetic Dalitz decays of J/\psi \to P e^+e^(P=\eta'/\eta/\pi^0) are studied. By reconstructing the pseudoscalar mesons in various decay modes, the decays J/\psi \to \eta' e^+e^, J/\psi \to \eta e^+e^ and J/\psi \to \pi^0 e^+e^ are observed for the first time. The branching fractions are determined to be \mathcal{B}(J/\psi\to \eta' e^+e^) = (5.81\pm0.16\pm0.31)\times10^{5}, \mathcal{B}(J/\psi\to \eta e^+e^) = (1.16\pm0.07\pm0.06)\times10^{5}, and \mathcal{B}(J/\psi\to \pi^0 e^+e^)=(7.56\pm1.32\pm0.50)\times10^{7}, where the first errors are statistical and the second ones systematic.03/2014;  [Show abstract] [Hide abstract]
ABSTRACT: Using 2917 $\rm{pb}^{1}$ of data accumulated at 3.773~$\rm{GeV}$, 44.5~$\rm{pb}^{1}$ of data accumulated at 3.65~$\rm{GeV}$ and data accumulated during a $\psi(3770)$ lineshape scan with the BESIII detector, the reaction $e^+e^\rightarrow p\bar{p}$ is studied considering a possible interference between resonant and continuum amplitudes. The cross section of $e^+e^\rightarrow\psi(3770)\rightarrow p\bar{p}$, $\sigma(e^+e^\rightarrow\psi(3770)\rightarrow p\bar{p})$, is found to have two solutions, determined to be ($0.059\pm0.032\pm0.012$) pb with the phase angle $\phi = (255.8\pm37.9\pm4.8)^\circ$ ($<$0.11 pb at the 90% confidence level), or $\sigma(e^+e^\rightarrow\psi(3770)\rightarrow p\bar{p}) = (2.57\pm0.12\pm0.12$) pb with $\phi = (266.9\pm6.1\pm0.9)^\circ$ both of which agree with a destructive interference. Using the obtained cross section of $\psi(3770)\rightarrow p\bar{p}$, the cross section of $p\bar{p}\rightarrow \psi(3770)$, which is useful information for the future PANDA experiment, is estimated to be either ($9.8\pm5.7$) nb ($<17.2$ nb at 90% C.L.) or $(425.6\pm42.9)$ nb.03/2014;
Publication Stats
5k  Citations  
1,026.35  Total Impact Points  
Top Journals
Institutions

2012

China Agricultural University
 National Key Laboratory of Animal Nutrition
Peping, Beijing, China 
Yantai University
Chifu, Shandong Sheng, China


1983–2012

Northwestern University
 • Department of Preventive Medicine
 • Department of Medicine
 • Center for Community Health
Evanston, Illinois, United States


2011

Peking University
Peping, Beijing, China 
Capital Medical University
Peping, Beijing, China 
Institute of physics china
Peping, Beijing, China


2010

Government of the People's Republic of China
Peping, Beijing, China 
Chinese Academy of Sciences
 Institute of Genetics and Developmental Biology
Peping, Beijing, China


2001

Columbia University
 JP Sulzberger Columbia Genome Center
New York City, NY, United States


2000

National Human Genome Research Institute
Maryland, United States


1995–1996

University of Minnesota Twin Cities
 School of Public Health
Minneapolis, MN, United States


1994

University of Illinois at Chicago
Chicago, Illinois, United States


1992

University of Utah
 Department of Family and Preventive Medicine
Salt Lake City, UT, United States
