X. H. Zhao's research while affiliated with Chinese Academy of Sciences and other places
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Publications (125)
We present the measurements of all-particle energy spectrum and mean logarithmic mass of cosmic rays in the energy range of 0.3–30 PeV using data collected from LHAASO-KM2A between September 2021 and December 2022, which is based on a nearly composition-independent energy reconstruction method, achieving unprecedented accuracy. Our analysis reveals...
Gamma-ray bursts (GRBs) have been phenomenologically classified into long and short populations based on the observed bimodal distribution of duration1. Multi-wavelength and multi-messenger observations in recent years have revealed that in general long GRBs originate from massive star core collapse events2, whereas short GRBs originate from binary...
Gamma-ray bursts (GRBs) have been phenomenologically classified into long and short populations based on the observed bimodal distribution of duration. Multi-wavelength and multi-messenger observations in recent years have revealed that in general long GRBs originate from massive star core collapse events, whereas short GRBs originate from binary n...
The afterglow of GRB 170817A has been detected for more than three years, but the origin of the multi-band afterglow light curves remains under debate. A classical top-hat jet model is faced with difficulties in producing a shallow rise of the afterglow light curves as observed $(F_{\nu} \propto T^{0.8})$. Here we reconsider the model of stratified...
Polarization can serve as a probe of the radiation mechanism and magnetic field (MF) configuration in gamma-ray bursts (GRBs). In the case of constant MF, the synchrotron polarization in the prompt phase of GRBs has been widely studied. In this paper, we consider the case of the decaying MF. We calculate the time-averaged and instantaneous synchrot...
Polarization can serve as a probe of the radiation mechanism and magnetic field (MF) configuration in gamma-ray bursts (GRBs). In the case of constant MF, the synchrotron polarization in the prompt phase of GRBs has been widely studied. In this paper, we consider the case of the decaying MF. We calculate the time-averaged and instantaneous synchrot...
Multi-VO supports based on DIRAC have been set up to provide workload and data management for several high energy experiments in IHEP. To monitor and manage the heterogeneous resources which belong to different Virtual Organizations in a uniform way, a resources monitoring and automatic management system based on Resource Status System(RSS) of DIRA...
Distributed computing is necessary nowadays for high energy physics experiments to organize heterogeneous computing resources all over the world to process enormous amounts of data. The BESIII experiment in China, has established its own distributed computing system, based on DIRAC, as a supplement to local clusters, collecting cluster, grid, deskt...
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Inspired by the success of BESDIRAC, the distributed computing environment based on DIRAC for BESIII experiment, several other experiments operated by Institute of High Energy Physics (IHEP), such as Circular Electron Positron Collider (CEPC), Jiangmen Underground Neutrino Observatory (JUNO), Large High Altitude Air Shower Observatory (LHAASO) and...
Using 2.92 fb$^{-1}$ of electron-positron annihilation data collected at a
center-of-mass energy of $\sqrt{s}= 3.773$ GeV with the BESIII detector, we
present an improved measurement of the branching fraction $\mathcal{B}(D^+ \to
\omega e^+ \nu_{e}) = (1.63\pm0.11\pm0.08)\times 10^{-3}$. The parameters
defining the corresponding hadronic form facto...
Using $2.92$ fb$^{-1}$ of electron-positron annihilation data collected at
$\sqrt{s} = 3.773$~GeV with the BESIII detector, we report the results of a
search for the flavor-changing neutral current process $D^0\to\gamma\gamma$
using a double-tag technique. We find no signal and set an upper limit at
$90\%$ confidence level for the branching fractio...
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},...
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 cro...
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...
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 detec...
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...
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 $(12.7\pm1.3\pm0.7)\times10^{-2}$. $\math...
We study the process e+e-→(D*D¯*)±π∓ at a center-of-mass energy of 4.26 GeV using a 827 pb-1 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...
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.})\p...
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 obser...
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 $\psi(3770)$ line-shape 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 cro...
With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e+e-→γX(3872) is observed for the first time with a statistical significance of 6.3σ. The measured mass of the X(3872) is (3871.9±0.7stat±0.2syst) MeV/c2, in agreement with previous measurements....
A search for the rare decays of $J/\psi \to D_s^-\rho^+ + c.c.$ and $J/\psi
\to \overline{D}{}^0\overline{K}{}^{\ast0} + c.c.$ is performed with a data
sample of 225.3 million $J/\psi$ events collected with the BESIII detector. No
evident signal is observed. Upper limits on the branching fractions are
determined to be $\mathcal{B}(J/\psi \to D_s^-\...
Using $(106.41\pm 0.86) \times 10^{6}$ $\psi(3686)$ events collected with the
BESIII detector at BEPCII, we study for the first time the decay
$\chi_{cJ}\to\eta'K^+K^-$, where $\eta'\to\gamma\rho^{0}$ and
$\eta'\to\eta\pi^+\pi^-$. A partial wave analysis in the covariant tensor
amplitude formalism is performed for the decay $\chi_{c1}\to\eta'K^+K^-...
We report on a study of the process e^{+}e^{-}→π^{±}(DD[over ¯]^{*})^{∓} at sqrt[s]=4.26 GeV using a 525 pb^{-1} data sample collected with the BESIII detector at the BEPCII storage ring. A distinct charged structure is observed in the (DD[over ¯]^{*})^{∓} invariant mass distribution. When fitted to a mass-dependent-width Breit-Wigner line shape, t...
We study e^{+}e^{-}→π^{+}π^{-}h_{c} at center-of-mass energies from 3.90 to 4.42 GeV by using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross sections are measured at 13 energies and are found to be of the same order of magnitude as those of e^{+}e^{-}→π^{+}π^{-}J/ψ but with a diff...
We report a measurement of the branching fraction $B(D^+ \rightarrow \mu^+
\nu_{\mu}) = [3.71 \pm 0.19 (\rm stat) \pm 0.06 (\rm sys)]\times 10^{-4}$ based
on 2.92 ${\rm fb^{-1}}$ of data accumulated at $\sqrt{s}=3.773$ GeV with the
BESIII detector at the BEPCII collider. This measurement, in conjunction with
the CKM matrix element $|V_{\rm cd}|$ de...
Data sets were collected with the BESIII detector at the BEPCII collider at the center-of-mass energy of √s = 3.650 GeV during May 2009 and at √s = 3.773 GeV from January 2010 to May 2011. By analyzing the large angle Bhabha scattering events, the integrated luminosities of the two data sets are measured to be (44.49±0.02±0.44) pb−1 and (2916.94±0....
Using a sample of $1.06\times10^{8} \psi(3686)$ events collected with the
BESIII detector at BEPCII, the decays $\eta_{c}(2S)\to p\bar{p}$ and $h_{c}\to
p\bar{p}$ are searched for, where $\eta_c(2S)$ and $h_c$ are reconstructed in
the decay chains $\psi(3686)\to\gamma\eta_{c}(2S)$, $\eta_{c}(2S)\to p\bar{p}$
and $\psi(3686)\to\pi^{0}h_{c}$, $h_{c}\...
Using a sample of $1.06\times10^{8}$ $\psi(3686)$ events collected with the
BESIII detector, we present the first observation of the decays of $\psi(3686)$
$\rightarrow$ $\Lambda\bar\Sigma^{+}\pi^{-}+c.c.$ and $\psi(3686)$
$\rightarrow$ $\Lambda\bar\Sigma^{-}\pi^{+}+c.c.$. The branching fractions are
measured to be $\mathcal{B}(\psi(3686) \rightarr...
![FIG. 4: The fit to σ B [e + e − → γX(3872)] × B[X(3872) → π + π − J/ψ]...](profile/Olga-Bondarenko-3/publication/257812032/figure/fig1/AS:613864450318354@1523368098606/The-fit-to-s-B-e-e-gX3872-BX3872-p-p-J-ps-with-a-Y-4260-resonance_Q320.jpg)
Using data samples collected with the BESIII detector operating at the BEPCII
storage ring at center-of-mass energies from 4.009 to 4.420 GeV, $e^{+} e^{-}
\to \gamma X(3872)$ is observed for the first time with a statistical
significance of $6.3\sigma$. The measured mass of X(3872) is ($3871.9\pm
0.7_{\rm stat.}\pm 0.2_{\rm sys.}$) MeV/c$^2$, in a...
In the internal shock model for gamma-ray bursts (GRBs), the synchrotron
spectrum from the fast cooling electrons in a homogeneous downstream magnetic
field (MF) is too soft to produce the low-energy slope of GRB spectra. However
the magnetic field may decay downstream with distance from the shock front.
Here we show that the synchrotron spectrum b...
We study e+e- --> pi+pi-h_c at center-of-mass energies from 3.90 GeV to 4.42
GeV using data samples collected with the BESIII detector operating at the
Beijing Electron Positron Collider. The Born cross sections are measured at 13
energies, and are found to be of the same order of magnitude as those of e+e-
--> pi+pi-J/psi but with a different line...
We study the process $e^+e^- \to (D^{*} \bar{D}^{*})^{\pm} \pi^\mp$ at a
center-of-mass energy of 4.26\,GeV using a 827\,pb$^{-1}$ 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
$(137\pm9\pm15)$\,pb. We observe a structure...
We present multiwavelength observations of the afterglow of GRB 130427A, the
brightest (in total fluence) gamma-ray burst of the past 29 years. Optical
spectroscopy from Gemini-North reveals the redshift of the GRB to be z=0.340,
indicating that its unprecedented brightness is primarily the result of its
relatively close proximity to Earth; the int...
![FIG. 6. Comparison of B[ψ(3686) → π + π − J/ψ] among different experiments.](profile/B-Zou-2/publication/245025580/figure/fig4/AS:668757651374082@1536455657232/Comparison-of-Bps3686-p-p-J-ps-among-different-experiments_Q320.jpg)
Based on $(106.41 \pm 0.86)\times 10^{6}$ $\psi(3686)$ events collected with
the BESIII detector at the BEPCII collider, the branching fractions of
$\psi(3686) \to \pi^+\pi^- J/\psi$, $J/\psi \to e^+e^- $, and $J/\psi \to
\mu^+\mu^-$ are measured. We obtain ${\cal B}[\psi(3686) \to
\pi^+\pi^-J/\psi]=(34.98\pm 0.02\pm 0.45)%$, ${\cal B}[J/\psi \to e...
We study the process e^{+}e^{-}→π^{+}π^{-}J/ψ at a center-of-mass energy of 4.260 GeV using a 525 pb^{-1} data sample collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross section is measured to be (62.9±1.9±3.7) pb, consistent with the production of the Y(4260). We observe a structure at around 3.9...
With a sample of 225.3 million $J/\psi$ events taken with the BESIII
detector, the decay $J/\psi\rightarrow \gamma 3(\pi^+\pi^-)$ is analyzed. A
structure at 1.84 GeV/c$^2$ is observed in the $3(\pi^+\pi^-)$ invariant mass
spectrum with a statistical significance of 7.6$\sigma$ . The mass and width
are measured to be $M=1842.2\pm 4.2^{+7.1}_{-2.6}$...
By analyzing data samples of 2.9 fb^{-1} collected at \sqrt s=3.773 GeV, 482
pb^{-1} collected at \sqrt s=4.009 GeV and 67 pb^{-1} collected at \sqrt
s=3.542, 3.554, 3.561, 3.600 and 3.650 GeV with the BESIII detector at the
BEPCII storage ring, we search for \psi(3770) and \psi(4040) decay to baryonic
final states, including \Lambda\bar\Lambda\pi^...
We search for the lepton-flavor-violating decay of the $J/\psi$ into an
electron and a muon using $(225.3\pm2.8)\times 10^{6}$ $J/\psi$ events
collected with the BESIII detector at the BEPCII collider. Four candidate
events are found in the signal region, consistent with background expectations.
An upper limit on the branching fraction of $\mathcal...
Using a sample of $1.06 \times 10^{8}$ $\psi(2S)$ events collected with the
BESIII detector at BEPCII, the decay $\psi(2S) \to p \bar{p}\eta$ is studied. A
partial wave analysis determines that the intermediate state N(1535) with a
mass of $1524\pm5^{+10}_{-4}$ MeV/$c^2$ and a width of $130^{+27+57}_{-24-10}$
MeV/$c^2$ is dominant in the decay; the...
Based on a sample of 225.3 million J/\psi events accumulated with the BESIII
detector at the BEPCII, the decays of \eta' to pi+pi-l+l- are studied via
J/\psi to \gamma\eta'. A clear \eta' signal is observed in the pi+pi-e+e- mass
spectrum, and the branching fraction is measured to be \BR(\eta' to pi+pi-e+e-)
= (2.11\pm0.12 (stat.)\pm0.15 (syst.))\t...
We study the process e+e- to pi+pi-J/psi at a center-of-mass energy of 4.260
GeV using a 525 pb^{-1} data sample collected with the BESIII detector
operating at the Beijing Electron Positron Collider. The Born cross section is
measured to be (62.9\pm 1.9\pm 3.7) pb, consistent with the production of the
Y(4260). We observe a structure at around 3.9...
The decay $J/\psi \rightarrow \omega p \bar{p}$ has been studied, using
$225.3\times 10^{6}$ $J/\psi$ events accumulated at BESIII. No significant
enhancement near the $p\bar{p}$ invariant-mass threshold (denoted as
$X(p\bar{p})$) is observed. The upper limit of the branching fraction
$\mathcal{B}(J/\psi \rightarrow \omega X(p\bar{p}) \rightarrow \...
We search for the M1 radiative transition psi(3686) -> gamma eta(c)(2S) by reconstructing the exclusive eta(c)(2S) -> (KSK +/-)-K-0 pi(-/+)pi(+)pi(-) decay using 1.06 X 10(8) psi(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the eta...
Based on 106×10^{6}ψ(3686) events collected with the BESIII detector at the BEPCII facility, a partial wave analysis of ψ(3686)→pp[over ¯]π^{0} is performed. The branching fraction of this channel has been determined to be B(ψ(3686)→pp[over ¯]π^{0})=(1.65±0.03±0.15)×10^{-4}. In this decay, 7 N^{*} intermediate resonances are observed. Among these,...
![Fig 1 [16].](profile/Olga-Bondarenko-3/publication/234066537/figure/fig1/AS:650467226947591@1532094880765/16_Q320.jpg)
We search for the M1 radiative transition \psi(3686) \to \gamma\eta_{c}(2S)
by reconstructing the exclusive \eta_{c}(2S) \to
K_{S}^{0}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-} decay using 1.06 \times 10^8 \psi(3686)
events collected with the BESIII detector. The signal is observed with a
statistical significance of greater than 4 standard deviations. The meas...
Gamma-ray burst (GRB) light curves generally are energy dependent, i.e., the higher the photon energy, the narrower the pulse. In addition, the peak of the pulse at lower energies is usually delayed compared with that in higher energy. The phenomenon even exists in some X-ray flares and following optical flares. However, its origin is still unclear...
Based on a sample of $2.25\times 10^{8}$ $J/\psi$ events collected with the
BESIII detector at BEPCII, a full partial wave analysis on
$J/\psi\to\gamma\eta\eta$ was performed using the relativistic covariant tensor
amplitude method. The results show that the dominant $0^{++}$ and $2^{++}$
components are from the $f_0(1710)$, $f_0(2100)$, $f_0(1500)...
Using a sample of 225.3 million $\jpsi$ events collected with the BESIII
detector at the BEPCII $e^+e^-$ collider in 2009, searches for the decays of
$\eta$ and $\eta^\prime\to\pi^+ e^- \bar{\nu}_e +c.c.$ in $\jpsi \to \phi \eta$
and $\phi\eta^\prime$ are performed. The $\phi$ signals, which are
reconstructed in $K^+K^-$ final states, are used to t...
The two-photon transition ψ(3686)→γγJ/ψ is studied in a sample of 1.06×10^{8} ψ(3686) decays collected by the BESIII detector. The branching fraction is measured to be (3.1±0.6(stat)_{-1.0}^{+0.8}(syst))×10^{-4} using J/ψ→e^{+}e^{-} and J/ψ→μ^{+}μ^{-} decays, and its upper limit is estimated to be 4.5×10^{-4} at the 90% confidence level. This work...
We present a precision study of the $\psip\to\pi^0 J/\psi$ and $\eta J/\psi$
decay modes. The measurements are obtained using $106\times10^6$ $\psi'$ events
accumulated with the BESIII detector at the BEPCII $\ee$ collider operating at
a center-of-mass energy corresponding to the $\psip$ mass. We obtain
$\mathcal{B}(\psip\to\pi^0 J/\psi)=(1.26\pm0....
Using a data sample of $2.25\times10^{8}$ $J/\psi$ events collected with the
BESIII detector, we present the first observation of the decays of $\eta_{c}$
mesons to $\Sigma^{+}\bar{\Sigma}^{-}$ and $\Xi^{-}\bar{\Xi}^{+}$. The
branching fractions are measured to be $(2.11\pm0.28_{\rm stat.}\pm0.18_{\rm
syst.}\pm0.50_{\rm PDG})\times10^{-3}$ and $(0....
The number of J/ψ events collected with the BESIII detector at the BEPCII from June 12 to July 28, 2009 is determined to be (225.3±2.8) × 106 using J/ψ →inclusive events, where the uncertainty is the systematic error and the statistical one is negligible.
Using a sample of 106×10(6) ψ(3686) events collected with the BESIII detector at the BEPCII storage ring, we have made the first measurement of the M1 transition between the radially excited charmonium S-wave spin-triplet and the radially excited S-wave spin-singlet states: ψ(3686)→γη(c)(2S). Analyses of the processes ψ(3686)→γη(c)(2S) with η(c)(2S...
The mass and width of the lowest-lying S-wave spin singlet charmonium state, the η(c), are measured using a data sample of 1.06×10(8) ψ(3686) decays collected with the BESIII detector at the BEPCII storage ring. We use a model that incorporates full interference between the signal reaction, ψ(3686)→γη(c), and a nonresonant radiative background to d...
The process $\psi(3686) \to \pi^0 h_c, h_c \to \gamma \eta_c$ has been
studied with a data sample of $106 \pm 4$ million $\psi(3686)$ events collected
with the BESIII detector at the BEPCII storage ring. The mass and width of the
$P$-wave charmonium spin-singlet state $h_c(^1P_1)$ are determined by
simultaneously fitting distributions of the $\pi^0...
Decays of the chi(cJ) states (J = 0, 1, 2) to Lambda(Lambda) over bar pi(+)pi(-), including processes with intermediate Sigma(1385), are studied through the E1 transition psi(1) -> gamma chi(cJ) using 106 x 10(6) psi(1) events collected with the BESIII detector at BEPCII. This is the first observation of chi(cJ) decays to the final state Lambda(Lam...
Decays of the χcJ states (J=0, 1, 2) to ΛΛ̅ π+π-, including processes with intermediate Σ(1385), are studied through the E1 transition ψ′→γχcJ using 106×106 ψ′ events collected with the BESIII detector at BEPCII. This is the first observation of χcJ decays to the final state ΛΛ̅ π+π-. The branching ratio of the intermediate process χcJ→Σ(1385)±Σ̅ (...
Using a sample of $(225.3\pm 2.8)\times 10^{6}$ $J/\psi$ decays collected
with the BESIII detector at BEPCII, searches for invisible decays of $\eta$ and
$\eta^\prime$ in $J/\psi\to\phi\eta$ and $\phi\eta^\prime$ are performed.
Decays of $\phi \to K^{+}K^{-}$ are used to tag the $\eta$ and $\eta^\prime$
decays. No signals above background are found...
The decays J/ψ→pp̅ and J/ψ→nn̅ have been investigated with a sample of 225.2×106 J/ψ events collected with the BESIII detector at the BEPCII e+e- collider. The branching fractions are determined to be B(J/ψ→pp̅ )=(2.112±0.004±0.031)×10-3 and B(J/ψ→nn̅ )=(2.07±0.01±0.17)×10-3. Distributions of the angle θ between the proton or antineutron and the be...
Hadronic transitions of $\chi_{cJ}\to \eta_{c}\pi^{+}\pi^{-}$ (J=0, 1, 2) are
searched for using a sample of $1.06\times 10^{8}$ $\psi(3686)$ events
collected with the BESIII detector at the BEPCII storage ring. The $\etac$ is
reconstructed with $K_{S}^{0}K^{+}\pi^{-}+c.c.$ and $K^{+}K^{-}\pi^{0}$ final
states. No signals are observed in any of the...
Using a data sample of $1.06 \times 10^{8}$ $\psip$ events collected with the
BESIII detector in 2009, the branching fractions of $\chi_{cJ}\to
p\bar{n}\pi^{-}$ and $\chi_{cJ}\to p\bar{n}\pi^{-}\pi^{0}$ ($J$=0,1,2) are
measured{Throughout the text, inclusion of charge conjugate modes is implied if
not stated otherwise.}. The results for $\chi_{c0}\...
Using $(106\pm4)\times 10^6$ $\psip$ events accumulated with the BESIII
detector at the BEPCII $e^+e^-$ collider, we present measurements of the
branching fractions for psi' decays to $K^{+}K^{-}\pi^{0}$ and
$K^{+}K^{-}\eta$. In these final states, the decay $\psi'\to
K_2^{*}(1430)^+K^-+c.c.$ is observed for the first time, and its branching
fracti...
Using a 478 pb$^{-1}$ data sample collected with the BESIII detector
operating at the BEPCII storage ring at a center-of-mass energy of
$\sqrt{s}=4.009$ GeV, the production of $e^{+}e^{-}\to \eta J\psi$ is observed
for the first time with a statistical significance of greater than $10\sigma$.
The Born cross section is measured to be $(32.1\pm 2.8 \...
The decay of $J/\psi$ to three photons is studied using
$\psi(3686)\to\pi^+\pi^-J/\psi$ in a sample of $1.0641\times10^8$ $\psi(3686)$
events collected with the BESIII detector. Evidence of the direct decay of
$\eta_c$ to two photons, $\eta_c\to\gamma\gamma$, is reported, and the product
branching fraction is determined to be
$\mathcal{B}(J/\psi\to...
Decays of the chi_{cJ} states (J=0,\ 1,\ 2) to \Lambda \Lambda bar\ pi^{+}
\pi^{-}, including processes with intermediate \Sigma(1385), are studied
through the E1 transition psi'-->\gamma chi_{cJ} using 106 million psi' events
collected with the BESIII detector at BEPCII. This is the first observation of
chi_{cJ} decays to the final state \Lambda\L...
Using a sample of $(225.2\pm 2.8)\times 10^6$ $J/\psi$ events collected with
the BESIII detector, we present results of a study of $J/\psi\rightarrow
\gamma\Lambda\bar{\Lambda}$ and report the first observation of the isospin
violating decay $J/\psi\rightarrow\Lambda\bar{\Sigma}^{0}+c.c.$, in which
$\bar{\Sigma}^{0}$ decays to $\gamma \bar{\Lambda}...
Based on a data sample of 106×106 ψ′ events collected with the BESIII detector, the decays ψ′→γχc0,2, χc0,2→γγ are studied to determine the two-photon widths of the χc0,2 states. The two-photon decay branching fractions are determined to be B(χc0→γγ)=(2.24±0.19±0.12±0.08)×10-4 and B(χc2→γγ)=(3.21±0.18±0.17±0.13)×10-4. From these, the two-photon wid...
Using a sample of 106 million \psi(3686) events collected with the BESIII
detector at the BEPCII storage ring, we have made the first measurement of the
M1 transition between the radially excited charmonium S-wave spin-triplet and
the radially excited S-wave spin-singlet states: \psi(3686)\to\gamma\eta_c(2S).
Analyses of the processes \psi(2S)\to \...
Based on a data sample of 106 M $\psi^{\prime}$ events collected with the
BESIII detector, the decays $\psi^{\prime}\ar\gamma\chi_{c0, 2}$,$\chi_{c0,
2}\ar\gamma\gamma$ are studied to determine the two-photon widths of the
$\chi_{c0, 2}$ states. The two-photon decay branching fractions are determined
to be ${\cal B}(\chi_{c0}\ar\gamma\gamma) = (2.2...
Using a data sample containing 1.06×108 ψ′ events collected with the BESIII detector at the BEPCII electron-positron collider, we search for a light exotic particle X in the process ψ′→π+π-J/ψ, J/ψ→γX, X→μ+μ-. This light particle X could be a Higgs-like boson A0, a spin-1 U boson, or a pseudoscalar sgoldstino particle. In this analysis, we find no...
![FIG. 12. Fit to the angle between the n and ¯ n for cos θ in [-0.3,-0.2].](profile/Herbert-Loehner/publication/224905417/figure/fig4/AS:393736484868098@1470885501046/Fit-to-the-angle-between-the-n-and-n-for-cos-th-in-03-02_Q320.jpg)
The decays $J/\psi\to p\bar{p}$ and $J/\psi\to n\bar{n}$ have been
investigated with a sample of 225.2 million $J/\psi$ events collected with the
BESIII detector at the BEPCII $e^+e^-$ collider. The branching fractions are
determined to be $\mathcal{B}(J/\psi\to
p\bar{p})=(2.112\pm0.004\pm0.031)\times10^{-3}$ and $\mathcal{B}(J/\psi\to
n\bar{n})=(2...
The decays J/ψ → γ π+ π- π0 and J/ψ → γ π0 π0 π0 are analyzed using a sample of 225×10(6) J/ψ events collected with the BESIII detector. The decay of η(1405) → f(0)(980)π0 with a large isospin violation is observed for the first time. The width of the f(0)(980) observed in the dipion mass spectra is anomalously narrower than the world average. Deca...
Previous studies have found that the width of gamma-ray burst (GRB) pulse is
energy dependent and that it decreases as a power-law function with increasing
photon energy. In this work we have investigated the relation between the
energy dependence of pulse and the so-called Band spectrum by using a sample
including 51 well-separated fast rise and e...
The two-photon transition $\psi(3686)\to\gamma\gamma J/\psi$ is studied in a
sample of 106 million $\psi(3686)$ decays collected by the BESIII detector. The
branching fraction is measured to be
$(3.1\pm0.6(\unit{stat})^{+0.8}_{-1.0}(\unit{syst})) \times10^{-4}$ using
$J/\psi\to e^+e^-$ and $J/\psi\to\mu^+\mu^-$ decays, and its upper limit is
estima...
A partial wave analysis of the pp¯ mass-threshold enhancement in the reaction J/ψ→γpp¯ is used to determine its J(PC) quantum numbers to be 0(-+), its peak mass to be below threshold at M=1832(-5)(+19)(stat)(-17)(+18)(syst)±19(model) MeV/c(2), and its total width to be Γ<76 MeV/c(2) at the 90% C.L. The product of branching ratios is measured to be...
We study the decays of the J/psi and psi' mesons to pi+pi-pi0 using data
samples at both resonances collected with the BES III detector in 2009. We
measure the corresponding branching fractions with unprecedented precision and
provide mass spectra and Dalitz plots. The branching fraction for J/psi ->
pi+pi-pi0 is determined to be (2.137 +- 0.004 (s...
The decays $J/\psi \rightarrow \gamma \pi^+\pi^-\pi^0$ and $J/\psi
\rightarrow \gamma \pi^0\pi^0\pi^0$ are analyzed using a sample of 225 million
$\jpsi$ events collected with the BESIII detector. The decay of $\eta(1405)\ar
f_{0}(980)\pi^0$ with a large isospin violation is observed for the first time.
The width of the $f_{0}(980)$ observed in the...
Using 106×106 ψ′ events collected with the BESIII detector at the BEPCII storage ring, the higher-order multipole amplitudes in the radiative transition ψ′→γχc2→γπ+π-/γK+K- are measured. A fit to the χc2 production and decay angular distributions yields M2=0.046±0.010±0.013 and E3=0.015±0.008±0.018, where the first errors are statistical and the se...
The mass and width of the lowest lying S-wave spin singlet charmonium state,
the eta_c, are measured using a data sample of 1.06x10^8 psi' decays collected
with the BESIII detector at the BEPCII storage ring. We use a model that
incorporates interference between the signal reaction, psi' -> gamma eta_c, and
a non-resonant radiative background to su...
We present results of a study of the decay J/ψ → ωηπ+ π- using a sample of (225.2 ± 2.8) × 10(6) J/ψ events collected by the BESIII detector, and report the observation of a new process J/ψ → ωX(1870) with a statistical significance of 7.2σ, in which X(1870) decays to a(0)(±)(980)π±. Fitting to ηπ+ π- mass spectrum yields a mass M = 1877.3 ± 6.3(st...
The processes eta'(c) -> rho(0)rho(0), K*0K*0, and phi phi are searched for using a sample of 1.06 x 10(8) psi' events collected with the BESIII detector at the BEPCII collider. No signals are observed in any of the three final states. The upper limits on the decay branching fractions are determined to be B(eta'(c) -> rho(0)rho (0)) < 3.1 x 10(-3),...
- [...]
Using (106±4)×10⁻⁶ ψ(3686) events accumulated with the BESIII detector at the BEPCII e⁺e⁻ collider, we present the first measurement of decays of χ(c1) to vector meson pairs φφ, ωω, and ωφ. The branching fractions are measured to be (4.4±0.3±0.5)×10⁻⁴, (6.0±0.3±0.7)×10⁻⁴, and (2.2±0.6±0.2)×10⁻⁵, for χ(c1)→φφ, ωω, and ωφ, respectively, which indicat...
Using (106±4)×106 ψ(3686) events accumulated with the BESIII detector at the BEPCII e+e- collider, we present the first measurement of decays of χc1 to vector meson pairs ÏÏ, ωω, and ωÏ. The branching fractions are measured to be (4.4±0.3±0.5)×10-4, (6.0±0.3±0.7)×10-4, and (2.2±0.6±0. 2)×10-5, for χc1→Ï Ï, ωω, and ωÏ, respectively, which indicates...
First measurements of the decays of the three χcJ states to pp̅ K+K- final states are presented. Intermediate ϕ→K+K- and Λ(1520)→pK- resonance states are observed, and branching fractions for χcJ→p̅ K+Λ(1520), Λ(1520)Λ̅ (1520), and ϕpp̅ are reported. We also measure branching fractions for direct χcJ→pp̅ K+K- decays. These are first observations of...
The decays χcJ→γV (V=ϕ, ρ0, ω) are studied with a sample of radiative ψ′→γχcJ events in a sample of (1.06±0.04)×108ψ′ events collected with the BESIII detector. The branching fractions are determined to be: B(χc1→γϕ)=(25.8±5.2±2.3)×10-6, B(χc1→γρ0)=(228±13±22)×10-6, and B(χc1→γω)=(69.7±7.2±6.6)×10-6. The decay χc1→γϕ is observed for the first time....
Citations
... However, the traditional classification schemes have been challenged by recent observations, the dichotomy based on phenomenon does not necessarily correspond to the two distinct physical origins of GRBs. Some short-duration GRBs (such as GRB 090426, GRB 100816A, and GRB 200826A) are thought to possibly originate from massive collapsars (Zhang et al. 2009;Fan & Wei 2011;Nicuesa Guelbenzu et ⋆ Contact e-mail: fwzhang@pmo.ac.cn al. 2011; Xin et al. 2011;Zhang et al. 2012;Ahumada et al. 2021;Zhang et al. 2021;Rossi et al. 2022), while some longduration GRBs (such as GRB 060505, GRB 060614, 211227A, and GRB 211211A) are believed to possibly originate from compact binary mergers (Della Valle et al. 2006;Gal-Yam et al. 2006;Gehrels et al. 2006;Fynbo et al. 2006;Zhang et al. 2007;Lü et al. 2022;Rastinejad et al. 2022;Troja et al. 2022;Xiao et al. 2022;Yang et al. 2022;Zhu et al. 2022). Moreover, a significant overlapping is presented in the T90 distribution of SGRBs and LGRBs, and the measurement of T90 strongly depends on instrument and energy band (Zhang et al. 2012;. ...
... Different magnetic field geometries have been considered, including ordered magnetic fields (e.g. Granot 2003 ;Granot & K önigl 2003 ;Lyutiko v, P ariev & Blandford 2003 ;Nakar, Piran & Waxman 2003 ;Mundell et al. 2013 ;Cheng, Zhao & Bai 2020 ;Teboul & Shaviv 2021 ;Kuwata et al. 2023 ), magnetic fields tangled in the shock plane or perpendicular to it (Ghisellini & Lazzati 1999 ;Gruzinov 1999 ;Medvedev & Loeb 1999 ;Sari, Piran & Halpern 1999 ;Granot et al. 2002 ), or asymmetric magnetic fields, e.g. those generated by causally disconnected regions (e.g. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/11431281203280984-1699277728703_Q64/Kai-Fang-Cheng-2.jpg)
... It is in order of 1 PB of data collected per year now and the data volume is continuously growing. The lack of computing resources in IHEP became the reason to build a distributed computing infrastructure using the resources of institutes working within the BES-III collaboration [4]. ...
Reference: BES-III distributed computing status
![[object Object]](https://i1.rgstatic.net/ii/profile.image/1112444189577217-1642238771767_Q64/Huaxuan-Cai.jpg)
... Multi-VO supports based on DIRAC have been set up to provide workload and data management for several high energy experiments in IHEP [2]. Many heterogeneous sites have been plugged in the distributed computing system in a similar way by DIRAC acting as an abstraction layer. ...
... The special cases are those of η and η decays, which only involve the pseudoscalar nonet. In the case of the η c , the large decay width 32.0(7) MeV presents certain challenges for amplitude analyses: depending on the decay mode there may be significant contributions from interference with the nonresonant J/ψ → γX decays to the identical final states [530][531][532]. Therefore a viable alternative, where the η c is produced in two-photon processes, is discussed in this section. ...
... In addition, the unexpected large production cross section for e + e − → π + π − h c in the BESIII energy region [27] opened a new mechanism for studying the h c and η c (from h c → γ η c ), and BESIII contributed the world's best measurements of the properties of these states [28]. We report here the observation of the M1 transition ψ(2S) → γ η c (2S) at BESIII [29], a transition that has been sought for since the first-generation BES experiment in the 1980s. Data (K + K π 0 ) Fitting results χ cJ η c (2S) Background Figure 1. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272582784057366-1442000208951_Q64/Fenfen-An.jpg)
... After a D − s candidate is identified, we reconstruct the decay D þ s → π þ π − e þ ν e recoiling against the tag side, requiring three charged tracks identified as a π þ π − pair with the same selection criteria as on the tag side and e þ (opposite sign to the tag D − s ) following Ref. [41]. Using the same kinematic fit method of Refs. ...
... It is desirable to extend these studies to decays of χ cJ into pairs of decuplet ground-state baryons with spin 3=2. So far only χ c0 → Σð1385Þ AEΣ ð1385Þ ∓ decays [12] have been studied by the BESIII Collaboration. The decay χ cJ → Ω −Ωþ is unique due to the presence of three pairs of strange quarks in the final state. ...
Reference: Observation of the decay χ c J → Ω − Ω ¯ +
... This experiment also studied whether the controversial D Ã s ð2710Þ was the first radial excitation of D Ã s ð2112Þ [30]. The BESIII detector at the BEPCII e þ e − collider provided precise mass determination of the η c ð1SÞ 1 meson [31]. The LHCb Collaboration [32] observed a state consistent with B Ã c ð1SÞ with a mass of 6841.2 ...
... However, BESIII reported similar branching fractions of χ cJ → φφ decays for χ c0 , χ c1 , and χ c2 , namely B(χ c0 → φφ) = (7.8 ± 0.4 ± 0.8) × 10 −4 , B(χ c1 → φφ) = (4.1 ± 0.3 ± 0.4) × 10 −4 , and B(χ c2 → φφ) = (10.7 ± 0.4 ± 1.1) × 10 −4 [8]. ...
Reference: Helicity amplitude analysis of χcJ → ϕϕ
