arXiv subjects

Y. Ding

Publications and source records attributed to Y. Ding.

At least 271 records · Page 15Linked to original sources

arXiv2024

Measurement of Born cross sections of $e^+e^-\toΞ^0\barΞ^0$ and search for charmonium(-like) states at $\sqrt{s}$ = 3.51-4.95 GeV

Using $e^+e^-$ collision data collected by the BESIII detector at BEPCII corresponding to an integrated luminosity of 30 $\rm fb^{-1}$, we measure Born cross sections and effective form factors for the process $e^+e^-\toΞ^0\barΞ^0$ at forty-five center-of-mass energies between 3.51 and 4.95 GeV. The dressed cross section is fitted, assuming a power-law function plus a charmonium(-like) state, i.e., $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, $ψ(4230)$, $ψ(4360)$, $ψ(4415)$ or $ψ(4660)$. No significant charmonium(-like) state decaying into $Ξ^0\barΞ^0$ is observed. Upper limits at the 90% confidence level on the product of the branching fraction and the electronic partial width are provided for each decay. In addition, ratios of the Born cross sections and the effective form factors for $e^+e^-\toΞ^0\barΞ^0$ and $e^+e^-\toΞ^-\barΞ^+$ are also presented to test isospin symmetry and the vector meson dominance model.

hep-ex↗

arXiv2024

Search for $η_c(2S)\to p\bar{p}$ and branching fraction measurements of $χ_{cJ} \to p\bar{p}$ via $ψ(2S)$ radiative decays

Using $(27.12\pm0.14) \times 10^{8}$ $ψ(2S)$ events collected by the BESIII detector operating at BEPCII, we search for the decay $η_c(2S)\to p\bar{p}$ via the process $ψ(2S)\to γη_c(2S)$, and only find a signal with a significance of $1.7\,σ$. The upper limit of the product branching fraction at the 90% confidence level is determined to be $\mathcal{B}(ψ(2S)\to γη_c(2S))\times \mathcal{B}(η_c(2S)\to p\bar{p})<2.4\times 10^{-7}$. The branching fractions of $χ_{cJ}\to p\bar{p}~(J=0,1,2)$ are also measured to be $\mathcal{B}(χ_{c0}\to p\bar{p})=(2.51\pm0.02\pm0.08)\times 10^{-4}$, $\mathcal{B}(χ_{c1}\to p\bar{p})=(8.16\pm0.09\pm0.25)\times 10^{-4}$, and $\mathcal{B}(χ_{c2}\to p\bar{p})=(8.33\pm0.09\pm0.22)\times 10^{-4}$, where the first uncertainty is statistical and the second systematic.

hep-ex↗

arXiv2024

Measurement of the branching fractions of the decays $Λ_{c}^{+}\rightarrowΛK_{S}^{0}K^{+}$, $Λ_{c}^{+}\rightarrowΛK_{S}^{0}π^{+}$ and $Λ_{c}^{+}\rightarrowΛK^{*+}$

Studies are performed of the Cabibbo-favored decay $Λ_{c}^{+}\toΛK_{S}^{0}K^+$ and the singly Cabibbo-suppressed decay $Λ_{c}^{+}\toΛK_{S}^{0}π^+$, based on a sample of $e^{+}e^{-}$ collision data, corresponding to an integrated luminosity of 4.5 fb$^{-1}$, accumulated at center-of-mass energies between $4599.53$ MeV and $4698.82$ MeV with the BESIII detector. The decay $Λ_{c}^{+}\toΛK_{S}^{0}π^+$ is observed for the first time. The branching fractions of $Λ_{c}^{+}\toΛK_{S}^{0}K^+$ and $Λ_{c}^{+}\toΛK_{S}^{0}π^+$ are measured to be $(3.04\pm0.30\pm0.16)\times 10^{-3}$ and $(1.73\pm0.27\pm0.10)\times 10^{-3}$, respectively, where the first uncertainties are statistical and the second are systematic. These results correspond to the most precise measurement of these quantities for both decays. Evidence of a $K^{*+}$ contribution in the $Λ_{c}^{+}\toΛK_{S}^{0}π^+$ decay is found with a statistical significance of $4.7σ$. The branching fraction of $Λ_{c}^{+}\toΛK^{*+}$ is calculated under three possible interference scenarios.

hep-ex↗

arXiv2024

Observation of $χ_{c0}\toΣ^{+}\barΣ^{-}η$ and evidence for $χ_{c1,2}\toΣ^{+}\barΣ^{-}η$

Using $(27.12\pm 0.14)\times10^{8}$ $ψ(3686)$ events collected with the BESIII detector, the decay $χ_{c0}\toΣ^{+}\barΣ^{-}η$ is observed for the first time with a statistical significance of $7.0σ$, and evidence for $χ_{c1}\toΣ^{+}\barΣ^{-}η$ and $χ_{c2}\toΣ^{+}\barΣ^{-}η$ is found with statistical significances of $4.3σ$ and $4.6σ$, respectively. The branching fractions are determined to be $\mathcal{B}(χ_{c0}\toΣ^{+}\barΣ^{-}η)=({1.26 \pm 0.20 \pm 0.13}) \times 10^{-4}, ~\mathcal{B}(χ_{c1}\toΣ^{+}\barΣ^{-}η)=({5.10 \pm 1.21 \pm 0.67}) \times 10^{-5}$, and $\mathcal{B}(χ_{c2}\toΣ^{+}\barΣ^{-}η)=({5.46 \pm 1.18 \pm 0.50}) \times 10^{-5}$, where the first uncertainties are statistical, and the second ones are systematic.

hep-ex↗

arXiv2024

Observation of the Singly Cabibbo-Suppressed Decay $Λ_c^{+}\to pπ^0$

Utilizing 4.5${~\rm{fb}}^{-1}$ of $e^+e^-$ annihilation data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 4.600 and 4.699 GeV, the first observation of the singly Cabibbo-suppressed decay $Λ_c^{+}\to pπ^0$ is presented, with a statistical significance of $5.4σ$. The ratio of the branching fractions of $Λ_c^{+}\to pπ^0$ and $Λ_c^{+}\to pη$ is measured as $\mathcal{B}(Λ_c^{+}\to pπ^0)/\mathcal{B}(Λ_c^{+}\to pη)=(0.120\pm0.026_{\rm stat.}\pm0.007_{\rm syst.})$. This result resolves the longstanding discrepancy between earlier experimental searches, providing both a decisive conclusion and valuable input for QCD-inspired theoretical models. A sophisticated deep learning approach using a Transformer-based architecture is employed to distinguish the signal from the prevalent hadronic backgrounds, complemented by thorough validation and systematic uncertainty quantification.

hep-ex↗

arXiv2024

Search for $η_c(2S)\to 2(π^+π^-)$ and improved measurement of $χ_{cJ}\to 2(π^+π^-)$

We search for the hadronic decay $η_c(2S)\to 2(π^+π^-)$ in the $ψ(3686)\toγη_c(2S)$ radiative decay using $(27.12\pm 0.14)\times 10^8$ $ψ(3686)$ events collected by the BESIII detector at the BEPCII collider. No significant signal is found, and the upper limit of $\mathcal{B}[ψ(3686)\toγη_c(2S)]\mathcal{B}[η_c(2S)\to 2(π^+π^-)]$ is determined to be $0.78\times 10^{-6}$ at the 90\% confidence level. Using $ψ(3686)\toγχ_{cJ}$ transitions, we also measure the branching fractions of $\mathcal{B}[χ_{cJ(J=0,1,2)}\to 2(π^+π^-)]$, which are $\mathcal{B}[χ_{c0}\to 2(π^+π^-)]=(2.127\pm 0.002~(\mathrm{stat.})\pm 0.101~(\mathrm{syst.}))$\%, $\mathcal{B}[χ_{c1}\to 2(π^+π^-)]=(0.685\pm 0.001~(\mathrm{stat.})\pm 0.031~\mathrm{syst.}))$\%, and $\mathcal{B}[χ_{c2}\to 2(π^+π^-)]=(1.153\pm 0.001~(\mathrm{stat.})\pm 0.063~(\mathrm{syst.}))$\%.

hep-ex↗

arXiv2024

Search for $e^{+}e^{-} \to ϕχ_{c0}$ and $ϕη_{c2}(1D)$ at center-of-mass energies from 4.47 to 4.95 GeV

Utilizing a data set of $6.7$ fb$^{-1}$ from electron-positron collisions recorded by the BESIII detector at the BEPCII storage ring, a search is conducted for the processes $e^{+}e^{-} \to ϕχ_{c0}$ and $ϕη_{c2}(1D)$ across center-of-mass energies from 4.47 to 4.95 GeV. In the absence of any significant signals, upper limits are set. These include limits on the Born cross sections for $e^{+}e^{-} \to ϕχ_{c0}$, as well as the product of the Born cross section for $e^{+}e^{-} \to ϕη_{c2}(1D)$ and a sum of five branching fractions. Furthermore, the product of the electronic width of $Y(4660)$ and the branching fraction of the $Y(4660) \to ϕχ_{c0}$, denoted as $Γ^{Y(4660)}_{e^{+}e^{-}} \mathcal{B}_{Y(4660) \to ϕχ_{c0}}$, is determined to be $< 0.40$ eV at the 90\% confidence level.

hep-ex↗

arXiv2024

Observation of $χ_{cJ}\to p \bar p K^0_S K^- π^+ + c.c.$

By analyzing $(27.12\pm0.14)\times10^8$ $ψ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays of $χ_{cJ} \to p \bar{p} K^0_S K^- π^+ +c.c.(J=0, 1, 2)$ are observed for the first time with statistical significances greater than $10σ$. The branching fractions of these decays are determined to be $\mathcal{B}(χ_{c0}\to p \bar p K^{0}_{S} K^- π^+ + c.c.)=(2.61\pm0.27\pm0.32)\times10^{-5},$ $\mathcal{B}(χ_{c1}\to p \bar p K^{0}_{S} K^- π^+ + c.c.)=(4.16\pm0.24\pm0.46)\times10^{-5},$ and $\mathcal{B}(χ_{c2}\to p \bar p K^{0}_{S} K^- π^+ + c.c.)=(5.63\pm0.28\pm0.46)\times10^{-5}$, respectively. The processes $χ_{c1,2} \to \bar{p} Λ(1520) K^0_S π^{+} + c.c.$ are also observed, with statistical significances of 5.7$σ$ and 7.0$σ$, respectively. Evidence for $χ_{c0} \to\bar{p} Λ(1520) K^0_S π^{+} + c.c.$ is found with statistical significances of 3.3$σ$ each. The corresponding branching fractions are determined to be $\mathcal{B}(χ_{c0}\to \bar{p} Λ(1520) K^0_S π^{+} + c.c.) =(1.61^{+0.68}_{-0.64}\pm0.23)\times10^{-5}$, $\mathcal{B}(χ_{c1}\to \bar{p} Λ(1520) K^0_S π^{+} + c.c.)=(4.06^{+0.80}_{-0.76}\pm0.52)\times10^{-5}$, and $\mathcal{B}(χ_{c2}\to \bar{p} Λ(1520) K^0_S π^{+} + c.c.)=(4.09^{+0.87}_{-0.84}\pm0.42)\times10^{-5}$. Here, the first uncertainties are statistical and the second ones are systematic.

hep-ex↗

arXiv2024

Search for the massless dark photon with $D^0\toωγ'$ and $D^0\toγγ'$

Using $7.9~\rm{fb^{-1}}$ of $e^+e^-$ collision data collected at $\sqrt{s}=3.773$ GeV with the BESIII detector at the BEPCII collider, we search for the massless dark photon with the flavor-changing neutral current processes $D^0\toωγ'$ and $D^0\toγγ'$ for the first time. No significant signals are observed, and the upper limits at the 90% confidence level on the massless dark photon branching fraction are set to be $1.1\times10^{-5}$ and $2.0\times10^{-6}$ for $D^0\toωγ'$ and $D^0\toγγ'$, respectively. These results provide the most stringent constraint on the new physics energy scale associated with $cuγ'$ coupling in the world, with the new physics energy scale related parameter $|\mathbb{C}|^2+|\mathbb{C}_5|^2<8.2\times10^{-17}~\rm{GeV}^{-2}$ at the 90% confidence level.

hep-ex↗

arXiv2024

MeerKAT Observations of Herschel Protocluster Candidates

High-redshift protoclusters consisting of dusty starbursts are thought to play an important role in galaxy evolution. Their dusty nature makes them bright in the FIR/submm but difficult to find in optical/NIR surveys. Radio observations are an excellent way to study these dusty starbursts, as dust is transparent in the radio and there is a tight correlation between the FIR and radio emission of a galaxy. Here, we present MeerKAT 1.28 GHz radio imaging of 3 Herschel candidate protoclusters, with a synthesised beam size of ~$7.5'' \times 6.6''$ and a central thermal noise down to $4.35~μ$Jy/beam. Our source counts are consistent with other radio counts with no evidence of overdensities. Around 95% of the Herschel sources have 1.28 GHz IDs. Using the Herschel 250 micron primary beam size as the searching radius, we find 54.2% Herschel sources have multiple 1.28 GHz IDs. Our average FIR-radio correlation coefficient $q_{250μm}$ is $2.33\pm 0.26$. Adding $q_{250μm}$ as a new constraint, the probability of finding chance-aligned sources is reduced by a factor of ~6, but with the risk of discarding true identifications of radio-loud/quiet sources. With accurate MeerKAT positions, we cross-match our Herschel sources to optical/NIR data followed by photometric redshift estimations. By removing $z<1$ sources, the density contrasts of two of the candidate protoclusters increase, suggestive of them being real protoclusters at $z>1$. There is also potentially a $0.9<z<1.2$ overdensity associated with one candidate protocluster. In summary, photometric redshifts from radio-optical cross-identifications have provided some tentative evidence of overdensities aligning with two of the candidate protoclusters.

astro-ph.GA↗

arXiv2024

Search for the radiative decays $D^+\toγρ^+$ and $D^+\toγK^{*+}$

We search for the radiative decays $D^{+} \to γρ^+$ and $D^{+} \to γK^{*+}$ using 20.3~fb$^{-1}$ of $e^+e^-$ annihilation data collected at the center-of-mass energy $\sqrt{s}=3.773$ GeV by the BESIII detector operating at the BEPCII collider. No significant signals are observed, and the upper limits on the branching fractions of $D^{+} \to γρ^+$ and $D^{+} \to γK^{*+}$ at 90\% confidence level are set to be $1.3\times10^{-5}$ and $1.8\times10^{-5}$, respectively.

hep-ex↗

arXiv2024

Observation of an axial-vector state in the study of $ψ(3686) \to ϕηη'$ decay

Using (2712.4 $\pm$ 14.3)$\times 10^{6}$ $ψ(3686)$ events collected with the BESIII detector at BEPCII, a partial wave analysis of the decay $ψ(3686) \to ϕηη' $ is performed with the covariant tensor approach. An axial-vector state with a mass near 2.3 $\rm GeV/c^2$ is observed for the first time. Its mass and width are measured to be 2316 $\pm 9_{\mathrm{stat}} \pm 30_{\mathrm{syst}}\,\rm MeV/c^2$ and 89 $\pm 15_{\mathrm{stat}} \pm 26_{\mathrm{syst}}\,\rm MeV$, respectively. The product branching fractions of $\mathcal{B}(ψ(3686) \to X(2300) η') \mathcal{B}(X(2300)\to ϕη)$ and $\mathcal{B}(ψ(3686) \to X(2300) η)\mathcal{B}(X(2300)\to ϕη')$ are determined to be (4.8 $\pm 1.3_{\mathrm{stat}} \pm 0.7_{\mathrm{syst}})\times 10^{-6}$ and (2.2 $\pm 0.7_{\mathrm{stat}} \pm 0.7_{\mathrm{syst}})\times 10^{-6}$, respectively. The branching fraction $\mathcal{B}(ψ(3686) \to ϕηη')$ is measured for the first time to be (3.14$\pm0.17_{\mathrm{stat}}\pm0.24_{\mathrm{syst}})\times10^{-5}$. The first uncertainties are statistical and the second are systematic.

hep-ex↗

arXiv2024

Search for $D^0\to K^-ηe^+ν_e$, $D^+\to K_S^0 ηe^+ν_e$ and $D^+\to ηηe^+ν_e$ decays

By analyzing $e^+e^-$ annihilation data corresponding to an integrated luminosity of 7.93 fb$^{-1}$, collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we search for the semileptonic decays $D^0\to K^-ηe^+ν_e$, $D^+\to K_S^0 ηe^+ν_e$ and $D^+\to ηηe^+ν_e$ for the first time. We present evidence for $D^0\to K^-ηe^+ν_e$ with a significance of $3.3σ$. The branching fraction of $D^0\to K^-ηe^+ν_e$ is measured to be $(0.84_{-0.34}^{+0.29}\pm0.22)\times 10^{-4}$. Here, the first uncertainties are statistical and the second ones are systematic. No significant signals are observed for the decays $D^+\to K_S^0 ηe^+ν_e$ and $D^+\to ηηe^+ν_e$ and we set the upper limits on their branching fractions.

hep-ex↗

arXiv2024

Search for $X(3872)\toπ^0π^0χ_{c1,2}$

Using 10.1 fb$^{-1}$ of $e^+e^-$ collision data collected by the BESIII detector with center-of-mass energies between 4.15 GeV and 4.30 GeV, we search for the decays $X(3872)\toπ^0π^0χ_{c1,2}$, where the $X(3872)$ is produced in $e^+e^-\toγX(3872)$. No evidence above $3σ$ is found for either decay. Upper limits at the $90\%$ C.L. on the branching fractions of $X(3872)\toπ^0π^0χ_{c1,2}$ normalized to the branching fraction of $X(3872)\toπ^+π^-J/ψ$ are set to be $\mathcal{B}(X(3872)\toπ^0π^0χ_{c1})/\mathcal{B}(X(3872)\toπ^+π^-J/ψ) < 1.1$ and $\mathcal{B}(X(3872)\toπ^0π^0χ_{c2})/\mathcal{B}(X(3872)\toπ^+π^-J/ψ) < 0.5$, taking into account both statistical and systematic uncertainties.

hep-ex↗

arXiv2024

Measurements of the $CP$-even fractions of $D^0\toπ^{+}π^{-}π^{0}$ and $D^0\to K^{+}K^{-}π^{0}$ at BESIII

The $CP$-even fractions ($F_{+}$) of the decays $D^0\toπ^{+}π^{-}π^{0}$ and $D^0\to K^{+}K^{-}π^{0}$ are measured with a quantum-correlated $ψ(3770)\to D\bar{D}$ data sample collected by the BESIII experiment corresponding to an integrated luminosity of 7.93 $\mathrm{fb}^{-1}$. The results are $F_{+}^{π^{+}π^{-}π^{0}}=0.9406\pm0.0036\pm0.0021$ and $F_{+}^{K^{+}K^{-}π^{0}}=0.631\pm0.014\pm0.011$, where the first uncertainties are statistical and the second systematic. These measurements are consistent with the previous determinations, and the uncertainties for $F_{+}^{π^{+}π^{-}π^{0}}$ and $F_{+}^{K^{+}K^{-}π^{0}}$ are reduced by factors of 3.9 and 2.6, respectively. The reported results provide important inputs for the precise measurement of the angle $γ$ of the Cabibbo-Kobayashi-Maskawa matrix and indirect $CP$ violation in charm mixing.

hep-ex↗

arXiv2024

Study of the decay $D^0\rightarrow ρ(770)^-e^+ν_e$

We present a study of the semileptonic decay $D^0\rightarrow π^-π^0e^{+}ν_{e}$ using an $e^+e^-$ annihilation data sample of $7.93~\mathrm{fb}^{-1}$ collected at the center-of-mass energy of 3.773 GeV with the BESIII detector. The branching fraction of $D^0\to ρ(770)^-e^+ν_e$ is measured to be $(1.439 \pm 0.033(\rm stat.) \pm 0.027(\rm syst.)) \times10^{-3}$, which is a factor 1.6 more precise than previous measurements. By performing an amplitude analysis, we measure the hadronic form-factor ratios of $D^0\to ρ(770)^-e^+ν_e$ at $q^2=0$ assuming the single-pole-dominance parametrization: $r_{V}=V(0)/A_1(0)=1.548\pm0.079(\rm stat.)\pm0.041(\rm syst.)$ and $r_{2}=A_2(0)/A_1(0)=0.823\pm0.056(\rm stat.)\pm0.026(\rm syst.)$.

hep-ex↗

arXiv2024

Search for the radiative transition $χ_{c1}(3872)\toγψ_2(3823)$

Using 9.0 $\rm fb^{-1}$ of $e^+e^-$ collision data collected at center-of-mass energies from 4.178 to 4.278 GeV with the BESIII detector at the BEPCII collider, we perform the first search for the radiative transition $χ_{c1}(3872)\toγψ_2(3823)$. No $χ_{c1}(3872)\toγψ_2(3823)$ signal is observed. The upper limit on the ratio of branching fractions $\mathcal{B}(χ_{c1}(3872)\toγψ_2(3823), ψ_2(3823)\toγχ_{c1})/\mathcal{B}(χ_{c1}(3872)\toπ^+π^- J/ψ)$ is set as 0.075 at the 90\% confidence level. Our result contradicts theoretical predictions under the assumption that the $χ_{c1}(3872)$ is the pure charmonium state $χ_{c1}(2P)$.

hep-ex↗

arXiv2024

Study of $D^{+} \to K_{S}^{0}K^{*}(892)^{+}$ in $D^{+} \to K_{S}^{0} K_{S}^{0} π^{+}$

Using a data sample of $e^+e^-$ collisions corresponding to an integrated luminosity of 7.93 $\rm fb^{-1}$ collected with the BESIII detector at the center-of-mass energy 3.773~GeV, we perform the first amplitude analysis of the decay $D^{+} \to K_{S}^{0} K_{S}^{0} π^{+}$. The absolute branching fraction of $D^{+} \to K_{S}^{0}K_{S}^{0} π^{+}$ is measured to be $(2.97 \pm 0.09_{\rm stat.} \pm 0.05_{\rm syst.})\times10^{-3}$. The dominant intermediate process is $D^{+} \to K_{S}^{0}K^{*}(892)^{+}$, whose branching fraction is determined to be $(8.72 \pm 0.28_{\rm stat.} \pm 0.15_{\rm syst.}) \times 10^{-3}$, including all the $K^*(892)^+$ decays.

hep-ex↗