arXiv subjects

X. Y. Chen

Publications and source records attributed to X. Y. Chen.

At least 19 recordsLinked to original sources

arXiv2026

Search for the reaction channel $e^+ e^- \to ηη\,J/ψ$ and the isospin partner of the $Z_c(3900)$ at center-of-mass energies $\sqrt{s} = 4.226-4.950$ GeV

We search for the reaction channel $e^+ e^- \to ηη\,J/ψ$ in a data sample with center-of-mass energies from 4.226 to 4.950 GeV that was collected by the BESIII detector operating at the Beijing Electron Positron Collider (BEPCII). The data analysis is performed with two different reconstruction methods, exclusive and semi-inclusive, enabling a comparison and combination of the results. Only at a few energy points a non-zero cross section is observed with a statistical significance of more than 3$σ$ using one of the methods. Therefore, the corresponding upper limits of the cross section at the 90% confidence level are determined. The energy dependent results show clear deviations from the the line shape expected from three-body phase space alone. Since the statistical significance for almost all center-of-mass energies is low, the upper limits for the reaction channel $e^+ e^- \to ηη\,J/ψ$ also serve as limits for the existence of a possible isospin partner to the charmonium-like isospin triplet $Z_{\rm c}(3900)$ which decays to $J/ψη$.

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arXiv2026

Search for the radiative decay $D^+_s \to γK^*(892)^+$

Using 7.33 fb$^{-1}$ of $e^+e^-$ collision data samples collected with the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV, we perform a simultaneous fit to search for the radiative decay $D_s^+\toγK^*(892)^+$ via $K^*(892)^+\to K^+π^0$ and $K^*(892)^+\to K_S^0π^+$ for the first time. No significant signals are observed. The upper limit on the branching fraction of $D^+_s\toγK^*(892)^+$ is set to be $2.3\times10^{-4}$ at the $90\%$ confidence level.

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arXiv2026

Improved amplitude analysis of $η^\prime\toπ^+π^-π^0$ and $η^\prime\toπ^0π^0π^0$

Using a sample of $(10087\pm44)\times 10^6$ $J/ψ$ events collected with the BESIII detector at BEPCII, we perform an amplitude analysis of the decays $η^\prime\toπ^+π^-π^0$ and $η^\prime\toπ^0π^0π^0$, where we observe significant $π^\pmπ^0$ $P$-wave and $π$-$π$ $S$-wave interactions. Two different parameterizations, a $π$-$π$ scattering phase shift and the Gounaris-Sakurai Breit-Wigner formalism, are used to describe the $P$-wave propagator. Due to the large interference, the branching fractions for both the $P$- and the $S$-waves are found to be strongly model dependent.

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arXiv2026

Observation of double $s\bar{s}$ production in $e^+e^-$ collision at $\sqrt{s} = 3.08~\textrm{GeV}$

We report the observation of significant double-$s\bar{s}$ production in the $e^+e^-$ continuum, based on the measurement of prompt $ϕ$ mesons produced in association with hadrons containing an $s$ quark or an $s\bar{s}$ pair. In an analysis of $e^+e^-$ collision data collected by the BESIII experiment at $\sqrt{s}=3.08~\textrm{GeV}$, the ratio $σ(e^+e^- \to ϕ s\bar{s}+\textrm{anything}) / σ(e^+e^-\rightarrowϕ+\textrm{anything})$ is determined to be $(40.4\pm1.7_{\rm stat.}\pm1.5_{\rm syst.})\%$ by detecting and measuring $e^+e^-\toϕ+ X(s\bar{s})$, where $X(s\bar{s})$ denotes an $η$ meson, an $η^{\prime}$ meson, or one of the strange-meson pairs $K^+K^-$, $K^+K^{*-}$, $K^-K^{*+}$, $K^0\bar{K}^{0}$, and $K^0\bar{K}^{*0}+\textrm{c.c.}$. The level of double-$s\bar{s}$ production is in line with the double-$c\bar{c}$ production reported by the Belle and \babar\ collaborations, for which theoretical calculations predict lower rates. The experimental measurement of double $s\bar{s}$ production at BESIII can shed light on the understanding of quark hadronization and QCD.

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arXiv2026

Evidence for the semileptonic decay $Λ_c^{+} \to p π^{-} e^+ ν_e$

Based on $4.5\, \mathrm{fb}^{-1}$ of $e^+e^-$ collision data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between $4.600\,\mathrm{GeV}$ and $4.699\,\mathrm{GeV}$, the first search for the Cabbibo-suppressed semileptonic decay $Λ_c^+\to pπ^-e^+ν_e$ is performed. The branching fraction of $Λ_c^+\to pπ^-e^+ν_e$ is measured to be $(2.96\pm0.95_{\rm stat}\pm0.23_{\rm syst})\times10^{-4}$ with a signal significance of $4.2σ$.

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arXiv2026

Search for charmonium(like) states $X$ in $e^{+}e^{-}\rightarrowγX\rightarrowγD^{0}\bar{D}^{0}$ at BESIII

A search is performed for a state $X$ decaying into $D^{*0}\bar{D}^{*0}$ produced in the process $e^{+}e^{-}\rightarrowγX$ using a data sample corresponding to an integrated luminosity of 1667.4 $\rm pb^{-1}$ collected at $\sqrt{s} = 4.682$ GeV with the BESIII detector at the BEPCII. The state $X$ could be one of the $C$-even states $X(4013)$, $η_{c}(3S)$, $χ_{c0}(3P)$, $χ_{c1}(3P)$, or $χ_{c2}(3P)$. No significant signal is observed in the corresponding signal region. Upper limits of $σ_{e^{+}e^{-}\rightarrowγX}\cdot {\rm Br}_{X\rightarrow D^{*0}\bar{D}^{*0}}$ at 90% confidence level are provided, where $σ_{e^{+}e^{-}\rightarrowγX}$ represents the cross section of the $e^{+}e^{-}\rightarrowγX$ process, and ${\rm Br}_{X\rightarrow D^{*0}\bar{D}^{*0}}$ is the branching fraction of the $X\rightarrow D^{*0}\bar{D}^{*0}$ process.

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arXiv2026

Measurement of the cross sections of $e^+e^-\to K_{S}^{0}\barΞ^{0}Λ/Σ^{0} + \text{c.c.}$ at center-of-mass energies between 3.510 and 4.951 GeV

Using $e^+e^-$ collision data samples collected with the BESIII detector at the BEPCII at center-of-mass energies between 3.510 and 4.951 GeV corresponding to an integrated luminosity of 44.55 fb$^{-1}$, the Born cross sections of the processes $e^+e^- \to K_S^0 \barΞ^0 Λ/Σ^0+\text{c.c.}$ are measured with a partial-reconstruction strategy. The dressed cross sections for the channels $e^+e^- \to K_S^0 \barΞ^0 Λ/Σ^0 + \text{c.c.}$ are fitted with a model consisting of a power-law function and a charmonium (-like) resonance, considering the candidates $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, $Y(4230)$, $Y(4360)$, $ψ(4415)$, $Y(4500)$, $Y(4660)$, and $Y(4710)$. No significant resonance contribution is observed in any of the fits. The upper limits for the products of the electronic partial widths and branching fractions at the 90% confidence level are provided.

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arXiv2026

First Observation and Dynamical Study of the $D^+_s\to f_{0}(980) μ^+ν_μ$ Decay

Using 7.33 fb$^{-1}$ of $e^+e^-$ annihilation data recorded with the BESIII detector at center-of-mass energies from 4.128 to 4.226 GeV, we report the first observation and dynamical study of the semileptonic decay $D^+_s\to f_{0}(980) μ^+ν_μ$. The absolute branching fraction of $D^+_s\to f_{0}(980) μ^+ν_μ$ with $ f_{0}(980)\to π^+ π^-$ is $(1.59 \pm 0.18_{\rm stat} \pm 0.11_{\rm syst}) \times10^{-3}$. Combining this result with our earlier BESIII measurement of ${\mathcal B}(D^+_s\to f_{0}(980) e^+ν_e)$, their ratio is found to be $\frac{{\mathcal B}(D^+_s\to f_{0}(980) μ^+ν_μ)}{{\mathcal B}(D^+_s\to f_{0}(980)e^+ν_e)} = 0.92\pm0.13_{\rm stat}\pm0.08_{\rm syst}$, in agreement with the Standard Model expectation of lepton flavor universality. From a dynamical analysis of the $D_{s}^{+} \to f_{0}(980)μ^+ν_μ$ decay with a simple pole parametrization for the hadronic transition form factor, the product of the form factor $f^{f_{0}(980)}_{+}(0)$ and the $c\to s$ Cabibbo-Kobayashi-Maskawa matrix element $|V_{cs}|$ is determined to be $f^{f_{0}(980)}_{+}(0)|V_{cs}|=0.490\pm0.059_{\rm stat}\pm0.025_{\rm syst}$. Averaging with our previously reported result for the $D_{s}^{+} \to f_{0}(980)e^+ν_e$ decay, we obtain $f^{f_{0}(980)}_{+}(0)|V_{cs}|=0.500\pm0.016_{\rm stat}\pm0.020_{\rm syst}$. Using $|V_{cs}|$ from the CKMfitter group, we extract $f^{f_{0}(980)}_{+}(0)=0.514\pm0.017_{\rm stat}\pm0.021_{\rm syst}$. This represents the most precise determination of the $D_{s} \to f_{0}(980)$ transition form factor to date, and provides stringent tests of various theoretical models.

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arXiv2026

Exploring baryon semi-leptonic decays through polarization and entanglement

The unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix is a cornerstone of the Standard Model (SM). Precise tests of this unitarity require independent determinations of its elements, such as $|V_{us}|$, which governs the transition between strange and up quarks. Current measurements from kaon and tau decays show tensions that may hint at physics beyond the SM. Hyperon semi-leptonic decays provide alternative probes, but have remained largely untapped because previous experiments lacked sufficient kinematic information, rendering the measurements insensitive to the relevant form factors. Here we report measurements of the axial-vector and weak-magnetism couplings, as well as the first determinations of the absolute branching fraction and weak-electricity coupling in $Λ\to p e^{-}\barν_e$, achieved by exploiting the polarization and quantum entanglement of $Λ\barΛ$ pairs produced at the $J/ψ$ resonance. Combining our results with recent lattice Quantum Chromodynamics calculations gives $|V_{us}|_{\rm LQCD}=0.2339\pm0.0041$, a model-independent determination consistent with CKM unitarity. By pioneering the exploitation of polarization and quantum entanglement in baryon semi-leptonic decays, our method enhances single-event sensitivity and it is broadly applicable to other baryon semi-leptonic decays, establishing the foundation for a systematic research program that can achieve precision comparable to that of kaon decays and provide a stringent independent test of the SM.

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arXiv2026

Measurement of Born Cross Section for $e^+e^-\to K_S^0\barΞ^+Σ^-+\rm{c.c.}$ at $\sqrt{s} = 3.51-4.95$ GeV

Using $e^+e^-$ collision data collected with the BESIII detector at the BEPCII collider corresponding to a total integrated luminosity of 44~fb$^{-1}$, we present the first measurement of the Born cross sections for the process $e^+e^-\to K_S^0\barΞ^+Σ^-$ at 56 center-of-mass energies from 3.510 to 4.951~GeV. By fitting the dressed cross sections of $e^+e^-\to K_S^0\barΞ^+Σ^-$ with the assumption of a power-law function plus a charmonium(-like) resonance, i.e. $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, $Y(4230)$, $Y(4360)$, $ψ(4415)$, $Y$(4500), $Y(4660)$, and $Y$(4710), no significant signal of any charmonium(-like) state decaying into the $K_S^0\barΞ^+Σ^-$ is observed. Upper limits on the product of the electronic width and branching fraction at the 90% confidence level are given for each resonance. Combining this result with the previous measurement of the isospin-symmetric process $e^+e^-\to K^{-} \barΞ^{+} Σ^{0} $, the ratio of the Born cross sections, $R=σ^{B}(e^+e^-\to K_S^0\barΞ^+Σ^-)/$$σ^{B}(e^+e^-\to K^-\barΞ^+Σ^0)$, is found to be consistent with unity.

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arXiv2026

Search for the doubly Cabibbo-suppressed decays $D^0\to K^+π^-η^\prime$ and $D^+\to K^+π^0η^\prime$

We present the first search for the doubly Cabibbo-suppressed decays $D^0\to K^+π^-η^\prime$ and $D^+\to K^+π^0η^\prime$ using an $e^+e^-$ collision data sample corresponding to an integrated luminosity of 20.3 fb$^{-1}$, collected at a center-of-mass energy of 3.773 GeV with the Beijing Spectrometer III (BESIII) detector at the Beijing Electron-Positron Collider II (BEPCII). No significant signals are observed, and the upper limits on their decay branching fractions are set to be $3.0\times 10^{-5}$ and $2.1\times 10^{-5}$ at the 90% confidence level, respectively. By combining these results with the world-average branching fractions of the corresponding Cabibbo-favored decays, upper limits at the 90% confidence level are obtained on the ratios of doubly Cabibbo-suppressed to Cabibbo-favored branching fractions. The limits are determined to be $1.6\times \tan^4θ_C$ and $3.7\times \tan^4θ_C$ for $D^0\to K^+π^-η^\prime$ and $D^+\to K^+π^0η^\prime$, respectively, where $θ_C$ denotes the Cabibbo mixing angle.

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arXiv2026

Measurement of the $Λ$ Electric Dipole Moment with an Entangled Baryon-Antibaryon System

The dominance of matter over antimatter in the universe has consistently driven the pursuit of new physics beyond the Standard Model that violates charge-parity symmetry. Strange baryons (hyperons) remain a largely unexplored territory in which interactions between hyperons and particles from new physics could induce a nontrivial electric dipole moment (EDM). However, direct measurements of hyperon EDMs through spin precession are highly challenging owing to their short lifetimes. In this work, we introduce a method to extract the EDM of the lightest hyperon, $Λ$, using the entangled $Λ$$\overlineΛ$ system. Our result is consistent with zero, achieving a three-orders-of-magnitude improvement over the previous upper limit established in the 1980s with comparable statistics, providing stringent constraints on potential new physics.

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arXiv2026

Measurement of CP Asymmetry Parameters and Polarization Correlations in $Ω^{-}\barΩ^{+}$ Pairs

Using $(2.71 \pm 0.01) \times 10^9$ $ψ(3686)$ events collected with the BESIII detector, a joint full angular distribution analysis is carried out for the process $ψ(3686) \to Ω^-(\toΛK^-) \, \barΩ^{+}(\to \barΛK^+)$. The first simultaneous measurement of the weak decay parameters $ϕ_{Ω^{-}}$ and $ϕ_{\barΩ^{+}}$ for $Ω^- \to K^-Λ$ and $\barΩ^+ \to K^+\barΛ$ is performed, yielding the first result for the CP-sensitive observable, $ϕ_{\rm CP} = (-0.004 \pm 0.055 \pm 0.017)~\text{rad}$, where the first and second uncertainties are statistical and systematic, respectively. This further enables the extraction of the weak and strong phase differences between the $P$- and $D$-wave amplitudes: $(ξ_D - ξ_P) = (-0.15 \pm 2.25 \pm 0.69)~\text{rad}$ and $(δ_D - δ_P) = (-0.97 \pm 0.88 \pm 0.34)~\text{rad}$. Additionally, the polarization correlations between $Ω^{-}$ and $\barΩ^{+}$ are measured.

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arXiv2026

First Observation of $D^{0(+)}\to \bar Kωe^+ν_e$ and Determination of the Branching Fraction of $\bar K_1(1270)\to \bar K ω$

Using 20.3~fb$^{-1}$ of $e^+e^-$ annihilation data collected at a center-of-mass energy of 3.773~GeV with the BESIII detector, we report the first observation of the semileptonic decays \mbox{$D^0\to K^-ωe^+ν_e$} and \mbox{$D^+\to K_S^0ωe^+ν_e$} with significances of $8.0σ$ and $5.8σ$, respectively. Their decay branching fractions are measured to be ${\cal B}(D^0\to K^-ωe^+ν_e)=(9.4^{+2.0}_{-1.8}\pm 0.6)\times10^{-5}$ and ${\cal B}(D^+\to K_S^0ωe^+ν_e)=(8.0^{+2.4}_{-2.1}\pm 0.7)\times10^{-5}$. Combining these with the latest measurements of $D^{0(+)}\to K^-π^+π^{-(0)} e^+ν_e$ and assuming $\bar{K}_1(1270)$ to be the sole mediating resonance in all processes, the branching ratios are determined to be $\frac{Γ(K_1(1270)^-\to K^-π^+π^-)}{Γ(K_1(1270)^-\to K^-ω)} = 3.4^{+0.8}_{-0.7} \pm 0.3$ and $\frac{Γ(\bar{K}_1(1270)^0\to K^-π^+π^0)}{Γ(\bar{K}_1(1270)^0\to \bar{K}^0ω)} = 7.9^{+2.4}_{-2.1} \pm 0.7$. The combined branching fraction is determined to be $\mathcal B(\bar{K}_1(1270)\to \bar{K}ω) = (8.4\pm 1.4 \pm 0.5)\%$, which is the most precise measurement from a collider experiment. Furthermore, %based on the $\bar{K}π^+π^-π^0$ invariant mass spectra, for the first time based on a single vector-pseudoscalar decay channel, the $\bar{K}_1(1270)$ mass is measured to be $(1336 \pm 9 \pm 2)$~MeV/$c^2$, providing unique experimental support for the two-pole structure of the $\bar{K}_1(1270)$ resonance. The first uncertainties are statistical, and the second are systematic.

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arXiv2026

Study of $K_{S}^{0}$-$K_{L}^{0}$ asymmetry in the decays $D^0 \to K_{S}^{0}ω$ and $D^0 \to K_{L}^{0} ω$

Based on $e^+ e^-$ annihilation data corresponding to an integrated luminosity of 7.93~$fb^{-1}$ collected at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider, the absolute branching fractions of the decays $D^0 \to K_{S}^{0} ω$ and $D^0 \to K_{L}^{0} ω$ are measured to be $(11.79 \pm 0.19 \pm 0.26 \pm 0.47) \times 10^{-3}$ and ($10.84 \pm 0.14 \pm 0.23 \pm 0.44) \times 10^{-3}$, respectively. The $K_{S}^{0}- K_{L}^{0}$ branching-fraction asymmetry of these two decays is $R(D^0,K_{S,L}^{0} ω) = \frac{\mathcal{B}(D^0 \to K_{S}^{0} ω) - \mathcal{B}(D^0 \to K_{L}^{0}ω)}{\mathcal{B}(D^0 \to K_{S}^{0} ω) + \mathcal{B}(D^0 \to K_{L}^{0} ω)} =(4.2 \pm 1.0 \pm 0.9 \pm 2.8)\%$. Here, the first uncertainties are statistical, the second systematic, and the third arise from the interference between $D^0 \to K_{S,L}^{0} ω$ and the non-resonant $D^0 \to π^+ π^- π^0 K_{S,L}^{0}$ processes.

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arXiv2026

Search for the baryonic decay $ D_{s}^{*+} \to \ p \bar{n} $

The first search for the baryonic decay $ D_{s}^{*+} \to \ p \bar{n} $ is performed using $e^+e^-$ collision data taken at center-of-mass energies between 4.128 and 4.226 GeV, collected by the BESIII experiment and corresponding to an integrated luminosity of 7.33 fb$^{-1}$. No significant signal is observed, and an upper limit on the branching fraction is set to be $1.3\times 10^{-4}$ at the $90\%$ confidence level.

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arXiv2026

Observation of $ψ(3686)\to p K^- K_S^0 \bar Ξ^0+c.c.$

Using a sample of $(2.712 \pm 0.014) \times 10^{9}$ $ψ(3686)$ events collected with the BESIII detector, the decay of $ψ(3686)\to p K^- K_S^0 \bar Ξ^0+c.c.$ is observed for the first time with a statistical significance of $11.5σ$. The branching fraction of this decay is measured to be $(2.84\pm 0.40\pm 0.25) \times 10^{-6}$, where the first and second uncertainties are statistical and systematic, respectively. This measurement extends the experimental information on rare multi-strange $ψ(3686)$ decays and provides an experimental reference for future studies of related decay modes.

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arXiv2026

Measurement of inelastic scattering $Λ(\overlineΛ)+p\toΣ^{0}(\overlineΣ^{0})+p$ via $e^+e^-\to J/ψ\toΛ\overlineΛ$

Using a sample of $(10087\pm44)\times10^{6}$ $J/ψ$ events collected with the BESIII detector, we investigate the inelastic scattering processes $Λ+p\toΣ^{0}+p$ and $\overlineΛ+p\to\overlineΣ^{0}+p$, exploiting hyperons from $J/ψ\toΛ\overlineΛ$ decays as an effective beam and the beam-pipe materials as targets. The processes $Λ+{}^{9}\mathrm{Be}\toΣ^{0}+p+{}^{8}\mathrm{Li}$ and $\overlineΛ+{}^{9}\mathrm{Be}\to\overlineΣ^{0}+p+{}^{8}\mathrm{Li}$ are measured at a hyperon momentum of $1.074~\mathrm{GeV}/c$, with cross sections of $(10.1\pm1.4_{\rm stat}\pm0.7_{\rm syst})$ mb and $(1.7\pm0.6_{\rm stat}\pm0.4_{\rm syst})$ mb, respectively. Under the assumption of surface-dominated hyperon-nucleus scattering, these measurements are used to extract the corresponding proton-target cross sections. Independently, direct measurements using the hydrogen component of the beam-pipe oil yield $(3.2\pm1.1_{\rm stat}\pm0.5_{\rm syst})$ mb for $Λ+p\toΣ^{0}+p$ and $(1.5\pm0.5_{\rm stat}\pm0.1_{\rm syst})$ mb for $\overlineΛ+p\to\overlineΣ^{0}+p$, consistent with the indirect determinations. The combined cross sections are $(4.7\pm0.7)$ mb and $(1.1\pm0.3)$ mb, respectively. The $\overlineΛ+p\to\overlineΣ^{0}+p$ signal constitutes the first evidence for anti-hyperon inelastic scattering with baryonic final states, with a significance of $3.1σ$. The pronounced difference between the $Λp$ and $\overlineΛp$ inelastic scattering cross sections provides new experimental constraints on hyperon-nucleon and anti-hyperon-nucleon interactions.

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