arXiv subjects

X. C. Dai

Publications and source records attributed to X. C. Dai.

At least 19 recordsLinked to original sources

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

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 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.

hep-ex↗

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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arXiv2026

Observation of the $X(2370)$ in $J/ψ\rightarrowγK^{0}_{S}K^{0}_{S}π^{0}$ and $J/ψ\rightarrowγπ^{0}π^{0}η$

Based on $(10087\pm44)\times10^{6}$ $J/ψ$ events collected with the BESIII detector, the $J/ψ\rightarrowγK^{0}_{S}K^{0}_{S}π^{0}$ and $J/ψ\rightarrowγπ^{0}π^{0}η$ processes are studied. The $X(2370)$ is observed in both the $K^{0}_{S}K^{0}_{S}π^{0}$ and $π^{0}π^{0}η$ invariant mass spectra, with statistical significances greater than $14σ$ and $20σ$, respectively. By combining measurements from these processes with those from the previously reported $J/ψ\rightarrowγK^{0}_{S}K^{0}_{S}η^{\prime}$ process, the mass and width of the $X(2370)$ are determined to be $2359^{+13}_{-14}~\text{MeV}/c^{2}$ and $170^{+44}_{-29}~\text{MeV}$, respectively. In addition, the decay $X(2370)\to a_{0}(980)^{0}π^{0}$ with $a_{0}(980)^{0}\to π^{0}η$ is observed with a statistical significance exceeding $9σ$. The properties of the $X(2370)$\textemdash decay pattern similarities to that of $η_{c}$, are consistent with those of a pseudoscalar glueball.

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arXiv2026

Observation of the $χ_{cJ}$ decays into $pK^{-}\barΛη+\mathrm{c.c.}$

By analyzing $(2712.4 \pm 14.3) \times 10^{6}$ $ψ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays $χ_{cJ} \to pK^{-}\barΛη+ \mathrm{c.c.}$ ($J=0,1,2$) are observed for the first time, with statistical significances exceeding $5σ$ for all three $χ_{cJ}$ states. The measured branching fractions are $\mathcal{B}(χ_{c0} \to pK^{-}\barΛη+ \mathrm{c.c.}) = (5.3 \pm 0.7 \pm 0.5) \times 10^{-5}$, $\mathcal{B}(χ_{c1} \to pK^{-}\barΛη+ \mathrm{c.c.}) = (9.8 \pm 0.6 \pm 0.6) \times 10^{-5}$, and $\mathcal{B}(χ_{c2} \to pK^{-}\barΛη+ \mathrm{c.c.}) = (9.3 \pm 0.6 \pm 0.6) \times 10^{-5}$, where the first uncertainties are statistical and the second are systematic. Structures consistent with the known hyperon resonances $Λ(1520)$ and $\barΛ(1690)$ are seen in the $pK^{-}$ and $\barΛη$ invariant mass spectra, respectively. The reported branching fractions include both resonant and non-resonant contributions. These results provide new experimental information on hadronic decays of $P$-wave charmonium states and contribute to the understanding of baryon production and hadronization dynamics in the nonperturbative QCD regime.

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arXiv2026

Evidence for $η_{c}(2S)\to p\bar{p}π^{+}π^{-}π^{0}$ and observation of $χ_{cJ} \to p\bar{p}π^{+}π^{-}π^{0}$

Using $(2.712\pm0.014)\times 10^9$ $ψ(3686)$ events collected by the BESIII detector at the BEPCII collider, the $ψ(3686) \to γp\bar{p}π^+π^-π^0$ process is investigated. Evidence for the decay of $η_{c}(2S)\to p\bar{p}π^{+}π^{-}π^{0}$ is found with a signal significance of 3.3$σ$. The product of branching fractions of $\mathcal{B}[ψ(3686)\to γη_{c}(2S)]\times\mathcal{B}[η_{c}(2S)\to p\bar{p}π^{+}π^{-}π^{0}]$ is determined to be $(3.4\pm0.5\pm0.8) \times 10^{-6}$, where the first uncertainty is statistical and the second systematic. The hadronic decays of $χ_{cJ} \to p\bar{p}π^+π^-π^0$$~(J=0,1,2)$ are observed, and their branching fractions are measured to be $\mathcal{B}(χ_{c0}\to p\bar{p}π^{+}π^{-}π^{0})=(4.79\pm 0.01\pm0.40) \times 10^{-3}$, $\mathcal{B}(χ_{c1}\to p\bar{p}π^{+}π^{-}π^{0})=(2.13\pm 0.01\pm0.17) \times 10^{-3}$, and $\mathcal{B}(χ_{c2}\to p\bar{p}π^{+}π^{-}π^{0})=(3.72\pm 0.01\pm0.29) \times 10^{-3}$, respectively. Furthermore, the branching fractions for the intermediate processes $χ_{cJ}\to p\bar{p}ω$ are updated with significantly improved precision: $\mathcal{B}(χ_{c0}\to p\bar{p}ω)=(5.76\pm0.01\pm0.42)\times10^{-4}$, $\mathcal{B}(χ_{c1}\to p\bar{p}ω)=(1.85\pm0.01\pm0.13)\times10^{-4}$, and $\mathcal{B}(χ_{c2}\to p\bar{p}ω)=(4.51\pm0.01\pm0.33)\times10^{-4}$, respectively.

hep-ex↗