arXiv subjects

V. Batozskaya

Publications and source records attributed to V. Batozskaya.

At least 19 recordsLinked to original sources

arXiv2026

Measurement of the relative phase between the strong and electromagnetic amplitudes in $\boldsymbol{J/ψ\to Σ^{+} \barΣ^{-}}$

Using 284 pb$^{-1}$ of $e^{+}e^{-}$ collision data collected with the BESIII detector at center-of-mass energies between 3.00 and 3.12 GeV, the relative phase between the strong and electromagnetic interaction amplitudes in the process $J/ψ\to Σ^+ \barΣ^-$ is determined. The relative phase is measured to be $(107.9 \pm 24.9)^{\circ}$ or $(-107.6 \pm 24.3)^{\circ}$, where the uncertainty includes both statistical and systematic sources. This is the first experimental determination of the strong-electromagnetic phase difference in $J/ψ$ decays to a hyperon-antihyperon pair. The branching fraction $\mathcal{B}_{J/ψ\to Σ^+ \barΣ^-}$ is measured to be $(1.14 \pm 0.04)\times 10^{-3}$ for the positive phase solution or $(1.19 \pm 0.04) \times 10^{-3}$ for the negative phase solution. These results provide important input for testing perturbative QCD predictions and studies of SU(3) flavor symmetry.

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arXiv2026

Observation of an Altered $a_{0}(980)$ Line shape in $D^{+} \rightarrow π^{+}ηη$

Using $20.3~{\rm fb}^{-1}$ of $e^+e^-$ collision data collected with the BESIII detector at $\sqrt{s}=3.773~{\rm GeV}$, we perform the first amplitude analysis of the decay $D^+\toπ^+ηη$. The intermediate process $D^+\to a_0(980)^+η$, $a_0(980)^+\toπ^+η$, is observed as the only significant component in the amplitude analysis, and its branching fraction is measured to be $(3.67\pm0.12_{\rm stat}\pm0.06_{\rm syst})\times10^{-3}$. The $π^+η$ mass spectrum associated with $a_0(980)^+η$ production exhibits a line shape that differs substantially from those observed in $D_{(s)}\to a_0(980)π$ and $D^0\to a_0(980)^-e^+ν_e$ decays. We examine several conventional descriptions of the $a_0(980)$ amplitude, including Flatté, dispersively modified Flatté, $T$-matrix, and $K$-matrix parameterizations. With reference $a_0(980)$ parameters, neither these models nor their extensions including additional small resonant or non-resonant amplitudes reproduce the observed line shape satisfactorily. When the $a_0(980)$ parameters are allowed to float, satisfactory fits can be obtained, but the pole mass is driven well above the $K\bar K$ threshold, inconsistent with the near-threshold character of the $a_0(980)$. The results reveal a tension between fit quality and the physical pole position in conventional direct-production amplitude models.

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arXiv2026

First Observation of the Radiative Decay $D^0 \to γω$

We report the first observation of the radiative charm decay $D^0 \to γω$ with a significance of $6.0σ$. The analysis uses 20.3\,$\rm{fb}^{-1}$ of $e^+e^-$ collision data collected by the BESIII detector at a center-of-mass energy of 3.773\,GeV, and employs a deep learning strategy based on the Particle Transformer architecture. The absolute branching fraction of $\mathcal{B}(D^0\toγω)=(2.12\pm 0.40_{\rm stat}\pm 0.25_{\rm syst})\times 10^{-5}$ confirms the dominance of long-distance hadronic dynamics in radiative charm decays and provides a valuable benchmark for testing non-perturbative QCD calculations of $D \to γV$ transitions.

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arXiv2026

Measurement of Born cross sections of $e^+e^-\to pK^{-}\barΣ^{0}$ + c.c. at $\sqrt{s}$ = 3.5-4.9 GeV and partial wave analysis at $\sqrt{s}$ = 3.773 GeV

Using $e^+e^-$ collision data collected by the BESIII detector at BEPCII corresponding to a total integrated luminosity of 44.6 $\rm fb^{-1}$, we present the first measurement of the Born cross sections for the process $e^+e^-\to pK^{-}\barΣ^{0}$ + c.c. at fifty-six center-of-mass energies between 3.51 and 4.95~GeV. By fitting the dressed cross sections of $e^+e^-\to pK^{-}\barΣ^{0}$ + c.c. with the assumption of a power-law function plus a charmonium(-like) resonance, i.e., $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, $Y(4230)$, $Y(4360)$, $ψ(4415)$, $ψ(4500)$, $Y(4660)$ or $ψ(4710)$, no significant charmonium(-like) state decaying into $pK^{-}\barΣ^{0}$ + c.c. is observed. The product of branching fractions and electronic partial widths including their upper limits at the 90\% confidence level are provided for each decay. In addition, a partial wave analysis of the process $e^+e^-\to pK^{-}\barΣ^{0}$ + c.c. at $\sqrt{s}$ = 3.773 GeV is performed to investigate $N^{*}$, $Λ^{*}$ and $Σ^{*}$ resonances in the $K^{-}\barΣ^{0}$ and $pK^{-}$ invariant mass spectra. Significant contributions are found from the $Λ(1520)$, $Σ(1670)$, $Σ(1915)$, $N(1900)$, $N(2300)$ and $N(2570)$. The masses, widths and production fractions for each component are determined.

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arXiv2026

Amplitude analysis of $ψ(3686)$ radiative decays into $π^{0} π^{0}$ system

A model-independent amplitude analysis of the $π^{0} π^{0}$ system produced in radiative $ψ(3686)$ decays is presented. The analysis is based on the unique dataset of $(2712.4\pm14.3)\times10^6$ $ψ(3686)$ decays collected by the BESIII detector. Scalar and tensor partial-wave contributions are obtained as piecewise functions of $M_{\text{inv}}(π^{0} π^{0})$ with minimal model assumptions. The observed contribution of the scalar partial wave exhibits similar behavior to the one reported in the study of radiative $J/ψ$ decays, while the tensor contributions provide no evidence for resonance-like structures except for the clearly visible $f_2(1270)$. The results are presented in the form of log-likelihood scans in $M_{\text{inv}}(π^{0} π^{0})$ bins, which preserve all the statistical information and account for relevant systematic uncertainties. The model-independent description provided in this paper allows to combine the presented results with other related data in the development of phenomenological models.

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arXiv2026

Measurement of the cross sections for $e^{+}e^{-}\to p\bar{n}π^{-}$ at center of mass energies from 3.510 to 4.946 GeV

Using a data sample corresponding to an integrated luminosity of 43.8~fb$^{-1}$ collected with the \mbox{BESIII} detector at 44 center-of-mass energy points between 3.510 and 4.946~GeV, the Born cross sections for the process $e^+e^- \to p \bar{n} π^-$ and its charge-conjugated process are measured. The energy dependence of the dressed cross sections is investigated to search for possible contributions from vector charmonium and charmonium-like states. No evidence for contributions from the $ψ(3770)$, $Y(4230)$, $Y(4360)$, $ψ(4415)$, $Y(4500)$, or $Y(4710)$ resonances is observed. The upper limits at the 90\% confidence level are determined for the products of the electronic partial widths and the branching fractions for the decays of these resonances into the $p \bar{n} π^- + \mathrm{c.c.}$ final state.

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arXiv2026

Search for the charmonium weak decay $ψ(2S)\to D_s^-π^+ + c.c.$ and $ψ(2S)\to D_s^-ρ^+ + c.c.$

Using the data sample of $(2712.4\pm14.3)\times 10^6$ $ψ(2S)$ events collected with the BESIII detector at the center-of-mass energy $\sqrt{s}=3.686\ \rm{GeV}$, we search for the weak decays $ψ(2S)\to D_s^-π^+ + c.c.$ and $ψ(2S)\to D_s^-ρ^+ + c.c.$ for the first time. Since no signal excess above the background is observed, the upper limits on the branching fractions at the 90\% confidence level are set to be $1.4\times 10^{-6}$ and $7.0\times 10^{-6}$ for $ψ(2S)\to D_s^-π^+ + c.c.$ and $ψ(2S)\to D_s^-ρ^+ + c.c.$, respectively.

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arXiv2026

Observation of a Threshold Enhancement in the $π^0π^0$ Mass Spectrum in $ψ(3686) \rightarrow π^{0}π^{0}J/ψ$ Decays

Using a data sample of $(2712.4\pm14.4)\times 10^{6}$ $ψ(3686)$ events collected with the BESIII detector, we report a high-precision study of the $π^{0}π^{0}$ mass spectrum from $ψ(3686)\rightarrowπ^{0}π^{0}J/ψ$ decays. The enhancement previously observed near the $ππ$ mass threshold in the $π^+π^-$ channel is confirmed, with a statistical significance exceeding 10$σ$. A fit with a Breit-Wigner function yields a mass of $M = 274.3\pm 2.1_{\rm stat.}\pm0.6_{\rm syst.}~{\rm MeV}/c^2$ and a width of $Γ= 17.1\pm 1.5_{\rm stat.}\pm0.5_{\rm syst.}~{\rm MeV}$, consistent with those from the $π^{+}π^{-}$ channel. By including final-state interactions, we analyze the data using both chiral perturbation theory (ChPT) and QCD multipole expansion (QCDME). While the ChPT model describes the higher-mass region above 0.3 GeV/$c^2$ well, it fails to reproduce the significant threshold enhancement. In contrast, the QCDME model, which incorporates the $S$- and $D$-wave admixture structure of $ψ(3686)$, provides a better description of the full $π^{0}π^{0}$ mass spectrum.

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arXiv2026

Determination of $U$-spin breaking parameters with an amplitude analysis of the decay $D^{0}\to K_{\text{S},\text{L}}^{0}π^{+}π^{-}$

We perform a simultaneous amplitude analysis of the decays $D^0 \to K_{\text{S}}^{0}π^{+}π^{-}$ and $D^0 \to K_{\text{L}}^{0}π^{+}π^{-}$ using an $e^+e^-$ collision data sample, corresponding to an integrated luminosity of $20.3\,\text{fb}^{-1}$, collected at the centre-of-mass energy of $3.773\,\text{GeV}$ with the BESIII detector. This study, based on a significantly larger dataset than that used in previous work, presents an updated measurement of the complex $U$-spin breaking parameters ($\hatρ$) associated with various $CP$ eigenstate resonant modes mediating the three-body decays. The magnitudes of the $\hatρ$ parameters range from $0.62$ to $4.45$, indicating substantial $U$-spin symmetry breaking. We also report the resonant fit fraction and obtain a model prediction for the average strong-phase parameters over regions of phase space for both decay modes.

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arXiv2026

Measurements of the absolute branching fractions of the $Λ_{c}^{+}$ hadronic decays

Based on 4.5 fb$^{-1}$ of $e^+e^-$ collision data collected at center-of-mass energies between 4599.53 MeV and 4698.82 MeV with the BESIII detector, the absolute branching fractions of twelve $Λ_c^+$ hadronic decay modes are measured with a double-tag technique. A global least-square fit is implemented simultaneously among different decay modes at different energy points. This paper gives the most precise results on the branching fractions of different decay modes to date, with precision improved by a factor of 2 to 3. Among them, the branching fraction of $Λ_c^+ \to p K^- π^+$ is determined to be $(6.61\pm0.11\pm0.12)\%$, where the first uncertainty is statistical and the second is systematic. In addition, the $e^+e^-\toΛ_c^+\barΛ_c^-$ Born cross sections and the effective form factors ($|G_{\rm eff}|$) at different energy points have been determined with the highest precision to date.}

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arXiv2026

Observation of $χ_{cJ}\to ΛK^0_S\bar Ξ^0 + c.c.$ and improved measurements of $χ_{cJ}\to ΛK^-\bar Ξ^+ + c.c.$

By analyzing $(2712.4\pm14.3)\times10^6$ $ψ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, we report the first observation of $χ_{cJ}\to ΛK^0_S\bar Ξ^0 + c.c.$ ($J=0,1,2$) with significances greater than $10σ$, including systematic uncertainties, and improved measurements of $χ_{cJ}\to ΛK^-\bar Ξ^+ + c.c.$ The branching fractions of these decays are determined to be $\mathcal{B}(χ_{c0}\to ΛK^0_S\bar Ξ^0+c.c.)=(1.13\pm0.13\pm0.13)\times10^{-4}$, $\mathcal{B}(χ_{c1}\to ΛK^0_S\bar Ξ^0+c.c.)=(0.74\pm0.08\pm0.07)\times10^{-4}$, $\mathcal{B}(χ_{c2}\to ΛK^0_S\bar Ξ^0+c.c.)=(1.16\pm0.11\pm0.14)\times10^{-4}$, $\mathcal{B}(χ_{c0}\to ΛK^-\bar Ξ^++c.c.)=(1.90\pm0.08\pm0.16)\times10^{-4}$, $\mathcal{B}(χ_{c1}\to ΛK^-\bar Ξ^++c.c.)=(1.40\pm0.05\pm0.11)\times10^{-4}$, and $\mathcal{B}(χ_{c2}\to ΛK^-\bar Ξ^++c.c.)=(1.95\pm0.07\pm0.15)\times10^{-4}$. The first uncertainties are statistical, and the second are systematic.

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arXiv2026

Observation of the electromagnetic Dalitz transition $J/ψ\to e^+ e^- η_c$

Using $(10.087\pm0.044)\times10^9$ $J/ψ$ events collected with the BESIII detector at the $e^+e^-$ BEPCII collider, we present the first observation of the electromagnetic Dalitz decay $J/ψ\to e^+ e^- η_c$. The relative branching fraction $R \equiv \frac{Γ(J/ψ\to e^+e^-η_c)}{Γ(J/ψ\to γη_c)}$ is determined to be $(0.65\pm0.02_{\rm stat.}\pm0.07_{\rm sys.})\%$, where the first uncertainty is statistical and the second systematic. The $q^2$-dependent form factors are also extracted, and no significant deviation from the theoretical prediction is seen.

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arXiv2026

First observation of the electromagnetic Dalitz decay $ψ(3686) \rightarrow μ^+ μ^- η^\prime$

Utilizing $(2712.4 {\pm} 14.3)\times10^{6}~ψ(3686)$ events collected by the BESIII detector at the symmetric $e^+ e^-$ collider BEPCII, we report the first observation of the electromagnetic Dalitz decay $ψ(3686) \to μ^+ μ^-η^{\prime} $ with a statistical significance of 6.1$σ$. The branching fraction is determined to be $\mathcal{B}(ψ(3686) \to μ^+ μ^- η^{\prime})=(4.1 \pm 1.0_{\rm stat.} \pm 0.4_{\rm syst.})\times 10^{-7}$. The ratio to the branching fraction of the radiative decay $ψ(3686) \to γη^{\prime}$ is estimated to be $(3.3\pm0.9)\times10^{-3}$, which is consistent with the prediction of the vector meson dominance model within $1σ$. Furthermore, using the branching fraction of $ψ(3686) \to e^+ e^- η^{\prime}$ previously measured by the BESIII experiment, the ratio between the muon and the electron channels is evaluated to be $0.22\pm0.07$, which is consistent with the calculation of the vector meson dominance model within $1σ$, and no significant violation of lepton flavor universality is found.

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arXiv2026

Updated measurement of the branching fraction of $D_s^+ \to τ^+ ν_τ$

Using a dataset of 7.33 fb$^{-1}$ of $e^+ e^-$ annihilation data collected with the BESIII detector at center-of-mass energies from 4.128 to 4.226 GeV, we report an updated measurement of the branching fraction of $D_s^+ \to τ^+ ν_τ$ via four $τ^+$ decay modes: $τ^+ \to e^+ ν_e \barν_τ$, $μ^+ ν_μ \barν_τ$, $π^+\barν_τ$, and $π^+ π^{0} \barν_τ$. The branching fraction is determined to be $\mathcal{B}({D_s^+ \to τ^+ ν_τ}) = (5.37 \pm 0.08_{\rm stat} \pm 0.06_{\rm syst})$ %. The product of the modulus of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cs}|$ and the $D_s^+$ decay constant $f_{D_s^+}$ is measured to be $f_{D_s^+} |V_{cs}| = (248.2 \pm 1.9_{\rm stat} \pm 1.4_{\rm syst} \pm 0.6_{\rm input} \pm 0.8_{\rm EM})$ MeV. Both the branching fraction and the product $f_{D_s^+} |V_{cs}|$ are the most precise results yet obtained. Then, taking $f_{D_s^+}$ from lattice quantum chromodynamics calculations results in $|V_{cs}| = 0.993 \pm 0.008_{\rm stat} \pm 0.006_{\rm syst} \pm 0.003_{\rm input} \pm 0.003_{\rm EM}$. Conversely, one finds $f_{D_s^+} = (255.0 \pm 1.9_{\rm stat} \pm 1.4_{\rm syst} \pm 0.6_{\rm input} \pm 0.8_{\rm EM})$ MeV when taking $|V_{cs}|$ from the CKMfitter group as an input. Combining with the world average value of $D_s^+ \to μ^+ ν_μ$, the ratio of the branching fractions between $D_s^+ \to τ^+ ν_τ$ and $D_s^+ \to μ^+ ν_μ$ is estimated to be $10.04 \pm 0.29$, which is consistent with the Standard Model prediction of lepton flavor universality.

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arXiv2026

Observation of $D^+ \to K^{0}ρ^+$ and $D^+\to K^{+}ρ^0$ in Doubly Cabibbo-Suppressed Decay $D^+ \to K^+π^+π^-π^0$

By analyzing an $e^+e^-$ collision data sample with an integrated luminosity of 20.3 fb$^{-1}$ collected with the BESIII detector at the center-of-mass energy of 3.773 GeV, we perform the first amplitude analysis on the doubly Cabibbo-suppressed decay $D^+ \to K^+π^+π^-π^0$ and report the first observation of $D^+ \to K^{*0}ρ^+$ and $D^+\to K^{*+}ρ^0$. The corresponding branching fractions are $(5.67\pm0.41_{\rm stat}\pm0.17_{\rm syst})\times10^{-4}$ and $(5.32\pm0.57_{\rm stat}\pm0.24_{\rm syst})\times10^{-4}$, respectively. These two $D\to VV$ decay both have large transverse polarizations. The longitudinal polarization fractions are measured to be $0.111\pm0.024_{\rm stat}\pm0.008_{\rm syst}$ and $0.263\pm0.049_{\rm stat}\pm0.015_{\rm syst}$, respectively. The branching fraction of the decay $D^+\to K^+ω$ is measured to be $(4.76\pm0.84_{\rm stat}\pm0.13_{\rm syst})\times 10^{-5}$.

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arXiv2026

Improved search for $ψ(3770) \to γη_{c}(1S, 2S)$ radiative transitions

Based on an integrated luminosity of $20.3~\mathrm{fb}^{-1}$ of $e^{+}e^{-}$ annihilation data collected at a center-of-mass energy of $3.773~\rm{GeV}$ with the BESIII detector operating at the BEPCII collider, an improved search for the radiative transitions $ψ(3770) \to γη_{c}(1S, 2S)$ is performed using the hadronic decays $η_{c}(1S, 2S) \to K^{0}_{S} K^{\pm} π^{\mp}$. No significant signal is observed. The corresponding 90$\%$ confidence level upper limits on the product branching fractions are set to be $5.0 \times 10^{-6}$ for the $η_{c}(1S)$ transition and $3.7 \times 10^{-6}$ for the $η_{c}(2S)$ transition. The 90$\%$ confidence level upper limits on the partial decay widths are also reported to be $Γ(ψ(3770) \to γη_{c}(1S)) < 5.5$ keV and $Γ(ψ(3770) \to γη_{c}(2S)) < 29.4~\rm{keV}$. With about seven times larger integrated luminosity than used previously, these results lower the upper limits by approximately a factor of three and two for the $η_{c}(1S)$ and $η_{c}(2S)$ transitions, respectively.

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arXiv2026

Precision Studies and Searches for CP Asymmetries in the Inclusive Decay $Λ_{c}^{+}\to ΛX$

Based on $e^{+}e^{-}$ annihilation data collected with the BESIII detector at center-of-mass energies from $4.600$ to $4.699~\mathrm{GeV}$, corresponding to an integrated luminosity of $4.5~\mathrm{fb}^{-1}$, we present the first measurement of the longitudinal polarization of $Λ$ hyperon produced in the inclusive decay $Λ_c^+ \to ΛX$, where $X$ denotes any allowed final states. The polarizations are determined to be $P_Λ=-0.393\pm0.055_{\rm stat}\pm0.020_{\rm syst}$ and $P_{\barΛ}=0.288\pm0.056_{\rm stat}\pm0.017_{\rm syst}$. A search for CP violation is performed using an asymmetry constructed from the $Λ$ polarization and the $Λ\to pπ^{-}$ decay asymmetry parameter, and $A_{\mathrm{CP}}^{\mathrm{pol}}=0.15\pm0.12_{\rm stat}\pm0.03_{\rm syst}$ was obtained. Furthermore, an updated measurement of the absolute branching fraction is reported as $B(Λ_c^+ \to ΛX)=(38.07\pm0.38_{\rm stat}\pm0.49_{\rm syst})\%$, representing a fourfold precision improvement over the previous BESIII measurement. A search for CP violation in the decay rate yields $A_{\mathrm{CP}}^{\mathrm{dir}}=(1.5\pm1.0_{\rm stat}\pm1.0_{\rm syst})\%$. No evidence for CP violation is observed in this inclusive charm baryon decay. The subscripts `stat' and `syst' denote statistical and systematic uncertainties, respectively.

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arXiv2026

Observation of $η(2600)$ and Threshold Enhancements in the $Λ\barΛ$ System

Using $2712.4 \pm 14.3$ million $ψ(3686)$ events collected with the BESIII detector, the $Λ\barΛ$ system produced in $ψ(3686)$ radiative decays is studied. A model-independent partial wave analysis reveals a significant threshold enhancement structure dominated by the $^1S_0$ and $^3P_0$ partial waves, corresponding to $J^{PC} = 0^{-+}$ and $0^{++}$, respectively. In addition, a new pseudoscalar resonance, designated as $η(2600)$, is observed in the $^1S_0$ partial wave with a mass value consistent with the previously reported $X(2600)$ state, which represents the heaviest light meson observed to date. These results enhance our understanding of baryon-antibaryon threshold dynamics and the pseudoscalar light hadron spectroscopy.

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