Bo Wang’s research while affiliated with Shanghai Institute of Microsystem and Information Technology and other places

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Publications (632)


Search for e + e − → φ χ c 0 and φ η c 2 ( 1 D ) at center-of-mass energies from 4.47 to 4.95 GeV
  • Article
  • Full-text available

January 2025

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2 Reads

Physical Review D

M. Ablikim

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M. N. Achasov

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P. Adlarson

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J. Zu

Utilizing a dataset 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 − → ϕ χ c 0 and ϕ η c 2 ( 1 D ) 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 dressed cross sections for e + e − → ϕ χ c 0 , as well as the product of the dressed cross section for e + e − → ϕ η c 2 ( 1 D ) 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 ) → ϕ χ c 0 , denoted as Γ e + e − Y ( 4660 ) B Y ( 4660 ) → ϕ χ c 0 , is determined to be < 0.35 eV at the 90% confidence level. Published by the American Physical Society 2025

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Measurement of the branching fractions of the decays Λ c + → Λ K S 0 K + , Λ c + → Λ K S 0 π + , and Λ c + → Λ K * +

January 2025

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2 Reads

Physical Review D

Studies are performed of the Cabibbo-favored decay Λ c + → Λ K S 0 K + and the singly Cabibbo-suppressed decay Λ c + → Λ K 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 + → Λ K S 0 π + is observed for the first time. The branching fractions of Λ c + → Λ K S 0 K + and Λ c + → Λ K S 0 π + are measured to be ( 3.04 ± 0.30 ± 0.16 ) × 10 − 3 and ( 1.73 ± 0.27 ± 0.10 ) × 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 + → Λ K S 0 π + decay is found with a statistical significance of 4.71 σ . The branching fraction of Λ c + → Λ K * + is calculated under three possible interference scenarios, with the significance increasing to 5.03 σ when interference is taken into account. Published by the American Physical Society 2025


FIG. 1. Fits to the M (γX) invariant mass distributions, where X represents (I) π + π − , (II) π + π − η, (III) 2(π + π − ), and (IV) p¯ p. The dots with error bars are data, the red solid line is the fitting result, the pink dashed line is the signal shape, the blue dashed line is the smooth background and the other dashed lines represent the peaking backgrounds.
Observation of hch_{c} radiative decays to multiple light hadrons and the tensor state $f_2(1270)

Using ψ(3686)π0hc\psi(3686)\rightarrow \pi^{0} h_{c} decays from a data sample of (27.12±0.14)×108(27.12\pm0.14)\times10^{8} ψ(3686)\psi(3686) events collected by the BESIII detector at the BEPCII collider, hch_c radiative decays to γπ+π, γπ+πη, γ2(π+π)\gamma\pi^{+}\pi^{-},~\gamma\pi^{+}\pi^{-}\eta,~\gamma2(\pi^{+}\pi^{-}), and γppˉ\gamma p\bar{p} are observed for the first time, each with a significance greater than 5σ5\sigma. The corresponding branching fractions are measured. Furthermore, intermediate states below 2.8 GeV/c2c^{2} are investigated, leading to the first observation of the decay process of hcγf2(1270)γπ+πh_c\rightarrow\gamma f_{2}(1270)\rightarrow\gamma\pi^{+}\pi^{-} with a significance of 5.5σ5.5\,\sigma. This observation represents the first instance of hch_c radiative decay to a tensor state.


Search for a massless dark photon in c → u γ ′ decays

January 2025

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10 Reads

Physical Review D

Using 7.9 f b − 1 of e + e − collision data collected at 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 → ω γ ′ and D 0 → γ γ ′ 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 × 10 − 5 and 2.0 × 10 − 6 for D 0 → ω γ ′ and D 0 → γ γ ′ , respectively. These results provide the most stringent constraint on the new physics energy scale associated with c u γ ′ coupling in the world, with the new physics energy scale related parameter | C | 2 + | C 5 | 2 < 8.2 × 10 − 17 GeV − 2 at the 90% confidence level. Published by the American Physical Society 2025


FIG. 1. Fits to the M BC distributions of different ST modes. The black dots with error bars are data. The red solid curves indicate the fit results and the blue dashed curves describe the background shapes. The pink and purple dashed curves are the signal and peaking background shapes, respectively.
FIG. 2. Projections of the 2D fits on the M sig BC distribution for the decay D → π þ π − π 0 . The black dots with error bars are data. The red solid curves represent the fit results and the blue dashed curves describe the nonpeaking background shapes. The pink, green and purple dashed curves are the shapes of the signals, the backgrounds with correctly reconstructed signal mode but incorrectly reconstructed tag modes and the very small peaking backgrounds, respectively.
FIG. 4. Fits to the M 2 miss distributions of the tag modes (left) D → K 0 L ω π þ π − π 0 , (middle) D → K 0 L π 0 and (right) D → K 0 L π 0 π 0 . The top row is for the signal decay D → π þ π − π 0 and the bottom row for the signal decay D → K þ K − π 0 . The black dots with error bars are data. The red solid curves represent the fit results and the blue dashed curves describe the nonpeaking background shapes on the M sig BC distribution. The pink, green and purple dashed curves show the signal, the ηX background and the peaking backgrounds, respectively.
FIG. 5. Projections of the 2D fits on the M sig BC distributions for the tag mode D → K 0 S π þ π − in individual phase-space bins. The top two rows are for the D → π þ π − π 0 signal decay and the bottom two rows for the D → K þ K − π 0 signal decay. The black dots with error bars are data. The red solid curves represent the fit results and the blue dashed curves describe the nonpeaking background shapes. The pink, green and purple dashed curves are the shapes of the signals, the backgrounds with correctly reconstructed signal mode but incorrectly reconstructed tag modes and the peaking backgrounds, respectively.
FIG. 6. Fits to the M 2 miss distributions for the ST mode D → K 0 L π þ π − in individual phase-space bins. The top two rows are for the D → π þ π − π 0 signal decay, and the bottom two rows for the D → K þ K − π 0 signal decay. The black dots with error bars are data. The red solid curves represent the fit results and the blue dashed curves describe the nonpeaking background shapes. The pink, green and purple dashed curves are the shapes of the signals, the ηπ þ π − backgrounds and the peaking backgrounds, respectively.
Measurements of the C P -even fractions of D 0 → π + π − π 0 and D 0 → K + K − π 0 at BESIII

January 2025

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1 Read

Physical Review D

The C P -even fractions ( F + ) of the decays D 0 → π + π − π 0 and D 0 → K + K − π 0 are measured with a quantum-correlated ψ ( 3770 ) → D D ¯ data sample collected by the BESIII experiment corresponding to an integrated luminosity of 7.93 fb − 1 . The results are F + π + π − π 0 = 0.9406 ± 0.0055 ± 0.0033 and F + K + K − π 0 = 0.631 ± 0.014 ± 0.011 , 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 2.6 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 C P violation in charm mixing. Published by the American Physical Society 2025


FIG. 1. The M (π + π − η) distribution for all four combinations within each event at √ s = 4.178 GeV. The black dots with error bars are data. The magenta solid line represents the fit result for signal extraction, the green dash-dotted line represents the f1(1285) shape, and the blue dashed line indicates the background shape. in an event in both the data and signal MC samples. M f1(1285) represents the known f 1 (1285) mass [32]. Figure 2 shows the comparison on M (π + π − ) from e + e − collision between data and the weighted signal MC at √ s = 4.178 GeV.
FIG. 2. The distribution of M (π + π − ) from e + e − collision at √ s = 4.178 GeV. The black dots with error bars are data, the histogram denotes the weighted distribution from signal MC sample.
FIG. 3. The line shape of the cross section of the process e + e − → f1(1285)π + π − described by a continuum process. The blue points are the measured central values of the dressed cross section, the blue bars represent the total statistical and systematic uncertainties, and the orange bars represent the statistical uncertainty.
Cross section measurement of e+ef1(1285)π+πe^{+}e^{-} \to f_{1}(1285)\pi^{+}\pi^{-} at center-of-mass energies between 3.808 and $4.951\rm GeV

Using data samples collected by the \mbox{BESIII} detector located at the Beijing Electron Positron Collider, the cross sections of the process e+ef1(1285)π+πe^+e^-\to f_{1}(1285)\pi^+\pi^- are measured at forty-five center-of-mass energies from 3.808 to 4.951GeV4.951 {\rm GeV}. An investigation on the cross section line shape is performed, and no significant structure is observed.


Search for lepton number violating decays of Ds+ {\textrm{D}}_{\textrm{s}}^{+} → h−h0e+e+

January 2025

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1 Read

Journal of High Energy Physics

A bstract Based on 7.33 fb − 1 of e ⁺ e − collision data collected by the BESIII detector operating at the BEPCII collider at center-of-mass energies from 4.128 to 4.226 GeV, a search for the Majorana neutrino ν m is conducted in the lepton-number-violating decays of Ds+ {D}_{\textrm{s}}^{+} D s + → h − h ⁰ e ⁺ e ⁺ . Here, h − represents a K − or π − , and h ⁰ represents a π ⁰ , KS0 {K}_S^0 K S 0 or ϕ . No significant signal is observed, and the upper limits of their branching fractions at the 90% confidence level are determined to be B \mathcal{B} B ( Ds+ {D}_{\textrm{s}}^{+} D s + → ϕπ − e ⁺ e ⁺ ) < 6 . 9 × 10 − 5 , B \mathcal{B} B ( Ds+ {D}_{\textrm{s}}^{+} D s + → ϕK − e ⁺ e ⁺ ) < 9 . 9 × 10 − 5 , B \mathcal{B} B ( Ds+ {D}_{\textrm{s}}^{+} D s + → KS0 {K}_S^0 K S 0 π − e ⁺ e ⁺ ) < 1 . 3 × 10 − 5 , B \mathcal{B} B ( Ds+ {D}_{\textrm{s}}^{+} D s + → KS0 {K}_S^0 K S 0 K − e ⁺ e ⁺ ) < 2 . 9 × 10 − 5 , B \mathcal{B} B ( Ds+ {D}_{\textrm{s}}^{+} D s + → π − π ⁰ e ⁺ e ⁺ ) < 2 . 9 × 10 − 5 and B \mathcal{B} B ( Ds+ {D}_{\textrm{s}}^{+} D s + → K − π ⁰ e ⁺ e ⁺ ) < 3 . 4 × 10 − 5 . The Majorana neutrino is searched for with different mass assumptions within the range [0 . 20 , 0 . 80] GeV /c ² in the decay of Ds+ {D}_{\textrm{s}}^{+} D s + → ϕe ⁺ ν m with ν m → π − e ⁺ , and the upper limits of the branching fractions at the 90% confidence level are at the level of 10 − 5 –10 − 2 , depending on the mass of the Majorana neutrino.


FIG. 4. Fit to the invariant mass distribution of π + π − e + e − . The dots with error bars represent the data, the red solid line is the MC signal shape, and the blue solid line is the total fit result. The blue dot-dash line (Background I) is the J/ψ → γη ′ , η ′ → π + π − η, η → γe + e − MC shape. The green long-dash line (Background II) is the J/ψ → γη, η → π + π − π 0 MC shape. The purple dashed line (Background III) is the J/ψ → γη, η → γπ + π − MC shape. The pink short-dash line (Background IV) is the J/ψ → γπ + π − π + π − MC shape.
FIG. 6. Fit to the distribution of plane angle φ for η → π + π − e + e − decay mode. The points with error bars represent the data, the blue solid histogram is the total fit result, and the red dashed line represents the function shape of F (φ) convolved with a Gaussian function. The light blue dashed histogram (Background I) is the J/ψ → γη ′ , η ′ → π + π − η, η → γe + e − MC shape. The green dashed histogram (Background II) is the J/ψ → γη, η → π + π − π 0 MC shape. The purple dashed histogram (Background III) is the J/ψ → γη, η → γπ + π − MC shape. The pink dotted histogram (Background IV) is the J/ψ → γπ + π − π + π − MC shape.
FIG. 7. Upper limits on the relative width at the 90% C.L. for different a masses.
FIG. 8. The branching fraction of η → π + π − e + e − from different theoretical predictions [1, 2] (blue squares), other experiments [4-6] (red triangles) and this measurement (green dot).
Study of $\eta\rightarrow\pi^+\pi^-l^+l^-

January 2025

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6 Reads

Using a sample of (10087±44)×106(10087\pm44)\times10^{6} J/ψJ/\psi events accumulated with the BESIII detector, we analyze the decays ηπ+πl+l\eta\rightarrow\pi^+\pi^-l^+l^- (l=e or μ\mu) via the process J/ψγηJ/\psi\rightarrow\gamma\eta. The branching fraction of ηπ+πe+e\eta\rightarrow\pi^+\pi^-e^+e^- is measured to be B(ηπ+πe+e)=(3.07±0.12stat.±0.19syst.)×104\mathcal{B}(\eta\rightarrow\pi^+\pi^-e^+e^-)=(3.07\pm0.12_{\rm{stat.}}\pm0.19_{\rm{syst.}}) \times10^{-4}. No signal events are observed for the ηπ+πμ+μ\eta\rightarrow\pi^{+}\pi^{-}\mu^{+}\mu^{-} decay, leading to an upper limit on the branching fraction of B(ηπ+πμ+μ)<4.0×107\mathcal{B}(\eta\rightarrow\pi^{+}\pi^{-}\mu^{+}\mu^{-})<4.0\times10^{-7} at the 90\% confidence level. Furthermore, the CP-violation asymmetry parameter is found to be ACP(ηπ+πe+e)=(4.04±4.69stat.±0.14syst.)%\mathcal{A}_{CP}(\eta\rightarrow\pi^{+}\pi^{-}e^{+}e^{-})=(-4.04\pm4.69_{\rm{stat.}}\pm0.14_{\rm{syst.}})\%, showing no evidence of CP-violation with current statistics. Additionally, we extract the transition form factor from the decay amplitude of ηπ+πe+e\eta\rightarrow\pi^+\pi^-e^+e^-. Finally, axion-like particles are searched for via the decay ηπ+πa,ae+e\eta\rightarrow\pi^+\pi^-a, a\rightarrow e^+e^-, and upper limits on this branching fraction relative to that of ηπ+πe+e\eta\rightarrow\pi^+\pi^-e^+e^- are presented as a function of the axion-like particle mass in the range 5200 MeV/c25-200\ \mathrm{MeV}/c^{2}.


Observation of Λ c + → Λ a 0 ( 980 ) + and Evidence for Σ ( 1380 ) + in Λ c + → Λ π + η

January 2025

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3 Reads

Physical Review Letters

Based on 6.1 fb − 1 of e + e − annihilation data collected at center-of-mass energies from 4.600 to 4.843 GeV with the BESIII detector at the BEPCII collider, a partial wave analysis of Λ c + → Λ π + η is performed, and branching fractions and decay asymmetry parameters of intermediate processes are determined. The process Λ c + → Λ a 0 ( 980 ) + is observed for the first time, and evidence for the pentaquark candidate Σ ( 1380 ) + decaying into Λ π + is found with statistical significance larger than 3 σ with mass and width fixed to theoretical predictions. The branching fraction product B [ Λ c + → Λ a 0 ( 980 ) + ] B [ a 0 ( 980 ) + → π + η ] is determined to be ( 1.05 ± 0.1 6 stat ± 0.0 5 syst ± 0.0 7 ext ) % , which is larger than theoretical calculations by 1–2 orders of magnitude. Here the third (external) systematic is from B ( Λ c + → Λ π + η ) . Finally, we precisely obtain the absolute branching fraction B ( Λ c + → Λ π + η ) = ( 1.94 ± 0.0 7 stat ± 0.1 1 syst ) % . Published by the American Physical Society 2025


Figure 2. Fits to the M BC distributions of the ST D − candidates. The dots with error bars are data. The blue solid curves are the fit results. The red dashed curves are the fitted combinatorial backgrounds. The green hatched histograms are background events from the inclusive MC sample.
Measurement of the branching fraction of D+ → τ+ντ

January 2025

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5 Reads

Journal of High Energy Physics

A bstract By analyzing e ⁺ e − collision data with an integrated luminosity of 7.9 fb − 1 collected with the BESIII detector at the center-of-mass energy of 3.773 GeV, the branching fraction of D ⁺ → τ ⁺ ν τ is determined as B \mathcal{B} B = (9.9 ± 1.1 stat ± 0.5 syst ) × 10 − 4 . Using the most precise result B \mathcal{B} B ( D ⁺ → μ ⁺ ν μ ) = (3.981 ± 0.079 stat ± 0.040 syst ) × 10 − 4 [1], we determine R τ/μ = Γ( D ⁺ → τ ⁺ ν τ )/Γ( D ⁺ → μ ⁺ ν μ ) = 2.49 ± 0.31, achieving a factor of two improvement in precision compared to the previous BESIII result. This measurement is in agreement with the standard model prediction of lepton flavor universality within one standard deviation.


Citations (8)


... At present essential experimental progress has been achieved in studding exclusive semileptonic decays of charmed mesons [1]. Many semileptonic decay channels both of the D and D s mesons to the ground states of strange and light mesons were precisely measured by the BESIII Collaboration [2][3][4][5][6][7][8][9][10][11]. These studies allowed not only to determine the semileptonic decay branching fractions but also to evaluate some of the decay form factors at the zero recoil point of the final meson q 2 = 0 [3,5,[7][8][9][10][11] and the forward-backward asymmetries [5]. ...

Reference:

Exclusive semileptonic decays of $D$ and $D_s$ mesons into orbitally and radially excited states of strange and light mesons
Observation of D + → f 0 ( 500 ) μ + ν μ and study of D + → π + π − ℓ + ν ℓ decay dynamics

Physical Review D

... Numerous outstanding models have been developed for nucleic acid sequences, including Evo 10 and DNABERT 11 for DNA Uni-RNA 12 and RiNALMo 13 for RNA. Existing research either included epigenetic information only during fine-tuning stage 14 or directly into pre-training but in the form of reduction to beta values 15,16 , which ignores the vast information hidden in a single biological sample. There is an urgent need to fill this gap towards a foundation model that directly incorporates epigenetic information from BS-seq data during the pre-training phase. ...

MethylGPT: a foundation model for the DNA methylome

... The dataset adheres to the FLARE2022 standards, ensuring high-quality annotations and consistency across cases. Its comprehensive coverage of abdominal anatomy makes it an essential resource for evaluating pre-trained segmentation models on multi-organ segmentation tasks [27]. ...

Unleashing the strengths of unlabelled data in deep learning-assisted pan-cancer abdominal organ quantification: the FLARE22 challenge
  • Citing Article
  • November 2024

The Lancet Digital Health

... The lesion and organ segmentation model employed in this study was developed using a training dataset derived from the 2024 AutoPet Challenge [22]. This dataset included patients with a history of malignant melanoma, lymphoma, lung cancer, and a negative control group. ...

Results from the autoPET challenge on fully automated lesion segmentation in oncologic PET/CT imaging

Nature Machine Intelligence

... In the past two decades, the BESIII Collaboration has reported lots of studies on the near-threshold enhancements in the baryon-antibaryon invariant mass distributions [2][3][4][5][6][7], which mainly focused on the pp and ΛΛ thresholds. Meanwhile, some structures like Xð1835Þ=Xð1840Þ and Xð1880Þ near pp threshold were also observed in the η 0 π þ π − or 3ðπ þ π − Þ mass spectrum [8,9]. ...

Measurement of the branching fraction of the decay J / ψ → p p ¯ η

Physical Review D

... 151 Researchers have used generative AI to predict protein structure, 152-154 quantify protein pathogenicity, 155 model structures and interactions of DNA and RNA molecules, 156 and predict gene mutations. 157 Studies on predicting epigenomic signals [158][159][160] and allele-specific activity based only on local nucleotide-sequence context, 159 as well as characterization of the transcriptional control by histone modifications in gene regulation 161 and modulating gene expression for precision gene therapy, 162 have been published. Antibody optimization processes can also be made more efficient with generative AI methods, improving diversity 163 and affinity. ...

CpGPT: a Foundation Model for DNA Methylation

... For the χ c1;2 signals, the parameters of this Gaussian function are determined by fitting the mass spectrum of K þ K − η 0 in data, while for the η c ð2SÞ signal, due to limited statistics, they are fixed to the values extrapolated from χ c1;2 . Assuming the δm and δσ follow linear relationships along m [9,31], the parameters δm and δσ for η c ð2SÞ are δm ¼ ð0.12 AE 0.18Þ MeV=c 2 and δσ ¼ ð−0.87 AE 1.87Þ MeV=c 2 for the η 0 → π þ π − γ mode, δm ¼ ð−6.52 AE 2.73Þ MeV=c 2 and δσ ¼ ð5.39 AE 5.06Þ MeV=c 2 for the η 0 → π þ π − η mode. The mass and width of χ c1;2 determined from the fit are consistent with the results from PDG. ...

Search for η c ( 2 S ) → 2 ( π + π − ) and improved measurement of χ c J → 2 ( π + π − )

Physical Review D