X. Shi

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

BESIII Collaboration, M. Ablikim, M. N. Achasov +774

We present the first search for the doubly Cabibbo-suppressed decays $D^{0} \to K^{+} π^{-} η^{'}$ and $D^{+} \to K^{+} π^{0} η^{'}$ using an $e^{+} e^{-}$ collision data sample corresponding to an…

Search for the lepton-flavor-violating decay $τ^{\pm} \to μ^{\pm} γ$ at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +466

We present a search for the lepton-flavor-violating decay $τ^{\pm} \to μ^{\pm} γ$ using a data sample that corresponds to an integrated luminosity of 428 fb $^{- 1}$ recorded by the Bel…

Search for axion-like particles decaying to two photons at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +450

Axion-like particles (ALPs) are predicted in many extensions of the Standard Model and provide a well-motivated portal between visible and hidden sectors through their coupling to…

Observation of the decays $B^{+} \to Σ_{c} (2455)^{++} Ξ ˉ_{c}^{' -}$ and $B^{0} \to Σ_{c} (2455)^{0} Ξ ˉ_{c}^{'0}$

Belle, Belle II Collaborations, : +403

We report the first observation of the decays $B^{+} \to Σ_{c} (2455)^{++} Ξ ˉ_{c}^{' -}$ and $B^{0} \to Σ_{c} (2455)^{0} Ξ ˉ_{c}^{'0}$ , with significances of $6.4 σ$ a…

Measurement of inclusive $B \to X_{u} ℓ ν$ partial branching fractions and $∣ V_{u b} ∣$ at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +419

A sample of 365 fb $^{- 1}$ of $e^{+} e^{-} \to Υ (4 S) \to B B ˉ$ data collected by the Belle II experiment is used to measure the partial branching fractions of charmless semileptonic…

Measurements of the mass difference $m (B^{0}) - m (B^{+})$ and the energy dependence of the cross-section ratio $σ (e^{+} e^{-} \to B^{0} B ˉ^{0}) / σ (e^{+} e^{-} \to B^{+} B^{-})$ at Belle and Belle II

Belle, Belle II Collaborations, : +396

Using data samples collected by the Belle and Belle II experiments at the $Υ (4 S)$ resonance with integrated luminosities of 571 fb $^{- 1}$ and 365 fb $^{- 1}$ , respectively, we measur…

Search for the charmonium weak decay $J / ψ \to D ˉ^{0} K ˉ^{* 0} + c.c.$

BESIII Collaboration, M. Ablikim, M. N. Achasov +699

Based on a sample of $(10087 \pm 44) \times 1 0^{6}$ $J / ψ$ events collected at the center-of-mass energy $s$ = 3.0969 GeV with the BESIII detector, we search for the charmonium rar…

First search for $B \to X_{s} ν ν ˉ$ decays

Belle II Collaboration, M. Abumusabh, I. Adachi +440

We report the first search for the flavor-changing neutral-current decays $B \to X_{s} ν ν ˉ$ , where $X_{s}$ is a hadronic system with strangeness equal to 1, in data coll…

First Measurement of the $D_{s}^{+} \to K^{0} μ^{+} ν_{μ}$ Decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +693

We report the first measurement of the semileptonic decay $D_{s}^{+} \to K^{0} μ^{+} ν_{μ}$ , using a sample of $e^{+} e^{-}$ annihilation data corresponding to an integrated luminosity of $…

Precision Measurement of $D_{s}^{*+}$ - $D_{s}^{+}$ Mass Difference

BESIII Collaboration, M. Ablikim, M. N. Achasov +684

We measure the mass difference between $D_{s}^{*+}$ and $D_{s}^{+}$ , $Δ m_{s}$ , using the decay chain $D_{s}^{*+} \to D_{s}^{+} (\to K^{+} K^{-} π^{+}) π^{0}$ , utilizing $e^{+} e^{-}$ annihi…

Search for the lepton number violating decay $η \to π^{+} π^{+} e^{-} e^{-} + c . c .$ via $J / ψ \to ϕ η$

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

Based on a sample of $(10.087 \pm 0.044) \times 1 0^{9} J / ψ$ events collected by the BESIII detector at the BEPCII collider, we perform the first search for the lepton number violati…

Measurement of the space-like $π^{0}$ transition form factor

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

Based on $2.93 fb^{- 1}$ of $e^{+} e^{-}$ collision data taken with the BESIII detector at a center-of-mass energy of $3.773 GeV$ , the two-photon fusion process $e^+e^-\t…

Search for the electromagnetic Dalitz decays $χ_{c J} \to e^{+} e^{-} ϕ$

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

Using a data sample of $(2.712 \pm 0.014) \times 1 0^{9}$ $ψ (3686)$ events collected at $s = 3.686$ GeV by the BESIII detector, we search for the rare electromagnetic Dalitz deca…

Observation of $e^{+} e^{-} \to η Υ (2 S)$ and search for $e^{+} e^{-} \to η Υ (1 S), γ X_{b}$ at $s$ near 10.75 GeV

Belle II Collaboration, I. Adachi, L. Aggarwal +435

We present an analysis of the processes $e^{+} e^{-} \to η Υ (1 S)$ , $η Υ (2 S)$ , and $γ X_{b}$ with $X_{b} \to π^{+} π^{-} χ_{b J}, χ_{b J} \to γ Υ (1 S)$ $(J = 1, 2)$ reconstructed from $γγπ^+π^-\ell^+\ell^-~(…

Search for $e^{+} e^{-} \to γ χ_{b J}$ ( $J$ = 0, 1, 2) near $s = 10.746$ GeV at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +399

We search for the $e^{+} e^{-} \to γ χ_{b J}$ ( $J$ = 0, 1, 2) processes at center-of-mass energies $s$ = 10.653, 10.701, 10.746, and 10.804 GeV. These data were collected with the…

Production and Decay Dynamics of the Charmed Baryon $Λ_{c}^{+}$ in $e^{+} e^{-}$ Annihilations near Threshold

BESIII Collaboration, M. Ablikim, M. N. Achasov +700

The study of the charmed baryons is crucial for investigating the strong and weak interactions in the standard model and for gaining insights into the internal structure of baryons…

hep-ex2025★ 2 cited

Measurement of the Born cross section for $e^{+} e^{-} \to p K^{-} K^{-} Ξ ˉ^{+}$ at $s =$ 3.5-4.9 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +695

Using $e^{+} e^{-}$ collision data corresponding to a total integrated luminosity of 20 $fb^{- 1}$ collected with the BESIII detector at the BEPCII collider, we present a measurem…

hep-ex2025★ 2 cited

Measurement of the branching fractions of the Cabibbo-favored decays $Λ_{c}^{+} \to Λ K_{S}^{0} K^{+}$ and $Λ_{c}^{+} \to Ξ^{0} K_{S}^{0} π^{+}$ and search for $Λ_{c}^{+} \to Σ^{0} K_{S}^{0} K^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +664

Based on $e^{+} e^{-}$ collision data corresponding to an integrated luminosity of about 4.5 fb $^{- 1}$ collected at center-of-mass energies between 4599.53 MeV and 4698.82 MeV with…

Search for the lepton-flavor-violating $τ^{-} \to e^{\mp} ℓ^{\pm} ℓ^{\mp}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +447

We present the result of a search for the charged-lepton-flavor violating decays $τ^{-} \to e^{\mp} ℓ^{\pm} ℓ^{-}$ , where $ℓ$ is a muon or an electron, using a data sample…

hep-ex2025★ 3 cited

Observation of the decays $B^{+} \to Σ_{c} (2455)^{++} Ξ_{c}^{-}$ and $B^{0} \to Σ_{c} (2455)^{0} Ξ_{c}^{0}$

Belle, Belle II Collaborations, : +386

We report the first observation of the two-body baryonic decays $B^{+} \to Σ_{c} (2455)^{++} Ξ_{c}^{-}$ and $B^{0} \to Σ_{c} (2455)^{0} Ξ_{c}^{0}$ with significance…

Measurement of the $D^{0} \to K^{-} π^{+} e^{+} e^{-}$ branching fraction and search for $D^{0} \to π^{+} π^{-} e^{+} e^{-}$ and $D^{0} \to K^{+} K^{-} e^{+} e^{-}$ decays at Belle

Belle, Belle II Collaborations, : +481

We present a study of the rare charm meson decays $D^{0} \to K^{+} K^{-} e^{+} e^{-}$ , $π^{+} π^{-} e^{+} e^{-}$ , and $K^{-} π^{+} e^{+} e^{-}$ using a 942 fb $^{- 1}$ data set c…

Measurement of the $η$ transition form factor through $η^{'} \to π^{+} π^{-} η$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +678

Based on a sample of $(1.0087 \pm 0.0044) \times 1 0^{10}$ $J / ψ$ events collected at BESIII, the transition form factor of the $η$ meson is extracted by analyzing $J/ψ\toγη',~η'\toπ^+π^…

A novel measurement of the strong-phase difference between $D^{0} \to K^{-} π^{+}$ and $D ˉ^{0} \to K^{-} π^{+}$ decays using $C$ -even and $C$ -odd quantum-correlated $D D ˉ$ pairs

BESIII Collaboration, M. Ablikim, M. N. Achasov +698

A novel measurement technique of strong-phase differences between the decay amplitudes of $D^{0}$ and $D ˉ^{0}$ mesons is introduced which exploits quantum-correlated $D D ˉ$ pa…