Y. Schelhaas

activity

20182026

most citedObservation of an isoscalar resonance with exotic

J^{P C} = 1^{-+}

quantum numbers in

J / ψ \to γ η η^{'}

84 citations · 3.2k across the 404 of their papers we have counts for

collaborators

417 papers

hep-ex2026

Search for the charged lepton flavour violating decay $η^{'} \to e μ$

BESIII Collaboration, M. Ablikim, M. N. Achasov +765

Based on $(8998 \pm 40) \times 1 0^{6}$ $J / ψ$ events collected in $e^{+} e^{-}$ collisions at $s = 3.097$ GeV with the BESIII detector, we present a search for the charged lepton flavou…

hep-ex2026

Study of the $e^{+} e^{-} \to π^{+} π^{-} D_{s}^{+} D_{s}^{-}$ process from $s$ = 4.42 to 4.95 GeV at BESIII

BESIII Collaboration, M. Ablikim, M. N. Achasov +782

Based on $8.5 fb^{- 1}$ of $e^{+} e^{-}$ collision data collected at center-of-mass energies between 4.42 and 4.95 GeV with the BESIII detector at the BEPCII storage ring, we inves…

hep-ex2025

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 $…

hep-ex2025★ 2 cited

Search for a hypothetical gauge boson and dark photons in charmonium transitions

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

We report a direct search for a new gauge boson, $X$ , with a mass of $17 MeV / c^{2}$ , which could explain the anomalous excess of $e^{+} e^{-}$ pairs observed in the $^{8} Be$ n…

hep-ex2025★ 1 cited

Study of the Magnetic Dipole Transition of $J / ψ \to γ η_{c}$ via $η_{c} \to p p ˉ$

BESIII Collaboration, M. Ablikim, M. N. Achasov +692

Using $(10.087 \pm 0.044) \times 1 0^{9}$ $J / ψ$ events collected with the BESIII detector at the $e^{+} e^{-}$ BEPCII collider, we present the first amplitude analysis of $J / ψ \to γ p p ˉ$ wit…

hep-ex2025

First measurements of the branching fractions of $J / ψ \to Ξ^{0} Λ ˉ K_{S}^{0} + c . c .$ , $J / ψ \to Ξ^{0} Σ ˉ^{0} K_{S}^{0} + c . c .$ , and $J / ψ \to Ξ^{0} Σ ˉ^{-} K^{+} + c . c .$

BESIII Collaboration, M. Ablikim, M. N. Achasov +686

By analyzing $(10087 \pm 44) \times 1 0^{6}$ $J / ψ$ events collected with the BESIII detector at the BEPCII, the decays $J / ψ \to Ξ^{0} Λ ˉ K_{S}^{0} + c . c .$ , $J / ψ \to Ξ^{0} Σ ˉ^{0} K_{S}^{0} + c . c .$ , and $…

hep-ex2025

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…

hep-ex2025

First Observation of $Λ$ Hyperon Transverse Polarization in $ψ (3686) \to Λ Λ ˉ$

BESIII Collaboration, M. Ablikim, M. N. Achasov +687

Based on $(448.1 \pm 2.9) \times 1 0^{6}$ $ψ (3686)$ events collected with the BESIII detector at the BEPCII collider, we present the first observation of spin transverse polarization of…

hep-ex2025★ 1 cited

Exploring baryon semi-leptonic decays through polarization and entanglement

BESIII Collaboration, M. Ablikim, M. N. Achasov +697

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 e…

hep-ex2025

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…

hep-ex2025

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…

hep-ex2025

Observation of $ψ (3686) \to γ η (1405)$ via $η (1405) \to f_{0} (980) π^{0}$

M. Ablikim, M. N. Achasov, P. Adlarson +694

The decay $ψ (3686) \to γ π^{+} π^{-} π^{0}$ is studied using a sample of $(2712.4 \pm 14.3) \times 1 0^{6}$ $ψ (3686)$ events collected with the BESIII detector. The decay $η (1405) \to π^{+} π^{-} π^{0}$ is ob…

hep-ex2025

Measurement of the branching fraction of $\psip \to ωηη$

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

Using a sample of (2.712 $\pm$ 0.014) $\times 1 0^{9}$ $\psip$ events collected with the BESIII detector at the BEPCII collider in 2009, 2012, and 2021, the decay $\psip \to ωηη$ is…

hep-ex2025

Study of the $χ_{c J} \to Λ Λ ˉ η^{'}$ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +683

Using a data sample of $(2.712 \pm 0.014) \times 1 0^{9}$ $ψ (3686)$ events collected with the BESIII detector at the BEPCII collider, we investigate the decays $χ_{cJ} \rightarrow Λ\bar…

hep-ex2025

Search for $χ_{c 1} \to π^{+} π^{-} η_{c}$ via $ψ (3686) \to γ χ_{c 1}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +688

Utilizing $(2712.4 \pm 14.3) \times 1 0^{6}$ $ψ (3686)$ events collected with the BESIII detector at the BEPCII collider, we search for the hadronic transition process $χ_{c1} \to π^+π…

hep-ex2025

Search for a bound state of $Λ_{c} Σ ˉ_{c}$ near threshold

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

We search for a possible $Λ_{c} Σ ˉ_{c}$ bound state, denoted as $H_{c}^{\pm}$ , via the $e^{+} e^{-} \to π^{+} π^{-} Λ_{c}^{+} Λ ˉ_{c}^{-}$ process for the first time. This an…

hep-ex2025

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…

hep-ex2025

Search for the lepton number violating process $J / ψ \to K^{+} K^{+} e^{-} e^{-} + c . c .$

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

Based on $(10087 \pm 44) \times 1 0^{6}$ $J / ψ$ events collected with the BESIII detector, we search for the lepton number violating decay $J / ψ \to K^{+} K^{+} e^{-} e^{-} + c . c .$ for the first tim…

hep-ex2025

Precise Measurement of Chromoelectric Dipole Moment of the Charm Quark

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

The combined symmetry of charge conjugation and parity ( $C P$ ) is tested in the hadronic transition $ψ (3686) \to π^{+} π^{-} J / ψ$ , using a dataset of $(2712.4 \pm 14.3) \times 1 0^{6}$ $ψ(3686…

hep-ex2025

Search for the charged lepton flavor violating decay $ψ (3686) \to e^{\pm} μ^{\mp}$

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

By analyzing $(2367.0 \pm 11.1) \times 1 0^{6}$ $ψ (3686)$ events collected in $e^{+} e^{-}$ collisions at $s = 3.686 GeV$ with the BESIII detector at the BEPCII collider, we report th…

hep-ex2025

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^…

hep-ex2025★ 1 cited

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…

Search for the charged lepton flavour violating decay η′→eμ

Study of the e+e−→π+π−Ds+​Ds−​ process from s​ = 4.42 to 4.95 GeV at BESIII

First Measurement of the Ds+​→K0μ+νμ​ Decay

Search for a hypothetical gauge boson and dark photons in charmonium transitions

Study of the Magnetic Dipole Transition of J/ψ→γηc​ via ηc​→ppˉ​

First measurements of the branching fractions of J/ψ→Ξ0ΛˉKS0​+c.c., J/ψ→Ξ0Σˉ0KS0​+c.c., and J/ψ→Ξ0Σˉ−K++c.c.

Search for the lepton number violating decay η→π+π+e−e−+c.c. via J/ψ→ϕη

First Observation of Λ Hyperon Transverse Polarization in ψ(3686)→ΛΛˉ

Exploring baryon semi-leptonic decays through polarization and entanglement

Measurement of the space-like π0 transition form factor

Search for the electromagnetic Dalitz decays χcJ​→e+e−ϕ

Observation of ψ(3686)→γη(1405) via η(1405)→f0​(980)π0

Measurement of the branching fraction of $\psip \to ωηη$

Study of the χcJ​→ΛΛˉη′ decays

Search for χc1​→π+π−ηc​ via ψ(3686)→γχc1​

Search for a bound state of Λc​Σˉc​ near threshold

Production and Decay Dynamics of the Charmed Baryon Λc+​ in e+e− Annihilations near Threshold

Measurement of the Born cross section for e+e−→pK−K−Ξˉ+ at s​= 3.5-4.9 GeV

Measurement of the branching fractions of the Cabibbo-favored decays Λc+​→ΛKS0​K+ and Λc+​→Ξ0KS0​π+ and search for Λc+​→Σ0KS0​K+

Search for the lepton number violating process J/ψ→K+K+e−e−+c.c.

Precise Measurement of Chromoelectric Dipole Moment of the Charm Quark

Search for the charged lepton flavor violating decay ψ(3686)→e±μ∓

Measurement of the η transition form factor through η′→π+π−η decay

A novel measurement of the strong-phase difference between D0→K−π+ and Dˉ0→K−π+ decays using C-even and C-odd quantum-correlated DDˉ pairs

Search for the charged lepton flavour violating decay $η^{'} \to e μ$

Study of the $e^{+} e^{-} \to π^{+} π^{-} D_{s}^{+} D_{s}^{-}$ process from $s$ = 4.42 to 4.95 GeV at BESIII

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

Study of the Magnetic Dipole Transition of $J / ψ \to γ η_{c}$ via $η_{c} \to p p ˉ$

First measurements of the branching fractions of $J / ψ \to Ξ^{0} Λ ˉ K_{S}^{0} + c . c .$ , $J / ψ \to Ξ^{0} Σ ˉ^{0} K_{S}^{0} + c . c .$ , and $J / ψ \to Ξ^{0} Σ ˉ^{-} K^{+} + c . c .$

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

First Observation of $Λ$ Hyperon Transverse Polarization in $ψ (3686) \to Λ Λ ˉ$

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

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

Observation of $ψ (3686) \to γ η (1405)$ via $η (1405) \to f_{0} (980) π^{0}$

Study of the $χ_{c J} \to Λ Λ ˉ η^{'}$ decays

Search for $χ_{c 1} \to π^{+} π^{-} η_{c}$ via $ψ (3686) \to γ χ_{c 1}$

Search for a bound state of $Λ_{c} Σ ˉ_{c}$ near threshold

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

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

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 $Λ_{c}^{+} \to Σ^{0} K_{S}^{0} K^{+}$

Search for the lepton number violating process $J / ψ \to K^{+} K^{+} e^{-} e^{-} + c . c .$

Search for the charged lepton flavor violating decay $ψ (3686) \to e^{\pm} μ^{\mp}$

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

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