K. Amos

activity

20232026

most citedObservation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector

108 citations · 651 across the 61 of their papers we have counts for

collaborators

63 papers

hep-ex2026

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…

physics.ins-det2025

Radiation damage study of Belle II silicon strip sensors with 90 MeV electron irradiation

K. Adamczyk, H. Aihara, K. Amos +58

The silicon strip sensors of the Belle II silicon vertex detector were irradiated with 90 MeV electron beams up to an equivalent 1-MeV-neutron fluence of $3.0\times 10^{13}~{\rm n}…

hep-ex2025

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^-~(…

hep-ex2025

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…

hep-ex2025★ 1 cited

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…

hep-ex2025★ 1 cited

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…

hep-ex2025★ 1 cited

Search for an Axion-Like Particle in $B \to K^{(*)} a (\to γ γ)$ Decays at Belle

Belle, Belle II Collaborations, : +422

We report a search for an axion-like particle $a$ in $B \to K^{(*)} a (\to γ γ)$ decays using data collected with the Belle detector at the KEKB asymmetric energy elec…

hep-ex2025★ 2 cited

Measurement of the CP asymmetry in $D^{+} \to π^{+} π^{0}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +402

We measure the CP asymmetry in $D^{+} \to π^{+} π^{0}$ decays reconstructed in $e^{+} e^{-}$ collisions at the Belle II experiment using a data set corresponding to an integrated luminosity…

hep-ex2025

Charged-hadron identification at Belle II

Belle II Collaboration, I. Adachi, H. Ahmed +408

The Belle II experiment's ability to identify particles critically affects the sensitivity of its measurements. We describe Belle II's algorithms for identifying charged particles…

hep-ex2025★ 4 cited

Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment

Belle II Collaboration, I. Adachi, L. Aggarwal +437

Inelastic dark matter models that have two dark matter particles and a massive dark photon can reproduce the observed relic dark matter density without violating cosmological limit…

hep-ex2025

Search for lepton flavor-violating decay modes $B^{0} \to K^{* 0} τ^{\pm} ℓ^{\mp}$ ( $ℓ = e, μ$ ) with hadronic B-tagging at Belle and Belle II

Belle, Belle II Collaborations, : +375

We present the results of a search for the charged-lepton-flavor violating decays $B^{0} \to K^{* 0} τ^{\pm} ℓ^{\mp}$ , where $ℓ^{\mp}$ is either an electron or a muon. The…

hep-ex2025

Observation of double parton scattering in same-sign W boson pair production in pp collisions at $s = 13$ TeV with the ATLAS detector

ATLAS Collaboration

This letter reports the measurement of double parton scattering in same-sign W boson pair production with the ATLAS detector. The data set used corresponds to an integrated luminos…

hep-ex2025★ 1 cited

Search for lepton-flavor-violating $τ^{-} \to ℓ^{-} K_{s}^{0}$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +419

We present the results of a search for charged-lepton-flavor violating decays $τ^{-} \to ℓ^{-} K_{S}^{0}$ , where $ℓ^{-}$ is either an electron or a muon. We combine $e…

hep-ex2025★ 5 cited

Test of lepton flavor universality with measurements of $R (D^{+})$ and $R (D^{*+})$ using semileptonic $B$ tagging at the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +450

We report measurements of the ratios of branching fractions ${\cal R}(D^{(*)+}) = \frac{{\cal B}(\overline{B}{}^0 \to D^{(*)+} \,τ^- \, \overlineν_τ)}{{\cal B}(\overline{B}{}^0 \to…

hep-ex2024★ 7 cited

Expected Tracking Performance of the ATLAS Inner Tracker at the High-Luminosity LHC

ATLAS Collaboration

The high-luminosity phase of LHC operations (HL-LHC), will feature a large increase in simultaneous proton-proton interactions per bunch crossing up to 200, compared with a typical…

hep-ex2024★ 1 cited

Search for supersymmetry in final states with missing transverse momentum and charm-tagged jets using 139 fb $^{- 1}$ of proton-proton collisions at $s =$ 13 TeV with the ATLAS detector

ATLAS Collaboration

The paper presents a search for supersymmetric particles produced in proton-proton collisions at $s =$ 13 TeV and decaying into final states with missing transverse momentum…

hep-ex2024★ 1 cited

Search for a new scalar decaying into new spin-1 bosons in four-lepton final states with the ATLAS detector

ATLAS Collaboration

A search is conducted for a new scalar boson $S$ , with a mass distinct from that of the Higgs boson, decaying into four leptons ( $ℓ =$ $e$ , $μ$ ) via an intermediate state contai…

hep-ex2024

Search for a light CP-odd Higgs boson decaying into a pair of $τ$ -leptons in proton-proton collisions at $s = 13$ TeV with the ATLAS detector

ATLAS Collaboration

This paper reports a search for a light CP-odd scalar resonance with a mass of 20 GeV to 90 GeV in 13 TeV proton-proton collision data with an integrated luminosity of 140 fb$^{-1}…

hep-ex2024★ 3 cited

Combination of searches for singly produced vector-like top quarks in pp collisions at $s = 13$ TeV with the ATLAS detector

ATLAS Collaboration

A combination of searches for the single production of vector-like top quarks ( $T$ ) is presented. These analyses are based on proton $-$ proton collisions at $s = 13$ TeV record…

hep-ex2024★ 6 cited

Measurement of single top-quark production in association with a $W$ boson in $pp$ collisions at $s = 13$ TeV with the ATLAS detector

The ATLAS Collaboration

The inclusive cross-section for the production of a single top quark in association with a $W$ boson is measured using 140 fb $^{- 1}$ of proton-proton collision data collected with…

hep-ex2024★ 3 cited

Search for the associated production of charm quarks and a Higgs boson decaying into a photon pair with the ATLAS detector

ATLAS Collaboration

A search for the production of a Higgs boson and one or more charm quarks, in which the Higgs boson decays into a photon pair, is presented. This search uses proton-proton collisio…

hep-ex2024★ 5 cited

Constraint on the total width of the Higgs boson from Higgs boson and four-top-quark measurements in $pp$ collisions at $s$ = 13 TeV with the ATLAS detector

ATLAS Collaboration

This Letter presents a constraint on the total width of the Higgs boson ( $Γ_{H}$ ) using a combined measurement of on-shell Higgs boson production and the production of four top quark…

hep-ex2024★ 3 cited

Combination of searches for Higgs boson decays into a photon and a massless dark photon using $pp$ collisions at $s = 13$ TeV with the ATLAS detector

ATLAS Collaboration

A combination of searches for Higgs boson decaying into a visible photon and a massless dark photon ( $H \to γ γ_{d}$ ) is presented using 139 fb $^{- 1}$ of proton--proton collisi…

Observation of the decays B+→Σc​(2455)++Ξˉc′−​ and B0→Σc​(2455)0Ξˉc′0​

Radiation damage study of Belle II silicon strip sensors with 90 MeV electron irradiation

Observation of e+e−→ηΥ(2S) and search for e+e−→ηΥ(1S), γXb​ at s​ near 10.75 GeV

Search for e+e−→γχbJ​ (J = 0, 1, 2) near s​=10.746 GeV at Belle II

Search for the lepton-flavor-violating τ−→e∓ℓ±ℓ∓ decays at Belle II

Observation of the decays B+→Σc​(2455)++Ξc−​ and B0→Σc​(2455)0Ξc0​

Measurement of the D0→K−π+e+e− branching fraction and search for D0→π+π−e+e− and D0→K+K−e+e− decays at Belle

Search for an Axion-Like Particle in B→K(∗)a(→γγ) Decays at Belle

Measurement of the CP asymmetry in D+→π+π0 decays at Belle II

Charged-hadron identification at Belle II

Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment

Search for lepton flavor-violating decay modes B0→K∗0τ±ℓ∓ (ℓ=e,μ) with hadronic B-tagging at Belle and Belle II

Observation of double parton scattering in same-sign W boson pair production in pp collisions at s​=13 TeV with the ATLAS detector

Search for lepton-flavor-violating τ−→ℓ−Ks0​ decays at Belle and Belle II

Test of lepton flavor universality with measurements of R(D+) and R(D∗+) using semileptonic B tagging at the Belle II experiment

Expected Tracking Performance of the ATLAS Inner Tracker at the High-Luminosity LHC

Search for supersymmetry in final states with missing transverse momentum and charm-tagged jets using 139 fb−1 of proton-proton collisions at s​= 13 TeV with the ATLAS detector

Search for a new scalar decaying into new spin-1 bosons in four-lepton final states with the ATLAS detector

Search for a light CP-odd Higgs boson decaying into a pair of τ-leptons in proton-proton collisions at s​=13 TeV with the ATLAS detector

Combination of searches for singly produced vector-like top quarks in pp collisions at s​=13 TeV with the ATLAS detector

Measurement of single top-quark production in association with a W boson in pp collisions at s​=13 TeV with the ATLAS detector

Search for the associated production of charm quarks and a Higgs boson decaying into a photon pair with the ATLAS detector

Constraint on the total width of the Higgs boson from Higgs boson and four-top-quark measurements in pp collisions at s​ = 13 TeV with the ATLAS detector

Combination of searches for Higgs boson decays into a photon and a massless dark photon using pp collisions at s​=13 TeV with the ATLAS detector

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

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

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

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

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

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

Search for an Axion-Like Particle in $B \to K^{(*)} a (\to γ γ)$ Decays at Belle

Measurement of the CP asymmetry in $D^{+} \to π^{+} π^{0}$ decays at Belle II

Search for lepton flavor-violating decay modes $B^{0} \to K^{* 0} τ^{\pm} ℓ^{\mp}$ ( $ℓ = e, μ$ ) with hadronic B-tagging at Belle and Belle II

Observation of double parton scattering in same-sign W boson pair production in pp collisions at $s = 13$ TeV with the ATLAS detector

Search for lepton-flavor-violating $τ^{-} \to ℓ^{-} K_{s}^{0}$ decays at Belle and Belle II

Test of lepton flavor universality with measurements of $R (D^{+})$ and $R (D^{*+})$ using semileptonic $B$ tagging at the Belle II experiment

Search for supersymmetry in final states with missing transverse momentum and charm-tagged jets using 139 fb $^{- 1}$ of proton-proton collisions at $s =$ 13 TeV with the ATLAS detector

Search for a light CP-odd Higgs boson decaying into a pair of $τ$ -leptons in proton-proton collisions at $s = 13$ TeV with the ATLAS detector

Combination of searches for singly produced vector-like top quarks in pp collisions at $s = 13$ TeV with the ATLAS detector

Measurement of single top-quark production in association with a $W$ boson in $pp$ collisions at $s = 13$ TeV with the ATLAS detector

Constraint on the total width of the Higgs boson from Higgs boson and four-top-quark measurements in $pp$ collisions at $s$ = 13 TeV with the ATLAS detector

Combination of searches for Higgs boson decays into a photon and a massless dark photon using $pp$ collisions at $s = 13$ TeV with the ATLAS detector