M. Ritzert

activity

20122025

most citedThe Belle II Physics Book

570 citations · 802 across the 28 of their papers we have counts for

collaborators

33 papers

physics.ins-det2025

Design of a Large Area Digital SiPM with High Fill Factor and Fully Serial Digital Readout for Single Photon Detection in Liquid Noble Gas Detectors

Peter Fischer, Michael Keller, Michael Ritzert

We present a 'digital SiPM' photo-detection chip combining single photon sensitive avalanche photo diodes and CMOS readout electronics on a single die. The chip has a size of $8046…

physics.ins-det2024

PETAT -- An ASIC for Simple and Efficient Readout of Large PET Scanners

Peter Fischer, Michael Ritzert, Thomas Kerschenbauer

Modern PET scanners based on scintillating crystals use solid state photo detectors for light readout. The small area of these devices is beneficial for spatial resolution, but als…

hep-ex2023

Search for lepton-flavor-violating $τ^{-} \to ℓ^{-} ϕ$ decays in 2019-2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +575

We report a search for lepton-flavor-violating decays $τ^{-} \to ℓ^{-} ϕ$ ( $ℓ^{-} = e^{-}, μ^{-}$ ) at the Belle II experiment, using a sample of electron-positron data produced at the Su…

hep-ex2023★ 2 cited

Observation of $B \to D^{(*)} K^{-} K_{S}^{0}$ decays using the 2019-2022 Belle II data sample

Belle II Collaboration, F. Abudinén, I. Adachi +575

We present a measurement of the branching fractions of four $B^{0, -} \to D^{(*) +, 0} K^{-} K_{S}^{0}$ decay modes. The measurement is based on data from SuperKEKB electron-positron colli…

hep-ex2023★ 3 cited

Measurement of the $B^{0} \to D^{*-} ℓ^{+} ν_{ℓ}$ branching ratio and $∣ V_{c b} ∣$ with a fully reconstructed accompanying $B$ meson in 2019-2021 Belle II data

F. Abudinén, I. Adachi, K. Adamczyk +581

We present a measurement of the $B^{0} \to D^{*-} ℓ^{+} ν_{ℓ}$ ( $ℓ = e, μ$ ) branching ratio and of the CKM parameter $∣ V_{c b} ∣$ using signal decays accompanied by a f…

hep-ex2022★ 1 cited

Determination of $∣ V_{c b} ∣$ from $B \to D ℓ ν$ decays using 2019-2021 Belle II data

Belle II collaboration, F. Abudinén, I. Adachi +590

We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{c b}$ using $B \to D ℓ ν$ decays. The result is based on $e^{+} e^{-} \to Υ (4 S)$ data…

hep-ex2022

Measurement of the photon-energy spectrum in inclusive $B \to X_{s} γ$ decays identified using hadronic decays of the recoil $B$ meson in 2019-2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +593

We measure the photon-energy spectrum in radiative bottom-meson ( $B$ ) decays into inclusive final states involving a strange hadron and a photon. We use SuperKEKB electron-positron…

hep-ex2022★ 2 cited

Measurement of Branching Fraction and Longitudinal Polarization in $B^{0} \to ρ^{+} ρ^{-}$ Decays at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +584

We present a measurement of the branching fraction and longitudinal polarization of $B^{0} \to ρ^{+} ρ^{-}$ decays. SuperKEKB electron-positron collision data corresponding to 189~fb$^{-…

hep-ex2022

Measurements of the branching fraction, isospin asymmetry, and lepton-universality ratio in $B \to J / ψ K$ decays at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +591

We report a study of $B \to J / ψ (ℓ^{+} ℓ^{-}) K$ decays, where $ℓ$ represents an electron or a muon, using $e^{+} e^{-}$ collisions at the $Υ (4 S)$ resonance. The data were col…

hep-ex2022★ 1 cited

First decay-time-dependent analysis of $B^{0} \to K_{S}^{0} π^{0}$ at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +590

We report measurements of the branching fraction ( $B$ ) and direct $C P$ -violating asymmetry ( $A_{C P}$ ) of the charmless decay $B^{0} \to K^{0} π^{0}$ at Belle II. A sample of…

hep-ex2022★ 1 cited

Study of Exclusive $B \to π e^{+} ν_{e}$ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb $^{- 1}$ of Belle II Data

Belle II Collaboration, F. Abudinén, I. Adachi +590

We present a reconstruction of the semileptonic decays $B^{0} \to π^{-} e^{+} ν_{e}$ and $B^{+} \to π^{0} e^{+} ν_{e}$ in a sample corresponding to 189.3 fb $^{- 1}$ of Belle II data, using events w…

hep-ex2022★ 4 cited

Measurement of the branching fraction for the decay $B \to K^{*} (892) ℓ^{+} ℓ^{-}$ at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +590

We report a measurement of the branching fraction of $B \to K^{*} (892) ℓ^{+} ℓ^{-}$ decays, where $ℓ^{+} ℓ^{-} = μ^{+} μ^{-}$ or $e^{+} e^{-}$ , using electron-positron collisions recorde…

hep-ex2021

Exclusive $B \to X_{u} ℓ ν_{ℓ}$ Decays with Hadronic Full-event-interpretation Tagging in 62.8 fb $^{- 1}$ of Belle II Data

Belle II Collaboration, F. Abudinén, I. Adachi +565

We present a reconstruction in early data of the semileptonic decay $B^{+} \to π^{0} ℓ^{+} ν_{ℓ}$ , and first results of a reconstruction of the decays $B^{+} \to ρ^{0} ℓ^{+} ν_{ℓ}$ and…

hep-ex2021

Rediscovery of $B^{0} \to J / ψ K_{L}^{0}$ at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +545

We present preliminary results on the reconstruction of the $B^{0} \to J / ψ K_{L}^{0}$ decay, where $J / ψ \to μ^{+} μ^{-}$ or $e^+e…

hep-ex2021

Measurement of the time-integrated mixing probability $χ_{d}$ with a semileptonic double-tagging strategy and $34.6 fb^{- 1}$ of Belle II collision data

Belle II Collaboration, F. Abudinén, I. Adachi +550

We present the first measurement of the time-integrated mixing probability $χ_{d}$ using Belle II data collected at a center-of-mass (CM) energy of 10.58 GeV, corresponding to the ma…

hep-ex2021★ 3 cited

First search for direct $C P$ -violating asymmetry in $B^{0} \to K^{0} π^{0}$ decays at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +551

We report on the first measurement of the direct $C P$ -violating asymmetry ( $A$ ) in the charmless decay $B^{0} \to K^{0} π^{0}$ at Belle II and an updated measurement of its bran…

hep-ex2021★ 3 cited

Study of $B \to D^{(*)} h$ decays using $62.8 fb^{- 1}$ of Belle II data

Belle II Collaboration, F. Abudinen, I. Adachi +549

We report measurements related to hadronic $B$ decays to final states that contain charm mesons. The analyses are performed on a $62.8 fb^{- 1}$ data set collected by the B…

physics.ins-det2020★ 2 cited

The trigger slow control system of the Belle II experiment

C. -H. Kim, Y. Unno, B. G. Cheon +16

The Belle II experiment at the SuperKEKB $e^{+} e^{-}$ collider in KEK, Japan, started physics data-taking with a complete detector from early 2019 with the primary physics goal of…

hep-ex2020

Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019--2020 Belle~II data

Belle II Collaboration, F. Abudinén, I. Adachi +544

We report on first measurements of branching fractions~( $B$ ) and CP-violating charge asymmetries~( $A$ ) in charmless $B$ decays at Belle~II. We use a sample of e…

hep-ex2020

Measurement of the semileptonic $B ˉ^{0} \to D^{*+} ℓ^{-} ν_{ℓ}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb $^{- 1}$ of Belle II data

Belle II Collaboration, F. Abudinen, I. Adachi +540

We present a first measurement of the $B^{0} ˉ \to D^{*+} ℓ^{-} ν_{ℓ}$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Inte…

hep-ex2020

Measurement of Hadronic Mass Moments $⟨ M_{X}^{n} ⟩$ in $B \to X_{c} ℓ ν$ Decays at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +540

We present measurements of the first six hadronic mass moments in semileptonic $B \to X_{c} ℓ ν$ decays. The hadronic mass moments, together with other observables of incl…

hep-ex2020

Exclusive $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb $^{- 1}$ of Belle II Data

Belle II Collaboration, F. Abudinén, I. Adachi +541

We present the results of the re-discovery of the decay $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ in 34.6 fb $^{- 1}$ of Belle II data using hadronic $B$ -tagging via the Full Event Interpretation…

hep-ex2020★ 2 cited

Studies of the semileptonic $B ˉ^{0} \to D^{*+} ℓ^{-} ν ˉ_{ℓ}$ and $B^{-} \to D^{0} ℓ^{-} ν ˉ_{ℓ}$ decay processes with 34.6 fb $^{- 1}$ of Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +542

We report measurements of the $B ˉ^{0} \to D^{*+} ℓ^{-} ν ˉ_{l}$ and $B^{-} \to D^{0} ℓ^{-} ν ˉ_{l}$ processes using 34.6 fb $^{- 1}$ of collision events recorded by the Belle…

hep-ex2020★ 2 cited

A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \to X ℓ ν$ decays

Belle II Collaboration, F. Abudinén, I. Adachi +540

Tag-side reconstruction is an important method for reconstructing $B$ meson decays with missing energy. The Belle II tag-side reconstruction algorithm, Full Event Interpretation, r…

Design of a Large Area Digital SiPM with High Fill Factor and Fully Serial Digital Readout for Single Photon Detection in Liquid Noble Gas Detectors

PETAT -- An ASIC for Simple and Efficient Readout of Large PET Scanners

Search for lepton-flavor-violating τ−→ℓ−ϕ decays in 2019-2021 Belle II data

Observation of B→D(∗)K−KS0​ decays using the 2019-2022 Belle II data sample

Measurement of the B0→D∗−ℓ+νℓ​ branching ratio and ∣Vcb​∣ with a fully reconstructed accompanying B meson in 2019-2021 Belle II data

Determination of ∣Vcb​∣ from B→Dℓν decays using 2019-2021 Belle II data

Measurement of the photon-energy spectrum in inclusive B→Xs​γ decays identified using hadronic decays of the recoil B meson in 2019-2021 Belle II data

Measurement of Branching Fraction and Longitudinal Polarization in B0→ρ+ρ− Decays at Belle II

Measurements of the branching fraction, isospin asymmetry, and lepton-universality ratio in B→J/ψK decays at Belle II

First decay-time-dependent analysis of B0→KS0​π0 at Belle II

Study of Exclusive B→πe+νe​ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb−1 of Belle II Data

Measurement of the branching fraction for the decay B→K∗(892)ℓ+ℓ− at Belle II

Exclusive B→Xu​ℓνℓ​ Decays with Hadronic Full-event-interpretation Tagging in 62.8 fb−1 of Belle II Data

Rediscovery of B0→J/ψKL0​ at Belle II

Measurement of the time-integrated mixing probability χd​ with a semileptonic double-tagging strategy and 34.6fb−1 of Belle II collision data

First search for direct CP-violating asymmetry in B0→K0π0 decays at Belle II

Study of B→D(∗)h decays using 62.8 fb−1 of Belle II data

The trigger slow control system of the Belle II experiment

Measurements of branching fractions and CP-violating charge asymmetries in charmless B decays reconstructed in 2019--2020 Belle~II data

Measurement of the semileptonic Bˉ0→D∗+ℓ−νℓ​ branching fraction with fully reconstructed B meson decays and 34.6 fb−1of Belle II data

Measurement of Hadronic Mass Moments ⟨MXn​⟩ in B→Xc​ℓν Decays at Belle II

Exclusive B0→π−ℓ+νℓ​ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb−1 of Belle II Data

Studies of the semileptonic Bˉ0→D∗+ℓ−νˉℓ​ and B−→D0ℓ−νˉℓ​ decay processes with 34.6 fb−1 of Belle II data

A calibration of the Belle II hadronic tag-side reconstruction algorithm with B→Xℓν decays

Search for lepton-flavor-violating $τ^{-} \to ℓ^{-} ϕ$ decays in 2019-2021 Belle II data

Observation of $B \to D^{(*)} K^{-} K_{S}^{0}$ decays using the 2019-2022 Belle II data sample

Measurement of the $B^{0} \to D^{*-} ℓ^{+} ν_{ℓ}$ branching ratio and $∣ V_{c b} ∣$ with a fully reconstructed accompanying $B$ meson in 2019-2021 Belle II data

Determination of $∣ V_{c b} ∣$ from $B \to D ℓ ν$ decays using 2019-2021 Belle II data

Measurement of the photon-energy spectrum in inclusive $B \to X_{s} γ$ decays identified using hadronic decays of the recoil $B$ meson in 2019-2021 Belle II data

Measurement of Branching Fraction and Longitudinal Polarization in $B^{0} \to ρ^{+} ρ^{-}$ Decays at Belle II

Measurements of the branching fraction, isospin asymmetry, and lepton-universality ratio in $B \to J / ψ K$ decays at Belle II

First decay-time-dependent analysis of $B^{0} \to K_{S}^{0} π^{0}$ at Belle II

Study of Exclusive $B \to π e^{+} ν_{e}$ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb $^{- 1}$ of Belle II Data

Measurement of the branching fraction for the decay $B \to K^{*} (892) ℓ^{+} ℓ^{-}$ at Belle II

Exclusive $B \to X_{u} ℓ ν_{ℓ}$ Decays with Hadronic Full-event-interpretation Tagging in 62.8 fb $^{- 1}$ of Belle II Data

Rediscovery of $B^{0} \to J / ψ K_{L}^{0}$ at Belle II

Measurement of the time-integrated mixing probability $χ_{d}$ with a semileptonic double-tagging strategy and $34.6 fb^{- 1}$ of Belle II collision data

First search for direct $C P$ -violating asymmetry in $B^{0} \to K^{0} π^{0}$ decays at Belle II

Study of $B \to D^{(*)} h$ decays using $62.8 fb^{- 1}$ of Belle II data

Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019--2020 Belle~II data

Measurement of the semileptonic $B ˉ^{0} \to D^{*+} ℓ^{-} ν_{ℓ}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb $^{- 1}$ of Belle II data

Measurement of Hadronic Mass Moments $⟨ M_{X}^{n} ⟩$ in $B \to X_{c} ℓ ν$ Decays at Belle II

Exclusive $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb $^{- 1}$ of Belle II Data

Studies of the semileptonic $B ˉ^{0} \to D^{*+} ℓ^{-} ν ˉ_{ℓ}$ and $B^{-} \to D^{0} ℓ^{-} ν ˉ_{ℓ}$ decay processes with 34.6 fb $^{- 1}$ of Belle II data

A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \to X ℓ ν$ decays