C. Finck

Reconstruction of $B \to I ¨ ℓ I^½_{ℓ}$ decays identified using hadronic decays of the recoil $B$ meson in 2019 -- 2021 Belle II data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +580

We present results on the semileptonic decays $B^{0} \to I ¨ ^{-} ℓ^{+} I^½_{ℓ}$ and $B^{+} \to I ¨ ^{0} ℓ^{+} I^½_{ℓ}$ in a sample corresponding to 189.9/fb of Belle II data at the SuperKEK…

Search for $e^{+} e^{-} \to I^^{3} I ¨ _{b J}$ ( $J$ = 0, 1, 2) near $s = 10.746$ GeV at Belle II

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

We search for the $e^{+} e^{-} \to I^^{3} I ¨ _{b J}$ ( $J$ = 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 t…

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…

Study of $e^{+} e^{-} \to h^{+} h^{-} J / I ¨ (h = I ¨ , K, p)$ via initial-state radiation at Belle~II

Belle II Collaboration, M. Abumusabh, I. Adachi +417

Using a data sample of 427.9 fb $^{- 1}$ collected by the Belle~II detector at or near the $I^¥ (4 S)$ and $I^¥ (10753)$ resonances, the cross sections for $e^{+} e^{-} \to h^{+} h^{-} J / I ¨ $ $(h=Ï/K…

Search for lepton flavor-violating decay modes $B^{0} \to K^{* 0} I ¨ ^{\pm} ℓ^{\mp}$ ( $ℓ = e, I^¼$ ) 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 $B^{0} \to K^{* 0} I ¨ ^{\pm} ℓ^{\mp}$ , where $ℓ^{\mp}$ is either an electron or a muon. The…

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…

First measurements of the branching fractions for the decay modes $I^_{c}^{0} \to I^ I^\cdot$ and $I^_{c}^{0} \to I^ I^\cdot^{'}$ and search for the decay $I^_{c}^{0} \to I^ I ¨ ^{0}$ using Belle and Belle II data

Belle, Belle II Collaborations, : +321

Using data samples of 988.4 fb $^{- 1}$ and 427.9 fb $^{- 1}$ collected with the Belle and Belle II detectors, we present a study of the singly Cabibbo-suppressed decays $Î_c^{0} \to…

Tests of light-lepton universality in angular asymmetries of $B^{0} \to D^{*-} ℓ I^½$ decays

Belle II Collaboration, I. Adachi, K. Adamczyk +416

We present the first comprehensive tests of light-lepton universality in the angular distributions of semileptonic $B^{0}$ -meson decays to charged spin-1 charmed mesons. We measure f…

Measurement of the $C P$ asymmetry in $D^{0} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ decays at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +400

We measure the time- and phase-space-integrated $C P$ asymmetry $A_{C P}$ in $D^{0} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ decays reconstructed in $e^{+} e^{-} \to c c ˉ$ events collected by the Belle II experim…

Measurement of the integrated luminosity of data samples collected during 2019-2022 by the Belle II experiment

The Belle II Collaboration, I. Adachi, L. Aggarwal +404

A series of data samples was collected with the Belle~II detector at the SuperKEKB collider from March 2019 to June 2022. We determine the integrated luminosities of these data sam…

nucl-ex2025

Cross Section Measurements of Large Angle Fragments Production in the Interaction of Carbon Ion Beams with Thin Targets

The FOOT Collaboration, Y. Dong, I. Mattei +87

The fragmentation cross sections of carbon ion beams with kinetic energies of $115 - 353 MeV/u$ impinging on thin targets of graphite (C), polyvinyl-toluene (C $_{9}$ H $_{10}$ )…

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +590

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

Search for the lepton-flavor-violating $I ¨ ^{-} \to e^{\mp} ℓ^{\pm} ℓ^{\mp}$ 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 $I ¨ ^{-} \to e^{\mp} ℓ^{\pm} ℓ^{-}$ , where $ℓ$ is a muon or an electron, using a data sampl…

New graph-neural-network flavor tagger for Belle II and measurement of $sin 2 I ¨ _{1}$ in $B^{0} \to J / I ¨ K_{S}^{0}$ decays

Belle II Collaboration, I. Adachi, L. Aggarwal +413

We present GFlaT, a new algorithm that uses a graph-neural-network to determine the flavor of neutral $B$ mesons produced in $I^¥ (4 S)$ decays. It improves previous algorithms by usi…

A search for feebly-interacting particles in $B$ decays with missing energy at Belle

Belle, Belle II Collaborations, : +406

We present a search for an invisible hidden-sector particle $X_{inv}$ , produced in $B^{0} \to D ˉ^{0} X_{inv}$ and $B^{\pm} \to h X_{inv}$ decays, where $h = I ¨ ^{\pm}$ ,…

Measurement of the energy dependence of the $e^{+} e^{-} \to B B ˉ$ , $B B ˉ^{}$ , and $B^{} B ˉ^{*}$ cross sections at Belle~II

Belle II Collaboration, I. Adachi, L. Aggarwal +466

We report measurements of the $e^{+} e^{-} \to B B ˉ$ , $B B ˉ^{*}$ , and $B^{*} B ˉ^{*}$ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected b…

Improved measurement of Born cross sections for $I ¨ _{b J} I ¨ $ and $I ¨ _{b J} (I ¨ ^{+} I ¨ ^{-} I ¨ ^{0})_{non - I ¨ }$ ( $J$ = 0, 1, 2) at Belle and Belle II

Belle, Belle II Collaborations, : +424

We study the processes $I ¨ _{b J} I ¨ $ and $I ¨ _{b J} (I ¨ ^{+} I ¨ ^{-} I ¨ ^{0})_{non - I ¨ }$ ( $J$ = 0, 1, 2) at center-of-mass energies $s$ from 10.73 to 11.02 GeV using a $142.5\,\mathr…

Determination of $∣ V_{c b} ∣$ using $B^{0} \to D^{*+} ℓ^{-} I^ˉ ½_{ℓ}$ decays with Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +416

We determine the CKM matrix-element magnitude $∣ V_{c b} ∣$ using $B^{0} \to D^{*+} ℓ^{-} I^ˉ ½_{ℓ}$ decays reconstructed in $189 fb^{- 1}$ of collision data colle…

Measurement of the branching fraction and $CP$ asymmetry of $B^{0} \to I ¨ ^{0} I ¨ ^{0}$ decays using $198 \times 1 0^{6}$ $B B$ pairs in Belle II data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +425

We report measurements of the branching fraction and $CP$ asymmetry in $B^{0} \to I ¨ ^{0} I ¨ ^{0}$ decays reconstructed at Belle II in an electron-positron collision sample conta…

Determination of $∣ V_{u b} ∣$ from simultaneous measurements of untagged $B^{0} \to I ¨ ^{-} ℓ^{+} I^½_{ℓ}$ and $B^{+} \to I ¨ ^{0} ℓ^{+} I^½_{ℓ}$ decays

Belle II Collaboration, I. Adachi, L. Aggarwal +417

We present a measurement of $∣ V_{u b} ∣$ from a simultaneous study of the charmless semileptonic decays $B^{0} \to I ¨ ^{-} ℓ^{+} I^½_{ℓ}$ and $B^{+} \to I ¨ ^{0} ℓ^{+} I^½_{ℓ}$ , where $\ell =…

Observation of $e^{+} e^{-} \to I^\cdot I^¥ (2 S)$ and search for $e^{+} e^{-} \to I^\cdot I^¥ (1 S), I^^{3} X_{b}$ at $s$ near 10.75 GeV

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

We present an analysis of the processes $e^{+} e^{-} \to I^\cdot I^¥ (1 S)$ , $I^\cdot I^¥ (2 S)$ , and $I^^{3} X_{b}$ with $X_{b} \to I ¨ ^{+} I ¨ ^{-} I ¨ _{b J}, I ¨ _{b J} \to I^^{3} I^¥ (1 S)$ $(J = 1, 2)$ reconstructed from $Î³Î³Ï^+Ï^…

First measurement of the masses of the $I^¥_{1} (1 D)$ and $I^¥_{3} (1 D)$ states and the energy dependence of the cross sections for $e^{+} e^{-} \to I^¥_{J} (1 D) I^\cdot$ and $e^{+} e^{-} \to I^¥_{J} (1 D) I ¨ ^{+} I ¨ ^{-}$

Belle, Belle II Collaborations, : +398

We study the processes $e^{+} e^{-} \to I^¥_{J} (1 D) I^\cdot$ and $e^{+} e^{-} \to I^¥_{J} (1 D) I ¨ ^{+} I ¨ ^{-}$ at center-of-mass energies $s$ =(10.73 -- 11.02) GeV using a $142.5 fb^{- 1}$ data sampl…

Measurement of $C P$ asymmetries in $B^{0} \to I^\cdot^{'} K_{s}^{0}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +399

We describe a measurement of charge-parity ( $C P$ ) violation asymmetries in $B^{0} \to I^\cdot^{'} K_{S}^{0}$ decays using Belle II data. We consider $I^\cdot^{'} \to I^\cdot (\to I^^{3} I^^{3}) I ¨ ^{+} I ¨ ^{-}$ and $Î·'\toÏ(\toÏ^…

First evidence of $X (3872) \to I ¨ ^{0} I ¨ _{c 0} (1 P)$ and search for $X (3915) \to I ¨ ^{0} I ¨ _{c 1} (1 P)$

Belle, Belle II Collaborations, : +412

We search for the pionic transitions $X (3872) \to I ¨ ^{0} I ¨ _{c J} (1 P)$ $(J = 0, 1, 2)$ and $X (3915) \to I ¨ ^{0} I ¨ _{c 1}$ in $B^{+} \to I ¨ ^{0} I ¨ _{c J} K^{+}$ decays using the Belle and Belle~II data sam…

Search for lepton flavor-violating decay modes $B^{0} \to K_{S}^{0} I ¨ ^{\pm} ℓ^{\mp} (ℓ = I^¼, e)$ with hadronic $B$ -tagging at Belle and Belle II

Belle, Belle II Collaborations, : +425

We present the first search for the lepton flavor-violating decay modes $B^{0} \to K_{S}^{0} I ¨ ^{\pm} ℓ^{\mp} (ℓ = I^¼, e)$ using the 711 fb $^{- 1}$ and 365 fb $^{- 1}$ data samples…

Observation of the radiative decay $D_{s} (2317)^{+} \to D_{s}^{*} I^^{3}$

Belle II Collaboration, M. Abumusabh, I. Adachi +367

We observe the radiative decay $D_{s 0}^{*} (2317)^{+} \to D_{s}^{*+} I^^{3}$ for the first time, with a significance exceeding $10$ standard deviations. The signal is found in the conti…

Precise measurement of the $D_{s}^{+}$ lifetime at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +359

We measure the lifetime of the $D_{s}^{+}$ meson using a data sample of 207 fb $^{- 1}$ collected by the Belle II experiment running at the SuperKEKB asymmetric-energy $e^{+} e^{-}$ collider…

physics.ins-det2022

The Silicon Vertex Detector of the Belle II Experiment

G. Dujany, K. Adamczyk, L. Aggarwal +78

In 2019 the Belle II experiment started data taking at the asymmetric SuperKEKB collider (KEK, Japan) operating at the Y(4S) resonance. Belle II will search for new physics beyond…

Search for a $I^¼^{+} I^¼^{-}$ resonance in four-muon final states at Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +401

We report on a search for a resonance $X$ decaying to a pair of muons in $e^{+} e^{-} \to I^¼^{+} I^¼^{-} X$ events in the 0.212-9.000 GeV/ $c^{2}$ mass range, using 178 fb $^{- 1}$ o…

Measurement of the $D^{0} \to K^{-} I ¨ ^{+} e^{+} e^{-}$ branching fraction and search for $D^{0} \to I ¨ ^{+} I ¨ ^{-} e^{+} e^{-}$ 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 $D^{0} \to K^{+} K^{-} e^{+} e^{-}$ , $I ¨ ^{+} I ¨ ^{-} e^{+} e^{-}$ , and $K^{-} I ¨ ^{+} e^{+} e^{-}$ using a 942 fb $^{- 1}$ data se…

Search for an invisible $Z^{'}$ in a final state with two muons and missing energy at Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +385

The $L_{I^} ¼ - L_{I ¨} $ extension of the standard model predicts the existence of a lepton-flavor-universality-violating $Z^{'}$ boson that couples only to the heavier lepton families…

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +591

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

Study of $I^¥ (10753)$ decays to $I ¨ ^{+} I ¨ ^{-} I^¥ (n S)$ final states at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +393

We present an analysis of the process $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I^¥ (n S)$ (where $n$ = 1, 2, or 3) reconstructed in $19.6$ $f b^{- 1}$ of Belle II data during a special run of t…

Determination of $∣ V_{c b} ∣$ from $B \to D ℓ I^½$ decays using 2019-2021 Belle II data

Belle II collaboration, F. AbudinÃ©n, I. Adachi +590

We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{c b}$ using $B \to D ℓ I^½$ decays. The result is based on $e^{+} e^{-} \to I^¥ (4 S)$ dat…

Measurement of $C P$ asymmetries in $B^{0} \to I ¨ K_{S}^{0}$ decays with Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +432

We present a measurement of time-dependent rate asymmetries in $B^{0} \to I ¨ K_{S}^{0}$ decays to search for non-standard-model physics in $b \to q q s$ transitions. The data samp…

nucl-ex2014

Zero degree measurements of 12C fragmentation at 95 MeV/nucleon on thin targets

J. Dudouet, M. Labalme, D. Cussol +5

During therapeutic treatments using ions such as carbon, nuclear interactions between the incident ions and nuclei present in organic tissues may occur, leading to the attenuation…

Measurement of the branching fraction and $CP$ -violating asymmetry of the decay $B^{0} \to I ¨ ^{0} I ¨ ^{0}$ using $387$ million bottom-antibottom meson pairs in Belle II data

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

We measure the branching fraction and $CP$ -violating flavor-dependent rate asymmetry of $B^{0} \to I ¨ ^{0} I ¨ ^{0}$ decays reconstructed using the Belle II detector in an electro…

Search for a dark photon and an invisible dark Higgs boson in $I^¼^{+} I^¼^{-}$ and missing energy final states with the Belle II experiment

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +357

The dark photon $A^{'}$ and the dark Higgs boson $h^{'}$ are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of $A^\pri…

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

Belle II Collaboration, F. AbudinÃ©n, 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…

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…

Measurement of the branching fraction of the decay $B^{-} \to D^{0} I ¨ (770)^{-}$ at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +389

We measure the branching fraction of the decay $B^{-} \to D^{0} I ¨ (770)^{-}$ using data collected with the Belle II detector. The data contain 387 million $B B$ pairs produced…

Study of $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I^¥ (1 D)$ at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +404

The bottomonium spectrum, consisting of bound states of a $b$ quark and an anti- $b$ quark, provides an excellent laboratory for probing quantum chromodynamics in the non-perturbati…

Study of Exclusive $B \to I ¨ e^{+} I^½_{e}$ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb $^{- 1}$ of Belle II Data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +590

We present a reconstruction of the semileptonic decays $B^{0} \to I ¨ ^{-} e^{+} I^½_{e}$ and $B^{+} \to I ¨ ^{0} e^{+} I^½_{e}$ in a sample corresponding to 189.3 fb $^{- 1}$ of Belle II data, using even…

nucl-ex2012

Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV

A. Adare, S. S. Adler, S. Afanasiev +543

Direct photons have been measured in sqrt(s_NN)=200 GeV d+Au collisions at midrapidity. A wide p_T range is covered by measurements of nearly-real virtual photons (1<p_T<6 GeV/c) a…

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +575

We report a search for lepton-flavor-violating decays $I ¨ ^{-} \to ℓ^{-} I ¨ $ ( $ℓ^{-} = e^{-}, I^¼^{-}$ ) at the Belle II experiment, using a sample of electron-positron data produced at the…

Observation of the decays $B^{+} \to I^£_{c} (2455)^{++} I^ˉ _{c}^{' -}$ and $B^{0} \to I^£_{c} (2455)^{0} I^ˉ _{c}^{'0}$

Belle, Belle II Collaborations, : +403

We report the first observation of the decays $B^{+} \to I^£_{c} (2455)^{++} I^ˉ _{c}^{' -}$ and $B^{0} \to I^£_{c} (2455)^{0} I^ˉ _{c}^{'0}$ , with significances of $6.4\,…

Test of light-lepton universality in $I ¨ $ decays with the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +428

We present a measurement of the ratio $R_{I^} ¼ = B (I ¨ ^{-} \to I^¼^{-} I^ˉ ½_{I^} ¼ I^½_{I ¨} ) / B (I ¨ ^{-} \to e^{-} I^ˉ ½_{e} I^½_{I ¨} )$ of branching fractions $B$ of the $I ¨ $ lepto…

Search for Pcs(4459) and Pcs(4338) in Upsilon(1S,2S) inclusive decays at Belle

I. Adachi, L. Aggarwal, H. Ahmed +402

Using data samples of 102 million Upsilon(1S) events and 158 million Upsilon(2S) events collected by the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider, we search f…

Model-independent measurement of $D^{0}$ - $D^{0}$ mixing parameters in $D^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-}$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +339

We perform a model-independent measurement of the $D^{0}$ - $D^{0}$ mixing parameters using samples of $e^{+} e^{-}$ -collision data collected by the Belle and Belle II experiment…

Measurement of time-dependent $C P$ asymmetries in $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-} I^^{3}$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +350

We present a measurement of the time-dependent $C P$ asymmetry in $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-} I^^{3}$ decays using a data set of 365 fb $^{- 1}$ recorded by the Belle II experim…

Novel method for the identification of the production flavor of neutral charmed mesons

Belle II Collaboration, I. Adachi, L. Aggarwal +396

We propose a new algorithm for the identification of the production flavor of neutral $D$ mesons in the Belle II experiment. The algorithm exploits the correlation between the flav…

Searches for charged-lepton-flavor violation in $I ¨ _{b J} (1 P)$ decays

Belle, Belle II Collaborations, : +415

We report the first searches for charged-lepton-flavor violation in decays of $I ¨ _{b J} (1 P)$ ( $J = 0, 1,$ and $2$ ) to a pair of charged leptons using 158 million $I^¥ (2 S)$ decays colle…

Measurement of branching fractions and direct $C P$ asymmetries for $B \to K I ¨ $ and $B \to I ¨ I ¨ $ decays at Belle II

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

We report measurements of the branching fractions and direct $CP$ asymmetries of the decays $B^{0} \to K^{+} I ¨ ^{-}$ , $B^{+} \to K^{+} I ¨ ^{0}$ , $B^{+} \to K^{0} I ¨ ^{+}$ , and $B^{0} \to K^{0} I ¨ ^{0}$ ,…

Study of $B^{+} \to I^¼^{+} I^½_{I^} ¼$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +412

We report a measurement of the branching fraction for the leptonic decay $B^{+} \to I^¼^{+} I^½_{I^} ¼$ . This work presents the first $B^{+} \to I^¼^{+} I^½_{I^} ¼$ result using Belle~II data, an updated Be…

Measurement of the time-integrated $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays using opposite-side flavor tagging at Belle and Belle II

Belle, Belle II Collaborations, : +378

We measure the time-integrated $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays reconstructed in $e^{+} e^{-} \to c c$ events collected by the Belle and Belle II exp…

physics.ins-det2026

Development for the Belle II vertex detector upgrade with depleted monolithic active pixel sensors

Y. Onuki, M. Babeluk, T. Bergauer +85

The vertex detector upgrade project for the Belle II experiment, based on CMOS depleted monolithic active pixel sensor technology, is planned to be carried out in conjunction with…

Measurement of inclusive $B \to X_{u} ℓ I^½$ 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 $e^{+} e^{-} \to I^¥ (4 S) \to B B ˉ$ data collected by the Belle II experiment is used to measure the partial branching fractions of charmless semileptonic…

Measurement of $B \to K^{*} (892) I^^{3}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +451

We present measurements of $B \to K^{*} (892) I^^{3}$ decays using $365 fb^{- 1}$ of data collected from 2019 to 2022 by the Belle~II experiment at the SuperKEKB asymmetric-energ…

nucl-th1996

Microscopic Study of Superdeformed Rotational Bands in 151Tb

N. El Aouad, J. Dobaczewski, J. Dudek +8

Structure of eight superdeformed bands in the nucleus 151Tb is analyzed using the results of the Hartree-Fock and Woods-Saxon cranking approaches. It is demonstrated that far going…

Measurement of the $I ¨ $ -lepton mass with the Belle~II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +418

We present a measurement of the $I ¨ $ -lepton mass using a sample of about 175 million $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-}$ events collected with the Belle II detector at the SuperKEKB $e^{+} e^{-}$ col…

Determination of $∣ V_{u b} ∣$ from untagged $B^{0} \to I ¨ ^{-} ℓ^{+} I^½_{ℓ}$ decays using 2019-2021 Belle II data

Belle II Collaboration, K. Adamczyk, L. Aggarwal +588

We present an analysis of the charmless semileptonic decay $B^{0} \to I ¨ ^{-} ℓ^{+} I^½_{ℓ}$ , where $ℓ = e, I^¼$ , from 198.0 million pairs of $B B ˉ$ mesons recorded by the Belle…

nucl-ex2013

Transverse-energy distributions at midrapidity in $p$ $+$ $p$ , $d$ $+$ Au, and Au $+$ Au collisions at $s_{_{N N}} = 62.4$ --200~GeV and implications for particle-production models

S. S. Adler, S. Afanasiev, C. Aidala +388

Measurements of the midrapidity transverse energy distribution, $d\Et/dÎ·$, are presented for $p$ $+$ $p$ , $d$ $+$ Au, and Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV and addition…

Measurements of the branching fractions of $I^_{c}^{+} \to I^£^{+} K_{S}^{0}$ , $I^_{c}^{+} \to I^^{0} I ¨ ^{+}$ , and $I^_{c}^{+} \to I^^{0} K^{+}$ at Belle and Belle II

Belle, Belle II Collaborations, : +357

Using 983.0 $fb^{- 1}$ and 427.9 $fb^{- 1}$ data samples collected with the Belle and Belle II detectors at the KEKB and SuperKEKB asymmetric energy $e^{+} e^{-}$ colliders, res…

Search for $C P$ violation in $D_{(s)}^{+} \to K_{S}^{0} K^{-} I ¨ ^{+} I ¨ ^{+}$ decays using triple and quadruple products

Belle, Belle II Collaborations, : +366

We perform the first search for $C P$ violation in $D_{(s)}^{+} \to K_{S}^{0} K^{-} I ¨ ^{+} I ¨ ^{+}$ decays. We use a combined data set from the Belle and Belle II experiments, which…

Measurement of the branching fraction of the $B^{0} \to K_{S}^{0} I ¨ ^{0} I^^{3}$ decay using 190 fb $^{- 1}$ of Belle II data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +590

We report the measurement of the branching fraction of the $B^{0} \to K_{S}^{0} I ¨ ^{0} I^^{3}$ decay in $e^{+} e^{-} \to I^¥ (4 S) \to B B$ data recorded by the Belle II experiment at the…

Measurement of the time-integrated $C P$ asymmetry in $D^{0} \to I ¨ ^{0} I ¨ ^{0}$ decays at Belle II

Belle II Collaboration, I. Adachi, Y. Ahn +372

We measure the time-integrated $C P$ asymmetry, $A_{C P}$ , in $D^{0} \to I ¨ ^{0} I ¨ ^{0}$ decays reconstructed in $e^{+} e^{-} \to c c ˉ$ events collected by Belle II during 2019--2022. The data c…

A test of lepton flavor universality with a measurement of $R (D^{*})$ using hadronic $B$ tagging at the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +434

The ratio of branching fractions $R (D^{*}) = B (B \to D^{*} I ¨ ^{-} I^½_{I ¨} )$ /$\mathcal{B} (\overline{B} \rightarrow D^{*} \ell^{-} \overlineÎ½_{\…

Measurement of the $B^{0} \to D^{*-} ℓ^{+} I^½_{ℓ}$ branching ratio and $∣ V_{c b} ∣$ with a fully reconstructed accompanying $B$ meson in 2019-2021 Belle II data

F. AbudinÃ©n, I. Adachi, K. Adamczyk +581

We present a measurement of the $B^{0} \to D^{*-} ℓ^{+} I^½_{ℓ}$ ( $ℓ = e, I^¼$ ) branching ratio and of the CKM parameter $∣ V_{c b} ∣$ using signal decays accompanied by a…

physics.ins-det2026

Application of exhaustive simulation flow for advanced performance prediction of monolithic active pixel sensors

E. Sacchetti, M. Babeluk, T. Bergauer +86

Monolithic active pixel sensor (MAPS) developments have pushed the detection performance in various directions, especially relative to timing where nanosecond-level precision is no…

Observation of the decay $B^{0} \to J / I ¨ I ¨ $ at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +383

We measure the branching fraction of the decay $B^{0} \to J / I ¨ I ¨ $ using data collected with the Belle II detector at the SuperKEKB collider. The data contain $(387 \pm 6) \times 10^6…

Measurements of the branching fractions of $I^_{c}^{0} \to I^^{0} I ¨ ^{0}$ , $I^_{c}^{0} \to I^^{0} I^\cdot$ , and $I^_{c}^{0} \to I^^{0} I^\cdot^{'}$ and asymmetry parameter of $I^_{c}^{0} \to I^^{0} I ¨ ^{0}$

Belle, Belle II Collaborations, : +382

We present a study of $I^_{c}^{0} \to I^^{0} I ¨ ^{0}$ , $I^_{c}^{0} \to I^^{0} I^\cdot$ , and $I^_{c}^{0} \to I^^{0} I^\cdot^{'}$ decays using the Belle and Belle~II data samples, which have integr…

Measurement of $B^{+} \to I ¨ ^{+} I^½_{I ¨} $ branching fraction with a hadronic tagging method at Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +341

We present a measurement of the branching fraction of $B^{+} \to I ¨ ^{+} I^½_{I ¨} $ decays using $(387 \pm 6) \times 1 0^{6}$ $I^¥ (4 S)$ collected between 2019 and 2022 with the Belle II detector at t…

Search for lepton-flavor-violating $I ¨ ^{-} \to I^¼^{-} I^¼^{+} I^¼^{-}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +429

We present the result of a search for the charged-lepton-flavor violating decay $I ¨ ^{-} \to I^¼^{-} I^¼^{+} I^¼^{-}$ using a $424 f b^{- 1}$ sample of data recorded by the Belle II experiment at t…

Measurement of branching-fraction ratios and $C P$ asymmetries in $B^{\pm} \to D_{C P \pm} K^{\pm}$ decays at Belle and Belle II

The Belle, Belle II Collaborations, : +427

We report results from a study of $B^{\pm} \to D K^{\pm}$ decays followed by $D$ decaying to $C P$ ~eigenstates, where $D$ indicates a $D^{0}$ or $D ˉ^{0}$ meson. These decays a…

Measurement of time-dependent $C P$ violation parameters in $B^{0} \to K_{S}^{0} I ¨ ^{0} I^^{3}$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +416

We perform a measurement of time-dependent $C P$ violation parameters in $B^{0} \to K_{S}^{0} I ¨ ^{0} I^^{3}$ decays using a dataset of approximately $772 \times 1 0^{6}$ and $521 \times 10…

Measurement of branching fractions, CP asymmetry, and isospin asymmetry for $B \to I ¨ I^^{3}$ decays using Belle and Belle II data

Belle II Collaboration, I. Adachi, K. Adamczyk +407

We present measurements of $B^{+} \to I ¨ ^{+} I^^{3}$ and $B^{0} \to I ¨ ^{0} I^^{3}$ decays using a combined data sample of $772 \times 1 0^{6}$ $B B$ pairs collected by the…

Charged-lepton identification at Belle~II

Belle II Collaboration, M. Abumusabh, I. Adachi +409

Effective particle identification capabilities are a strategic priority for the physics program of the Belle~II experiment. We describe the algorithms used at Belle~II for identify…

Observation of time-dependent $C P$ violation and measurement of the branching fraction of $B^{0} \to J / I ¨ I ¨ ^{0}$ decays

Belle II Collaboration, I. Adachi, L. Aggarwal +391

We present a measurement of the branching fraction and time-dependent charge-parity ( $C P$ ) decay-rate asymmetries in $B^{0} \to J / I ¨ I ¨ ^{0}$ decays. The data sample was collected with t…

Search for $I^^{0} p$ , $I^c ◯^{-} p$ , and $I^c ◯^{-} n$ dibaryons in $I^¥ (1 S)$ and $I^¥ (2 S)$ decays at Belle

Belle, Belle II Collaborations, : +367

We search for $I^^{0} p$ , $I^c ◯^{-} p$ , and $I^c ◯^{-} n$ dibaryon states in $I^¥ (1 S)$ and $I^¥ (2 S)$ decays, probing mass regions near the corresponding baryon-pair thresholds. Multistrange baryon…

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^{(*)+} \,Ï^- \, \overlineÎ½_Ï)}{{\cal B}(\overline{B}{}^0…

Measurement of $C P$ asymmetries in $B^{0} \to K_{S}^{0} I ¨ ^{0} I^^{3}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +436

We report measurements of time-dependent $C P$ asymmetries in $B^{0} \to K_{S}^{0} I ¨ ^{0} I^^{3}$ decays based on a data sample of $(388 \pm 6) \times 1 0^{6}$ $B B ˉ$ events collected at the $Î¥(4…

Measurement of $C P$ asymmetries and branching-fraction ratios for $B^{\pm} \to D K^{\pm}$ and $D I ¨ ^{\pm}$ with $D \to K_{S}^{0} K^{\pm} I ¨ ^{\mp}$ using Belle and Belle II data

Belle, Belle II Collaboration, : +408

We measure $C P$ asymmetries and branching-fraction ratios for $B^{\pm} \to D K^{\pm}$ and $D I ¨ ^{\pm}$ decays with $D \to K_{S}^{0} K^{\pm} I ¨ ^{\mp}$ , where $D$ is a superposition of $D^{0}$ a…

Measurement of mixing-induced CP violation in the decay $B^{0} \to I ¨ ^{0} I ¨ ^{0}$

Belle II Collaboration, M. Abumusabh, I. Adachi +437

Measurements of charge-parity (CP) violation in quark transitions provide stringent tests of the current theory and sensitive probes of particles or interactions beyond it. We repo…

physics.ins-det2023

Upgrade of Belle II Vertex Detector with CMOS Pixel Technology

M. Schwickardi, M. Babeluk, M. Barbero +27

The Belle II experiment at KEK in Japan considers upgrading its vertex detector system to address the challenges posed by high background levels caused by the increased luminosity…

physics.ins-det2022

CMOS pixel sensors optimized for large ionizing dynamic

W. Ren, J. Baudot, L. Federici +9

Monolithic active pixel sensors (MAPS) are now well established as a technology for tracking charged particles, especially when low material budget is desirable. For such applicati…

physics.ins-det2025

Operational experience and performance of the Silicon Vertex Detector after the first long shutdown of Belle II

K. Ravindran, K. Adamczyk, H. Aihara +62

In 2024, the Belle II experiment resumed data taking after the Long Shutdown 1, which was required to install a two-layer pixel detector and upgrade accelerator components. We desc…

Measurement of $C P$ asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +450

We report a measurement of decay-time dependent charge-parity ( $C P$ ) asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays. We use $387 \times 1 0^{6} B B ˉ$ pairs collected at…

Search for Lepton-Flavor-Violating $I ¨ $ Decays to a Lepton and an Invisible Boson at Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +398

We search for lepton-flavor-violating $I ¨ ^{-} \to e^{-} I^\pm$ and $I ¨ ^{-} \to I^¼^{-} I^\pm$ decays, where $I^\pm$ is an invisible spin-0 boson. The search uses electron-positron collisions at $10.58$ G…

Measurement of the Branching Fraction of $I^_{c}^{+} \to p K_{S}^{0} I ¨ ^{0}$ at Belle

The Belle, Belle II Collaborations, : +426

We report a precise measurement of the ratio of branching fractions $B (I^_{c}^{+} \to p K_{S}^{0} I ¨ ^{0}) / B (I^_{c}^{+} \to p K^{-} I ¨ ^{+})$ using 980 fb $^{- 1}$ of $e^{+} e^{-}$ data fro…

First search for $B \to X_{s} I^½ I^ˉ ½$ decays

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

We report the first search for the flavor-changing neutral-current decays $B \to X_{s} I^½ I^ˉ ½$ , where $X_{s}$ is a hadronic system with strangeness equal to 1, in data co…

Search for the decay $B^{+} \to K^{+} τ^{+} τ^{-}$ using data from the Belle and Belle II experiments

Belle, Belle II Collaborations, : +446

We report a search for the rare decay $B^{+} \to K^{+} τ^{+} τ^{-}$ using $1.2 \times 1 0^{9}$ $Υ (4 S)$ mesons produced near threshold in electron-positron collisions and colle…

Search for an Axion-Like Particle in $B \to K^{(*)} a (\to I^^{3} I^^{3})$ Decays at Belle

Belle, Belle II Collaborations, : +422

We report a search for an axion-like particle $a$ in $B \to K^{(*)} a (\to I^^{3} I^^{3})$ decays using data collected with the Belle detector at the KEKB asymmetric energy el…

Measurement of decay-time dependent $C P$ violation in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ using 2019--2021 Belle II data

We report a measurement of decay-time dependent $C P$ -violating parameters in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays. We use $(198.0 \pm 3.0) \times 1 0^{6} B B$ pairs c…

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

We report a measurement of the branching fraction of $B \to K^{*} (892) ℓ^{+} ℓ^{-}$ decays, where $ℓ^{+} ℓ^{-} = I^¼^{+} I^¼^{-}$ or $e^{+} e^{-}$ , using electron-positron collisions recor…

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

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

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

Belle, Belle II Collaborations, : +396

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

Evidence for $B^{+} \to K^{+} I^½ I^ˉ ½$ decays

Belle II Collaboration, I. Adachi, K. Adamczyk +452

We search for the rare decay $B^{+} \to K^{+} I^½ I^ˉ ½$ in a $362 fb^{- 1}$ sample of electron-positron collisions at the $I^¥ (4 S)$ resonance collected with the Belle II…

Search for the $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-}$ decay

Belle, Belle II Collaborations, : +432

We present the first search for $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-}$ decays. We look for signal decays in $B^{0} B ˉ^{0}$ events produced in asymmetric-energy electron-positron collisions.…

Measurement of the branching fractions of $B ˉ \to D^{()} K^{-} K_{(S)}^{() 0}$ and $B ˉ \to D^{(*)} D_{s}^{-}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +404

We present measurements of the branching fractions of eight $B^{0} \to D^{(*) +} K^{-} K_{(S)}^{(*) 0}$ , $B^{-} \to D^{(*) 0} K^{-} K_{(S)}^{(*) 0}$ decay channels. The results are…