Study of Exclusive $B\to \ddot{I}€e^{+}\hat{I}{½}_e$ 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 $B^0\to \ddot{I}{€}^{-}{e}^{+}\hat{I}{½}_e$ and $B^{+}\to \ddot{I}{€}^0{e}^{+}\hat{I}{½}_e$ in a sample corresponding to 189.3 fb${}^{-1}$ of Belle II data, using even…

Measurement of the time-integrated CP asymmetry in $D^0\to K_S^0{K}_S^0$ decays using Belle and Belle II data

Belle, Belle II Collaborations, : +360

We measure the time-integrated CP asymmetry in $D^0\to K_S^0{K}_S^0$ decays reconstructed in $e^{+}{e}^{-}\to c\overline{c}$ events collected by the Belle a…

Design and Commissioning of Readout Electronics for a $K_L^0$ and $\hat{I}¼$ Detector at the Belle II Experiment

C. Ketter, M. Andrew, T. Aushev +71

The K-long and muon detector (KLM) constitutes the outer-most volume of the Belle II spectrometer at the interaction region of the SuperKEKB collider in Tsukuba, Japan. The KLM det…

Search for a $\ddot{I}{„}^{+}\ddot{I}{„}^{-}$ resonance in $e^{+}{e}^{-}\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}\ddot{I}{„}^{+}\ddot{I}{„}^{-}$ events with the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +464

We report the first search for a non-standard-model resonance decaying into $\ddot{I}„$ pairs in $e^{+}{e}^{-}\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}\ddot{I}{„}^{+}\ddot{I}{„}^{-}$ events in the 3.6-10 GeV/$c^2$ mass range.…

Search for lepton-flavor-violating $\ddot{I}{„}^{-}\to {\ell }^{-}\ddot{I}•$ decays in 2019-2021 Belle II data

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

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

Test of light-lepton universality in $\ddot{I}„$ decays with the Belle II experiment

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

We present a measurement of the ratio $R_{\hat{I}}¼=\mathcal{B}(\ddot{I}{„}^{-}\to \hat{I}{¼}^{-}\bar{\hat{I}}{½}_{\hat{I}}¼\hat{I}{½}_{\ddot{I}}„)/\mathcal{B}(\ddot{I}{„}^{-}\to e^{-}\bar{\hat{I}}{½}_e\hat{I}{½}_{\ddot{I}}„)$ of branching fractions $\mathcal{B}$ of the $\ddot{I}„$ lepto…

Opportunities for precision QCD physics in hadronization at Belle II -- a snowmass whitepaper

A. Accardi, Y. T. Chien, D. d'Enterria +18

This document presents a selection of QCD studies accessible to high-precision studies with hadronic final states in $e^{+}{e}^{-}$ collisions at Belle II. The exceptionally clean enviro…

Measurement of $CP$ violation in $B^0\to K_S^0\ddot{I}{€}^0$ decays at Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +399

We report a measurement of the $CP$-violating parameters $A$ and $S$ in $B^0\to K_S^0\ddot{I}{€}^0$ decays at Belle II using a sample of $387\times 10^6$ $B\bar{B}$ events reco…

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

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

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

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…

Determination of $|V_{cb}|$ using $B\to D\ell \hat{I}{½}_{\ell }$ Decays at Belle II

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

We present a determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ from the decay $B\to D\ell \hat{I}{½}_{\ell }$ using a $365{\mathrm{fb}}^{-1}$ $e^{+}{e}^{-}\to \hat{I}\yen (4S)\to B\bar{B}$…

Search for $B^0\to K^{\ast 0}\ddot{I}{„}^{+}\ddot{I}{„}^{-}$ decays at the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +446

We present a search for the rare flavor-changing neutral-current decay $B^0\to K^{\ast 0}\ddot{I}{„}^{+}\ddot{I}{„}^{-}$ with data collected by the Belle II experiment at the SuperKEKB electron-posit…

Model-independent measurement of $D^0$-$\overline{D}{}^0$ mixing parameters in $D^0\to K_S^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +339

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

Search for the decay $B^0\to {\hat{I}}^3{\hat{I}}^3$ using Belle and Belle II data

Belle, Belle II Collaborations, : +407

We report the result of a search for the rare decay $B^0\to {\hat{I}}^3{\hat{I}}^3$ using a combined dataset of $753\times 10^6$ $B\bar{B}$ pairs collected by the Belle experiment and $387\times…

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 $\ddot{I}{‡}_{bJ}(1P)$ decays

Belle, Belle II Collaborations, : +415

We report the first searches for charged-lepton-flavor violation in decays of $\ddot{I}{‡}_{bJ}(1P)$ ($J=0,1,$ and $2$) to a pair of charged leptons using 158 million $\hat{I}\yen (2S)$ decays colle…

Measurement of branching fractions and direct $CP$ asymmetries for $B\to K\ddot{I}€$ and $B\to \ddot{I}€\ddot{I}€$ 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 $B^0\to K^{+}\ddot{I}{€}^{-}$, $B^{+}\to K^{+}\ddot{I}{€}^0$, $B^{+}\to K^0\ddot{I}{€}^{+}$, and $B^0\to K^0\ddot{I}{€}^0$,…

Reconstruction of $B\to \ddot{I}\ell \hat{I}{½}_{\ell }$ decays identified using hadronic decays of the recoil $B$ meson in 2019 -- 2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +580

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

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

Belle, Belle II Collaborations, : +412

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

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 $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\ddot{I}ˆ(h=\ddot{I}€,K,p)$ 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 $\hat{I}\yen (4S)$ and $\hat{I}\yen (10753)$ resonances, the cross sections for $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\ddot{I}ˆ$ $(h=π/K…

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

Belle, Belle II Collaborations, : +378

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

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

Measurement of inclusive $B\to X_u\ell \hat{I}½$ partial branching fractions and $|V_{ub}|$ at Belle II

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

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

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

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

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

Tests of light-lepton universality in angular asymmetries of $B^0\to D^{\ast -}\ell \hat{I}½$ 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 $\ddot{I}„$-lepton mass with the Belle~II experiment

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

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

Determination of $|V_{ub}|$ from untagged $B^0\to \ddot{I}{€}^{-}{\ell }^{+}\hat{I}{½}_{\ell }$ decays using 2019-2021 Belle II data

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

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

Snowmass 2021 White Paper on Upgrading SuperKEKB with a Polarized Electron Beam: Discovery Potential and Proposed Implementation

A. Accardi, D. M. Asner, H. Atmacan +105

Upgrading the SuperKEKB electron-positron collider with polarized electron beams opens a new program of precision physics at a center-of-mass energy of 10.58 GeV. This white paper…

Measurement of the branching fraction of the $B^0\to K_S^0\ddot{I}{€}^0{\hat{I}}^3$ decay using 190 fb${}^{-1}$ of Belle II data

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

We report the measurement of the branching fraction of the $B^0\to K_S^0\ddot{I}{€}^0{\hat{I}}^3$ decay in $e^{+}{e}^{-}\to \hat{I}\yen (4S)\to B\overline{B}$ data recorded by the Belle II experiment at the…

Measurement of the time-integrated $CP$ asymmetry in $D^0\to \ddot{I}{€}^0\ddot{I}{€}^0$ decays at Belle II

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

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

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

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

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

Measurement of the $B^0\to D^{\ast -}{\ell }^{+}\hat{I}{½}_{\ell }$ branching ratio and $|V_{cb}|$ 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 $B^0\to D^{\ast -}{\ell }^{+}\hat{I}{½}_{\ell }$ ($\ell =e,\hat{I}¼$) branching ratio and of the CKM parameter $|V_{cb}|$ using signal decays accompanied by a…

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…

Measurements of the branching fractions of $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\ddot{I}{€}^0$, $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\hat{I}\cdot$, and $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\hat{I}{\cdot }^{\prime }$ and asymmetry parameter of $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\ddot{I}{€}^0$

Belle, Belle II Collaborations, : +382

We present a study of $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\ddot{I}{€}^0$, $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\hat{I}\cdot$, and $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\hat{I}{\cdot }^{\prime }$ decays using the Belle and Belle~II data samples, which have integr…

First decay-time-dependent analysis of $B^0\to K_S^0\ddot{I}{€}^0$ at Belle II

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

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

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

Search for lepton-flavor-violating $\ddot{I}{„}^{-}\to \hat{I}{¼}^{-}\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ 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 $\ddot{I}{„}^{-}\to \hat{I}{¼}^{-}\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ using a $424f{b}^{-1}$ sample of data recorded by the Belle II experiment at t…

New graph-neural-network flavor tagger for Belle II and measurement of $\sin 2\ddot{I}{•}_1$ in $B^0\to J/\ddot{I}ˆK_{\text{S}}^0$ 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 $\hat{I}\yen (4S)$ decays. It improves previous algorithms by usi…

Measurement of branching-fraction ratios and $CP$ asymmetries in $B^{\pm }\to D_{CP\pm }{K}^{\pm }$ 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 $CP$~eigenstates, where $D$ indicates a $D^0$ or ${\bar{D}}^0$ meson. These decays a…

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 $X_{\mathrm{inv}}$, produced in $B^0\to {\bar{D}}^0{X}_{\mathrm{inv}}$ and $B^{\pm }\to h{X}_{\mathrm{inv}}$ decays, where $h=\ddot{I}{€}^{\pm }$,…

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

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

We present measurements of $B^{+}\to \ddot{I}{}^{+}{\hat{I}}^3$ and $B^0\to \ddot{I}{}^0{\hat{I}}^3$ decays using a combined data sample of $772\times 10^6$ $B\overline{B}$ pairs collected by the…

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

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

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

Improved measurement of Born cross sections for $\ddot{I}{‡}_{bJ}\ddot{I}‰$ and $\ddot{I}{‡}_{bJ}(\ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0{)}_{\mathrm{non}-\ddot{\mathrm{I}}‰}$ ($J$ = 0, 1, 2) at Belle and Belle II

Belle, Belle II Collaborations, : +424

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

Measurement of the $B^0$ lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +393

We measure the $B^0$ lifetime and flavor-oscillation frequency using $B^0\to D^{(\ast )-}\ddot{I}{€}^{+}$ decays collected by the Belle II experiment in asymmetric-energy $e^{+}{e}^{-}$ collisions prod…

Test of lepton flavor universality with measurements of $R(D^{+})$ and $R(D^{\ast +})$ 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…

Determination of $|V_{cb}|$ using ${\overline{B}}^0\to D^{\ast +}{\ell }^{-}\bar{\hat{I}}{½}_{\ell }$ decays with Belle II

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

We determine the CKM matrix-element magnitude $|V_{cb}|$ using ${\overline{B}}^0\to D^{\ast +}{\ell }^{-}\bar{\hat{I}}{½}_{\ell }$ decays reconstructed in $189{\mathrm{fb}}^{-1}$ of collision data colle…

Measurement of $CP$ asymmetries in $B^0\to K_S^0\ddot{I}{€}^0{\hat{I}}^3$ decays at Belle II

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

We report measurements of time-dependent $CP$ asymmetries in $B^0\to K_S^0\ddot{I}{€}^0{\hat{I}}^3$ decays based on a data sample of $(388\pm 6)\times 10^6$ $B\bar{B}$ events collected at the $Î¥(4…

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

Belle, Belle II Collaboration, : +408

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

Measurement of $CP$ 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 ($CP$) asymmetries in $B^0\to K_S^0{K}_S^0{K}_S^0$ decays. We use $387\times 10^{6}B\bar{B}$ pairs collected at…

Search for Lepton-Flavor-Violating $\ddot{I}„$ 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 $\ddot{I}{„}^{-}\to e^{-}\hat{I}\pm$ and $\ddot{I}{„}^{-}\to \hat{I}{¼}^{-}\hat{I}\pm$ decays, where $\hat{I}\pm$ is an invisible spin-0 boson. The search uses electron-positron collisions at $10.58$ G…

Measurement of the Branching Fraction of $\hat{I}{›}_c^{+}\to p{K}_S^0\ddot{I}{€}^0$ at Belle

The Belle, Belle II Collaborations, : +426

We report a precise measurement of the ratio of branching fractions $\mathcal{B}(\hat{I}{›}_c^{+}\to p{K}_S^0\ddot{I}{€}^0)/\mathcal{B}(\hat{I}{›}_c^{+}\to p{K}^{-}\ddot{I}{€}^{+})$ using 980 fb${}^{-1}$ of $e^{+}{e}^{-}$ data fro…

Measurement of the branching fraction and $CP$ asymmetry of $B^0\to \ddot{I}{€}^0\ddot{I}{€}^0$ decays using $198\times 10^6$ $B\overline{B}$ pairs in Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +425

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

Determination of $|V_{ub}|$ from simultaneous measurements of untagged $B^0\to \ddot{I}{€}^{-}{\ell }^{+}\hat{I}{½}_{\ell }$ and $B^{+}\to \ddot{I}{}^0{\ell }^{+}\hat{I}{½}_{\ell }$ decays

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

We present a measurement of $|V_{ub}|$ from a simultaneous study of the charmless semileptonic decays $B^0\to \ddot{I}{€}^{-}{\ell }^{+}\hat{I}{½}_{\ell }$ and $B^{+}\to \ddot{I}{}^0{\ell }^{+}\hat{I}{½}_{\ell }$, where $\ell =…

First search for $B\to X_s\hat{I}½\bar{\hat{I}}½$ decays

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

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

Observation of $e^{+}{e}^{-}\to \hat{I}\cdot \hat{I}\yen (2S)$ and search for $e^{+}{e}^{-}\to \hat{I}\cdot \hat{I}\yen (1S),{\hat{I}}^3{X}_b$ at $\sqrt{s}$ near 10.75 GeV

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

We present an analysis of the processes $e^{+}{e}^{-}\to \hat{I}\cdot \hat{I}\yen (1S)$, $\hat{I}\cdot \hat{I}\yen (2S)$, and ${\hat{I}}^3{X}_b$ with $X_b\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{‡}_{bJ},\ddot{I}{‡}_{bJ}\to {\hat{I}}^3\hat{I}\yen (1S)$ $(J=1,2)$ reconstructed from $γγπ^+π^…

Measurement of the $\hat{I}{›}_c^{+}$ lifetime

Belle II Collaboration, F. Abudinén, L. Aggarwal +360

An absolute measurement of the $\hat{I}{›}_c^{+}$ lifetime is reported using $\hat{I}{›}_c^{+}\to p{K}^{-}\ddot{I}{€}^{+}$ decays in events reconstructed from data collected by the Belle II experiment at t…

Search for the $e^{+}{e}^{-}\to \hat{I}{\cdot }_b(1S)\ddot{I}‰$ and $e^{+}{e}^{-}\to \ddot{I}{‡}_{b0}(1P)\ddot{I}‰$ processes at $\sqrt{s}=10.745\mathrm{GeV}$

Belle II Collaboration, I. Adachi, L. Aggarwal +419

We search for the $e^{+}{e}^{-}\to \hat{I}{\cdot }_b(1S)\ddot{I}‰$ and $e^{+}{e}^{-}\to \ddot{I}{‡}_{b0}(1P)\ddot{I}‰$ processes at a center-of-mass energy of 10.745 GeV, which is close to the peak of the $\hat{I}\yen (10753)$ state. We use…

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

Belle, Belle II Collaborations, : +446

We report a search for the rare decay $B^{+}\to K^{+}{\tau }^{+}{\tau }^{-}$ using $1.2\times 10^9$ ${\rm Y}(4S)$ mesons produced near threshold in electron-positron collisions and colle…

Determination of the CKM angle $\ddot{I}{•}_3$ from a combination of Belle and Belle II results

Belle, Belle II Collaborations, : +399

We report a determination of the CKM angle $\ddot{I}{•}_3$, also known as ${\hat{I}}^3$, from a combination of measurements using samples of up to 711~fb${}^{-1}$ from the Belle experiment and up to…

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

Belle, Belle II Collaborations, : +422

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

Measurement of decay-time dependent $CP$ violation in $B^0\to K_S^0{K}_S^0{K}_S^0$ using 2019--2021 Belle II data

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

We report a measurement of decay-time dependent $CP$-violating parameters in $B^0\to K_S^0{K}_S^0{K}_S^0$ decays. We use $(198.0\pm 3.0)\times 10^{6}B\overline{B}$ pairs c…

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

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

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

Measurement of $CP$ asymmetries in $B^0\to \hat{I}{\cdot }^{\prime }{K}_s^0$ decays at Belle II

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

We describe a measurement of charge-parity ($CP$) violation asymmetries in $B^0\to \hat{I}{\cdot }^{\prime }{K}_S^0$ decays using Belle II data. We consider $\hat{I}{\cdot }^{\prime }\to \hat{I}\cdot (\to {\hat{I}}^3{\hat{I}}^3)\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ and $η'\toρ(\toπ^…

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

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

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

Search for lepton flavor-violating decay modes $B^0\to K_S^0\ddot{I}{„}^{\pm }{\ell }^{\mp }(\ell =\hat{I}¼,e)$ 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 $B^0\to K_S^0\ddot{I}{„}^{\pm }{\ell }^{\mp }(\ell =\hat{I}¼,e)$ using the 711 fb${}^{-1}$ and 365 fb${}^{-1}$ data samples…

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

Belle, Belle II Collaborations, : +396

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

Measured and projected beam backgrounds in the Belle II experiment at the SuperKEKB collider

A. Natochii, T. E. Browder, L. Cao +43

The Belle II experiment at the SuperKEKB electron-positron collider aims to collect an unprecedented data set of $50{\mathrm{ab}}^{-1}$ to study $CP$-violation in the $B$-meson system…

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

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

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

Observation of the radiative decay $D_s(2317{)}^{+}\to D_s^{\ast }{\hat{I}}^3$

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

We observe the radiative decay $D_{s0}^{\ast }(2317{)}^{+}\to D_s^{\ast +}{\hat{I}}^3$ for the first time, with a significance exceeding $10$ standard deviations. The signal is found in the conti…

Measurement of the branching fractions of $\bar{B}\to D^{(\ast )}{K}^{-}{K}_{(S)}^{(\ast )0}$ and $\bar{B}\to D^{(\ast )}{D}_s^{-}$ decays at Belle II

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

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

Belle II Executive Summary

D. M. Asner, H. Atmacan, Sw. Banerjee +78

Belle II is a Super $B$ Factory experiment, expected to record 50 ab${}^{-1}$ of $e^{+}{e}^{-}$ collisions at the SuperKEKB accelerator until 2035. The large samples of $B$ mesons, charm h…

Combined analysis of Belle and Belle II data to determine the CKM angle $\ddot{I}{•}_3$ using $B^{+}\to D(K_S^0{h}^{-}{h}^{+})h^{+}$ decays

Belle, Belle II Collaborations, : +319

We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle $\ddot{I}{•}_3$ (also known as~${\hat{I}}^3$) using a model-independent Dalitz plot analysis of \linebreak $B^+…

Measurement of the branching fraction, polarization, and time-dependent $CP$ asymmetry in $B^0\to \ddot{I}{}^{+}\ddot{I}{}^{-}$ decays and constraint on the CKM angle $\ddot{I}{•}_2$

Belle II Collaboration, I. Adachi, L. Aggarwal +377

We present a measurement of the branching fraction and fraction of longitudinal polarization of $B^0\to \ddot{I}{}^{+}\ddot{I}{}^{-}$ decays, which have two $\ddot{I}{€}^0$'s in the final state. We also meas…

Search for a $\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ 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 $e^{+}{e}^{-}\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}X$ events in the 0.212-9.000 GeV/$c^2$ mass range, using 178 fb${}^{-1}$ o…

Measurement of the branching fractions and $CP$ asymmetries of $B^{+}\to \ddot{I}{€}^{+}\ddot{I}{€}^0$ and $B^{+}\to K^{+}\ddot{I}{€}^0$ decays in 2019-2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +582

We determine the branching fractions $\mathcal{B}$ and $CP$ asymmetries ${\mathcal{A}}_{CP}$ of the decays $B^{+}\to \ddot{I}{€}^{+}\ddot{I}{€}^0$ and $B^{+}\to K^{+}\ddot{I}{€}^0$. The res…

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

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

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

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

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

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

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

Search for a long-lived spin-0 mediator in $b\to s$ transitions at the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +411

Additional spin-0 particles appear in many extensions of the standard model. We search for long-lived spin-0 particles $S$ in $B$-meson decays mediated by a $b\to s$ quark transiti…

Study of $\hat{I}\yen (10753)$ decays to $\ddot{I}{€}^{+}\ddot{I}{€}^{-}\hat{I}\yen (nS)$ final states at Belle II

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

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

Determination of $|V_{cb}|$ from $B\to D\ell \hat{I}½$ 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 $V_{cb}$ using $B\to D\ell \hat{I}½$ decays. The result is based on $e^{+}{e}^{-}\to \hat{I}\yen (4S)$ dat…

Search for lepton-flavor-violating $\ddot{I}{„}^{-}\to {\ell }^{-}{K}_s^0$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +419

We present the results of a search for charged-lepton-flavor violating decays $\ddot{I}{„}^{-}\to {\ell }^{-}{K}_S^0$, where ${\ell }^{-}$ is either an electron or a muon. We combine $…

Measurement of $CP$ asymmetries in $B^0\to \ddot{I}•K_S^0$ decays with Belle II

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

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

Measurement of the branching fraction and $CP$-violating asymmetry of the decay $B^0\to \ddot{I}{€}^0\ddot{I}{€}^0$ 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 $B^0\to \ddot{I}{€}^0\ddot{I}{€}^0$ decays reconstructed using the Belle II detector in an electro…

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

Belle II Collaboration, F. Abudinén, I. Adachi +357

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

Observation of $B\to D^{(\ast )}{K}^{-}{K}_S^0$ 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 $B^{0,-}\to D^{(\ast )+,0}{K}^{-}{K}_S^0$ 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 $B^{-}\to D^0\ddot{I}(770{)}^{-}$ at Belle II

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

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

Search for Rare $b\to d{\ell }^{+}{\ell }^{-}$ Transitions at Belle

Belle, Belle II Collaborations, : +393

We present the results of a search for the $b\to d{\ell }^{+}{\ell }^{-}$ flavor-changing neutral-current rare decays $B^{+,0}\to (\hat{I}\cdot ,\ddot{I}‰,\ddot{I}{€}^{+,0},\ddot{I}{}^{+,0})e^{+}{e}^{-}$ and $B^{+, 0} \to (…

Measurement of the photon-energy spectrum in inclusive $B\to X_s{\hat{I}}^3$ 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…

Measurement of the inclusive branching fractions for $B_s^0$ decays into $D$ mesons via hadronic tagging

Belle, Belle II Collaborations, : +452

We report measurements of the absolute branching fractions $\mathcal{B}(B_s^0\to D_s^{\pm }X)$, $\mathcal{B}(B_s^0\to D^0/{\bar{D}}^{0}X)$, and $\mathcal{B}(B_s^0\to D^{\pm }X)$, w…

Measurement of decay-time-dependent $\text{CP}$ violation in $B^0\to J/\ddot{I}ˆK_S^0$ decays using 2019-2021 Belle II data

Belle II Collaboration, I. Adachi, L. Aggarwal +392

We report a measurement of the mixing-induced and direct $\text{CP}$ violation parameters $S_{\text{CP}}$ and $A_{\text{CP}}$ from $B^0\to J/\ddot{I}ˆK_S^0$ decays reconstructed by the…

Angular analysis of $B^{+}\to \ddot{I}{}^{+}\ddot{I}{}^0$ decays reconstructed in 2019, 2020, and 2021 Belle II data