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…

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

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

We search for the $e^{+}{e}^{-}\to {\hat{I}}^3\ddot{I}{‡}_{bJ}$ ($J$ = 0, 1, 2) processes at center-of-mass energies $\sqrt{s}$ = 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 $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\ddot{I}ˆ(h=\ddot{I}€,K,p)$ 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…

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…

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 $\hat{I}{ž}_c^0\to \hat{I}›\hat{I}\cdot$ and $\hat{I}{ž}_c^0\to \hat{I}›\hat{I}{\cdot }^{\prime }$ and search for the decay $\hat{I}{ž}_c^0\to \hat{I}›\ddot{I}{€}^0$ 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 $Ξ_c^{0} \to…

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

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

We measure the time- and phase-space-integrated $CP$ asymmetry $A_{CP}$ in $D^0\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$ decays reconstructed in $e^{+}{e}^{-}\to c\bar{c}$ 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…

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…

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…

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 $h=\ddot{I}{€}^{\pm }$,…

Exclusive $B\to X_u\ell \hat{I}{½}_{\ell }$ 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 $B^{+}\to \ddot{I}{€}^0{\ell }^{+}\hat{I}{½}_{\ell }$, and first results of a reconstruction of the decays $B^{+}\to \ddot{I}{}^0{\ell }^{+}\hat{I}{½}_{\ell }$…

Measurement of the branching fraction for $B^0\to \ddot{I}{€}^0\ddot{I}{€}^0$ decays reconstructed in 2019-2020 Belle II data

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

We report the first reconstruction of the $B^0\to \ddot{I}{€}^0\ddot{I}{€}^0$ decay mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8 fb${}^{-1}$ of integrated lumin…

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…

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…

Observation of $e^{+}{e}^{-}\to \ddot{I}‰\ddot{I}{‡}_{bJ}(1P)$ and search for $X_b\to \ddot{I}‰\hat{I}\yen (1S)$ at $\sqrt{s}$ near 10.75 GeV

Belle II collaboration, I. Adachi, L. Aggarwal +348

We study the processes $e^{+}{e}^{-}\to \ddot{I}‰\ddot{I}{‡}_{bJ}(1P)$ ($J$ = 0, 1, or 2) using samples at center-of-mass energies $\sqrt{s}$ = 10.701, 10.745, and 10.805 GeV, corresponding to 1.6, 9.8,…

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 =…

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^…

First measurement of the masses of the $\hat{I}{\yen }_1(1D)$ and $\hat{I}{\yen }_3(1D)$ states and the energy dependence of the cross sections for $e^{+}{e}^{-}\to \hat{I}{\yen }_J(1D)\hat{I}\cdot$ and $e^{+}{e}^{-}\to \hat{I}{\yen }_J(1D)\ddot{I}{€}^{+}\ddot{I}{€}^{-}$

Belle, Belle II Collaborations, : +398

We study the processes $e^{+}{e}^{-}\to \hat{I}{\yen }_J(1D)\hat{I}\cdot$ and $e^{+}{e}^{-}\to \hat{I}{\yen }_J(1D)\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ at center-of-mass energies $\sqrt{s}$=(10.73 -- 11.02) GeV using a $142.5{\mathrm{fb}}^{-1}$ data sampl…

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^…

First evidence of $X(3872)\to \ddot{I}{€}^0\ddot{I}{‡}_{c0}(1P)$ and search for $X(3915)\to \ddot{I}{€}^0\ddot{I}{‡}_{c1}(1P)$

Belle, Belle II Collaborations, : +412

We search for the pionic transitions $X(3872)\to \ddot{I}{€}^0\ddot{I}{‡}_{cJ}(1P)$ $(J=0,1,2)$ and $X(3915)\to \ddot{I}{€}^0\ddot{I}{‡}_{c1}$ in $B^{+}\to \ddot{I}{€}^0\ddot{I}{‡}_{cJ}{K}^{+}$ decays using the Belle and Belle~II data sam…

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…

Measurement of the time-integrated mixing probability $\ddot{I}{‡}_d$ with a semileptonic double-tagging strategy and $34.6{\mathrm{fb}}^{-1}$ of Belle II collision data

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

We present the first measurement of the time-integrated mixing probability $\ddot{I}{‡}_d$ using Belle II data collected at a center-of-mass (CM) energy of 10.58 GeV, corresponding to the m…

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…

The Belle II Detector Upgrades Framework Conceptual Design Report

H. Aihara, A. Aloisio, D. P. Auguste +207

We describe the planned near-term and potential longer-term upgrades of the Belle II detector at the SuperKEKB electron-positron collider operating at the KEK laboratory in Tsukuba…

Measurements of branching fractions and direct CP asymmetries in $B^0\to K^{+}\ddot{I}{€}^{-}$, $B^{+}\to K_{\mathrm{S}}^0\ddot{I}{€}^{+}$ and $B^0\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}$ using 2019 and 2020 data

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

We report updated measurements of branching fractions ($\mathcal{B}$) and CP-violating charge asymmetries (${\mathcal{A}}_{\mathrm{CP}}$) for charmless $B$ decays at Belle II, which opera…

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 $D^0\to K^{-}\ddot{I}{€}^{+}{e}^{+}{e}^{-}$ 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…

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…

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 $B^{+}\to K^{+}\hat{I}½\bar{\hat{I}}½$ decays using an inclusive tagging method at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +377

A search for the flavor-changing neutral-current decay $B^{+}\to K^{+}\hat{I}½\bar{\hat{I}}½$ is performed at the Belle II experiment at the SuperKEKB asymmetric energy electron-positron collide…

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…

Measurements of the branching fractions for $B\to K^{\ast }{\hat{I}}^3$ decays at Belle II

F. Abudinén, I. Adachi, R. Adak +565

This paper reports a study of $B\to K^{\ast }{\hat{I}}^3$ decays using $62.8\pm 0.6$ fb${}^{-1}$ of data collected during 2019--2020 by the Belle II experiment at the SuperKEKB $e^{+}{e}^{-}$ asym…

Rediscovery of $B^0\to J/\ddot{I}ˆK_L^0$ at Belle II

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

We present preliminary results on the reconstruction of the $B^0\to J/\ddot{I}ˆK_L^0$ decay, where $J/\ddot{I}ˆ\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}$ or $…

Search for $CP$ violation in $\hat{I}{ž}_c^{+}\to \hat{I}{\pounds }^{+}{h}^{+}{h}^{-}$ and $\hat{I}{›}_c^{+}\to p{h}^{+}{h}^{-}$ at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +344

We report decay-rate $CP$ asymmetries of the singly-Cabibbo-suppressed decays $\hat{I}{ž}_c^{+}\to \hat{I}{\pounds }^{+}{h}^{+}{h}^{-}$ and $\hat{I}{›}_c^{+}\to p{h}^{+}{h}^{-}$, with $h=K,\ddot{I}€$, measured using 428 fb${}^{-1}$ of $e^{+}{e}^{-}$…

Measurement of the branching fractions of $B\to \hat{I}{\cdot }^{\prime }K$ decays using 2019/2020 Belle II data

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

This note describes the rediscovery of $B\to \hat{I}{\cdot }^{\prime }K$ decays in Belle II data, both in the charged and neutral final state: $B_0\to \hat{I}{\cdot }^{\prime }{K}_S$ and $B^{\pm }\to \hat{I}{\cdot }^{\prime }{K}^{\pm }$. The $\hat{I}{\cdot }^{\prime }$ is searc…

Study of $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\hat{I}\yen (1D)$ 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…

Measurements of branching fractions and direct $CP$-violating asymmetries in $B^+ \to K^+ π^0~\mbox{and}~π^+ π^0$ decays using 2019 and 2020 Belle II data

F. Abudinén, I. Adachi, R. Adak +549

We report measurements of branching fractions ($\mathcal{B}$) and direct $CP$-violating asymmetries (${\mathcal{A}}_{CP}$) for the decays $B^{+}\to K^{+}\ddot{I}{€}^0$ and $B^+ \to π^+π…

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…

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…

Observation of the decays $B^{+}\to \hat{I}{\pounds }_c(2455{)}^{++}\bar{\hat{I}}{ž}_c^{\prime -}$ and $B^0\to \hat{I}{\pounds }_c(2455{)}^0\bar{\hat{I}}{ž}_c^{\prime 0}$

Belle, Belle II Collaborations, : +403

We report the first observation of the decays $B^{+}\to \hat{I}{\pounds }_c(2455{)}^{++}\bar{\hat{I}}{ž}_c^{\prime -}$ and $B^0\to \hat{I}{\pounds }_c(2455{)}^0\bar{\hat{I}}{ž}_c^{\prime 0}$, with significances of $6.4\,…

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…

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 $D^0$-$\overline{D}{}^0$ 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…

Measurement of time-dependent $CP$ asymmetries in $B^0\to K_{\mathrm{S}}^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}{\hat{I}}^3$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +350

We present a measurement of the time-dependent $CP$ asymmetry in $B^0\to K_{\mathrm{S}}^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}{\hat{I}}^3$ 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 $\ddot{I}{‡}_{bJ}(1P)$ 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 $B^0\to K^0\ddot{I}{€}^0$,…

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…

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…

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…

Study of $B\to D^{(\ast )}h$ decays using $62.8{\mathrm{fb}}^{-1}$ 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 $62.8{\mathrm{fb}}^{-1}$ data set collected by the B…

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…

Measurements of the branching fractions of $\hat{I}{ž}_c^{+}\to \hat{I}{\pounds }^{+}{K}_S^0$, $\hat{I}{ž}_c^{+}\to \hat{I}{ž}^0\ddot{I}{€}^{+}$, and $\hat{I}{ž}_c^{+}\to \hat{I}{ž}^0{K}^{+}$ at Belle and Belle II

Belle, Belle II Collaborations, : +357

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

Search for $CP$ violation in $D_{(s)}^{+}\to K_S^0{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{+}$ decays using triple and quadruple products

Belle, Belle II Collaborations, : +366

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

Measurement of the branching fraction of the $B^0\to K_S^0\ddot{I}{€}^0{\hat{I}}^3$ 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_{\…

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

Belle II collaboration, F. Abudinén, I. Adachi +549

We report on the first Belle II measurement of the branching fraction ($\mathcal{B}$) and longitudinal polarization fraction ($f_L$) of $B^{+}\to \ddot{I}{}^{+}\ddot{I}{}^0$ decays. We reconstruct $B^…

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…

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

Belle II collaboration, F. Abudinén, I. Adachi +549

We report on measurements of branching fractions ($\mathcal{B}$) and CP-violating charge asymmetries (${\mathcal{A}}_{\mathrm{CP}}$) of multibody charmless $B$ decays reconstructed by the…

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

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

We measure the branching fraction of the decay $B^0\to J/\ddot{I}ˆ\ddot{I}‰$ 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 $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\ddot{I}{€}^0$, $\hat{I}{ž}_c^0\to \hat{I}{ž}^0\hat{I}\cdot$, 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…

Measurement of $B^{+}\to \ddot{I}{„}^{+}\hat{I}{½}_{\ddot{I}}„$ 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 $B^{+}\to \ddot{I}{„}^{+}\hat{I}{½}_{\ddot{I}}„$ decays using $(387\pm 6)\times 10^6$ $\hat{I}\yen (4S)$ collected between 2019 and 2022 with the Belle II detector at t…

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…

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…

Measurement of the $\hat{I}{\text{c◯}}_c^0$ lifetime at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +353

We report on a measurement of the $\hat{I}{\text{c◯}}_c^0$ lifetime using $\hat{I}{\text{c◯}}_c^0\to \hat{I}{\text{c◯}}^{-}\ddot{I}{€}^{+}$ decays reconstructed in $e^{+}{e}^{-}\to c\bar{c}$ data collected by the Belle II experiment and correspon…

Measurement of time-dependent $CP$ violation parameters in $B^0\to K_S^0\ddot{I}{€}^0{\hat{I}}^3$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +416

We perform a measurement of time-dependent $CP$ violation parameters in $B^0\to K_S^0\ddot{I}{€}^0{\hat{I}}^3$ decays using a dataset of approximately $772\times 10^6$ and $521 \times 10…

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…

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 $CP$ violation and measurement of the branching fraction of $B^0\to J/\ddot{I}ˆ\ddot{I}{€}^0$ decays

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

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

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…

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

Belle, Belle II Collaborations, : +367

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

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

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