Search for the decay $B_s^0\to \ddot{I}{€}^0\ddot{I}{€}^0$ at Belle

Belle Collaboration, J. Borah, B. Bhuyan +211

We report the results of the first search for the decay $B_s^0\to \ddot{I}{€}^0\ddot{I}{€}^0$ using $121.4\mathrm{f}{\mathrm{b}}^{-1}$ of data collected at the $\hat{I}\yen (5\mathrm{S})$ resonance with the Belle detecto…

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…

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…

PCI-express based high-speed readout for the BelleII DAQ upgrade

Q. D. Zhou, S. Yamada, P. Robbe +18

Belle II is a new-generation B-factory experiment, dedicated to exploring new physics beyond the standard model of elementary particles in the flavor sector. Belle~II started data-…

Search for lepton-flavor-violating $\ddot{I}„$ decays into a lepton and a vector meson using the full Belle data sample

Belle Collaboration, N. Tsuzuki, K. Inami +180

Charged-lepton-flavor-violation is predicted in several new physics scenarios. We update the analysis of $\ddot{I}„$ lepton decays into a light charged lepton ($\ell$ = $e^{\pm }$ or $μ^{…

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…

Study of $B^{+}\to p\overline{n}\ddot{I}{€}^0$

Belle Collaboration, K. -N. Chu, Y. -R. Lin +203

We search for the tree-diagram dominated process $B^{+}\to p\overline{n}\ddot{I}{€}^0$, using a data sample of $772\times 10^{6}B\overline{B}$ pairs collected at the $\hat{I}\yen (4S)$ resona…

Measurement of the branching fraction of $\hat{I}{›}_c^{+}\to p\ddot{I}‰$ decay at Belle

Belle Collaboration, S. X. Li, L. K. Li +193

Using 980.6 $\mathrm{f}{\mathrm{b}}^{-1}$ of data collected with the Belle detector operating at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present a measurement of the branching fraction of…

Measurement of the branching fraction of $\hat{I}{ž}_c^0\to \hat{I}{›}_c^{+}\ddot{I}{€}^{-}$ at Belle

Belle Collaboration, S. S. Tang, Y. B. Li +171

Based on a data sample of 983 fb${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present the study of the heavy-flavor-conserving decay…

First measurement of the $B^{+}\to \ddot{I}{€}^{+}\ddot{I}{€}^0\ddot{I}{€}^0$ branching fraction and \textit{CP} asymmetry

Belle Collaboration, Y. -T. Lai, I. Adachi +198

We study $B^{+}\to \ddot{I}{€}^{+}\ddot{I}{€}^0\ddot{I}{€}^0$ using 711 ${\mathrm{fb}}^{-1}$ of data collected at the $\hat{I}\yen (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ colli…

Search for the dark photon in $B^0\to A^{\prime }{A}^{\prime }$, $A^{\prime }\to e^{+}{e}^{-}$, $\hat{I}{¼}^{+}\hat{I}{¼}^{-}$, and $\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ decays at Belle

S. -H. Park, Y. -J. Kwon, I. Adachi +216

We present a search for the dark photon $A^{\prime }$ in the $B^0\to A^{\prime }{A}^{\prime }$ decays, where $A^{\prime }$ subsequently decays to $e^{+}{e}^{-}$, $\hat{I}{¼}^{+}\hat{I}{¼}^{-}$, and $π^+ π^-…

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…

Measurement of the Resonant and Non-Resonant Branching Ratios in $\hat{I}{ž}_c^0\to \hat{I}{ž}^0{K}^{+}{K}^{-}$

J. T. McNeil, J. Yelton, J. Bennett +192

Using the entire data sample of $980$ $f{b}^{-1}$ integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present an amplitude…

Study of $e^{+}{e}^{-}\to \hat{I}\yen (1S,2S)\hat{\mathrm{I}}\cdot$ and $e^{+}{e}^{-}\to \hat{I}\yen (1S)\hat{\mathrm{I}}{\cdot }^{\prime }$ at $\sqrt{s}=10.866$ GeV with the Belle detector

Belle Collaboration, E. Kovalenko, A. Garmash +179

We report the first observation of the processes $e^{+}{e}^{-}\to \hat{I}\yen (1S,2S)\hat{\mathrm{I}}\cdot$ at $\sqrt{s}=10.866$~GeV with a $10.2\ddot{I}ƒ$ and $16.5\ddot{I}ƒ$ significance respectively. The measured Born cross…

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…

Measurements of $q^2$ Moments of Inclusive $B\to X_c{\ell }^{+}\hat{I}{½}_{\ell }$ Decays with Hadronic Tagging

Belle Collaboration, R. van Tonder, L. Cao +202

We present the measurement of the first to fourth order moments of the four-momentum transfer squared, $q^2$, of inclusive $B\to X_c{\ell }^{+}\hat{I}{½}_{\ell }$ decays using the ful…

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 $h=\ddot{I}{€}^{\pm }$,…

$\ddot{I}„$ lepton mass measurement at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +539

The reconstruction of tau-pair production, $e^{+}{e}^{-}\to \ddot{I}{„}^{+}\ddot{I}{„}^{-}$, from the subsequent 3-prong ($\ddot{I}{„}^{+}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^{+}\bar{\hat{I}}{½}_{\ddot{I}}„$) and 1-prong ($τ^{-} \to…

Search for charmed baryons in the $\hat{I}{›}_c^{+}\hat{I}\cdot$ system and measurement of the branching fractions of $\hat{I}{›}_c(2880{)}^{+}$ and $\hat{I}{›}_c(2940{)}^{+}$ decaying to $\hat{I}{›}_c^{+}\hat{I}\cdot$ and $p{D}^0$ relative to $\hat{I}{\pounds }_c(2455)\ddot{I}€$

Belle Collaboration, S. X. Li, C. P. Shen +125

We search for excited charmed baryons in the $\hat{I}{›}_c^{+}\hat{I}\cdot$ system using a data sample corresponding to an integrated luminosity of 980 $\mathrm{f}{\mathrm{b}}^{-1}$. The data were collected by the Be…

Search for lepton-flavor-violating tau-lepton decays to $\ell {\hat{I}}^3$ at Belle

K. Uno, K. Hayasaka, K. Inami +178

Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays $τ^{\pm}\rightarrow…

Search for charged-lepton flavor violation in $\hat{I}\yen (2S)\to {\ell }^{\mp }\ddot{I}{„}^{\pm }$ ($\ell =e,\hat{I}¼$) decays at Belle

R. Dhamija, S. Nishida, A. Giri +178

We report a search for the charged-lepton flavor violation in $\hat{I}\yen (2S)\to {\ell }^{\mp }\ddot{I}{„}^{\pm }$ ($\ell =e,\hat{I}¼$) decays using a $25~\fbi$ $\hat{I}\yen (2S)$ sample collected by the Belle detector at…

Search for the $\hat{I}{\cdot }_{c2}(1D)$ in $e^{+}{e}^{-}\to {\hat{I}}^3\hat{I}{\cdot }_{c2}(1D)$ at $\sqrt{s}$ near 10.6 GeV at Belle

Belle Collaboration, S. Jia, C. P. Shen +198

For the first time we search for the $\hat{I}{\cdot }_{c2}(1D)$ in $e^{+}{e}^{-}\to {\hat{I}}^3\hat{I}{\cdot }_{c2}(1D)$ at $\sqrt{s}$ = 10.52, 10.58, and 10.867 GeV with data samples of 89.5 fb${}^{-1}$, 711 fb${}^{-1}$, and…

Charmless $B$ decay reconstruction in 2019 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +533

We report on the reconstruction of various charmless $B$ decays from electron-positron collisions at the energy corresponding to the $\hat{I}\yen (4S)$ resonance collected with the Belle II…

Measurement of $\mathcal{B}$($B_s\to D_{s}X$) with $B_s$ Semileptonic Tagging

B. Wang, K. Kinoshita, H. Aihara +153

We report the first direct measurement of the inclusive branching fraction $\mathcal{B}(B_s\to D_{s}X)$ via $B_s$ tagging in $e^{+}{e}^{-}\to \hat{I}\yen$(5S) events. Tagging is accomplis…

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…

An improved search for the electric dipole moment of the $\ddot{I}„$ lepton

K. Inami, K. Hayasaka, I. Adachi +181

We report a measurement of the electric dipole moment of the $\ddot{I}„$ lepton ($d_{\ddot{I}}„$) using an 833~fb${}^{-1}$ data sample collected near the $\hat{I}\yen (4S)$ resonance, with the Belle detector…

Rediscovery of $B\to \ddot{I}•K^{(\ast )}$ decays and measurement of the longitudinal polarization fraction $f_L$ in $B\to \ddot{I}•K^{\ast }$ decays using the Summer 2020 Belle II dataset

F. Abudinén, I. Adachi, R. Adak +538

We utilize a sample of 34.6 fb${}^{-1}$, collected by the Belle II experiment at the SuperKEKB asymmetric energy $e^{+}{e}^{-}$ collider, to search for the $B^{+}\to \ddot{I}•K^{+}$, $B^+ \to ϕK^{*…

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 $\hat{I}\text{c◯}(2012{)}^{-}\to \hat{I}ž(1530)\bar{K}$ and measurement of the effective couplings of $\hat{I}\text{c◯}(2012{)}^{-}$ to $\hat{I}ž(1530)\bar{K}$ and $\hat{I}ž\bar{K}$

Belle Collaboration, S. Jia, C. P. Shen +117

Using $\hat{I}\yen (1S)$, $\hat{I}\yen (2S)$, and $\hat{I}\yen (3S)$ data collected by the Belle detector, we discover a new three-body decay, $\hat{I}\text{c◯}(2012{)}^{-}\to \hat{I}ž(1530)\bar{K}\to \hat{I}ž\ddot{I}€\bar{K}$, with a significance of…

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…

Search for an invisibly decaying $Z^{\prime }$ boson at Belle II in $e^{+}{e}^{-}\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}(e^{\pm }\hat{I}{¼}^{\mp })$ plus missing energy final states

Belle II Collaboration, I. Adachi, P. Ahlburg +358

Theories beyond the standard model often predict the existence of an additional neutral boson, the $Z^{\prime }$. Using data collected by the Belle II experiment during 2018 at the…

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…

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…

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…

Study of $\ddot{I}{‡}_{bJ}(2P)\to \ddot{I}‰\hat{I}\yen (1S)$ at Belle

Belle Collaboration, Z. S. Stottler, T. K. Pedlar +179

We report a study of the hadronic transitions $\ddot{I}{‡}_{bJ}(2P)\to \ddot{I}‰\hat{I}\yen (1S)$, with $\ddot{I}‰\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$, using $28.2\times 10^6\hat{I}\yen (3S)$ mesons recorded by the Belle detector. We pres…

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…

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…

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…

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…

Measurement of the semileptonic ${\bar{B}}^0\to D^{\ast +}{\ell }^{-}\hat{I}{½}_{\ell }$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb${}^{-1}$of Belle II data

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

We present a first measurement of the $\overline{B^0}\to D^{\ast +}{\ell }^{-}\hat{I}{½}_{\ell }$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Int…

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…

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 $…

Evidence of $h_b(\text{2P})\to \hat{I}\yen (\text{1S})\hat{I}\cdot$ decay and search for $h_b(\text{1P,2P})\to \hat{I}\yen (\text{1S})\ddot{I}{€}^0$ with the Belle detector

Belle Collaboration, E. Kovalenko, I. Adachi +164

We report the first evidence for the $h_b(\text{2P})\to \hat{I}\yen (\text{1S})\hat{I}\cdot$ transition with a significance of $3.5$ standard deviations. The decay branching fraction is measured to…

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…

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-number- and baryon-number-violating tau decays at Belle

D. Sahoo, G. B. Mohanty, K. Trabelsi +222

We search for lepton-number- and baryon-number-violating decays $\ddot{I}{„}^{-}\to \overline{p}{e}^{+}{e}^{-}$, $p{e}^{-}{e}^{-}$, $\overline{p}{e}^{+}\hat{I}{¼}^{-}$, $\overline{p}{e}^{-}\hat{I}{¼}^{+}$, $\overline{p…

Measurement of the branching fractions for Cabibbo-suppressed decays $D^{+}\to K^{+}{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$ and $D_{(s)}^{+}\to K^{+}\ddot{I}{€}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$ at Belle

Belle Collaboration, L. K. Li, A. J. Schwartz +197

We present measurements of the branching fractions for the singly Cabibbo-suppressed decays $D^{+}\to K^{+}{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$ and $D_s^{+}\to K^{+}\ddot{I}{€}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$, and the doubly…

Search for rare decays $B^{+}\to D_s^{(\ast )+}\hat{I}\cdot$, $D_s^{(\ast )+}{\bar{K}}^0$, $D^{+}\hat{I}\cdot$, and $D^{+}{K}^0$

Belle Collaboration, M. Kumar, V. Bhardwaj +196

We present a study of rare decay modes $B^{+}\to D_s^{+}{h}^0$, $B^{+}\to D_s^{\ast +}{h}^0$, and $B^{+}\to D^{+}{h}^0$, where $h^0$ denotes the neutral mesons $\hat{I}\cdot$ or $K^{…

Search for $CP$ violation in $D_{(s)}^{+}\to K^{+}{K}_S^0{h}^{+}{h}^{-}$ $(h=K,\ddot{I}€)$ decays and observation of the Cabibbo-suppressed decay $D_s^{+}\to K^{+}{K}^{-}{K}_S^0\ddot{I}{€}^{+}$

Belle Collaboration, H. K. Moon, E. Won +205

We search for $CP$ violation by measuring a $T$-odd asymmetry in the Cabibbo-suppressed $D^{+}\to K^{+}{K}_S^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ decay, and in the Cabibbo-favored $D^{+}_{s}\…

Measurement of the $B^{+}/B^0$ production ratio in $e^{+}{e}^{-}$ collisions at the $\hat{I}\yen (4S)$ resonance using $B\to J/\ddot{I}ˆ(\ell \ell )K$ decays at Belle

Belle Collaboration, S. Choudhury, S. Sandilya +197

We measure the ratio of branching fractions for the $\hat{I}\yen (4S)$ decays to $B^{+}{B}^{-}$ and $B^0\bar{B}{}^0$ using $B^{+}\to J/\ddot{I}ˆ(\ell \ell )K^{+}$ and $B^0 \rightarrow J/ψ(\ell\ell)…

Measurement of branching fractions and $CP$ asymmetries for $D_s^{+}\to K^{+}(\hat{I}\cdot ,\ddot{I}{€}^0)$ and $D_s^{+}\to \ddot{I}{€}^{+}(\hat{I}\cdot ,\ddot{I}{€}^0)$ decays at Belle

Belle Collaboration, Y. Guan, A. J. Schwartz +200

We report measurements of the branching fractions and $CP$ asymmetries for $D_s^{+}\to K^{+}\hat{I}\cdot$, $D_s^{+}\to K^{+}\ddot{I}{€}^0$, and $D_s^{+}\to \ddot{I}{€}^{+}\hat{I}\cdot$ de…

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…

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

Belle Collaboration, T. V. Dong, T. Luo +193

This letter presents a search for the rare flavor-changing neutral current process $B^0\to K^{\ast 0}\ddot{I}{„}^{+}\ddot{I}{„}^{-}$ using data taken with the Belle detector at the KEKB as…

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…

Precise measurement of the $D^0$ and $D^{+}$ lifetimes at Belle II

Belle II collaboration, F. Abudinén, I. Adachi +385

We report a measurement of the $D^0$ and $D^{+}$ lifetimes using $D^0\to K^{-}\ddot{I}{€}^{+}$ and $D^{+}\to K^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{+}$ decays reconstructed in $e^{+}{e}^{-}\to c\bar{c}$ data recorded by the Belle II…

Measurements of Partial Branching Fractions of Inclusive $B\to X_u{\ell }^{+}\hat{I}{½}_{\ell }$ Decays with Hadronic Tagging

Belle Collaboration, L. Cao, W. Sutcliffe +236

We present measurements of partial branching fractions of inclusive semileptonic $B\to X_u{\ell }^{+}\hat{I}{½}_{\ell }$ decays using the full Belle data set of 711 fb${}^{-1}$ of integrat…

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 Differential Branching Fractions of Inclusive $B\to X_u{\ell }^{+}\hat{I}{½}_{\ell }$ Decays

Belle Collaboration, L. Cao, W. Sutcliffe +198

The first measurements of differential branching fractions of inclusive semileptonic $B\to X_u{\ell }^{+}\hat{I}{½}_{\ell }$ decays are performed using the full Belle data set of 711 f…

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…

Measurement of branching fractions and search for $CP$ violation in $D^0\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\hat{I}\cdot$, $D^0\to K^{+}{K}^{-}\hat{I}\cdot$, and $D^0\to \ddot{I}•\hat{I}\cdot$ at Belle

Belle Collaboration, L. K. Li, A. J. Schwartz +187

We measure the branching fractions and $CP$ asymmetries for the singly Cabibbo-suppressed decays $D^0\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\hat{I}\cdot$, $D^0\to K^{+}{K}^{-}\hat{I}\cdot$, and $D^0\to \ddot{I}•\hat{I}\cdot$, using 980 fb…

Search for the lepton flavour violating decays $B^{+}\to K^{+}\ddot{I}{„}^{\pm }{\ell }^{\mp }$ ($\ell =e,\hat{I}¼$) at Belle

Belle Collaboration, S. Watanuki, G. de Marino +176

We present a search for the lepton-flavour-violating decays $B^{+}\to K^{+}\ddot{I}{„}^{\pm }{\ell }^{\mp }$, with $\ell =(e,\hat{I}¼)$, using the full data sample of $772\times 10^6$ $B\overline{B}$ pa…

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…

Measurements of the branching fractions of $\hat{I}{ž}_c^0\to \hat{I}›K_S^0$, $\hat{I}{ž}_c^0\to \hat{I}{\pounds }^0{K}_S^0$, and $\hat{I}{ž}_c^0\to \hat{I}{\pounds }^{+}{K}^{-}$ decays at Belle

Belle collaboration, Y. Li, J. X. Cui +213

Using the entire data sample of $980{\mathrm{fb}}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present measurements of the branching f…

Test of lepton flavor universality and search for lepton flavor violation in $B\to K\ell \ell$ decays

S. Choudhury, S. Sandilya, K. Trabelsi +220

We present measurements of the branching fractions for the decays $B\to K\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ and $B\to K{e}^{+}{e}^{-}$, and their ratio ($R_K$), using a data sample of 711 $f{b}^{-1}$ tha…

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…

Evidence of a new excited charmed baryon decaying to $\hat{I}{\pounds }_c(2455{)}^{0,++}\ddot{I}{€}^{\pm }$

Belle Collaboration, Y. B. Li, C. P. Shen +194

We present the study of ${\bar{B}}^0\to \hat{I}{\pounds }_c(2455{)}^{0,++}\ddot{I}{€}^{\pm }\bar{p}$ decays based on $772\times 10^6$ $B\bar{B}$ events collected with the Belle detector at the KEKB as…

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^…

Search for $X(3872)\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$ at Belle

Belle Collaboration, J. H. Yin, E. Won +193

We present a search for the decay $X(3872)\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$ in the $(772\pm 11)\times 10^6$ $\hat{I}\yen (4S)\to B\bar{B}$ data sample collected at the Belle detector, where the $X(3872)$ is…

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…

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 a heavy neutrino in $\ddot{I}„$ decays at Belle

Belle Collaboration, D. Liventsev, I. Adachi +189

We report on a search for a heavy neutrino in the decays $\ddot{I}{„}^{-}\to \ddot{I}{€}^{-}\hat{I}{½}_h$, $\hat{I}{½}_h\to \ddot{I}{€}^{\pm }\ell -+$, $\ell =e,\hat{I}¼$. The results are obtained using the full data sample collect…

Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment

Belle II Collaboration, F. Abudinén, I. Adachi +420

From April to July 2018, a data sample at the peak energy of the $\hat{I}\yen (4S)$ resonance was collected with the Belle~II detector at the SuperKEKB electron-positron collider. This is th…

Search for $h_b(2P)\to {\hat{I}}^3\ddot{I}{‡}_{bJ}(1P)$ at $\sqrt{s}=10.860$ GeV

Belle Collaboration, A. Boschetti, R. Mussa +140

In the bottomonium sector, the hindered magnetic dipole (M1) transitions between P-wave states $h_b(2P)\to \ddot{I}{‡}_{bJ}(1P){\hat{I}}^3$, $J=0,1,2$, are expected to be severely…

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…

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…

Search for $B_s^0\to \hat{I}{\cdot }^{\prime }{X}_{s\bar{s}}$ at Belle using a semi-inclusive method

Belle Collaboration, S. Dubey, T. E. Browder +171

We report the first search for the penguin-dominated process $B_s^0\to \hat{I}{\cdot }^{\prime }{X}_{s\bar{s}}$ using a semi-inclusive method. A 121.4 ${\mathrm{fb}}^{-1}$ integrated l…

Study of $\overline{B}{}^0\to D^{+}{h}^{-}(h=K/\ddot{I}€)$ decays at Belle

Belle Collaboration, E. Waheed, P. Urquijo +205

We present a measurement of the branching fractions of the Cabibbo favored $\overline{B}{}^0\to D^{+}\ddot{I}{€}^{-}$ and the Cabibbo suppressed $\overline{B}{}^0\rightarrow D^{+}K^…

First Determination of the Spin and Parity of a Charmed-Strange Baryon, $\hat{I}{ž}_c(2970{)}^{+}$

Belle Collaboration, T. J. Moon, K. Tanida +202

We report results from a study of the spin and parity of $\hat{I}{ž}_c(2970{)}^{+}$ using a $980\mathrm{f}{\mathrm{b}}^{-1}$ data sample collected by the Belle detector at the KEKB asymmetric-energy $…

Exclusive $B^0\to \ddot{I}{€}^{-}{\ell }^{+}\hat{I}{½}_{\ell }$ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb${}^{-1}$ of Belle II Data

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

We present the results of the re-discovery of the decay $B^0\to \ddot{I}{€}^{-}{\ell }^{+}\hat{I}{½}_{\ell }$ in 34.6 fb${}^{-1}$ of Belle II data using hadronic $B$-tagging via the Full Event Interpretatio…

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…

Observations of the singly Cabibbo-suppressed decays $\hat{I}{ž}_c^{+}\to p{K}_S^0$, $\hat{I}{ž}_c^{+}\to \hat{I}›\ddot{I}{€}^{+}$, and $\hat{I}{ž}_c^{+}\to \hat{I}{\pounds }^0\ddot{I}{€}^{+}$ at Belle and Belle II

Belle, Belle II Collaborations, : +345

Using data samples of 983.0~$\mathrm{f}{\mathrm{b}}^{-1}$ and 427.9~$\mathrm{f}{\mathrm{b}}^{-1}$ accumulated with the Belle and Belle~II detectors operating at the KEKB and SuperKEKB asymmetric-energy $e^{+}{e}^{-}$ c…

Measurement of the branching fractions of the $B^{+}\to \hat{I}\cdot {\ell }^{+}\hat{I}{½}_{\ell }$ and $B^{+}\to \hat{I}{\cdot }^{\prime }{\ell }^{+}\hat{I}{½}_{\ell }$ decays with signal-side only reconstruction in the full $q^2$ range