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…

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.…

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…

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…

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…

Model-agnostic likelihood for the reinterpretation of the $B^{+}\to K^{+}\hat{I}½\bar{\hat{I}}½$ measurement at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +374

We recently measured the branching fraction of the $B^{+}\to K^{+}\hat{I}½\bar{\hat{I}}½$ decay using 362fb${}^{-1}$ of on-resonance $e^{+}{e}^{-}$ collision data under the assumption of Standar…

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…

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…

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…

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…

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…

Photon Reconstruction in the Belle II Calorimeter Using Graph Neural Networks

F. Wemmer, I. Haide, J. Eppelt +22

We present the study of a fuzzy clustering algorithm for the Belle II electromagnetic calorimeter using Graph Neural Networks. We use a realistic detector simulation including simu…

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…

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 $\ddot{I}„$-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 $\hat{I}{ž}_c^{+}\to \hat{I}{\pounds }^{+}{K}_S^0$, $\hat{I}{ž}_c^{+}\to \hat{I}{ž}^0\ddot{I}{€}^{+}$, 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…

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…

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 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_{\…

Observation of the rare $B_s^0\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}$ decay from the combined analysis of CMS and LHCb data

The CMS, LHCb Collaborations, : +2807

A joint measurement is presented of the branching fractions $B_s^0\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}$ and $B^0\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data…

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 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…

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 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…

HIKE, High Intensity Kaon Experiments at the CERN SPS

E. Cortina Gil, J. Jerhot, N. Lurkin +176

A timely and long-term programme of kaon decay measurements at a new level of precision is presented, leveraging the capabilities of the CERN Super Proton Synchrotron (SPS). The pr…

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 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…

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…

Precise Mirror Alignment and Basic Performance of the RICH Detector of the NA62 Experiment at CERN

G. Anzivino, M. Barbanera, A. Bizzeti +17

The Ring Imaging Cherenkov detector is crucial for the identification of charged particles in the NA62 experiment at the CERN SPS. The detector commissioning was completed in 2016…

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…

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…

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…

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 mixing-induced CP violation in the decay $B^0\to \ddot{I}{€}^0\ddot{I}{€}^0$

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

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

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…

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…

KLEVER: An experiment to measure BR($K_L\to \ddot{I}{€}^0\hat{I}½\bar{\hat{I}}½$) at the CERN SPS

F. Ambrosino, R. Ammendola, A. Antonelli +75

Precise measurements of the branching ratios for the flavor-changing neutral current decays $K\to \ddot{I}€\hat{I}½\bar{\hat{I}}½$ can provide unique constraints on CKM unitarity and, potentially, evide…

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…

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…

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^…

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 $CP$ 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 Measurement of $R(X_{\ddot{I}„/\ell })$ as an Inclusive Test of the $b\to c\ddot{I}„\hat{I}½$ Anomaly

Belle II Collaboration, I. Adachi, K. Adamczyk +390

We measure the tau-to-light-lepton ratio of inclusive $B$-meson branching fractions $R(X_{\ddot{I}„/\ell })\equiv \mathcal{B}(B\to X\ddot{I}„\hat{I}½)/\mathcal{B}(B\to X\ell \hat{I}½)$, where $\ell$ indi…

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…

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…

Study of the a_0(980) meson via the radiative decay phi->eta pi^0 gamma with the KLOE detector

KLOE Collaboration, F. Ambrosino, A. Antonelli +75

We have studied the phi->a_0(980) gamma process with the KLOE detector at the Frascati phi-factory DAPhNE by detecting the phi->eta pi^0 gamma decays in the final states with eta->…

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…

Search for the ${\mathbf{B}}^0\to {\mathbf{K}}_{\mathrm{S}}^0\ddot{\mathbf{I}}{„}^{+}\ddot{\mathbf{I}}{„}^{-}$ decay

Belle, Belle II Collaborations, : +432

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

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…

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…

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

Light Detection System and Time Resolution of the NA62 RICH

G. Anzivino, M. Barbanera, A. Bizzeti +20

A large RICH detector is used in NA62 to suppress the muon contamination in the charged pion sample by a factor of 100 in the momentum range between 15 and 35 GeV/c. Cherenkov ligh…

Search for the baryon number and lepton number violating decays $\ddot{I}{„}^{-}\to \hat{I}›\ddot{I}{€}^{-}$ and $\ddot{I}{„}^{-}\to \bar{\hat{I}}›\ddot{I}{€}^{-}$ at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +371

We present a search for the baryon number $B$ and lepton number $L$ violating decays $\ddot{I}{„}^{-}\to \hat{I}›\ddot{I}{€}^{-}$ and $\ddot{I}{„}^{-}\to \bar{\hat{I}}›\ddot{I}{€}^{-}$ produced from the $e^+e^-\to τ^+Ï…

Search for $K^{+}\to \ddot{I}{€}^{+}\hat{I}½\overline{\hat{I}}½$ at NA62

NA62 Collaboration, G. Aglieri Rinella, R. Aliberti +249

$K^{+}\to \ddot{I}{€}^{+}\hat{I}½\overline{\hat{I}}½$ is one of the theoretically cleanest meson decay where to look for indirect effects of new physics complementary to LHC searches. The NA62 exp…

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…

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 $…

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

Belle, Belle II Collaborations, : +386

We report the first observation of the two-body baryonic decays $B^{+}\to \hat{I}{\pounds }_c(2455{)}^{++}\overline{\hat{I}}{ž}_c^{-}$ and $B^0\to \hat{I}{\pounds }_c(2455{)}^0\overline{\hat{I}}{ž}_c^0$ with signific…

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