I. Peruzzi

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

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

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

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

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

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

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

Belle II collaboration, F. AbudinÃ©n, I. Adachi +385

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Belle, Belle II Collaborations, : +366

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

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

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

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

A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \to X ℓ I^½$ decays

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +540

Tag-side reconstruction is an important method for reconstructing $B$ meson decays with missing energy. The Belle II tag-side reconstruction algorithm, Full Event Interpretation, r…

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

Belle II collaboration, F. AbudinÃ©n, I. Adachi +549

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

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

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

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

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. AbudinÃ©n, I. Adachi +549

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

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

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

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

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

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

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

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

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

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

Search for the lepton-flavor-violating $I ¨ ^{-} \to e^{\mp} ℓ^{\pm} ℓ^{\mp}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +447

We present the result of a search for the charged-lepton-flavor violating decays $I ¨ ^{-} \to e^{\mp} ℓ^{\pm} ℓ^{-}$ , where $ℓ$ is a muon or an electron, using a data sampl…

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

The Belle, Belle II Collaborations, : +427

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

Exclusive $B \to X_{u} ℓ I^½_{ℓ}$ Decays with Hadronic Full-event-interpretation Tagging in 62.8 fb $^{- 1}$ of Belle II Data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +565

We present a reconstruction in early data of the semileptonic decay $B^{+} \to I ¨ ^{0} ℓ^{+} I^½_{ℓ}$ , and first results of a reconstruction of the decays $B^{+} \to I ¨ ^{0} ℓ^{+} I^½_{ℓ}$ …

Search for Axion-Like Particles produced in $e^{+} e^{-}$ collisions at Belle II

Belle II collaboration, F. Abudinen, I. Adachi +334

We present a search for the direct production of a light pseudoscalar $a$ decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process…

hep-ex2019

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +420

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

Measurement of the $I^c ◯_{c}^{0}$ lifetime at Belle II

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +353

We report on a measurement of the $I^c ◯_{c}^{0}$ lifetime using $I^c ◯_{c}^{0} \to I^c ◯^{-} I ¨ ^{+}$ decays reconstructed in $e^{+} e^{-} \to c c ˉ$ data collected by the Belle II experiment and correspon…

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +551

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

$I ¨ $ lepton mass measurement at Belle II

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +539

The reconstruction of tau-pair production, $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-}$ , from the subsequent 3-prong ( $I ¨ ^{+} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{+} I^ˉ ½_{I ¨} $ ) and 1-prong ($Ï^{-} \to…

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

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

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

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

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

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

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

Belle, Belle II Collaborations, : +424

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

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +393

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

Test of lepton flavor universality with measurements of $R (D^{+})$ and $R (D^{*+})$ using semileptonic $B$ tagging at the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +450

We report measurements of the ratios of branching fractions ${\cal R}(D^{(*)+}) = \frac{{\cal B}(\overline{B}{}^0 \to D^{(*)+} \,Ï^- \, \overlineÎ½_Ï)}{{\cal B}(\overline{B}{}^0…

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

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

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

Observation of $e^{+} e^{-} \to I ¨ I ¨ _{b J} (1 P)$ and search for $X_{b} \to I ¨ I^¥ (1 S)$ at $s$ near 10.75 GeV

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

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

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

Belle, Belle II Collaboration, : +408

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

Charmless $B$ decay reconstruction in 2019 Belle II data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +533

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

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

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

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

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

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

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

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

The Belle, Belle II Collaborations, : +426

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

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

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

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

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +541

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

Rediscovery of $B \to I ¨ K^{()}$ decays and measurement of the longitudinal polarization fraction $f_{L}$ in $B \to I ¨ K^{}$ decays using the Summer 2020 Belle II dataset

F. AbudinÃ©n, 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 $B^{+} \to I ¨ K^{+}$ , $B^+ \to ÏK^{*…

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

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

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

Observations of the singly Cabibbo-suppressed decays $I^_{c}^{+} \to p K_{S}^{0}$ , $I^_{c}^{+} \to I^ I ¨ ^{+}$ , and $I^_{c}^{+} \to I^£^{0} I ¨ ^{+}$ at Belle and Belle II

Belle, Belle II Collaborations, : +345

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

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

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

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

Measurement of the $I^_{c}^{+}$ lifetime

Belle II Collaboration, F. AbudinÃ©n, L. Aggarwal +360

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

Measurement of the branching fraction $B (B ˉ^{0} \to D^{*+} ℓ^{-} I^ˉ ½_{ℓ})$ with early Belle II data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +533

We measure the branching fractions for the decays $B ˉ^{0} \to D^{*+} e^{-} I^ˉ ½_{e}$ and $B ˉ^{0} \to D^{*+} I^¼^{-} I^ˉ ½_{I^} ¼$ using $8.70 \pm 0.09 fb^{- 1}$ of data coll…

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

Belle, Belle II Collaborations, : +422

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

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

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

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

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

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

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

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +584

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

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

Belle, Belle II Collaborations, : +425

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

Measurement of the time-integrated mixing probability $I ¨ _{d}$ with a semileptonic double-tagging strategy and $34.6 fb^{- 1}$ of Belle II collision data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +550

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

Measurement of Hadronic Mass Moments $⟨ M_{X}^{n} ⟩$ in $B \to X_{c} ℓ I^½$ Decays at Belle II

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +540

We present measurements of the first six hadronic mass moments in semileptonic $B \to X_{c} ℓ I^½$ decays. The hadronic mass moments, together with other observables of inc…

Measurement of the $B^{0}$ lifetime using fully reconstructed hadronic decays in the 2019 Belle II dataset

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +534

This document presents the measurement of $B^{0}$ meson lifetimes using the 2019 Belle II dataset that corresponds to an integrated luminosity of $8.7 \pm 0.2$ fb $^{- 1}$ . Each candid…

Search for an invisibly decaying $Z^{'}$ boson at Belle II in $e^{+} e^{-} \to I^¼^{+} I^¼^{-} (e^{\pm} I^¼^{\mp})$ 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 $Z^{'}$ . 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 $B^{0} \to K^{+} I ¨ ^{-}$ , $B^{+} \to K_{S}^{0} I ¨ ^{+}$ and $B^{0} \to I ¨ ^{+} I ¨ ^{-}$ using 2019 and 2020 data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +549

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

Measurement of the branching fraction, polarization, and time-dependent $C P$ asymmetry in $B^{0} \to I ¨ ^{+} I ¨ ^{-}$ decays and constraint on the CKM angle $I ¨ _{2}$

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

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

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +582

We determine the branching fractions $B$ and $C P$ asymmetries $A_{CP}$ of the decays $B^{+} \to I ¨ ^{+} I ¨ ^{0}$ and $B^{+} \to K^{+} I ¨ ^{0}$ . The res…

Measurement of the $D^{0} \to K^{-} I ¨ ^{+} e^{+} e^{-}$ branching fraction and search for $D^{0} \to I ¨ ^{+} I ¨ ^{-} e^{+} e^{-}$ and $D^{0} \to K^{+} K^{-} e^{+} e^{-}$ decays at Belle

Belle, Belle II Collaborations, : +481

We present a study of the rare charm meson decays $D^{0} \to K^{+} K^{-} e^{+} e^{-}$ , $I ¨ ^{+} I ¨ ^{-} e^{+} e^{-}$ , and $K^{-} I ¨ ^{+} e^{+} e^{-}$ using a 942 fb $^{- 1}$ data se…

First flavor tagging calibration using 2019 Belle II data

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +540

We report on the first calibration of the standard Belle II $B$ -flavor tagger using the full data set collected at the $I^¥ (4 S)$ resonance in 2019 with the Belle II detector a…

A test of light-lepton universality in the rates of inclusive semileptonic $B$ -meson decays at Belle II

Belle II Collaboration, L. Aggarwal, H. Ahmed +349

We present the first measurement of the ratio of branching fractions of inclusive semileptonic $B$ -meson decays, $R(X_{e/Î¼}) = \mathcal{B}(B\to X \, e \, Î½) / \mathcal{B}(B\to X…

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

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

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

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

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

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

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…

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

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

Search for lepton-flavor-violating $I ¨ ^{-} \to ℓ^{-} K_{s}^{0}$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +419

We present the results of a search for charged-lepton-flavor violating decays $I ¨ ^{-} \to ℓ^{-} K_{S}^{0}$ , where $ℓ^{-}$ is either an electron or a muon. We combine $…

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

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

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

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

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

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

Measurement of the semileptonic $B ˉ^{0} \to D^{*+} ℓ^{-} I^½_{ℓ}$ 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 $B^{0} ˉ \to D^{*+} ℓ^{-} I^½_{ℓ}$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Int…

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

We present a measurement of the branching fractions of four $B^{0, -} \to D^{(*) +, 0} K^{-} K_{S}^{0}$ decay modes. The measurement is based on data from SuperKEKB electron-positron colli…

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

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

physics.ins-det2013

SuperB Technical Design Report

SuperB Collaboration, M. Baszczyk, P. Dorosz +406

In this Technical Design Report (TDR) we describe the SuperB detector that was to be installed on the SuperB e+e- high luminosity collider. The SuperB asymmetric collider, which wa…

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 photon-energy spectrum in inclusive $B \to X_{s} I^^{3}$ decays identified using hadronic decays of the recoil $B$ meson in 2019-2021 Belle II data

We measure the photon-energy spectrum in radiative bottom-meson ( $B$ ) decays into inclusive final states involving a strange hadron and a photon. We use SuperKEKB electron-positron…

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

This paper reports a study of $B \to K^{*} I^^{3}$ 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 $B^{0} \to J / I ¨ K_{L}^{0}$ at Belle II

We present preliminary results on the reconstruction of the $B^{0} \to J / I ¨ K_{L}^{0}$ decay, where $J / I ¨ \to I^¼^{+} I^¼^{-}$ or $…

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

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

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

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

We report on a Belle II measurement of the branching fraction ( $B$ ), longitudinal polarization fraction ( $f_{L}$ ), and CP asymmetry ( $A_{C P}$ ) of $B^+\to Ï^+Ï^0…

First search for direct $C P$ -violating asymmetry in $B^{0} \to K^{0} I ¨ ^{0}$ decays at Belle II

We report on the first measurement of the direct $C P$ -violating asymmetry ( $A$ ) in the charmless decay $B^{0} \to K^{0} I ¨ ^{0}$ at Belle II and an updated measurement of its bra…

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

This note describes the rediscovery of $B \to I^\cdot^{'} K$ decays in Belle II data, both in the charged and neutral final state: $B_{0} \to I^\cdot^{'} K_{S}$ and $B^{\pm} \to I^\cdot^{'} K^{\pm}$ . The $I^\cdot^{'}$ is searc…

Studies of the semileptonic $B ˉ^{0} \to D^{*+} ℓ^{-} I^ˉ ½_{ℓ}$ and $B^{-} \to D^{0} ℓ^{-} I^ˉ ½_{ℓ}$ decay processes with 34.6 fb $^{- 1}$ of Belle II data

We report measurements of the $B ˉ^{0} \to D^{*+} ℓ^{-} I^ˉ ½_{l}$ and $B^{-} \to D^{0} ℓ^{-} I^ˉ ½_{l}$ processes using 34.6 fb $^{- 1}$ of collision events recorded by the Bell…

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

We report measurements of branching fractions ( $B$ ) and direct $CP$ -violating asymmetries ( $A_{CP}$ ) for the decays $B^{+} \to K^{+} I ¨ ^{0}$ and $B^+ \to Ï^+Ï…

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

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

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

We report on first measurements of branching fractions~( $B$ ) and CP-violating charge asymmetries~( $A$ ) in charmless $B$ decays at Belle~II. We use a sample of e…

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 $e^{+} e^{-} \to c c$ events collected by the Belle a…

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

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

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

Search for a $I ¨ ^{+} I ¨ ^{-}$ resonance in $e^{+} e^{-} \to I^¼^{+} I^¼^{-} I ¨ ^{+} I ¨ ^{-}$ 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 $I ¨ $ pairs in $e^{+} e^{-} \to I^¼^{+} I^¼^{-} I ¨ ^{+} I ¨ ^{-}$ events in the 3.6-10 GeV/ $c^{2}$ mass range.…

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

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

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

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

We measure the CP asymmetry in $D^{+} \to I ¨ ^{+} I ¨ ^{0}$ 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 $∣ V_{c b} ∣$ using $B \to D ℓ I^½_{ℓ}$ Decays at Belle II

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

We present a determination of the Cabibbo-Kobayashi-Maskawa matrix element $∣ V_{c b} ∣$ from the decay $B \to D ℓ I^½_{ℓ}$ using a $365 fb^{- 1}$ $e^{+} e^{-} \to I^¥ (4 S) \to B B ˉ$ …