S. Longo

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

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

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

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

Belle, Belle II Collaborations, : +407

We report the result of a search for the rare decay $B^{0} \to I^^{3} I^^{3}$ using a combined dataset of $753 \times 1 0^{6}$ $B B ˉ$ pairs collected by the Belle experiment and $387\times…

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…

physics.ins-det2022

Energetic neutron identification with pulse shape discrimination in pure CsI crystals

S. Longo, M. Khan, S. Dharani +2

Pulse shape discrimination with pure CsI scintillators is investigated as a method for separating energy deposits by energetic neutrons and photons at particle physics experiments.…

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

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

We search for the $e^{+} e^{-} \to I^^{3} I ¨ _{b J}$ ( $J$ = 0, 1, 2) processes at center-of-mass energies $s$ = 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 $e^{+} e^{-} \to h^{+} h^{-} J / I ¨ (h = I ¨ , K, p)$ 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 $I^¥ (4 S)$ and $I^¥ (10753)$ resonances, the cross sections for $e^{+} e^{-} \to h^{+} h^{-} J / I ¨ $ $(h=Ï/K…

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

Search for axion-like particles decaying to two photons at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +450

Axion-like particles (ALPs) are predicted in many extensions of the Standard Model and provide a well-motivated portal between visible and hidden sectors through their coupling to…

First measurements of the branching fractions for the decay modes $I^_{c}^{0} \to I^ I^\cdot$ and $I^_{c}^{0} \to I^ I^\cdot^{'}$ and search for the decay $I^_{c}^{0} \to I^ I ¨ ^{0}$ 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 $Î_c^{0} \to…

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 $C P$ asymmetry in $D^{0} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ decays at Belle II

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

We measure the time- and phase-space-integrated $C P$ asymmetry $A_{C P}$ in $D^{0} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ decays reconstructed in $e^{+} e^{-} \to c c ˉ$ events collected by the Belle II experim…

Measurement of the integrated luminosity of data samples collected during 2019-2022 by the Belle II experiment

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

A series of data samples was collected with the Belle~II detector at the SuperKEKB collider from March 2019 to June 2022. We determine the integrated luminosities of these data sam…

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

nucl-ex2026

Initial results of the TRIUMF ultracold advanced neutron source

B. Algohi, D. Anthony, L. BarrÃ³n-Palos +83

We report the first results on ultracold neutron production from a new spallation-driven superfluid $^{4}$ He (He-II) source at TRIUMF, which is being prepared for a new, precise meas…

New graph-neural-network flavor tagger for Belle II and measurement of $sin 2 I ¨ _{1}$ in $B^{0} \to J / I ¨ K_{S}^{0}$ 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 $I^¥ (4 S)$ decays. It improves previous algorithms by usi…

A search for feebly-interacting particles in $B$ decays with missing energy at Belle

Belle, Belle II Collaborations, : +406

We present a search for an invisible hidden-sector particle $X_{inv}$ , produced in $B^{0} \to D ˉ^{0} X_{inv}$ and $B^{\pm} \to h X_{inv}$ decays, where $h = I ¨ ^{\pm}$ ,…

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 $B^{+} \to I ¨ ^{0} ℓ^{+} I^½_{ℓ}$ …

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…

physics.ins-det2026

Ultracold Neutron Guide-Coating Facility at U.Winnipeg

T. Hepworth, A. Zahra, B. Algohi +72

We report the construction and commissioning of a new ultracold neutron (UCN) guide-coating facility at the University of Winnipeg. The facility employs pulsed laser deposition (PL…

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…

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…

physics.plasm-ph2023

Lessons learned after three years of SPIDER operation and the first MITICA integrated tests

D. Marcuzzi, V. Toigo, M. Boldrin +139

ITER envisages the use of two heating neutral beam injectors plus an optional one as part of the auxiliary heating and current drive system. The 16.5 MW expected neutral beam power…

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,…

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 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…

quant-ph2008

Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature

A. Vinante, M. Bignotto, M. Bonaldi +13

We apply a feedback cooling technique to simultaneously cool the three electromechanical normal modes of the ton-scale resonant-bar gravitational wave detector AURIGA. The measurin…

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^{*…

Determination of $∣ V_{u b} ∣$ from simultaneous measurements of untagged $B^{0} \to I ¨ ^{-} ℓ^{+} I^½_{ℓ}$ and $B^{+} \to I ¨ ^{0} ℓ^{+} I^½_{ℓ}$ decays

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

We present a measurement of $∣ V_{u b} ∣$ from a simultaneous study of the charmless semileptonic decays $B^{0} \to I ¨ ^{-} ℓ^{+} I^½_{ℓ}$ and $B^{+} \to I ¨ ^{0} ℓ^{+} I^½_{ℓ}$ , where $\ell =…

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^…

First measurement of the masses of the $I^¥_{1} (1 D)$ and $I^¥_{3} (1 D)$ states and the energy dependence of the cross sections for $e^{+} e^{-} \to I^¥_{J} (1 D) I^\cdot$ and $e^{+} e^{-} \to I^¥_{J} (1 D) I ¨ ^{+} I ¨ ^{-}$

Belle, Belle II Collaborations, : +398

We study the processes $e^{+} e^{-} \to I^¥_{J} (1 D) I^\cdot$ and $e^{+} e^{-} \to I^¥_{J} (1 D) I ¨ ^{+} I ¨ ^{-}$ at center-of-mass energies $s$ =(10.73 -- 11.02) GeV using a $142.5 fb^{- 1}$ data sampl…

$B$ -flavor tagging at Belle II

F. AbudinÃ©n, N. Akopov, A. Aloisio +118

We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( $B$ ) mesons at Belle II. The algorithms provide essential inputs for measureme…

physics.ins-det2020

CsI(Tl) Pulse Shape Discrimination with the Belle II Electromagnetic Calorimeter as a Novel Method to Improve Particle Identification at Electron-Positron Colliders

S. Longo, J. M. Roney, C. Cecchi +15

This paper describes the implementation and performance of CsI(Tl) pulse shape discrimination for the Belle II electromagnetic calorimeter, representing the first application of Cs…

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…

Measurement of $C P$ asymmetries in $B^{0} \to I^\cdot^{'} K_{s}^{0}$ decays at Belle II

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

We describe a measurement of charge-parity ( $C P$ ) violation asymmetries in $B^{0} \to I^\cdot^{'} K_{S}^{0}$ decays using Belle II data. We consider $I^\cdot^{'} \to I^\cdot (\to I^^{3} I^^{3}) I ¨ ^{+} I ¨ ^{-}$ and $Î·'\toÏ(\toÏ^…

First evidence of $X (3872) \to I ¨ ^{0} I ¨ _{c 0} (1 P)$ and search for $X (3915) \to I ¨ ^{0} I ¨ _{c 1} (1 P)$

Belle, Belle II Collaborations, : +412

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

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…

Observation of the radiative decay $D_{s} (2317)^{+} \to D_{s}^{*} I^^{3}$

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

We observe the radiative decay $D_{s 0}^{*} (2317)^{+} \to D_{s}^{*+} I^^{3}$ for the first time, with a significance exceeding $10$ standard deviations. The signal is found in the conti…

Search for an invisibly decaying $Z^{'}$ 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…

The Belle II Detector Upgrades Framework Conceptual Design Report

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

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

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…

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

physics.ins-det2026

Neutron EDM Experiment with an Advanced Ultracold Neutron Source at TRIUMF

T. Higuchi, B. Algohi, D. Anthony +67

The TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration has been developing a high-intensity ultracold neutron (UCN) source aimed at searching for the neutron electric dipole m…

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…

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…

Study of $I^¥ (10753)$ decays to $I ¨ ^{+} I ¨ ^{-} I^¥ (n S)$ final states at Belle II

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

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

physics.plasm-ph2007

Non equilibrium velocity distributions of H- ions in H2 plasmas and photodetachment measurements

P. Diomede, S. Longo, M. Capitelli

A theoretical study of the energy distribution function of the negative hydrogen ion H- in typical conditions for multicusp ion sources is presented. The case of H/H2 mixture is st…

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

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

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…

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…

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +357

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

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +575

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +377

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 branching fraction of the decay $B^{-} \to D^{0} I ¨ (770)^{-}$ at Belle II

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

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

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

F. AbudinÃ©n, I. Adachi, R. Adak +565

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +545

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 $…

gr-qc2010

IGEC2: A 17-month search for gravitational wave bursts in 2005-2007

P. Astone, L. Baggio, M. Bassan +50

We present here the results of a 515 days long run of the IGEC2 observatory, consisting of the four resonant mass detectors ALLEGRO, AURIGA, EXPLORER and NAUTILUS. The reported res…

Search for $C P$ violation in $I^_{c}^{+} \to I^£^{+} h^{+} h^{-}$ and $I^_{c}^{+} \to p h^{+} h^{-}$ at Belle II

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

We report decay-rate $C P$ asymmetries of the singly-Cabibbo-suppressed decays $I^_{c}^{+} \to I^£^{+} h^{+} h^{-}$ and $I^_{c}^{+} \to p h^{+} h^{-}$ , with $h = K, I ¨ $ , measured using 428 fb $^{- 1}$ of $e^{+} e^{-}$ …

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +545

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

Belle II Collaboration, F. AbudinÃ©n, I. Adachi +542

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…

physics.ins-det2026

A New High-Intensity Source for Ultracold Neutrons

K. Abe, S. Ahmed, B. Algohi +77

The TRIUMF UltraCold Advanced Neutron (TUCAN) collaboration has completed a new superthermal source for ultracold neutrons (UCNs) at TRIUMF. It uses neutrons from a spallation targ…

Study of $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I^¥ (1 D)$ at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +404

The bottomonium spectrum, consisting of bound states of a $b$ quark and an anti- $b$ quark, provides an excellent laboratory for probing quantum chromodynamics in the non-perturbati…

Measurements of branching fractions and direct $CP$ -violating asymmetries in $B^+ \to K^+ Ï^0~\mbox{and}~Ï^+ Ï^0$ 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…

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…

Observation of the decays $B^{+} \to I^£_{c} (2455)^{++} I^ˉ _{c}^{' -}$ and $B^{0} \to I^£_{c} (2455)^{0} I^ˉ _{c}^{'0}$

Belle, Belle II Collaborations, : +403

We report the first observation of the decays $B^{+} \to I^£_{c} (2455)^{++} I^ˉ _{c}^{' -}$ and $B^{0} \to I^£_{c} (2455)^{0} I^ˉ _{c}^{'0}$ , with significances of $6.4\,…

Test of light-lepton universality in $I ¨ $ decays with the Belle II experiment

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

We present a measurement of the ratio $R_{I^} ¼ = B (I ¨ ^{-} \to I^¼^{-} I^ˉ ½_{I^} ¼ I^½_{I ¨} ) / B (I ¨ ^{-} \to e^{-} I^ˉ ½_{e} I^½_{I ¨} )$ of branching fractions $B$ of the $I ¨ $ lepto…

Search for Pcs(4459) and Pcs(4338) in Upsilon(1S,2S) inclusive decays at Belle

I. Adachi, L. Aggarwal, H. Ahmed +402

Using data samples of 102 million Upsilon(1S) events and 158 million Upsilon(2S) events collected by the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider, we search f…

Model-independent measurement of $D^{0}$ - $D^{0}$ mixing parameters in $D^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-}$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +339

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

Measurement of time-dependent $C P$ asymmetries in $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-} I^^{3}$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +350

We present a measurement of the time-dependent $C P$ asymmetry in $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-} I^^{3}$ decays using a data set of 365 fb $^{- 1}$ recorded by the Belle II experim…

Novel method for the identification of the production flavor of neutral charmed mesons

Belle II Collaboration, I. Adachi, L. Aggarwal +396

We propose a new algorithm for the identification of the production flavor of neutral $D$ mesons in the Belle II experiment. The algorithm exploits the correlation between the flav…

Searches for charged-lepton-flavor violation in $I ¨ _{b J} (1 P)$ decays

Belle, Belle II Collaborations, : +415

We report the first searches for charged-lepton-flavor violation in decays of $I ¨ _{b J} (1 P)$ ( $J = 0, 1,$ and $2$ ) to a pair of charged leptons using 158 million $I^¥ (2 S)$ decays colle…

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 $B^{0} \to K^{0} I ¨ ^{0}$ ,…

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

Belle, Belle II Collaborations, : +412

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

physics.plasm-ph2012

Monte Carlo calculation of the translational relaxation of superthermal H atoms in thermal H2 gas

A. Panarese, S. Longo

We propose a simple and reliable method to study the translational relaxation of 'hot' H atoms following their production by chemical mechanisms. The problem is relevant to PDR's,…

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

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 the time-integrated $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays using opposite-side flavor tagging at Belle and Belle II

Belle, Belle II Collaborations, : +378

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

physics.ins-det2018

First Measurements of Beam Backgrounds at SuperKEKB

P. M. Lewis, I. Jaegle, H. Nakayama +67

The high design luminosity of the SuperKEKB electron-positron collider is expected to result in challenging levels of beam-induced backgrounds in the interaction region. Properly s…

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 $B \to X_{u} ℓ I^½$ partial branching fractions and $∣ V_{u b} ∣$ at Belle II

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

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

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…

physics.ins-det2025

Cryogenic systems for the TUCAN EDM experiment

Jeffery W. Martin, B. Algohi, D. Anthony +60

The TUCAN (TRIUMF UltraCold Advanced Neutron) Collaboration is completing a new ultracold neutron (UCN) source. The UCN source will deliver UCNs to a neutron electric dipole moment…

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…

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…

quant-ph2010

Quantum Zeno effect in a multilevel molecule

D. Bruno, P. Facchi, S. Longo +3

We study the dynamics of the populations of a model molecule endowed with two sets of rotational levels of different parity, whose ground levels are energy degenerate and coupled b…

Measurements of the branching fractions of $I^_{c}^{+} \to I^£^{+} K_{S}^{0}$ , $I^_{c}^{+} \to I^^{0} I ¨ ^{+}$ , and $I^_{c}^{+} \to I^^{0} K^{+}$ at Belle and Belle II

Belle, Belle II Collaborations, : +357

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

Search for $C P$ 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

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…