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Measurement of raw asymmetry in $D^{0}\longrightarrow K^{0}_{s}K^{0}_{s}$ decay at Belle IIPublic
The decay $D^{0}\longrightarrow K^{0}_{s}K^{0}_{s}$ is a singly Cabibbo-suppressed transition that involves the interference between $c\overline{u}\longrightarrow s\overline{s}$ and $c\overline{u}\longrightarrow d\overline{d}$ amplitudes, mediated by the exchange of a W boson at the tree level, that can generate CP asymmetries at the 1% level, eve… |
BELLE2-CONF-PROC-2023-033 | - |
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Recent Belle II results on time-dependent CP violation and charmPublic
Analysis of time-dependent CP violation are flagship measurements of the Belle II physics program. We present new results on the effective value of the CKM angle sin2phi1 in b->qqs transitions using the dataset collected between 2019-2022. These modes are sensitive probes of physics beyond the Standard Model (SM). In addition, we discuss world-lea… |
BELLE2-CONF-PROC-2023-032 | - |
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Recent Belle II results on radiative and electroweak penguin decaysPublic
Radiative and electroweak penguin decays are excellent probes for new physics, since they are forbidden at tree level in the Standard Model, and hence any deviation from their predicted branching fractions would be a clear sign of physics processes not accounted for by the theory. In this paper, recent results on radiative and electroweak penguin … |
BELLE2-CONF-PROC-2023-031 | - |
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Belle~II results related to $b \to c$ anomaliesPublic
We report two new measurements for tests of lepton flavor universality between electrons and muons using semileptonic $B$ decays with a data set of $189~\mathrm{fb}^{-1}$ collected at the Belle II experiment between 2019 and 2021. Firstly, we find a ratio of inclusive branching fractions at $R(X_{e/\mu}) \equiv \mathcal{B}(\overline{B} \rightarrow… |
BELLE2-CONF-PROC-2023-029 | - |
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Search for the decay $B \rightarrow D^* \eta \pi$ in Belle IIPublic
Recent measurements of semileptonic decays show a difference between the branching ratio of the sum of exclusive decay rates and the inclusive $b \rightarrow c \ell \nu$ decay rate (the so-called Semi-Leptonic (SL) gap) which affects the interpretation of the CKM element $|Vcb|$. Large contributions from not-yet measured $B \rightarrow D^* \eta \e… |
BELLE2-CONF-PROC-2023-028 | - |
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Charged Particle Identification Performances in Belle IIPublic
An efficient Particle identification(PID) is crucial for Belle II as it deals with a much higher event rate than Belle and ultimately with a more extensive background. PID is advantageous in suppressing background, studying rare decays, and for the flavor tagging of B-mesons. We study the charged Kaon and Pion identification performances based on … |
BELLE2-CONF-PROC-2023-027 | - |
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Charged Particle Identification with the TOP detector at Belle IIPublic
The Belle II detector is located at the SuperKEKB energy-asymmetric $e^{+}$-$e^{-}$ collider and has acquired the world’s highest instantaneous luminosity this year. Charged particle identification (PID) in Belle II is provided by the TOP (Time Of Propagation) counters in the barrel region. We report the overall and TOP-focused PID performance in … |
BELLE2-CONF-PROC-2023-026 | - |
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Recent BelleII results on BSM physicsPublic
We report on recent results obtained by the Belle II experiment related to searches for beyond the standard model physics. The B meson decay data sample used corresponds to an integrated luminosity of $L = 189$ fb$^{-1}$. In recent years, discrepancies from standard-model predictions, which suggest violation of lepton-flavor universality, have eme… |
BELLE2-CONF-PROC-2023-019 | - |
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Recent Belle II results on hadronic B decaysPublic
We report on recent measurements of $B$ meson decays to hadronic final states using electron-positron collisions at the $\Upsilon(4S)$ resonance collected from 2019 to 2022 by the Belle~II experiment and corresponding to an integrated luminosity of 362 ${\rm fb^{-1}}$. We present new results to determine the quark-mixing parameter $\gamma$, perfor… |
BELLE2-CONF-PROC-2023-018 | - |
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Status and prospects for rare B decays at Belle and Belle IIPublic
Rare $B$ decays are at the front of Belle~II physics program. As the Belle~II experiment concludes three years of data taking, collecting a sample of roughly $\SI{424}{fb^{-1}}$ -- in size comparable to BaBar's and around half of Belle's --, first results on rare $B$ decays have already been shown since 2021. The latest is the inclusive $\mathcal{… |
BELLE2-CONF-PROC-2023-017 | - |
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Studies on $\tau$ decays at Belle IIPublic
Tau leptons offer a very clean environment to study the process of hadronization and are powerful tools to probe physics beyond the Standard Model (SM), which might be enhanced due to mass-dependent couplings. The Belle II experiment, installed at SuperKEKB asymmetric energy electron-positron collider, will collect the world’s largest sample of ta… |
BELLE2-CONF-PROC-2023-016 | - |
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Electroweak penguins and radiative B decays at Belle IIPublic
Decays of B mesons involving the transition of a b quark into an s quark are good probes of physics beyond the standard model. Such decays are studied at the Belle II experiment, a detector located along the SuperKEKB electron-positron collider, and with data corresponding to an integrated luminosity of 189 fb−1 collected at the energy of the Υ(4S… |
BELLE2-CONF-PROC-2023-015 | - |
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Semileptonic $B$-meson decays including $b \rightarrow c$ anomalies at Belle IIPublic
We present recent measurements of semileptonic $B$-meson decays using a data sample collected at the $\Upsilon(4S)$ resonance by the Belle~II experiment corresponding to an integrated luminosity of $189\,\mathrm{fb}^{-1}$. We determine the CKM-matrix elements $V_\mathrm{cb}$ using untagged $B^0 \to D^{*-} \, \ell^{+} \, \nu_\ell$ decays and $V_\ma… |
BELLE2-CONF-PROC-2023-014 | - |
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Quarkonium and charm at Belle II Public
We present recent results from the Belle II experiment related to quarkonium and charm physics. With data samples collected by Belle II during special operations of the SuperKEKB collider above the $\Upsilon(4S)$ resonance, we study the processes $e^+e^- \to \omega\chi_{bJ}(1P)$ ($J=0$, 1, or 2), search for the bottomonium equivalent of the X(3872… |
BELLE2-CONF-PROC-2023-013 | - |
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Time-dependent CP violation results at Belle IIPublic
We report updates on time-dependent CP-violation observables at Belle II. The benchmark measurements of the B0 lifetime τB0 and mixing frequency ∆md using flavor specific hadronic decays and the determination of the CP-violating phase sin2φ1 in b → ccs transitions have been performed using data collected between 2019–2021. These analyses use only … |
BELLE2-CONF-PROC-2023-012 | - |
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Hadronic $B$ decays and charm at Belle IIPublic
We report the measurements of various hadronic $B$ decays and charm at the Belle II experiment using a $362\invfb$ sample of electron-positron collisions collected at the $\FourS$ resonance. All results are competitive with the previous determination, and some of them are already competitive with the world's best measurement. |
BELLE2-CONF-PROC-2023-011 | - |
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Dark sectors and τ physics at Belle IIPublic
The possibility of dark sectors weakly coupling to Standard Model (SM) particles through new light mediators is explored at the Belle II experiment. We present here results from three different searches, for a long-lived (pseudo)scalar particle; for a di-tau resonance in four-muon final states events and the update on the search for a Z′ boson dec… |
BELLE2-CONF-PROC-2023-010 | - |
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| Searches for light dark sectors at Belle II, Belle, and BaBarPublic | BELLE2-CONF-PROC-2023-009 | - | ||
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Recent results from Belle IIPublic
The Belle II experiment at the SuperKEKB energy-asymmetric e+e− collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is 6 · 1035 cm−2s−1 and the Belle II experiment aims to ultimately record 50 ab−1 of data, a factor of 50 more than its predecessor. With this data set, Bel… |
BELLE2-CONF-PROC-2023-008 | - |
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Time-dependent, hadronic B decays and electroweak penguins at Belle IIPublic
We report the recent measurements performed using the data sample collected from 2019 to 2022 by the Belle II experiment 1 at Υ(4S) resonance, corresponding to an integrated luminosity of 362 fb−1 . We present the measurement of B lifetime and mixing frequency, the time dependent CP-violation analyses using the B0 → JψKS0 , B0 → φKS0 , B0 → KS0 KS… |
BELLE2-CONF-PROC-2023-007 | - |
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