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Exclusive $B^0 \to \pi^- \ell^+ \nu_\ell$ Decays with Hadronic Full Event Interpretation Tagging in 34.6\invfb of Belle II DataPublic
We present the results of the re-discovery of the decay $B^0 \to \pi^- \ell^+ \nu_\ell$ in 34.6\invfb of Belle II data using hadronic $B$-tagging via the Full Event Interpretation algorithm. We observe 21 signal events on a background of 155 in a fit to the distribution of the square of the missing mass, $M_{\mathrm{miss}}^2$, with a significance … |
BELLE2-CONF-PH-2020-007 | - | 2020-08-05 |
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$\tau$ lepton mass measurement at Belle IIPublic
The reconstruction of tau-pair production, $\epem \to \tau^{+}\tau^{-}$, from the subsequent 3-prong ($\tau^{+} \rightarrow \pi^{+} \pi^{-} \pi^{+} \bar{\nu}_{\tau}$) and 1-prong ($\tau^{-} \to \ell^{-} \bar{\nu}_{\ell} \nu_{\tau}$, $\tau^{-} \to h^{-} \nu_{\tau}$ or $\tau^{-} \to \pi^{-} \pi^0 \nu_{\tau}$) decays, is presented using 8.76~\invfb … |
BELLE2-CONF-PH-2020-010 | - | 2020-08-04 |
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Rediscovery of $B \to \phi K^{(*)}$ decays and measurement of the longitudinal polarization fraction $f_L$ in $B \to \phi K^{*}$ decays using the Summer 2020 Belle II datasetPublic
We utilize a sample of 34.6\invfb, collected by the Belle II experiment at the SuperKEKB asymmetric energy \epem\ collider, to search for the $\Bp \to \phi \Kp$, $\Bp \to \phi \Kstarp$, $\Bz \to \phi \KS$, and $\Bz \to \phi \Kstarz$ decays. Charmless hadronic \B\ decays represent an important part of the Belle II physics program, and are an ideal … |
BELLE2-CONF-PH-2020-006 | - | 2020-07-31 |
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Diversity + Inclusion at Belle IIPublic
The Belle II collaboration comprises over 1000 international high energy physicists, who investigate the properties of b-quarks and other particles at the luminosity frontier. In order to achieve our aim of a successful physics program, it is essential that we enable contributions from a diverse community, whether that be diversity in gender, sexu… |
BELLE2-POSTER-CONF-2020-001 | - | 2020-07-31 |
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Muon and electron identification efficiencies and hadron-lepton mis-identification probabilitiesPublic
In this note we show the performance of Belle II electron and muon identification, based on a combination of subdetector likelihoods. The studies are carried out using the Belle II collision data of 2019 and early 2020. The analysed on-resonance dataset corresponds to an integrated luminosity of 34.6 fb−1, with an additional 3.2 fb−1 of off-resona… |
BELLE2-NOTE-PL-2020-027 | - | 2020-07-31 |
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Dark Sector Searches at Belle II Public
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 $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. D… |
BELLE2-CONF-PROC-2020-012 | - | 2020-07-31 |
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Diversity + Inclusion at Belle II: Where We Are, WhatWe’ve Done and Where We Want To BePublic
he Belle II Collaboration comprises over 1000 international high energy physicists, who investigate the properties of b-quarks and other particles at the luminosity frontier. In order to achieve our aim of a successful physics program, it is essential that we emphasise contributions from a diverse community. Belle II has thus far focused on divers… |
BELLE2-CONF-PROC-2020-018 | - | 2020-07-31 |
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Diversity and Inclusion Activities in the Belle II CollaborationPublic
Belle II is an international collaboration that has over 1000 members from institutions in 26 countries. In 2018 Belle II created two posts of diversity officers, to raise awareness of diversity and inclusion issues, promote an inclusive atmosphere within the collaboration, provide a safe and confidential point to contact for collaborators to repo… |
BELLE2-TALK-CONF-2020-035 | - | 2020-07-30 |
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Belle II RAW data management: The Online-Offline data transfer systemPublic
Data collection at the Belle II experiment started in the spring of 2019. During the early stages of the experiment it is important that the raw data are both copied to permanent storage and made available soon after being recorded to allow for the timely commissioning and calibration of the detector. Automated procedures have been developed to tr… |
BELLE2-TALK-CONF-2020-037 | - | 2020-07-30 |
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Dark Sector first results at 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 8×1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than its predecessor. During 2018, the machine has complet… |
BELLE2-TALK-CONF-2020-038 | - | 2020-07-28 |
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Charm potential at Belle IIPublic
The Charm sector provides a unique environment for the searches of Physics Beyond the Standard Model. Recent observation of CP violation in the D0 decays by the LHCb collaboration has renewed this interest and calls for confirmation in other channels and by other experiments. As we will discuss in this talk, Belle II will play a crucial role in me… |
BELLE2-TALK-CONF-2020-046 | - | 2020-07-28 |
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Results and Prospects of Radiative and Electroweak Penguin Decays at Belle IIPublic
In the recent years, several measurements of 𝐵-decays with flavor changing neutral currents, i.e. 𝑏→𝑠 transitions hint at deviations from the Standard Model (SM) predictions.These decays are forbidden at tree-level in the SM and can only proceed via suppressed loop level diagrams. Rare decays of 𝐵 mesons are an ideal probe to search for phenomena … |
BELLE2-TALK-CONF-2020-048 | - | 2020-07-28 |
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The Belle II Experiment: Status and ProspectsPublic
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 8×1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than its predecessor. With this data set, Belle II will be… |
BELLE2-TALK-CONF-2020-049 | - | 2020-07-28 |
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Status and Future development of the Full Event Interpretation Algorithm at Belle IIPublic
The Full Event Interpretation (FEI) is an exclusive tagging algorithm, that was developed for the Belle II experiment. By employing multivariate classifiers the FEI can identify and reconstruct semileptonic and hadronic B meson decay cascades with high efficiency. In this talk the status and performance of the FEI using recorded Belle II collision… |
BELLE2-TALK-CONF-2020-050 | - | 2020-07-28 |
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B lifetimes at Belle IIPublic
The Belle II detector was completed with the installation of a silicon vertex detector that covers most of the solid angle around the interaction region. In 2019 Physics Run before summer shutdown, 5.15 /fb of data were collected at a center of mass energy corresponding to the mass of the Y(4S). We utilize this dataset to characterize the performa… |
BELLE2-TALK-CONF-2020-051 | - | 2020-07-28 |
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Track reconstruction efficiency measurement using e+e- → τ+τ- events at Belle IIPublic
We present the measurement of the Belle II track reconstruction efficiency and Monte Carlo efficiency correction factors using τ-pair events, in which one τ lepton decays leptonically ( τ → lνν , l = e, μ) while the other decays hadronically into three charged pions ( τ → 3πν + nπ0). These measurements are performed using the e+e- collision data r… |
BELLE2-TALK-CONF-2020-052 | - | 2020-07-28 |
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Tau physics prospects at Belle II Public
The Belle II experiment is a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric e+e− collider. The design luminosity of the machine is 8 × 1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has complete… |
BELLE2-TALK-CONF-2020-045 | - | 2020-07-28 |
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Early charmless B decay physics at Belle II Public
The physics of charmless B decays is an essential portion of the Belle II program. The expected large yields of charmless B decays will enable significant advancements in the understanding of quark dynamics, including a world-leading determination of the CKM phase alpha/phi_2, a conclusive understanding of the so-called K-pi CP-puzzle, and a deepe… |
BELLE2-TALK-CONF-2020-044 | - | 2020-07-28 |
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Measurement of $\gamma$ ($\phi_3$) at Belle II Public
The CKM angle 𝛾 is the least well known of the angles of the unitarity triangle and the only one that is accessible with tree-level decays in a theoretically clean way. The key method to measure 𝛾 is through the interference between 𝐵+→𝐷0𝐾+ and 𝐵+→𝐷¯0𝐾+ decays which occurs if the final state of the charm-meson decay is accessible to both the 𝐷0 an… |
BELLE2-TALK-CONF-2020-043 | - | 2020-07-28 |
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Leptonic and semileptonic decays with taus at the Belle II experiment Public
The lepton flavour universality predicted by the Standard Model is challenged by various measurements of b-hadron decays involving tau and light leptons. The Belle II experiment started recording first collision data in Spring 2019 and offers a unique laboratory to study lepton flavour universality in leptonic and semileptonic decays of B mesons a… |
BELLE2-TALK-CONF-2020-042 | - | 2020-07-28 |
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