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First results on $V_{ub}$ and $V_{cb}$ with Belle II Public
Precision measurements of 𝑉𝑢𝑏 and 𝑉𝑐𝑏 play a central role in precision tests of the CKM sector of the Standard Model and complement direct measurements of CP violation of B meson decays. In this talk, we present first studies for measuring 𝑉𝑢𝑏 and 𝑉𝑐𝑏 with semileptonic decays using collision events recorded at the Υ(4𝑆) resonance by the Belle II e… |
BELLE2-TALK-CONF-2020-041 | - | 2020-07-28 |
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First results and prospects for tau LFV decay tau ->e + alpha(invisible) at Belle II Public
The Belle II experiment at SuperKEKB, an asymmetric e+e- collider, aims at a total integrated luminosity of 50 ab-1, to pursue a rich program of Standard Model and Beyond the Standard Model physics. In its first year of operation, approximately 10 fb-1 were collected at the Upsilon(4S) resonance, with about 100 fb-1 expected by the end of 2020. Th… |
BELLE2-TALK-CONF-2020-040 | - | 2020-07-28 |
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| CPV and CKM: Experimental OverviewPublic | BELLE2-TALK-CONF-2020-039 | - | 2020-07-28 |
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First results from Belle II on exotic and conventional quarkonium Public
The Belle II experiment at the SuperKEKB energy-asymmetric 𝑒+𝑒− collider is a substantial upgrade of the B factory facility at KEK in Tsukuba, Japan. The experiment began full operation in early 2019 and aims to record a factor of 50 times more data than its predecessor. Belle II is uniquely capable of studying the so-called "XYZ" particles: heavy… |
BELLE2-TALK-CONF-2020-047 | - | 2020-07-28 |
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First Physics Results from Belle II@SuperKEKBPublic
I will present a few highlights from the latest Belle II Physics Run, which took place in spring and summer 2020 during the global pandemic and just concluded a month ago. The peak luminosity was 2.4 x 10^34/cm^2/sec, which is a new world record. The focus will be on the first physics results from Belle II. The first Belle II publications are on t… |
BELLE2-TALK-CONF-2020-036 | - | 2020-07-28 |
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Trigger efficiency measurement using e+e- → τ+τ- events at Belle II Public
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 present the measurement of the L1 and high-level … |
BELLE2-TALK-CONF-2020-053 | - | 2020-07-28 |
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First flavor tagging calibration using 2019 Belle II dataPublic
We report on the first calibration of the standard Belle II B-flavor tagger using the full data set collected at the Upsilon(4S) resonance in 2019 with the Belle II detector at the SuperKEKB collider, corresponding to 8.7/fb of integrated luminosity. The calibration is performed by reconstructing various hadronic charmed B-meson decays with flavor… |
BELLE2-CONF-PH-2020-004 | - | 2020-07-28 |
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Approved plots for B -> tau nu study with 34.6 / fb of Phase III dataPublic
This note contains approved plots of B -> tau nu analysis with ICHEP 2020 dataset, corresponding to an integrated luminosity of 34.6 / fb. Details of the analysis are documented in the supporting physics note BELLE2-NOTE-PH-2020-024. |
BELLE2-NOTE-PL-2020-023 | - | 2020-07-28 |
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Kaon and Pion Identification Performances in Phase III dataPublic
We study the performances of the charged kaon and pion identification based on 37 fb−1PhaseIII data from the physics runs collected till early 2020 and compare with Phase III Monte Carlo(MC) events. The efficiency and the mis-ID rates of kaon and pion identification are calculated usingD∗+→D0[K−π+]π+decays for the binary PID criteria. The study… |
BELLE2-NOTE-PL-2020-024 | - | 2020-07-28 |
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Inclusive B → X_u e ν_e endpoint analysis: Approved plots for ICHEP2020Public
This note contains the approved plots associated with the note BELLE2-NOTE-PH-2019-013. This is an untagged analysis of B → Xueνe inclusive decay in Phase 3 data, with the initial aim of rediscovering the charmless B-meson decays using the Belle II detector. The used well-known inclusive technique examines the endpoint region of the inclusive char… |
BELLE2-NOTE-PL-2020-026 | - | 2020-07-28 |
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Rediscovery of the D0 ->KS0 KS0 decay with early Belle II dataPublic
The decay D0 ->KS0 KS0 is among the most interesting modes for the understanding of CP violation in charm decays. This note reports the "rediscovery" of this decay in the data sample collected by Belle II during 2019 and the first half of 2020, and corresponding to 37.8 fb−1 of integrated luminosity |
BELLE2-NOTE-PL-2020-020 | - | 2020-07-27 |
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Rediscovery of "wrong-sign" D0 decays to hadronic final states with early Belle II dataPublic
In the standard model, mixing and CP violation in the charm sector are expected to be very small and thus they constitute a sensitive probe for potential new physics contributions. The "wrong-sign" decays D0->K+π−, K+π−π0, K+π−π+π− are among the best channels to study charm mixing, as they can be produced through two interfering processes: a direc… |
BELLE2-NOTE-PL-2020-021 | - | 2020-07-27 |
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Rediscovery of $D^{0} \,\to\, K_{S}\pi^{0}$ with Belle II DetectorPublic
This note reports the plots for the rediscovery of decay mode $D^{*+} \,\to\, D^{0}\pi^{+}_{s}$, $D^{0} \,\to\, K_{S}\pi^{0}$ with Belle II data corresponding to an integrated luminosity of 34.6 fb$^{-1}$. Details of this study are reported in the internal document BELLE2-NOTE-PH-2020-037 |
BELLE2-NOTE-PL-2020-022 | - | 2020-07-27 |
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Belle II experiment sensitivity to the LFV decay tau -> e + alphaPublic
We study the charged lepton flavor violating decay tau -> e alpha, where alpha is a non-standard invisible boson that leaves the Belle II detector undetected. This Note presents plots showing the optimization procedure, relevant observables, and upper limit estimates using Belle II simulated data, assuming no tau -> e alpha signal in 25/fb of int… |
BELLE2-NOTE-PL-2020-018 | - | 2020-07-27 |
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Study of e+e−→J/ψ(→µ+µ−) via initial-state radiation at Belle IIPublic
We study e+e−→J/ψ(→µ+µ−) via initial-state radiation (ISR) using a data sample of an integrated luminosity of 37.8 fb^-1 collected with the Belle II detector at the Υ(4S) resonance and nearby. The distributions which represent ISR characteristics between data and MC are consistent. The J/ψ signal yield in data is compatible with our expectation ac… |
BELLE2-NOTE-PL-2020-017 | - | 2020-07-25 | |
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Measurement of the tracking efficiency and fake rate with e+e- -> tau+tau- eventsPublic
The tracking efficiency and fake rate have been measured using e+e− → τ+τ− events, where one tau lepton decays leptonically (τ → l±ν ν ̄ , l = e, μ) while the other decays hadronically into three charged pions (τ → 3π±ντ + nπ0). These measurements were performed using the e+e− collision data recorded during the 2019a, 2019b and 2019c data taking pe… |
BELLE2-NOTE-PL-2020-014 | - | 2020-07-24 |
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L1 trigger efficiencies for e+e− -> tau+tau- eventsPublic
The Level 1 trigger efficiency has been studied in τ-pair events. The ee → ττ → 1×3 prong and 1×1 prong decay signatures are considered. These measurements were performed using the e+e− collision data recorded during the 2019a, 2019b and 2019c data taking periods. This document contains the approved plots and captions. |
BELLE2-NOTE-PL-2020-015 | - | 2020-07-24 |
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Λc rediscovery in early Phase 3 Belle II dataPublic
This note describes $\Lambda_{c}^{+} \rightarrow p K^- \pi^+$ reconstruction in the data sample collected by Belle II during 2019 corresponding to 8.8 fb $^{-1}$ of integrated luminosity. |
BELLE2-NOTE-PL-2020-025 | - | 2020-07-24 |
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$D^0$ Lifetime Plots with 2019 DataPublic
Preliminary plots of the D0 lifetime for the D0 → K−π+, D0 → K−π+π0 and D0 → K−π+π+π− decays reconstructed in the data collected by Belle II during 2019, corresponding to 9.6 fb−1 of integrated luminosity. More details in B2NOTE-PH-2020-033. |
BELLE2-NOTE-PL-2020-008 | - | 2020-07-24 |
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Search for an invisible Z' in e+ e- -> mu+ mu- + missing energy final states in early phase 3 dataPublic
This note presents plots associated with the search for an invisible $Z^{\prime}$ in $e^+ e^- \rightarrow \mu^+ \mu^-$ + missing energy final states targeting early phase 3 data. Plots include a distribution of the remaining backgrounds expected from simulation after event selection and a MVA classification. Furthermore we show the expected 90\% C… |
BELLE2-NOTE-PL-2020-012 | - | 2020-07-23 |
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