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Measurement of decay-time dependent CP violation in B0 → KS0KS0KS0 using 2019--2021 Belle II dataPublic
We report a measurement of decay-time dependent CP-violating parameters in B0 → KS0KS0KS0 decays. We use $(198.0 \pm 3.0) \times 10^6\ \BB$ pairs collected at the \FourS resonance with the Belle II detector at the SuperKEKB asymmetric-energy $e^+e^-$ collider. The observed mixing-induced and direct \cp violation parameters are $\scp = -1.86\ _{-0.… |
BELLE2-CONF-PH-2022-007 |
Koji Hara,
Kazutaka Sumisawa,
Yutaka Ushiroda
Hikaru Tanigawa |
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Reconstruction of B→ρℓνℓ decays identified using hadronic decays of the recoil B meson in 2019 -- 2021 Belle II dataPublic
We present results on the semileptonic decays $B^0 \to \rho^- \ell^+ \nu_\ell$ and $B^+ \to \rho^0 \ell^+ \nu_\ell$ in a sample corresponding to 189.9/fb of Belle II data at the SuperKEKB $e^- e^+$ collider. Signal decays are identified using full reconstruction of the recoil $B$ meson in hadronic final states. We determine the total branching fra… |
BELLE2-CONF-PH-2022-029 | Kevin Varvell, Pablo Goldenzweig, Moritz Bauer, Nadia Toutounji |
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Determination of $|V_{cb}|$ from $B\to D\ell\nu$ decays using 2019--2021 Belle II data Public
We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{cb}$ using the decay $B\to D\ell\nu$ based on $e^+e^-\to\Upsilon(4S)$~data recorded by the Belle II detector and corresponding to \lumi of integrated luminosity. The semileptonic decays \ensuremath{\Bz \to D^{-}(\to K^+ \pi^- \pi^-) \ell^{+} \nu_\… |
BELLE2-CONF-PH-2022-010 | Philipp Horak, Christoph Schwanda |
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Determination of $|V_{ub}|$ from untagged $B^0\to\pi^- \ell^+ \nu_{\ell}$ decays using 2019-2021 Belle~II dataPublic
We present an analysis of the charmless semileptonic decay $B^0\to\pi^- \ell^+ \nu_{\ell}$, where $\ell = e, \mu$, from 198.0 million pairs of $B\bar{B}$ mesons recorded by the Belle~II detector at the SuperKEKB electron-positron collider. The decay is reconstructed without identifying the partner $B$ meson. The partial branching fractions are mea… |
BELLE2-CONF-PH-2022-017 | Peter Lewis, Svenja Granderath, Jochen Dingfelder, Florian Bernlochner |
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Study of Exclusive $B \to \pi e^+ \nu_e$ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb$^{-1}$ of Belle II DataPublic
We present a reconstruction of the semileptonic decays $B^0 \to \pi^- e^+ \nu_e$ and $B^+ \to \pi^0 e^+ \nu_e$ in a sample corresponding to 189.3 fb$^{-1}$ of Belle II data, using events where the partner $B$-meson is reconstructed from a large variety of hadronic channels via a tagging algorithm known as the full-event-interpretation. We determin… |
BELLE2-CONF-PH-2022-008a | Kevin Varvell, Pablo Goldenzweig, Moritz Bauer, Nadia Toutounji |
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Measurement of the branching fraction for the decay $B \to K^{\ast}(892)\ell^+\ell^-$ at Belle IIPublic
We report a measurement of the branching fraction of $B \to K^{\ast}(892)\ell^+\ell^-$ decays, where $\ell^+\ell^- = \mu^+\mu^-$ or $e^+e^-$, using electron-positron collisions recorded at an energy at or near the $\Upsilon(4S)$ mass and corresponding to an integrated luminosity of $189$ fb$^{-1}$. The data was collected during 2019--2021 by the B… |
BELLE2-CONF-PH-2022-009 | Seema Choudhury |
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Measurements of the branching fraction and direct $\CP$-violating asymmetry in $\Bz \to \Kz \piz$ decaysPublic
We report the measurements of branching fraction ($\mathcal{B}$) and direct $\CP$-violating asymmetry ($\ACP$) in the charmless decays $\Bz\to K^0\pi^0$ at Belle~II. A sample of $\ep\en$ collisions, corresponding to $189.8\invfb$ of integrated luminosity, recorded near the $\Upsilon(4S)$ resonance is used for the study. We find $135$ signal candid… |
BELLE2-CONF-PH-2022-002 |
Gagan Mohanty,
Sagar Hazra
A. B. Basith |
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Measurements of the branching fraction and direct $\CP$-violating asymmetry in $\Bz \to \Kz \piz$ decaysPublic
We report the measurements of branching fraction ($\mathcal{B}$) and direct $\CP$-violating asymmetry ($\ACP$) in the charmless decays $\Bz\to K^0\pi^0$ at Belle~II. A sample of $\ep\en$ collisions, corresponding to $189.8\invfb$ of integrated luminosity, collected near the $\Upsilon(4S)$ resonance is used for the study. We find $135$ signal can… |
BELLE2-CONF-PH-2022-001 | Gagan Mohanty, Sagar Hazra, Abdul Kaliyar |
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Measurement of the inclusive semileptonic B meson branching fraction in 62.8/fb of Belle II dataPublic
We report a measurement of the branching fraction of inclusive semileptonic B meson decays B -> Xc l nu in Υ(4S) -> BBbar data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy e+e- collider and corresponding to 62.8/fb of integrated luminosity. Only a charged lepton (electon or muon) is reconstructed and the signal yield is d… |
BELLE2-CONF-PH-2021-012 | Manca Mrvar, Christoph Schwanda |
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Measurements of the branching fraction, isospin asymmetry, and lepton-universality ratio in {\boldmath $B \to J/\psi K$} decays at Belle IIPublic
We report a study of $B \to J/\psi(\ell^{+}\ell^{-}) K$ decays, where $\ell$ represents an electron or a muon, using $e^{+}e^{-}$ collisions at the $\Upsilon(4S)$ resonance. The data were collected by the Belle~II experiment at the SuperKEKB asymmetric-energy collider during 2019--2021, corresponding to an integrated luminosity of $189$\,fb$^{-1}$… |
BELLE2-CONF-PH-2022-006 |
Gagan Mohanty,
Rahul Tiwary,
Saurabh Sandilya
S. Halder |
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Angular analysis of $B^+ \to \rho^+\rho^0$ decays reconstructed in 2019, 2020, and 2021 Belle~II dataPublic
We report on a Belle II measurement of the branching fraction~($\mathcal{B}$), longitudinal polarization fraction ~($f_L$), and \CP~asymmetry~$\mathcal{A}_{\CP}$ of $B^+\to \rho^+\rho^0$ decays. We reconstruct $B^+\to \rho^+(\to \pi^+\pi^0(\to \gamma\gamma))\rho^0(\to \pi^+\pi^-)$ decays in a sample of SuperKEKB electron-positron collisions colle… |
BELLE2-CONF-PH-2022-005 | Eldar Ganiev, Mirco Dorigo, Sebastiano Raiz, Riccardo Manfredi, Diego Tonelli |
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Muon and electron identification efficiencies and hadron-lepton mis-identification rates at Belle II for Moriond 2022Public
We present a collection of selected results on the performance of Belle II in the identification of electrons and muons. This work is carried out using data collected at the Belle II experiment from 2019 to mid-2021. The dataset corresponds to a total integrated luminosity of $\int L~\mathrm{dt} = 190 \invfb$ collected at the centre-of-mass energy… |
BELLE2-CONF-PH-2022-003 | Charged PID Group, The Belle II Collaboration |
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Measurements of the branching fractions for B→K∗γ decays at Belle IIPublic
This paper reports a study of B→K∗γ decays using 62.8±0.6 fb−1 of data collected during 2019–2020 by the Belle II experiment at the SuperKEKB e+e− asymmetric-energy collider, corresponding to (68.2±0.8)×10^6 BB events. We find 454±28, 50±10, 169±18, and 160±17 signal events in the decay modes B0→K∗0[K+π−]γ, B0→K∗0[K0Sπ0]γ, B+→K∗+[K+π… |
BELLE2-CONF-PH-2021-014 |
Gagan Mohanty,
Rishabh Mehta,
Rahul Tiwary,
Saurabh Sandilya
R. Dhamija |
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Measurement of the $B^-\to D^0 \ell^- \bar\nu_\ell$ Branching Fraction in 62.8~fb$^{-1}$ of Belle II dataPublic
We report a measurement of the branching fraction of the semileptonic decay \bdlnu (and its charge conjugate) using \mbox{$62.8~\text{fb}^{-1}$} of $\Upsilon(4S)\to B\bar B$~data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy $e^+ e^-$ collider. The neutral charm meson is searched for in the decay mode $D^0\to K^-\pi^+$ and… |
BELLE2-CONF-PH-2021-011 | Philipp Horak, Christoph Schwanda |
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Exclusive $B \to X_u \ell \nu_\ell$ Decays with Hadronic Full-event-interpretation Tagging in 62.8\invfb of Belle II DataPublic
We present a reconstruction in early data of the semileptonic decay $B^+ \to \pi^0 \ell^+ \nu_\ell$, and first results of a reconstruction of the decays $B^+ \to \rho^0 \ell^+ \nu_\ell$ and $B^0 \to \rho^- \ell^+ \nu_\ell$ in a sample corresponding to 62.8\invfb of Belle II data using hadronic $B$-tagging via the full-event-interpretation algorith… |
BELLE2-CONF-PH-2021-013 | Kevin Varvell, Pablo Goldenzweig, Moritz Bauer, Nadia Toutounji |
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Measurement of the branching fraction for $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed in 2019–2020 Belle II dataPublic
We report the first reconstruction of the $B^{0} \to \pi^{0} \pi^{0}$ decay mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8 \invfb of integrated luminosity. We find $14.0^{+6.8}_{-5.6}$ signal decays, corresponding to a significance of 3.4 standard deviations and determine a branching ratio of $\mathcal{B}(\Bpipi) = [0… |
BELLE2-CONF-PH-2021-003 | Francis Pham, Martin Sevior |
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Rediscovery of $\Bz\to\jpsi\KL$ at Belle IIPublic
We present preliminary results on the reconstruction of the \bjpsikl decay, where $\jpsi\to\mumu$ or \epem. Using a dataset corresponding to a luminosity of $62.8\pm0.6\invfb$ collected by the Belle II experiment at the SuperKEKB asymmetric energy \epem collider, we measure a total of $267\pm21$ candidates with $\jpsi\to\mumu$ and $226\pm20$ with … |
BELLE2-CONF-PH-2021-009 | Belle II Collaboration |
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Measurement of the branching fractions of B → η'K decays using 2019/2020 Belle II dataPublic
This note describes the rediscovery of B → η' K decays in Belle II data, both in the charged and neutral final state: B0 → η' KS and B± → η' K± . The η' is searched for in two decay modes: η' → ηπ+ π− with η → γγ, and η' → ργ. The analysis uses data collected in 2019 and 2020 at the SuperKEKB asymmetric e+ e− collider, with an integrated luminosit… |
BELLE2-CONF-PH-2021-007 | Belle II Collaboration |
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Measurement of the time-integrated mixing probability chi_d with a semileptonic double-tagging strategy and 34.6 fb^-1 of Belle II collision dataPublic
We present a first measurement of the time-integrated mixing probability chi_d using Belle II collision data corresponding to the integrated luminosity of 34.6 fb^-1. We reconstruct pairs of B mesons both decaying in semileptonic final states. Using a novel extraction methodology, we measure 0.192 +- 0.010 (stat.) +- 0.016 (syst.), which is compat… |
BELLE2-CONF-PH-2021-004 | Peter Lewis, Stephan Duell, Jochen Dingfelder, Florian Bernlochner |
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Study of B→D(∗)h decays using 62.8 fb−1 of Belle II dataPublic
We report measurements related to hadronic $B$ decays to final states that contain charm mesons. The analyses are performed on an $62.8~\mathrm{fb}^{-1}$ data set collected by the Belle II experiment at a center-of-mass energy corresponding to the mass of the $\Upsilon(4S)$ resonance. The measurements reported are for the decay modes $B^-\to D^0 h… |
BELLE2-CONF-PH-2021-008 |
Chiara La Licata,
Minakshi Nayak,
James Libby,
Karim Trabelsi,
Eiasha Waheed,
Niharika Rout
Y.Zhang |
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