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Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019--2020 Belle~II dataPublic
We report on first measurements of branching fractions~($\mathcal{B}$) and CP-violating charge asymmetries~($\mathcal{A}_{\rm CP}$) in charmless $B$ decays at Belle~II. We use a sample of electron-positron collisions collected in 2019 and 2020 at the $\Upsilon(4S)$ resonance and corresponding to $34.6$\,fb$^{-1}$ of integrated luminosity. We us… |
BELLE2-CONF-PH-2020-012 |
Fernando Abudinen,
Markus Reif,
Hans-Günther Moser,
Sebastiano Raiz,
Diego Tonelli,
Benedikt Wach,
Eldar Ganiev,
Paoti Chang,
Riccardo Manfredi
Y.-C. Chen, C.-H. Li |
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Measurement of Hadronic Mass Moments in B->Xclv Decays at Belle IIPublic
We present measurements of the first six hadronic mass moments in semileptonic $B \rightarrow X_c \ell \nu $ decays. The hadronic mass moments, together with other observables of inclusive $B$ decays, can be used to determine the CKM matrix element $\abs{V_{cb}}$ and mass of the $b$-quark $m_b$ in the context of Heavy Quark Expansions of QCD.… |
BELLE2-CONF-PH-2020-011 | Florian Bernlochner, Maximilian Welsch |
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Measurement of the semileptonic $\bar{B^0} \rightarrow D^{*} \ell \nu_{\ell}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb$^{-1}$ of Belle~II dataPublic
We present a first measurement of the $\bar{B^0} \rightarrow D^{*} \ell \nu_{\ell}$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Interpretation algorithm. Collision events corresponding to an integrated luminosity of \lumi are analyzed, which were recorded by the Belle~II detector operated at the SuperKE… |
BELLE2-CONF-PH-2020-009 |
William Sutcliffe,
Kyle Amirie,
Florian Bernlochner,
Michael Eliachevitch
Racha Cheaib, Hannah Wakeling |
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Studies of the semileptonic $\bar B^0\to D^{*+}\ell^-\bar\nu_\ell$ and $B^-\to D^{0}\ell^-\bar\nu_\ell$ decay processes with \mbox{34.6 fb$^{-1}$} of Belle II dataPublic
We report measurements of the $\bar B^0\to D^{*+}\ell^-\bar\nu_\ell$ and $B^-\to D^{0}\ell^-\bar\nu_\ell$ processes using \mbox{34.6 fb$^{-1}$} of collision events recorded by the Belle~II experiment at the SuperKEKB asymmetric-energy $e^+ e^-$ collider. For the $B^-\to D^{0}\ell^-\bar\nu_\ell$ channel, we present first studies that isolate this d… |
BELLE2-CONF-PH-2020-008 |
Lu Cao,
Abner Soffer,
Philipp Horak,
Christoph Schwanda,
Chaoyi Lyu,
Minakshi Nayak,
Florian Bernlochner
Daniel Dorner |
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A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \rightarrow X\ell \nu$ decaysPublic
Tag-side reconstruction is an important method for reconstructing $B$ meson decays with missing energy. The Belle II tag-side reconstruction algorithm, Full Event Interpretation, relies on a hierarchical reconstruction of $B$ meson decays with multivariate classification employed at each stage of reconstruction. Given the large numbers of classifi… |
BELLE2-CONF-PH-2020-005 | William Sutcliffe, Florian Bernlochner |
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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 | Kevin Varvell, Pablo Goldenzweig, Moritz Bauer, Nadia Toutounji |
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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 | The Belle II Collaboration |
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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 | The Belle II Collaboration |
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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 | Fernando Abudinen, Takeo Higuchi, Colm Murphy |
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Measurement of the $B^{0}$ lifetime using fully reconstructed hadronic decays in the 2019 Belle II dataset Public
This document presents the measurement of B 0 meson lifetimes using the 2019 Belle II dataset that corresponds to an integrated luminosity of $8.7 \pm 0.2 fb^{-1}$. Each candidate is fully reconstructed with hadronic decay final states on the signal side, while the rest-of-event technique allows to infer the decay vertex position on the other (tag… |
BELLE2-CONF-PH-2020-003 | Sviatoslav Bilokin, Jerome Baudot, Reem Rasheed, Giulio Dujany |
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Measurement of the branching fraction of $B^{0}\to D^{*-}l^{+}\nu_{l}$ with early Belle II dataPublic
We measure the branching fractions for the decays $B^{0}\to D^{*-}e^{+}\nu_{e}$ and $B^{*0}\to D^{*-}\mu^{+}\nu_{\mu}$ using the first $8.70 \pm 0.09 fb^{-}$ of data collected by the Belle II experiment at the SuperKEKB asymmetric-energy $e^+ e^-$ collider using the decays $D^{*+}\to D^0 \pi^+$ and $D^0\to K^-\pi^+$. |
BELLE2-CONF-PH-2020-002 | Minakshi Nayak, Abner Soffer, Lu Cao, Florian Bernlochner, Chaoyi Lyu |
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Measurements of electroweak penguin and lepton-flavour violating $B$ decays to final states with missing energy at Belle and Belle IIPublic
Electroweak penguin and lepton-flavour violating $B$ decays are key focuses of the Belle II physics program. These processes are particularly challenging due to the presence of neutrinos in the final states, resulting in `missing energy' in the rare $b\to s$ transitions. Using electron-positron collision data collected at the $\Upsilon(4S)$ resona… |
BELLE2-CONF-PROC-2024-020 | Meihong Liu |
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Measurements of hadronic B decay rates at Belle and Belle IIPublic
The Belle and Belle~II experiments have collected a 1.1~ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at the $\Upsilon(4S)$. The study of hadronic $B$ decays in these data allow the precise measurement of absolute branching fractions and angular distributions of the decay products. These measurements provide tests of QCD and enable the gene… |
BELLE2-CONF-PROC-2024-019 | Vismaya V S |
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Rare B decays at e+e− collidersPublic
The rare decays of B mesons offer a prime opportunity to test predictions of the Standard Model and to search for effects beyond the Standard Model. The coherent production of B mesons at e+e− colliders provides a clean experimental setup for these studies. In this paper, we discuss the recent results of rare B decays from the Belle and Belle II e… |
BELLE2-CONF-PROC-2024-018 | Rahul Tiwary |
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Bottomonium and exotic spectroscopyPublic
This proceedings summarize the most recent measurements of exotic bottomonium states to probe the fundamentals of QCD at the Belle, Belle II and LHCb experiments. |
BELLE2-CONF-PROC-2024-017 | Renu Garg |
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Searches for Dark Sector Particles at Belle and Belle IIPublic
The Belle and Belle II experiment have collected samples of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These data have constrained kinematics and low multiplicity, which allow searches for dark sector particles in the mass range from a few MeV to 10 GeV. The latest dark sector results by Belle and Bell… |
BELLE2-CONF-PROC-2024-016 | Savino Longo |
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Measurements of lepton-flavour universality in semileptonic B decays at Belle and Belle IIPublic
The Belle and Belle II experiments have collected a $1.1$\,ab$^{-1}$ sample of $e^{+}e^{-} \rightarrow B\bar B$ collisions at the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity, constrained initial state kinematics and excellent lepton identification, are an ideal environment to study lepton-flavour universality in semilepton… |
BELLE2-CONF-PROC-2024-015 | Michele Mantovano |
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Charmless B decay reconstruction in 2019 dataPublic
We report on the reconstruction of various charmless $B$ decays from electron-positron collisions at the energy corresponding to the $\Upsilon(4S)$ resonance collected with the Belle II detector at the SuperKEKB collider. We use simulation to devise optimized event selections and apply them to the full data set collected in 2019, corresponding to… |
BELLE2-CONF-PH-2020-001 | Eldar Ganiev, Fernando Abudinen, Sebastiano Raiz, Riccardo Manfredi, Diego Tonelli |
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Searches for dark sector particles at Belle and Belle IIPublic
Belle and Belle II experiments gathered around 1.5 ab$^{-1}$ of dataset near $\Upsilon(nS)$ resonances, which have constrained kinematics and low multiplicity suitable for dark sector searches. Both experiments have excellent sensitivity for dark sector searches in the few MeV - 10 GeV range. The latest dark sector searches performed by both colla… |
BELLE2-CONF-PROC-2024-028 | Rajesh Kumar Maiti |
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Search for radiative $D_s$ decaysPublic
The study of weak radiative decays of charmed mesons is still in its developing stage. The weak decays of $D$ mesons pose challenges due to significant final-state interactions. However, decays mediated by $c \rightarrow u \gamma$ transitions can be affected by potential contributions coming from the non-minimal supersymmetry, which is an new phys… |
BELLE2-CONF-PROC-2024-027 | N Sushree Ipsita |
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