J. Gemmler

Punzi-loss:

F. Abudinén, M. Bertemes, S. Bilokin, M. Campajola et autres

Abstract We present the novel implementation of a non-differentiable metric approximation and a corresponding loss-scheduling aimed at the search for new particles of unknown mass in high energy physics experiments. We call the loss-scheduling, based on the minimisation of a figure-of-merit related …

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Punzi-loss: – a non-differentiable metric approximation for sensitivity optimisation in the search for new particles

F. Abudinén, M. Bertemes, S. Bilokin, M. Campajola et autres

$B$-flavor tagging at Belle II

Н. Акопов, A. Aloisio, V. Babu, Sw. Banerjee et autres

Abstract We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( "Image missing") mesons at Belle II. The algorithms provide essential inputs for measurements of quark-flavor mixing and charge-parity violation. We validate and evaluate the performance …

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Study of $χ_{bJ}(nP) \rightarrow ωΥ(1S)$ at Belle

A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara et autres

We report results from a study of hadronic transitions of the $χ_{bJ}(nP)$ states of bottomonium at Belle. The $P$-wave states are reconstructed in transitions to the $Υ(1S)$ with the emission of an $ω$ meson. The transitions of the $n=2$ triplet states provide …

Measurement of the time-integrated mixing probability $χ_d$ with a semileptonic double-tagging strategy and $34.6 {\rm fb}^{-1}$ of Belle II collision data

Belle II Collaboration, F. Abudinén, I. Adachi, R. Adak et autres

We present the first measurement of the time-integrated mixing probability $χ_d$ using Belle II data collected at a center-of-mass (CM) energy of 10.58 GeV, corresponding to the mass of the $Υ$(4S) resonance, with an integrated luminosity of $34.6 {\rm fb}^{-1}$ at the …

Search for lepton-flavor-violating tau-lepton decays to $\ell\gamma$ at Belle

K. Adamczyk, J. K. Ahn, K. Arinstein, Yuji Arita et autres

Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays $\tau^{\pm}\rightarrow\ell^{\pm}\gamma$ ($\ell=e,\mu$) are predicted to have a sizeable probability, making them particularly interesting channels to search at …

Measurement of the branching fractions of $B\to\eta' K$ decays using 2019/2020 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi, R. Adak et autres

This note describes the rediscovery of $B\to\eta' K$ decays in Belle II data, both in the charged and neutral final state: $B_0\to\eta' K_S$ and $B^\pm\to\eta' K^\pm$. The $\eta'$ is searched for in two decay modes: $\eta'\to\eta\pi^+\pi^-$ with $\eta\to\gamma\gamma$, and $\eta'\to\rho\gamma$. The analysis …

Study of $B\to D^{(*)}h$ decays using $62.8~\mathrm{fb}^{-1}$ of Belle II data

F. Abudinén, I. Adachi, R. Adak, K. Adamczyk et autres

We report measurements related to hadronic $B$ decays to final states that contain charm mesons. The analyses are performed on a $62.8~\mathrm{fb}^{-1}$ data set collected by the Belle II experiment at a center-of-mass energy corresponding to the mass of the $Υ(4S)$ resonance. …

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A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \rightarrow X\ell ν$ decays

Belle II Collaboration, F. Abudinén, I. Adachi, R. Adak et autres

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 …

Measurement of two-particle correlations in hadronic $e^{+}e^{-}$ collisions at Belle

Belle Collaboration, A. Abdesselam, I. Adachi, K. Adamczyk et autres

The enhancement of charged-particle pairs with large pseudorapidity difference and small azimuthal angle difference, often referred to as the ``ridge signal'', is a phenomenon widely observed in high multiplicity proton-proton, proton-ion and deutron-ion collisions, which is not yet fully understood. In heavy-ion …

Rediscovery of $B \to ϕK^{(*)}$ decays and measurement of the longitudinal polarization fraction $f_L$ in $B \to ϕK^{*}$ decays using the Summer 2020 Belle II dataset

F. Abudinén, I. Adachi, R. Adak, K. Adamczyk et autres

We utilize a sample of 34.6 fb$^{-1}$, collected by the Belle II experiment at the SuperKEKB asymmetric energy $e^+e^-$ collider, to search for the $B^+ \to ϕK^+$, $B^+ \to ϕK^{*+}$, $B^0 \to ϕK^0_S$, and $B^0 \to ϕK^{*0}$ decays. Charmless hadronic $B$ decays …

Global decay chain vertex fitting at Belle II

J. F. Krohn, F. Tenchini, P. Urquijo, F. Abudinén et autres

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