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2025-06-12
15:27
[PUBDB-2025-01863] Lecture

Top quark physics
Lecture at University of Oxford (Oxford, Great Britain), 17 Jan 2025 - 28 Jan 20252025-01-172025-01-28  GO
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2025-06-12
12:25
OpenAccess [PUBDB-2025-01856] Journal Article
; ; ; et al
Measurement of the branching fraction, polarization, and time-dependent $CP$ asymmetry in $B^0 \to \rho^+\rho^-$ decays and constraint on the CKM angle $\phi_2$
[Belle II preprint 2024-024; KEK preprint 2024-23; arXiv:2412.19624]
We present a measurement of the branching fraction and fraction of longitudinal polarization of $B^0 \to \rho^+ \rho^-$ decays, which have two $\pi^0$'s in the final state. We also measure time-dependent $CP$ violation parameters for decays into longitudinally polarized $\rho^+ \rho^-$ pairs. [...]
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2025-06-12
12:22
OpenAccess [PUBDB-2025-01855] Journal Article
; ; ; et al
Measurement of the branching fraction and $\it CP$-violating asymmetry of the decay $B^{0} \rightarrow \pi^{0} \pi^{0}$ using $387$ million bottom-antibottom meson pairs in Belle II data
[Belle II Preprint 2024-032; KEK Preprint 2024-34; arXiv:2412.14260]
We measure the branching fraction and $\it CP$-violating flavor-dependent rate asymmetry of $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed using the Belle II detector in an electron-positron collision sample containing $387 \times 10^{6}$$B\overline{B}$ pairs. Using an optimized event selection, we find $126\pm 20$ signal decays in a fit to background-discriminating and flavor-sensitive distributions. [...]
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2025-06-12
12:18
OpenAccess [PUBDB-2025-01854] Journal Article
; ; ; et al
Measurement of branching fractions, CP asymmetry, and isospin asymmetry for $\boldsymbol{B\rightarrow\rho\gamma}$ decays using Belle and Belle II data
[Belle II Preprint 2023-019; KEK Preprint 2023-37; UCHEP-24-04; arXiv:2407.08984]
We present measurements of $B^{+}\rightarrow\rho^{+}\gamma$ and $B^{0}\rightarrow\rho^{0}\gamma$ decays using a combined data sample of $772 \times 10^6$$B\overline{B}$ pairs collected by the Belle experiment and $387\times 10^6$$B\overline{B}$ pairs collected by the Belle II experiment in $e^{+}e^{-}$ collisions at the $\Upsilon (4S)$ resonance. After an optimized selection, a simultaneous fit to the Belle and Belle II data sets yields $114\pm 12$$B^{+}\rightarrow\rho^{+}\gamma$ and $99\pm 12$$B^{0}\rightarrow\rho^{0}\gamma$ decays. [...]
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2025-06-12
12:12
OpenAccess [PUBDB-2025-01853] Preprint
; ; ; et al
Measurement of the CP asymmetry in $D^+ \to \pi^+ \pi^0$ decays at Belle II
[Belle II Preprint 2025-012; KEK Preprint 2025-10; arXiv:2506.07879]
We measure the CP asymmetry in $D^+ \to \pi^+ \pi^0$ decays reconstructed in $e^+ e^-$ collisions at the Belle II experiment using a data set corresponding to an integrated luminosity of 428 fb$^{-1}$. A control sample of $D^+ \to \pi^+ K_{S}$ decays is used to correct for detection and production asymmetries. [...]
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2025-06-12
12:08
OpenAccess [PUBDB-2025-01852] Preprint
; ; ; et al
Search for a dark Higgs boson produced in association with inelastic dark matter at the Belle II experiment
[Belle II Preprint 2025-015; KEK Preprint 2025-14; arXiv:2505.09705]
Inelastic dark matter models that have two dark matter particles and a massive dark photon can reproduce the observed relic dark matter density without violating cosmological limits. The mass splitting between the two dark matter particles $\chi_{1}$ and $\chi_{2}$, with $m(\chi_{2}) > m(\chi_{1})$, is induced by a dark Higgs field and a corresponding dark Higgs boson $h^{\prime}$. [...]
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2025-06-12
12:03
OpenAccess [PUBDB-2025-01851] Internal Report

DESY-III: Design Report
[DESY-HERA-86-11]
60 pp. () [10.3204/PUBDB-2025-01851]  GO
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2025-06-12
11:25
OpenAccess [PUBDB-2025-01849] Preprint
; ; ; et al
Search for lepton flavor-violating decay modes $B^0 \to K^{\ast 0}\tau^\pm\ell^\mp$ ($\ell = e,\mu$) with hadronic B-tagging at Belle and Belle II
[Belle II preprint: 2025-014; KEK preprint: 2025-13; arXiv:2505.08418]
We present the results of a search for the charged-lepton-flavor violating decays $B^0 \rightarrow K^{*0}\tau^\pm \ell^{\mp}$, where $\ell^{\mp}$ is either an electron or a muon. The results are based on 365 fb$^{-1}$ and 711 fb$^{-1}$ datasets collected with the Belle II and Belle detectors, respectively. [...]
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2025-06-12
11:22
OpenAccess [PUBDB-2025-01848] Preprint
; ; ; et al
Measurement of the time-integrated $CP$ asymmetry in $D^0\to\pi^0\pi^0$ decays at Belle II
[Belle II Preprint 2025-009; KEK Preprint 2025-7; arXiv:2505.02912]
We measure the time-integrated $CP$ asymmetry, $A_{CP}$, in $D^0\to\pi^0\pi^0$ decays reconstructed in $e^+e^-\to c\bar{c}$ events collected by Belle II during 2019--2022. The data corresponds to an integrated luminosity of 428$\mathrm{fb}^{-1}$. [...]
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2025-06-12
11:18
OpenAccess [PUBDB-2025-01847] Preprint
; ; ; et al
Search for lepton-flavor-violating $\tau^- \to \ell^- K_s^0$ decays at Belle and Belle II
[arXiv:2504.15745]
We present the results of a search for charged-lepton-flavor violating decays $\tau^{-} \rightarrow \ell^{-}K_{S}^{0}$, where $\ell^{-}$ is either an electron or a muon. We combine $e^+e^-$ data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb$^{-1}$) with samples recorded by the Belle experiment at the KEKB collider (980 fb$^{-1}$) to obtain a sample of 1.3 billion $e^+e^-\to\tau^+\tau^-$ events. [...]
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