2025-10-09 14:28 |
[PUBDB-2025-04280]
Preprint
Abumusabh, M. ; Adachi, I. ; Aggarwal, L. ; et al
Measurement of time-dependent $CP$ asymmetries in $B^0 \to K_{\rm S}^0 \: π^{+} π^{-} γ$ decays at Belle and Belle II
[Belle II preprint: 2025-001; KEK preprint: 2024-49; arXiv:2510.01331]
We present a measurement of the time-dependent $CP$ asymmetry in $B^0 \to K_{\rm S}^0 \: π^{+} π^{-} γ$ decays using a data set of 365 fb$^{-1}$ recorded by the Belle II experiment and the final data set of 711 fb$^{-1}$ recorded by the Belle experiment at the ${\rm Υ(4S)}$ resonance. The direct and mixing-induced time-dependent $CP$ violation parameters $C$ and $S$ are determined along with two additional quantities, $S^{+}$ and $S^{-}$, defined in the two halves of the $m^2(K_{\rm S}^0 π^{+})-m^2(K_{\rm S}^0 π^{-})$ plane. [...]
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2025-10-09 14:25 |
[PUBDB-2025-04279]
Preprint
Abumusabh, M. ; Adachi, I. ; Ahmed, H. ; et al
Search for $CP$ violation in $Ξ_c^+\toΣ^+h^+h^-$ and $Λ_c^+\to ph^+h^-$ at Belle II
[Belle II Preprint 2025-024; KEK Preprint 2025-26; arXiv:2509.25765]
We report decay-rate $CP$ asymmetries of the singly-Cabibbo-suppressed decays $Ξ_c^+\toΣ^+h^+h^-$ and $Λ_c^+\to ph^+h^-$, with $h=K,π$, measured using 428 fb$^{-1}$ of $e^+e^-$ collisions collected by the Belle II experiment at the SuperKEKB collider. The results, \begin{equation} A_{CP}(Ξ_c^+\toΣ^+K^+K^-) = (3.7\pm6.6\pm0.6)\%, \end{equation}\begin{equation} A_{CP}(Ξ_c^+\toΣ^+π^+π^-) = (9.5\pm6.8\pm0.5)\%, \end{equation}\begin{equation} A_{CP}(Λ_c^+\to pK^+K^-) = (3.9\pm1.7\pm0.7)\%, \end{equation}\begin{equation} A_{CP}(Λ_c^+\to pπ^+π^-) = (0.3\pm1.0\pm0.2)\%, \end{equation} where the first uncertainties are statistical and the second systematic, agree with $CP$ symmetry. [...]
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2025-10-09 14:22 |
[PUBDB-2025-04278]
Preprint
Abumusabh, M. ; Adachi, I. ; Aggarwal, L. ; et al
Search for $e^+ e^- \to \gamma X_{bJ}$ ($J$ = 0, 1, 2) near $\sqrt{s}$ = 10.746 GeV at Belle II
[Belle II Preprint 2025-022; KEK Preprint 2025-21; arXiv:2508.16036]
We search for the $e^+ e^- \to γχ_{bJ}$ ($J$ = 0, 1, 2) processes at center-of-mass energies $\sqrt{s}$ = 10.653, 10.701, 10.746, and 10.804 GeV. These data were collected with the Belle II detector at the SuperKEKB collider and correspond to 3.5, 1.6, 9.8, and 4.7 fb$^{-1}$ of integrated luminosity, respectively. [...]
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2025-09-29 10:13 |
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2025-09-25 16:53 |
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2025-09-24 10:19 |
[PUBDB-2025-04077]
Preprint
Reuter, J.
Monte Carlo Event Generators
[DESY-25-130; arXiv:2509.21611]
Monte Carlo event generators are in a modern terminology the digital twins of collider-based particle physics experiment. We give an introduction into the application of MC generators for particle physics, discuss their different components each simmulating a different aspect of physics. [...]
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2025-09-19 13:25 |
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2025-09-19 13:23 |
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2025-09-19 13:21 |
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2025-09-19 13:18 |
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