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The mass and width of the lightest scalar open-charm state listed in the Review of Particle Physics, the$$D_0^*(2300)$$D 0 ∗ ( 2300 ) , are in puzzling tension with predictions from unitarized chiral perturbation theory (UChPT) and lattice QCD, which favor a lighter state at around 2100 MeV. However, to date, no direct experimental evidence for this lighter state exists. In an effort to facilitate a direct observation, we introduce angular asymmetries of$$B\\rightarrow D \\pi \\ell \\nu $$B → D π ℓ ν decays that allow for a direct extraction of the$$D\\pi $$D π S-wave phase shift and discuss a novel measurement strategy for the Belle II experiment. We conduct a sensitivity study, finding that the Belle II experiment can determine the pole location with sufficient precision to firmly establish the$$D_0^*(2100)$$D 0 ∗ ( 2100 ) using the currently available data set. We also investigate the possibility and necessary statistics of measuring the$$D\\pi $$D π isospin 1/2 scattering length with an accuracy sufficient to distinguish between the predictions from both UChPT and lattice QCD and the measurement by ALICE using femtoscopy.

The mass and width of the lightest scalar open-charm state listed in the Review of Particle Physics, the D 0 ∗ ( 2300 ) , are in puzzling tension with predictions from unitarized chiral perturbation theory (UChPT) and lattice QCD, which favor a lighter state at around 2100 MeV. However, to date, no direct experimental evidence for this lighter state exists. In an effort to facilitate a direct observation, we introduce angular asymmetries of B → D π ℓ ν decays that allow for a direct extraction of the D π S-wave phase shift and discuss a novel measurement strategy for the Belle II experiment. We conduct a sensitivity study, finding that the Belle II experiment can determine the pole location with sufficient precision to firmly establish the D 0 ∗ ( 2100 ) using the currently available data set. We also investigate the possibility and necessary statistics of measuring the D π isospin 1/2 scattering length with an accuracy sufficient to distinguish between the predictions from both UChPT and lattice QCD and the measurement by ALICE using femtoscopy.

Background:Sports-related concussion (SRC) is an injury with important implications, especially in collision and contact sports, and has a high symptom burden. Student athletes face particular psychosocial challenges, especially female students with pre-existing anxiety/depression are at increased risk for SRC, and have a higher symptom burden before and after injury.Objectives:Describing female SRC presenting features at a collegiate campus-based sports medicine service; examining the association of prior concussion history (PCONC) and pre-existing anxiety/depression (PMHDx) with SRC.Methods:A retrospective cohort and statistical analysis (including corrected effect sizes) of Sport Concussion Assessment Tool (versions 3/5) data (Step 1: PCONC and PMHDx history; Step 2: symptom evaluation) of collegiate female athletes with SRC between 2012 and 2018.Results:Forty females with SRC were identified (age 23 ± 3). The five most frequent symptoms were headache (n = 34; 85%), feeling slowed down (n = 33; 83%), pressure in head (n = 33; 83%), don't feel right (n = 32; 80%) and fatigue/low-energy (n = 32; 80%). These five symptoms also had the highest self-rated severity (median (IQR): headache (3 (2-4)), feeling slowed down (3 (1-4)), fatigue/low-energy (3 (1-5)), don't feel right (3 (1-4)) and pressure in head (3 (2-4)). PMHDx (n = 8; 62.9 vs 38.6; p = 0.0192; Hedges' gs = 0.95; large ES), and not PCONC (n = 13; 51.0 vs 39.8; p = 0.2183; Hedges' gs = 0.48; small ES) was associated with increased mean total symptom severity.Conclusion:Headache, feeling slowed down, pressure in head, don't feel right and fatigue/low-energy had the highest symptom burden. Total symptom severity was no different in those with and without PCONC, but significantly higher in those with PMHDx.

The mass and width of the lightest scalar open-charm state listed in the Review of Particle Physics, the D₀^(*)(2300) D0∗(2300), are in puzzling tension with predictions from unitarized chiral perturbation theory (UChPT) and lattice QCD, which favor a lighter state at around 2100 MeV. However, to date, no direct experimental evidence for this lighter state exists. In an effort to facilitate a direct observation, we introduce angular asymmetries of B→ D π ℓ ν B→Dπℓν decays that allow for a direct extraction of the Dπ Dπ S-wave phase shift and discuss a novel measurement strategy for the Belle II experiment. We conduct a sensitivity study, finding that the Belle II experiment can determine the pole location with sufficient precision to firmly establish the D₀^(*)(2100) D0∗(2100) using the currently available data set. We also investigate the possibility and necessary statistics of measuring the Dπ Dπ isospin 1/2 scattering length with an accuracy sufficient to distinguish between the predictions from both UChPT and lattice QCD and the measurement by ALICE using femtoscopy.

A bstract 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 τ ± → ℓ ± γ ( ℓ = e, μ ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ ± → ℓ ± γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb − 1 , is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, B ( τ ± → μ ± γ ) ≤ 4 . 2 × 10 − 8 and B ( τ ± → e ± γ ) ≤ 5 . 6 × 10 − 8 , are set at 90% confidence level.

Abstract The mass and width of the lightest scalar open-charm state listed in the Review of Particle Physics, theD₀^(*)(2300)D 0 ∗ ( 2300 ) , are in puzzling tension with predictions from unitarized chiral perturbation theory (UChPT) and lattice QCD, which favor a lighter state at around 2100 MeV. However, to date, no direct experimental evidence for this lighter state exists. In an effort to facilitate a direct observation, we introduce angular asymmetries ofB→ D π ℓ ν B → D π ℓ ν decays that allow for a direct extraction of theDπ D π S-wave phase shift and discuss a novel measurement strategy for the Belle II experiment. We conduct a sensitivity study, finding that the Belle II experiment can determine the pole location with sufficient precision to firmly establish theD₀^(*)(2100)D 0 ∗ ( 2100 ) using the currently available data set. We also investigate the possibility and necessary statistics of measuring theDπ D π isospin 1/2 scattering length with an accuracy sufficient to distinguish between the predictions from both UChPT and lattice QCD and the measurement by ALICE using femtoscopy.

We present the study of a fuzzy clustering algorithm for the Belle II electromagnetic calorimeter using Graph Neural Networks. We use a realistic detector simulation including simulated beam backgrounds and focus on the reconstruction of both isolated and overlapping photons. We find significant improvements of the energy resolution compared to the currently used reconstruction algorithm for both isolated and overlapping photons of more than 30% for photons with energies E < 0.5 GeV and high levels of beam backgrounds. Overall, the GNN reconstruction improves the resolution and reduces the tails of the reconstructed energy distribution and therefore is a promising option for the upcoming high luminosity running of Belle II.

Using a data sample of 980 fb − 1 collected with the Belle detector at the KEKB asymmetric-energy e + e − collider, we study for the first time the singly Cabibbo-suppressed decays$$ {\\Omega}_c^0\\to {\\Xi}^{-}{\\pi}^{+} $$Ω c 0 → Ξ − π + and Ω − K + and the doubly Cabibbo-suppressed decay$$ {\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+} $$Ω c 0 → Ξ − K + . Evidence for an$$ {\\Omega}_c^0 $$Ω c 0 signal in the$$ {\\Omega}_c^0 $$Ω c 0 → Ξ − π + mode is reported with a significance of 4 . 5 σ including systematic uncertainties. The ratio of branching fractions to the normalization mode$$ {\\Omega}_c^0 $$Ω c 0 → Ω − π + is measured to be$$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right)=0.253\\pm 0.052\\left(\\textrm{stat}.\\right)\\pm 0.030\\left(\\textrm{syst}.\\right). $$B Ω c 0 → Ξ − π + / B Ω c 0 → Ω − π + = 0.253 ± 0.052 stat . ± 0.030 syst . . No significant signals of$$ {\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+} $$Ω c 0 → Ξ − K + and Ω − K + modes are found. The upper limits at 90% confidence level on ratios of branching fractions are determined to be$$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right)<0.070 $$B Ω c 0 → Ξ − K + / B Ω c 0 → Ω − π + < 0.070 and$$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{K}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right)<0.29. $$B Ω c 0 → Ω − K + / B Ω c 0 → Ω − π + < 0.29 .

Using a data sample of 980 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we study for the first time the singly Cabibbo-suppressed decays Ω0c → Ξ¯π+ and Ω¯K+ and the doubly Cabibbo-suppressed decay Ω0c → Ξ¯ K+. Evidence for an Ω0c signal in the Ω0c → Ξ¯π+ mode is reported with a significance of 4.5σ including systematic uncertainties.

We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay$$ {\\Lambda}_c^{+} $$Λ c + → pη ′ with η ′ → ηπ + π − , using a data sample corresponding to an integrated luminosity of 981 fb − 1 , collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. A significant$$ {\\Lambda}_c^{+} $$Λ c + → pη ′ signal is observed for the first time with a signal significance of 5.4 σ . The relative branching fraction with respect to the normalization mode$$ {\\Lambda}_c^{+} $$Λ c + → pK − π + is measured to be$$ \\frac{\\mathcal{B}\\left({\\Lambda}_c^{+}\\to p\\eta^{\\prime}\\right)}{\\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right)}=\\left(7.54\\pm 1.32\\pm 0.73\\right)\\times {10}^{-3}, $$B Λ c + → pη ′ B Λ c + → pK − π + = 7.54 ± 1.32 ± 0.73 × 10 − 3 , where the uncertainties are statistical and systematic, respectively. Using the world-average value of$$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right) $$B Λ c + → pK − π + = (6 . 28 ± 0 . 32) × 10 − 2 , we obtain$$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to p\\eta^{\\prime}\\right)=\\left(4.73\\pm 0.82\\pm 0.46\\pm 0.24\\right)\\times {10}^{-4}, $$B Λ c + → pη ′ = 4.73 ± 0.82 ± 0.46 ± 0.24 × 10 − 4 , where the uncertainties are statistical, systematic, and from$$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right) $$B Λ c + → pK − π + , respectively.