In process

Effective particle identification capabilities are a strategic priority for the physics program of the Belle~II experiment. We describe the algorithms used at Belle~II for identifying electrons and muons and separating them from charged hadrons. [...]

We search for the pionic transitions $X(3872)\toπ^0χ_{cJ}(1P)$$(J = 0,~1,~2)$ and $X(3915)\toπ^0χ_{c1}$ in $B^+\to π^0χ_{cJ}K^+$ decays using the Belle and Belle~II data samples collected at the $Υ(4S)$ resonance, corresponding to integrated luminosities of $711~\mathrm{fb}^{-1}$ and $492~\mathrm{fb}^{-1}$, respectively. We report the first evidence for the decay $X(3872)\toπ^0χ_{c0}$ with a significance of $3.4σ$, including systematic uncertainties. [...]

Measurements of charge-parity (CP) violation in quark transitions provide stringent tests of the current theory and sensitive probes of particles or interactions beyond it. We report the first measurement of mixing-induced CP violation in $B^0\toπ^0π^0$ decays. [...]

Strain-induced modifications of the electronic structure in 𝑇 𝑑 -Mo0.91 W0.09 Te2 were studied using hard X-ray angle-resolved pho-toemission spectroscopy (HARPES). Partial substitution of Mo with W stabilizes the metastable low-temperature orthorhombic 𝑇 𝑑phase of MoTe2 . [...]

Background Laser-based powder bed fusion (PBF-LB/M) is a manufacturing technique that enables tailoring of the propertiesof components towards the application, provided the process parameters are adjusted. However, the process inducesresidual strain and stresses, influencing, i.e., the fatigue properties. [...]

Identifying synthesis pathways for stabilizing metastable phases of materials and understanding the relationship between optical properties and local symmetry are important for advancing optical materials. In this work, we report a novel combustion synthesis route for two polymorphic structures of Cr3+-doped YInO3 perovskite, namely the hexagonal and cubic (C-type) phases, along with their structural and optical properties. [...]

At the European Free-Electron Laser (EuXFEL) super-conducting linac, a revised normal-conducting gun designwith symmetrical feed was successfully installed and tested.Thermal expansion of the solid copper body dominantlyaffects the detuning transients of this cavity. To improve accuracy, and add time resolution over the duration of a pulse,we implemented and tested an observer that estimates theresonance frequency over time using a parameter-identifiedwhite-box model of the RF network. [...]