A. Selce

TL;DR: A search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider finds no evidence for ALPs and sets 95% confidence level upper limits on the coupling strength g_{aγγ} of ALPs to photons at the level of 10^{-3} GeV^{-1}.

TL;DR: The first searches for the invisible decay of a Z^{'} in the process e^{+}e^{-}→μ+}μ-}Z{'} and of a lepton-flavor-violating Z^{ GeV/c^{2} in e-→-e^{±}μ^{∓}Z^{'}.

TL;DR: In this article, the first data sample of the Belle II experiment at the SuperKEKB electron-positron collider was collected using Bhabha and digamma events and measured the integrated luminosity of the data sample to be (496.3 ± 0.0) pb-1, where the first uncertainty is statistical and the second is systematic.

TL;DR: In this article, the first data sample of the Belle~II experiment at the SuperKEKB electron-positron collider was collected using Bhabha and digamma events, and the integrated luminosity of the data sample was measured to be ($496.3 \pm 0.0$)~pb$^{-1}$, where the first uncertainty is statistical and the second is systematic.

TL;DR: In this paper , the performance of the laser induced breakdown spectroscopy system has been demonstrated and the new capabilities of the runaway electron imaging spectrometry system for in-flight runaway studies have been explored.