Development of a Vertex Finding Algorithm using Recurrent Neural Network

Deep learning is a rapidly-evolving technology with possibility to significantly improve physics reach of collider experiments. In this study we developed a novel algorithm of vertex finding for future lepton colliders such as the International Linear Collider. We deploy two networks; one is simple fully-connected layers to look for vertex seeds from track pairs, and the other is a customized Recurrent Neural Network with an attention mechanism and an encoder-decoder structure to associate tracks to the vertex seeds. The performance of the vertex finder is compared with the standard ILC reconstruction algorithm.Comment: 8 pages, 8 figures, preliminary version currently under review by IL

Chromosome 4q;10q translocations; Comparison with different ethnic populations and FSHD patients

BACKGROUND: Facioscapulohumeral muscular dystrophy (FSHD) is an autosomal dominant disorder characterized by the weakness of facial, shoulder-girdle and upper arm muscles. Most patients with FSHD have fewer numbers of tandem repeated 3.3-kb KpnI units on chromosome 4q35. Chromosome 10q26 contains highly homologous KpnI repeats, and inter-chromosomal translocation has been reported. METHODS: To clarify the influence on the deletion of the repeats, we surveyed three different ethnic populations and FSHD patients using the BglII/BlnI dosage test. RESULTS: The frequency of translocation in 153 Japanese, 124 Korean, 114 Chinese healthy individuals and 56 Japanese 4q35-FSHD patients were 27.5%, 29.8%, 19.3%, and 32.1%, respectively. The ratio of '4 on 10' (trisomy and quatrosomy of chromosome 4) was higher than that of '10 on 4' (nullsomy and monosomy of chromosome 4) in all populations. CONCLUSIONS: The inter-chromosomal exchange was frequently observed in all four populations we examined, and no significant difference was observed between healthy and diseased groups

Preparation and operation of SiW-ECAL technological prototype for DESY test beam 2019

We are developing SiW-ECAL technological prototypes with the aim of optimizing readout structure for $e^+e^-$ linear collider application. Developments are being carried out under the cooperation of LAL, LLR and Kyushu University. In this paper, we report the development status of FEV13, the latest version of the technological prototypes, following improvements from the previous versions. Several beam tests have been conducted so far for this FEV13 performance test. Most recently, beam test was conducted with electron beam (1-5 GeV) at DESY in Germany from June to July 2019. We mainly report on the setup and various operation tests of FEV13 during this beam test

Analysis of SiW-ECAL technological prototype beam test with electron beam

The beam test for the SiW-ECAL technological prototype was conducted using electron beam in June-July 2019 at DESY test beam facility in Hamburg, Germany. In the beam test, there were two main programs: MIP program (without tungsten) and shower program (with tungsten). The purposes of the MIP program are energy calibration, pedestal uniformity/stability assessment, TDC operation test, and retrigger verification. On the other hand, the shower program aims to evaluate energy resolution through beam energy measurement. In addition, several operation tests with FEV13 were also conducted such as individual threshold control and auto gain mode. This article presents the performance of the technological prototype of SiW-ECAL, mainly focusing on the version of FEV13-Jp