CERN Accelerating science

Published Articles
Title	Recent Developments from ASACUSA on Antihydrogen Detection
Author(s)	Kolbinger, B (Stefan Meyer Inst. Subatomare Phys.) ; Amsler, C (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, H (Nishina Ctr., RIKEN) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Dupré, P (Nishina Ctr., RIKEN) ; Fleck, M (Stefan Meyer Inst. Subatomare Phys.) ; Gligorova, A (Stefan Meyer Inst. Subatomare Phys.) ; Higaki, H (Hiroshima U.) ; Kanai, Y (Nishina Ctr., RIKEN) ; Kobayashi, T (Tokyo U.) ; Leali, M (INFN, Pavia ; Pavia U.) ; Mäckel, V (Stefan Meyer Inst. Subatomare Phys.) ; Malbrunot, C (CERN ; Stefan Meyer Inst. Subatomare Phys.) ; Mascagna, V (INFN, Pavia ; Pavia U.) ; Massiczek, O (Stefan Meyer Inst. Subatomare Phys.) ; Matsuda, Y (Tokyo U.) ; Murtagh, D j (Stefan Meyer Inst. Subatomare Phys.) ; Nagata, Y (Tokyo U. of Sci.) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Simon, M C (Stefan Meyer Inst. Subatomare Phys.) ; Tajima, M (Nishina Ctr., RIKEN) ; Ulmer, S (Nishina Ctr., RIKEN) ; Kuroda, N (Tokyo U.) ; Venturelli, L (INFN, Pavia ; Pavia U.) ; Widmann, E (Stefan Meyer Inst. Subatomare Phys.) ; Yamazaki, Y (Nishina Ctr., RIKEN) ; Zmeskal, J (Stefan Meyer Inst. Subatomare Phys.)
Collaboration	Asacusa
Publication	2018
Number of pages	6
In:	EPJ Web Conf. 181 (2018) 01003
In:	International Conference on Exotic Atoms and Related Topics (EXA 2017), Vienna, Austria, 11 - 15 Sep 2017, pp.01003
DOI	10.1051/epjconf/201818101003
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN ASACUSA
Abstract	The ASACUSA Collaboration at CERNs Antiproton Decelerator aims to measure the ground state hyperfine splitting of antihydrogen with high precision to test the fundamental symmetry of CPT (combination of charge conjugation, parity transformation, and time reversal). For this purpose an antihydrogen detector has been developed. Its task is to count the arriving antihydrogen atoms and therefore distinguish backgroundevents (mainly cosmics) from antiproton annihilations originating from antihydrogen atoms which are produced only in small amounts. A central BGO crystal disk with position sensitive read-out detects the annihilation and a surrounding two-layered hodoscope is used for tracking charged secondaries. The hodoscope has been recently upgraded to allow precise vertex reconstruction. A machine learning analysis based on measured antiproton annihilations and cosmic rays has been developed to identify antihydrogen events.
Copyright/License	CC-BY-4.0

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