1. Antihydrogen detection in ALPHA
- Author
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A. Olin, William Bertsche, E. Sarid, P. J. Nolan, M. C. Fujiwara, Richard Hydomako, Niels Madsen, Eoin Butler, Robert Thompson, A. Povilus, M. E. Hayden, Claudo Lenz Cesar, M. D. Ashkezari, Leonid Kurchaninov, M. Charlton, K. Olchanski, Marcelo Baquero-Ruiz, Francis Robicheaux, Steve Chapman, D. R. Gill, Jonathan Wurtele, J. S. Hangst, A. J. Humphries, P. D. Bowe, W. N. Hardy, Svante Jonsell, Petteri Pusa, S. Menary, T. Friesen, Dirk Peter van der Werf, Chukman So, Gorm Bruun Andresen, D. M. Silveira, James William Storey, Ryugo S. Hayano, Yasunori Yamazaki, and Joel Fajans
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Annihilation ,Large Hadron Collider ,Physics::Instrumentation and Detectors ,Detector ,Condensed Matter Physics ,Tracking (particle physics) ,Atomic and Molecular Physics, and Optics ,Nuclear physics ,Trapping region ,Physics::Atomic Physics ,Physical and Theoretical Chemistry ,Antihydrogen ,Image resolution ,Event reconstruction - Abstract
The ALPHA project is an international collaboration, based at CERN, with the experimental goal of performing precision spectroscopic measurements on antihydrogen. As part of this endeavor, the ALPHA experiment includes a silicon tracking detector. This detector consists of a three-layer array of silicon modules surrounding the antihydrogen trapping region of the ALPHA apparatus. Using this device, the antihydrogen annihilation position can be determined with a spatial resolution of better than 5 mm. Knowledge of the annihilation distribution was a critical component in the recently successful antihydrogen trapping effort. This paper will describe the methods used to reconstruct annihilation events in the ALPHA detector. Particular attention will be given to the description of the background rejection criteria.
- Published
- 2011