Antihydrogen detection in ALPHA

Richard Hydomako, Gorm Bruun Andresen, Mohammad Dehghani Ashkezari, Marcelo Baquero-Ruiz, William Bertsche, Eoin Butler, Paul David Bowe, Claudo Lenz Cesar, Steve Chapman, Michael Charlton, Joel Fajans, Tim Friesen, Makoto C. Fujiwara, David Russell Gill, Jeffrey Scott Hangst, Walter Newbold Hardy, Ryugo S. Hayano, Michael Edward Hayden, Andrew James Humphries, Svante JonsellLeonid Kurchaninov, Niels Madsen, Scott Menary, Paul Nolan, Konstantin Olchanski, Arthur Olin, Alexander Povilus, Petteri Pusa, Francis Robicheaux, Elazar Sarid, Daniel Miranda Silveira, Chukman So, James William Storey, Robert Ian Thompson, Dirk Peter van der Werf, Jonathan Syrkin Wurtele, Yasunori Yamazaki

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)91-99
Number of pages9
JournalHyperfine Interactions
Issue number1-3
StatePublished - 1 Dec 2012
Externally publishedYes


  • Antihydrogen
  • Cosmic background rejection
  • Event reconstruction
  • Silicon vertex detector

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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