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Annihilation at rest of antiprotons and protons into neutral particles


Amsler, C; et al (2003). Annihilation at rest of antiprotons and protons into neutral particles. Nuclear Physics A, 720(3-4):357-367.

Abstract

Annihilation of antiprotons and protons at rest into neutral particles has been studied with the Crystal Barrel detector at LEAR. Annihilation frequencies are determined for final states containing !0, ", "" and # mesons using a liquid and a room temperature, 12 bar, gaseous hydrogen target. Including annihilation frequencies for production of neutral kaons from other experiments, the identified reactions for annihilation in liquid hydrogen add up to a branching fraction of (3.56 ± 0.28)% per annihilation compared to the frequency of (3.50±0.30)%withwhichwe observe the allneutral decay modes inclusively. Since the exclusive final states are normalized to the Crystal Barrel measurement of the !0!0 branching ratio, the latter result is strongly supported by this present study.

Abstract

Annihilation of antiprotons and protons at rest into neutral particles has been studied with the Crystal Barrel detector at LEAR. Annihilation frequencies are determined for final states containing !0, ", "" and # mesons using a liquid and a room temperature, 12 bar, gaseous hydrogen target. Including annihilation frequencies for production of neutral kaons from other experiments, the identified reactions for annihilation in liquid hydrogen add up to a branching fraction of (3.56 ± 0.28)% per annihilation compared to the frequency of (3.50±0.30)%withwhichwe observe the allneutral decay modes inclusively. Since the exclusive final states are normalized to the Crystal Barrel measurement of the !0!0 branching ratio, the latter result is strongly supported by this present study.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2003
Deposited On:04 Nov 2011 12:52
Last Modified:22 Nov 2017 12:39
Publisher:Elsevier
ISSN:0375-9474
Publisher DOI:https://doi.org/10.1016/S0375-9474(03)00912-6

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