A statistical procedure for the identification of positrons in the PAMELA experiment

Details A statistical procedure for the identification of positrons in the PAMELA experiment A statistical procedure for the identification of positrons in the PAMELA experiment

2010-01-20

arxiv.org/abs/1001.3522v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

27 pages, 11 figures, 3 tables

Scientific paper

The PAMELA satellite experiment has measured the cosmic-ray positron fraction between 1.5 GeV and 100 GeV. The need to reliably discriminate between the positron signal and proton background has required the development of an ad hoc analysis procedure. In this paper, a method for positron identification is described and its stability and capability to yield a correct background estimate is shown. The analysis includes new experimental data, the application of three different fitting techniques for the background sample and an estimate of systematic uncertainties due to possible inaccuracies in the background selection. The new experimental results confirm both solar modulation effects on cosmic-rays with low rigidities and an anomalous positron abundance above 10 GeV.

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