of Delaware, Newark , DE, USA www.mpifr-bonn.mpg.de/div/theory 2 Cosmic ray electrons and positrons: new data � Pamela : 0810.4995: positron fraction increasing with energy � ATIC: Nature 456 , 362 (2008): �flat� feature in cosmic ray electrons � H.E.S.S.: 0811.3894 : �steep� feature in cosmic ray elec trons 3 Figure 1 Pamela data on positron fraction, 2008 4 Figure 2 ATIC data on cosmic ray electrons, 2008; open triangles background 5 Figure 3 H.E.S.S.
data on cosmic ray electrons, 2008 6 Some ...
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