Tran - DESY Theory workshop 2008
Tran - DESY Theory workshop 2008
Tran - DESY Theory workshop 2008
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The Positron Fraction<br />
Experiments usually measure the positron fraction<br />
HEAT measured an excess in the positron fraction that cannot be<br />
explained by standard production and propagation models<br />
Positron fraction e + /(e + + e − )<br />
0.1<br />
HEAT 94/95/00<br />
AMS-01 98<br />
CAPRICE 94<br />
MASS 91<br />
Background only<br />
0.01<br />
1 10 100 1000<br />
T [GeV]<br />
Preliminary results from PAMELA seem to support an excess of<br />
positrons at higher energies!<br />
David <strong>Tran</strong><br />
Indirect Signatures of Gravitino Dark Matter with Broken R-Parity
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