The e± cosmic-ray anomaly

Katie Auchettl, Csaba Balazs

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


We extract the anomalous part of the cosmic e± flux via a Bayesian likelihood analysis using 219 cosmic ray data points. First we show that serious tension exists between the e± fluxes and the rest of the data. Interpreting this tension as an effect of an anomalous component on the e±data, we infer the values of selected cosmic ray propagation parameters by excluding the e± data from the analysis. Based on these values we calculate background predictions with theoretical uncertainties for PAMELA and Fermi-LAT. We find a statistically significant deviation between the Fermi-LAT e− +e+ data and the predicted background even when systematic uncertainties are taken into account. Identifying this deviation as an anomalous e± contribution we show that increased precision is required to distinguish between various sources that may be responsible for this contribution.
Original languageEnglish
Title of host publication36th International Conference on High Energy Physics, Proceedings
Place of PublicationItaly
PublisherProceedings of Science
Number of pages6
Publication statusPublished - 2013
Event36th International Conference on High Energy Physics, ICHEP 2012 - Melbourne, Australia
Duration: 4 Jul 201211 Jul 2012

Publication series

NameProceedings of Science
PublisherScuola Internazionale Superiore di Studi Avanzati (S I S S A)
ISSN (Print)1824-8039


Conference36th International Conference on High Energy Physics, ICHEP 2012


  • Dark matter
  • Positron fraction
  • Cosmic rays

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