Difference between revisions of "Search for CP violation in the gamma-ray sky"

Revision as of 15:45, 19 May 2014

Schema

Illustration of the cut-sky with gamma rays distributed on it. Patches of radius R degrees are centered on the highest energy gamma rays. In those patches we test if the lower energy photons are distributed along left- or right-handed spirals. The statistics Q measures the handedness averaged over all patches in the sky. For more details, refer to "Search for CP violation in the gamma-ray sky", Hiroyuki Tashiro, Wenlei Chen, Francesc Ferrer, and Tanmay Vachaspati, arxiv:1310.4826.

Fermi Data

Fermi Data

Galactic Latitude and Source Cuts

Galactic latitude and Source Cuts

Evaluation of CP Odd Statistic (Q)

Mathematica notebook (Vachaspati) File:Cpgamma-northsouth.nb

Monte Carlo Simulations

Results

CP odd statistics, Qx10^-6, versus patch radius R in degrees for the 6 different energy (E1,E2) combinations. E3 is always taken to be 50 GeV. On the left are results of Tashiro's routines; on the right are consistent results obtained using Ferrer's routines. 1*sigma spreads of the Monte Carlo simulations are shown as magenta error bars. The data points are the results from Fermi data together with 1*sigma standard errors. Points that deviate by more than 2*sigma, where sigma = max{Monte Carlo spread, standard error}, are colored in red.