beam polarization of electrons and positrons
Hello,
I have a question please.
When i generate the e-e+ -> ttbar process, by default the polarization of the beam 1 (e-) and beam 2 (e+) are set to zero in the run card, it means that 50% of the electrons (positrons) are Left handed, and 50% are right-handed, which means that the beams are not polarized.
If it is correct, the problem is that when i plot the helicity histogram, i find out that the beams are polarized ! i don't understand why.. for the electron beam the number of right handed particle are more than the left handed particle, and vise versa for the positron beam.
Can you please explain to me why is that ?
Thank you,
Best regards.
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