Beam helicity
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Intro
The LPOL is capable of measuring the helicity of the lepton beam. The sign of the polarization measured by the LPOL can therefore be used as an indicator of the helicity. Care has to be taken when changing the sign of the leptons from electrons to positrons.
Essentials
The helicity of the lepton beam for the different running periods is summarized in the following table.
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Obtaining beam helicity from uDST
This email from Elke describes how to obtain the beam helicity from the uDST entries.
More info
The information about the beam helicity can be found on the summary pages for every year, collected on the uDST documentation page.
Other beam related pages