SDDE = (ITW and not BBC West and not ZDC West) and (BBC East or ZDC East) 

SDDW= (ITE and not BBC East and not ZDC East) and (BBC West or ZDC West)

I've been looking at some data and see some strange events.  For example, I see many events which passed the single diffractive triggers but have nothing in either BBC or ZDC.  Here are some examples:

Run number 10181007 event number 2099 passed 1 triggers: 4
East ZDC ADC sum 0
West ZDC ADC sum 0
BBC Values:
East BBC hits are: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 //all tiles (small are 1- 16)
West BBC hits are: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Run number 10181007 event number 6341 passed 1 triggers: 3
East ZDC ADC sum 0
West ZDC ADC sum 0
BBC Values:
East BBC hits are: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
West BBC hits are: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

I also see events with hits in the BBC or ZDC on the side that should be vetoed.  Here are some examples:

Run number 10181007 event number 129 passed 1 triggers: 4
East ZDC ADC sum 0
West ZDC ADC sum 0
BBC Values:
East BBC hits are: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 61  //maybe ok because it is an outer tile?
West BBC hits are: 61 152 0 0 0 0 191 0 0 13 0 0 0 0 0 0 93 0 67 86 0 401 253 2

Run number 10181007 event number 2554 passed 1 triggers: 3
East ZDC ADC sum 3
West ZDC ADC sum 8  //was this below some min cut?
BBC Values:
East BBC hits are: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
West BBC hits are: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0