These plots display the same information as those found in Run 11 Beam Background Study: Eta Phi Correlation of Events with Hits in Endcap and Barrel.  The plots have been changed from Eta-Phi space to X-Y space in an effort to see if the geometry of the detector can give insight into the source of the background.

The plots on the left show hits in the endcap during L2BW triggers for which no vertex was reconstructed. The plots on the right show hits during L2EW triggers under the same conditions.  From top to bottom the plots below are for 7-bit bXing = [0,30] , [31,39] , [40,110] , [111,119].