I don't have enough information to provide a direct answer based on the search results. The provided text is about a search for vector-like quarks, but it doesn't mention "Data Background" specifically.

However, I can tell you that in general knowledge, "background" refers to the unwanted or uninteresting data that can affect the accuracy of scientific experiments and analyses. In the context of particle physics, background noise can come from various sources such as cosmic rays, beam spills, or other types of radiation.

If you could provide more context or clarify what you mean by "Data Background," I'll do my best to help.