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The strength and sign of the gravitational interaction between matter and antimatter (so-called "antigravity") is still an open experimental question. I will discuss some arguments and measurements which shed light on the issue. Finally, I will describe planned antigravity experiments involving antihydrogen with an emphasis on the ALPHA experiment at CERN.
Scott Menary (Ph.D., Toronto) is an experimental particle physicist. He has been involved in experiments performed at the e+e- colliders CESR at Cornell and LEP at CERN as well as the ep collider HERA at the DESY Laboratory in Hamburg. He worked on the design of the NuMI neutrino beam facility at Fermilab outside Chicago and he was one of the original members of the BTeV p-pbar collider experiment at Fermilab. Presently he concentrates his efforts on the ALPHA antihydrogen trapping experiment done at the Antiproton Decelerator facility at CERN.
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Indigenous Initiatives Office.