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Our primary effort at SLAC is the Heavy Photon Search experiment (HPS). During the past year, we proposed the HPS Experiment to JLab. Its first stage, the HPS Test Run experiment. It , has been approved and funded. The HPS Collaboration is hard at work completing designs, building electronics, and beginning construction of the experiment, which will be installed March 2012 at JLab. The experiment will use LHC style readout of silicon microstrip detectors for tracking and vertex reconstruction of e⁺e^- pairs and a PbWO₄ crystal calorimeter to deal with the extremely high trigger rates expected. HPS offers many opportunities for rotation students. Experimental design and simulation studies will continue, tracking pattern recognition and vertexing code is being refined, the data acquisition system for the experiment is being designed and tested, a silicon tracker/vertexer is being built, and the physics analysis is being developed. This experiment is very small by modern standards, but exploits cutting edge detection and readout technologies to address a very fascinating piece of physics. It provides a perfect opportunity for a thesis student, offering all aspects of experimental work, from design to hardware implementation to data analysis. Some specific proposals for Fall 2011 HPS rotation projects are listed below.

Our SLAC group is also involved in the APEX experiment, which has already completed a test run last Summer and presented results of its initial search, excluding a new region of heavy photon parameter space. The experiment makes use of two existing spectrometers in Jlab's experimental Hall A. The experiment hopes to take more data during the 2011-12 JLab cycle. SLAC had responsibility for constructing the target for the experiment, taking shifts, and helping to develop the data analysis. We will continue collaborating on APEX. John Jaros.

Spring/Summer 2011 Projects

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