\title{The Heavy Photon Search Experiment at Jefferson Lab}

\author{Sho Uemura\\SLAC National Accelerator Laboratory\\for the HPS Collaboration}

\date{}
%\date{January 9, 2015}

\documentclass[12pt]{article}
\usepackage{fullpage}
\begin{document}
\maketitle
\begin{abstract}
	The Heavy Photon Search (HPS) is a new experiment at Jefferson Lab searching for 
	massive U(1) vector bosons (also known as heavy photons, dark photons, or $A'$)
	of mass 20--1000 MeV that couple to electric charge with relative coupling $\alpha'/\alpha$ of $10^{-5}$--$10^{-10}$.

	The HPS experiment is designed to produce heavy photons in a process analoguous to bremsstrahlung using an electron beam on a fixed target, and 
	detect decays to $e^+e^-$ pairs with two signatures (invariant mass resonance and displaced decay vertex).
	The detector is a compact, large-acceptance forward spectrometer 
	comprising a silicon microstrip tracker for momentum measurement and vertexing and an electromagnetic calorimeter for triggering on $e^+e^-$.
	
	Precise beamline controls, high-rate trigger and DAQ, and good time resolution 
	are needed for a detector that comes within 0.5 mm of the beam and is sensitive down to $\pm$ 15 mrad from the beam plane, 
	and must cope with the intense beam background in this environment.
	A low-mass tracker and clean track reconstruction are needed for the best sensitivity.
	
	This talk will describe the HPS experiment and its current status after test, commissioning, and engineering runs.
\end{abstract}

\end{document}