<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi All,</div><div><br></div><div>The test run nim paper is now on arxiv. Please see look at your name and see if it's correct (I already had one issue). There is a passw below if you want to claim ownership.</div><div><br></div><div>Thanks,</div><div><br></div><div>/Pelle<br><br></div><div><br>Begin forwarded message:<br><br></div><blockquote type="cite"><div><b>From:</b> "<a href="mailto:e-prints@arxiv.org">e-prints@arxiv.org</a>" <<a href="mailto:e-prints@arxiv.org">e-prints@arxiv.org</a>><br><b>Date:</b> June 24, 2014 at 17:13:07 PDT<br><b>To:</b> "Hansson Adrian, Per Ola" <<a href="mailto:phansson@slac.stanford.edu">phansson@slac.stanford.edu</a>><br><b>Subject:</b> <b>arXiv New submission -> 1406.6115 in physics.ins-det from <a href="mailto:phansson@slac.stanford.edu">phansson@slac.stanford.edu</a></b><br><b>Reply-To:</b> "<a href="mailto:help@arxiv.org">help@arxiv.org</a>" <<a href="mailto:help@arxiv.org">help@arxiv.org</a>><br><br></div></blockquote><blockquote type="cite"><div><span>Your submission submit/1007032 has been assigned the permanent arXiv</span><br><span>identifier 1406.6115 and is available at:</span><br><span></span><br><span><a href="http://arxiv.org/abs/1406.6115">http://arxiv.org/abs/1406.6115</a></span><br><span></span><br><span></span><br><span>The paper password for this article is: xm9cp</span><br><span>Please share this with your co-authors. They may use it to claim</span><br><span>ownership.</span><br><span></span><br><span></span><br><span>Abstract will appear in today's mailing as:</span><br><span>------------------------------------------------------------------------------</span><br><span>\\</span><br><span>arXiv:1406.6115</span><br><span>From: Per Hansson Adrian <<a href="mailto:phansson@slac.stanford.edu">phansson@slac.stanford.edu</a>></span><br><span>Date: Tue, 24 Jun 2014 00:51:56 GMT (5017kb,D)</span><br><span></span><br><span>Title: The Heavy Photon Search Test Detector</span><br><span>Authors: Marco Battaglieri, Sergey Boyarinov, Stephen Bueltmann, Volker</span><br><span> Burkert, Andrea Celentano, Gabriel Charles, William Cooper, Chris Cuevas,</span><br><span> Natalia Dashyan, Raffaella DeVita, Camille Desnault, Alexandre Deur, Hovanes</span><br><span> Egiyan, Latifa Elouadrhiri, Rouven Essig, Vitaliy Fadeyev, Clive Field, Arne</span><br><span> Freyberger, Yuri Gershtein, Nerses Gevorgyan, Francois-Xavier Girod, Norman</span><br><span> Graf, Matthew Graham, Keith Griffioen, Alexander Grillo, Michel Guidal,</span><br><span> Gunther Haller, Per Hansson Adrian, Ryan Herbst, Maurik Holtrop, John Jaros,</span><br><span> Scott Kaneta, Mahbub Khandaker, Alexey Kubarovsky, Valery Kubarovsky, Takashi</span><br><span> Maruyama, Jeremy McCormick, Ken Moffeit, Omar Moreno, Homer Neal, Timothy</span><br><span> Nelson, Silvia Niccolai, Al Odian, Marco Oriunno, Rafayel Paremuzyan, Richard</span><br><span> Partridge, Sarah Phillips, Emmanuel Rauly, Benjamin Raydo, Joseph Reichert,</span><br><span> Emmanuel Rindel, Philippe Rosier, Carlos Salgado, Philip Schuster, Youri</span><br><span> Sharabian, Daria Sokhan, Stepan Stepanyan, Natalia Toro, Sho Uemura, Maurizio</span><br><span> Ungaro, Hakop Voskanyan, Dieter Walz, Larry Weinstein, Bogdan Wojtsekhowski</span><br><span>Categories: physics.ins-det hep-ex</span><br><span>Comments: 15 pages, 18 figures, to be published in Nuclear Instruments and</span><br><span> Methods in Physics Research Section A, editor: Per Hansson Adrian</span><br><span>Report-no: SLAC-PUB-15999</span><br><span>License: <a href="http://arxiv.org/licenses/nonexclusive-distrib/1.0/">http://arxiv.org/licenses/nonexclusive-distrib/1.0/</a></span><br><span>\\</span><br><span> The Heavy Photon Search (HPS), an experiment to search for a hidden sector</span><br><span>photon in fixed target electroproduction, is preparing for installation at the</span><br><span>Thomas Jefferson National Accelerator Facility (JLab) in the Fall of 2014. As</span><br><span>the first stage of this project, the HPS Test Run apparatus was constructed and</span><br><span>operated in 2012 to demonstrate the experiment's technical feasibility and to</span><br><span>confirm that the trigger rates and occupancies are as expected. This paper</span><br><span>describes the HPS Test Run apparatus and readout electronics and its</span><br><span>performance. In this setting, a heavy photon can be identified as a narrow peak</span><br><span>in the e$^+$e$^-$ invariant mass spectrum, above the trident background or as a</span><br><span>narrow invariant mass peak with a decay vertex displaced from the production</span><br><span>target, so charged particle tracking and vertexing are needed for its</span><br><span>detection. In the HPS Test Run, charged particles are measured with a compact</span><br><span>forward silicon microstrip tracker inside a dipole magnet. Electromagnetic</span><br><span>showers are detected in a PbW0$_{4}$ crystal calorimeter situated behind the</span><br><span>magnet, and are used to trigger the experiment and identify electrons and</span><br><span>positrons. Both detectors are placed close to the beam line and split</span><br><span>top-bottom. This arrangement provides sensitivity to low-mass heavy photons,</span><br><span>allows clear passage of the unscattered beam, and avoids the spray of degraded</span><br><span>electrons coming from the target. The discrimination between prompt and</span><br><span>displaced e$^+$e$^-$ pairs requires the first layer of silicon sensors be</span><br><span>placed only 10~cm downstream of the target. The expected signal is small, and</span><br><span>the trident background huge, so the experiment requires very large statistics.</span><br><span>Accordingly, the HPS Test Run utilizes high-rate readout and data acquisition</span><br><span>electronics and a fast trigger to exploit the essentially 100% duty cycle of</span><br><span>the CEBAF accelerator at JLab.</span><br><span>\\</span><br><span></span><br><span></span><br><span>Contains:</span><br><span> 2012-101-PHOTON-DETECTOR-001.jpg: 353797 bytes</span><br><span> ECal.png: 89789 bytes</span><br><span> HPS_nochamber.jpg: 649009 bytes</span><br><span> IMG_5200.JPG: 2445145 bytes</span><br><span> author_list_hps_PAC39_compact_alphabetical_order.tex: 4216 bytes</span><br><span> ecal-module-schematic.png: 189529 bytes</span><br><span> elsarticle.cls: 26095 bytes</span><br><span> h_cl_E_probedata_eff_bay_h_cl_E_probeMC_eff_bay_dataMC_1351-v7-trig-tagBot.pdf: 16850 bytes</span><br><span> h_ep_data_0_h_ep_MC_0_dataMC_1351-v6-v6gains_2-trig-top-cl600reg0.pdf: 18198 bytes</span><br><span> h_invM_h_invM_trigsel4hit_pair1351_twotrkfilt-v6-paper-mod.pdf: 17863 bytes</span><br><span> h_sumE_h_sumE_trigsel4hit_pair1351_twotrkfilt-v6-paper.pdf: 16802 bytes</span><br><span> h_trk_top_fr_conv_y_h_trk_top_conv_y_dataMC_twotrksel-mod.pdf: 18781 bytes</span><br><span> h_trk_top_fr_conv_z_h_trk_top_conv_z_dataMC_twotrksel-mod.pdf: 17444 bytes</span><br><span> h_trk_top_px_h_trk_top_px_trigsel4hit_pair1351_twotrkfilt-v6-paper-mod.pdf: 18294 bytes</span><br><span> hps-testrun-beamline-edited3.png: 136272 bytes</span><br><span> hps-testrun-nim.bbl: 9285 bytes</span><br><span> hps-testrun-nim.tex: 60893 bytes</span><br><span> hps-testrun-nim.toc: 1703 bytes</span><br><span> hps_testrun_rendering_2.jpeg: 205123 bytes</span><br><span> hps_trigger_cal.pdf: 64743 bytes</span><br><span> mip_top_layer_2.png: 52522 bytes</span><br><span> model1-num-names.bst: 28801 bytes</span><br><span> run1351_110513_samples_L1_top.pdf: 344374 bytes</span><br><span> run1351_time_residual_top_layer2.pdf: 21954 bytes</span><br><span> single_hit_efficiency.pdf: 14943 bytes</span><br><span> svt-daq-sketch.pdf: 100651 bytes</span><br><span> svt_daq_module.png: 559300 bytes</span><br><span></span><br><span></span><br></div></blockquote></body></html>