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Title: The Heavy Photon Search test detector

Abstract

The Heavy Photon Search (HPS), an experiment to search for a hidden sector photon in fixed target electroproduction, is preparing for installation at the Thomas Jefferson National Accelerator Facility (JLab) in the Fall of 2014. As the first stage of this project, the HPS Test Run apparatus was constructed and operated in 2012 to demonstrate the experiment's technical feasibility and to confirm that the trigger rates and occupancies are as expected. This paper describes the HPS Test Run apparatus and readout electronics and its performance. In this setting, a heavy photon can be identified as a narrow peak in the e⁺e⁻invariant mass spectrum above the trident background or as a narrow invariant mass peak with a decay vertex displaced from the production target, so charged particle tracking and vertexing are needed for its detection. In the HPS Test Run, charged particles are measured with a compact forward silicon microstrip tracker inside a dipole magnet. Electromagnetic showers are detected in a PbW04 crystal calorimeter situated behind the magnet, and are used to trigger the experiment and identify electrons and positrons. Both detectors are placed close to the beam line and split top-bottom. This arrangement provides sensitivity to low-mass heavy photons, allowsmore » clear passage of the unscattered beam, and avoids the spray of degraded electrons coming from the target. The discrimination between prompt and displaced e⁺e⁻ pairs requires the first layer of silicon sensors be placed only 10 cm downstream of the target. The expected signal is small, and the trident background huge, so the experiment requires very large statistics. In addition, the HPS Test Run utilizes high-rate readout and data acquisition electronics and a fast trigger to exploit the essentially 100% duty cycle of the CEBAF accelerator at JLab.« less

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1197784
Alternate Identifier(s):
OSTI ID: 1146416; OSTI ID: 1167553
Report Number(s):
SLAC-PUB-15999; JLAB-PHY-14-1994; DOE/OR/23177-3263; arXiv:1406.6115
Journal ID: ISSN 0168-9002; S0168900214014582; PII: S0168900214014582
Grant/Contract Number:  
AC02-76SF00515; DESC0008061; AC05-06OR23177; SC0008061
Resource Type:
Journal Article: Published Article
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Journal Volume: 777 Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; experiment-HEP; HEPEX; silicon; tracking; vertexing; heavy photon; dark photon; electromagnetic calorimeter

Citation Formats

Battaglieri, M., Boyarinov, S., Bueltmann, S., Burkert, V., Celentano, A., Charles, G., Cooper, W., Cuevas, C., Dashyan, N., DeVita, R., Desnault, C., Deur, A., Egiyan, H., Elouadrhiri, L., Essig, R., Fadeyev, V., Field, C., Freyberger, A., Gershtein, Y., Gevorgyan, N., Girod, F. -X., Graf, N., Graham, M., Griffioen, K., Grillo, A., Guidal, M., Haller, G., Hansson Adrian, P., Herbst, R., Holtrop, M., Jaros, J., Kaneta, S., Khandaker, M., Kubarovsky, A., Kubarovsky, V., Maruyama, T., McCormick, J., Moffeit, K., Moreno, O., Neal, H., Nelson, T., Niccolai, S., Odian, A., Oriunno, M., Paremuzyan, R., Partridge, R., Phillips, S. K., Rauly, E., Raydo, B., Reichert, J., Rindel, E., Rosier, P., Salgado, C., Schuster, P., Sharabian, Y., Sokhan, D., Stepanyan, S., Toro, N., Uemura, S., Ungaro, M., Voskanyan, H., Walz, D., Weinstein, L. B., and Wojtsekhowski, B. The Heavy Photon Search test detector. Netherlands: N. p., 2015. Web. doi:10.1016/j.nima.2014.12.017.
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Battaglieri, M., Boyarinov, S., Bueltmann, S., Burkert, V., Celentano, A., Charles, G., Cooper, W., Cuevas, C., Dashyan, N., DeVita, R., Desnault, C., Deur, A., Egiyan, H., Elouadrhiri, L., Essig, R., Fadeyev, V., Field, C., Freyberger, A., Gershtein, Y., Gevorgyan, N., Girod, F. -X., Graf, N., Graham, M., Griffioen, K., Grillo, A., Guidal, M., Haller, G., Hansson Adrian, P., Herbst, R., Holtrop, M., Jaros, J., Kaneta, S., Khandaker, M., Kubarovsky, A., Kubarovsky, V., Maruyama, T., McCormick, J., Moffeit, K., Moreno, O., Neal, H., Nelson, T., Niccolai, S., Odian, A., Oriunno, M., Paremuzyan, R., Partridge, R., Phillips, S. K., Rauly, E., Raydo, B., Reichert, J., Rindel, E., Rosier, P., Salgado, C., Schuster, P., Sharabian, Y., Sokhan, D., Stepanyan, S., Toro, N., Uemura, S., Ungaro, M., Voskanyan, H., Walz, D., Weinstein, L. B., & Wojtsekhowski, B. The Heavy Photon Search test detector. Netherlands. https://doi.org/10.1016/j.nima.2014.12.017
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Battaglieri, M., Boyarinov, S., Bueltmann, S., Burkert, V., Celentano, A., Charles, G., Cooper, W., Cuevas, C., Dashyan, N., DeVita, R., Desnault, C., Deur, A., Egiyan, H., Elouadrhiri, L., Essig, R., Fadeyev, V., Field, C., Freyberger, A., Gershtein, Y., Gevorgyan, N., Girod, F. -X., Graf, N., Graham, M., Griffioen, K., Grillo, A., Guidal, M., Haller, G., Hansson Adrian, P., Herbst, R., Holtrop, M., Jaros, J., Kaneta, S., Khandaker, M., Kubarovsky, A., Kubarovsky, V., Maruyama, T., McCormick, J., Moffeit, K., Moreno, O., Neal, H., Nelson, T., Niccolai, S., Odian, A., Oriunno, M., Paremuzyan, R., Partridge, R., Phillips, S. K., Rauly, E., Raydo, B., Reichert, J., Rindel, E., Rosier, P., Salgado, C., Schuster, P., Sharabian, Y., Sokhan, D., Stepanyan, S., Toro, N., Uemura, S., Ungaro, M., Voskanyan, H., Walz, D., Weinstein, L. B., and Wojtsekhowski, B. 2015. "The Heavy Photon Search test detector". Netherlands. https://doi.org/10.1016/j.nima.2014.12.017.
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@article{osti_1197784,
title = {The Heavy Photon Search test detector},
author = {Battaglieri, M. and Boyarinov, S. and Bueltmann, S. and Burkert, V. and Celentano, A. and Charles, G. and Cooper, W. and Cuevas, C. and Dashyan, N. and DeVita, R. and Desnault, C. and Deur, A. and Egiyan, H. and Elouadrhiri, L. and Essig, R. and Fadeyev, V. and Field, C. and Freyberger, A. and Gershtein, Y. and Gevorgyan, N. and Girod, F. -X. and Graf, N. and Graham, M. and Griffioen, K. and Grillo, A. and Guidal, M. and Haller, G. and Hansson Adrian, P. and Herbst, R. and Holtrop, M. and Jaros, J. and Kaneta, S. and Khandaker, M. and Kubarovsky, A. and Kubarovsky, V. and Maruyama, T. and McCormick, J. and Moffeit, K. and Moreno, O. and Neal, H. and Nelson, T. and Niccolai, S. and Odian, A. and Oriunno, M. and Paremuzyan, R. and Partridge, R. and Phillips, S. K. and Rauly, E. and Raydo, B. and Reichert, J. and Rindel, E. and Rosier, P. and Salgado, C. and Schuster, P. and Sharabian, Y. and Sokhan, D. and Stepanyan, S. and Toro, N. and Uemura, S. and Ungaro, M. and Voskanyan, H. and Walz, D. and Weinstein, L. B. and Wojtsekhowski, B.},
abstractNote = {The Heavy Photon Search (HPS), an experiment to search for a hidden sector photon in fixed target electroproduction, is preparing for installation at the Thomas Jefferson National Accelerator Facility (JLab) in the Fall of 2014. As the first stage of this project, the HPS Test Run apparatus was constructed and operated in 2012 to demonstrate the experiment's technical feasibility and to confirm that the trigger rates and occupancies are as expected. This paper describes the HPS Test Run apparatus and readout electronics and its performance. In this setting, a heavy photon can be identified as a narrow peak in the e⁺e⁻invariant mass spectrum above the trident background or as a narrow invariant mass peak with a decay vertex displaced from the production target, so charged particle tracking and vertexing are needed for its detection. In the HPS Test Run, charged particles are measured with a compact forward silicon microstrip tracker inside a dipole magnet. Electromagnetic showers are detected in a PbW04 crystal calorimeter situated behind the magnet, and are used to trigger the experiment and identify electrons and positrons. Both detectors are placed close to the beam line and split top-bottom. This arrangement provides sensitivity to low-mass heavy photons, allows clear passage of the unscattered beam, and avoids the spray of degraded electrons coming from the target. The discrimination between prompt and displaced e⁺e⁻ pairs requires the first layer of silicon sensors be placed only 10 cm downstream of the target. The expected signal is small, and the trident background huge, so the experiment requires very large statistics. In addition, the HPS Test Run utilizes high-rate readout and data acquisition electronics and a fast trigger to exploit the essentially 100% duty cycle of the CEBAF accelerator at JLab.},
doi = {10.1016/j.nima.2014.12.017},
url = {https://www.osti.gov/biblio/1197784}, journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
issn = {0168-9002},
number = C,
volume = 777,
place = {Netherlands},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}
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