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Title: The P2 experiment: A future high-precision measurement of the weak mixing angle at low momentum transfer

Abstract

Here we describe the research and development work for the P 2 experiment which aims for a high precision determination of the weak mixing angle sin 2θ W to a precision of 0.15% at a four-momentum transfer of 4.5×10 –3 GeV 2. This accuracy, comparable to existing measurements at the Z pole, allows for a sensitive test of the Standard Model up to a mass scale of 50 TeV, extendable to 60 TeV. The weak mixing angle is connected to the weak charge of the proton which will be extracted from a measurement of the parity violating cross section asymmetry –39.94×10 –9 in elastic electron-proton scattering. A total accuracy of 0.57×10 –9 is achievable in a measurement time of 11000 h using a 150μA polarized electron beam impinging on a 60 cm liquid hydrogen target. The P 2 asymmetry is smaller than any asymmetry measured so far in electron scattering with an unprecedented goal for the accuracy. The use of a solenoid spectrometer with 100% Φ-acceptance as well as an atomic hydrogen trap polarimeter are new features, which have never before been used in parity-violation experiments. In order to collect the enormous statistics required for this measurement, the new Mainzmore » Energy-Recovering Superconducting Accelerator (MESA) is under construction. Plans for the associated beam control system and the polarimetry are described in this article as well. A liquid hydrogen high-power target with an extremely low noise level of 10 ppm needs to be designed and constructed. We report in addition on the conceptual design of the P 2 spectrometer, its Cherenkov detectors, the integrating read-out electronics as well as the ultra-thin, fast tracking detectors. The physics program of the MESA facility comprises indirect, high precision search for physics beyond the Standard Model, measurement of the neutron distribution in nuclear physics, single-spin asymmetries, and a possible future extension to the measurement of hadronic parity violation.« less

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1500103
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
European Physical Journal. A
Additional Journal Information:
Journal Volume: 54; Journal Issue: 11; Journal ID: ISSN 1434-6001
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Becker, Dominik, Bucoveanu, Razvan, Grzesik, Carsten, Imai, Kathrin, Kempf, Ruth, Molitor, Matthias, Tyukin, Alexey, Zimmermann, Marco, Armstrong, David, Aulenbacher, Kurt, Baunack, Sebastian, Beminiwattha, Rakitha, Berger, Niklaus, Bernhard, Peter, Brogna, Andrea, Capozza, Luigi, Covrig Dusa, Silviu, Deconinck, Wouter, Diefenbach, Jürgen, Dunne, James, Erler, Jens, Gal, Ciprian, Gericke, Michael, Gläser, Boris, Gorchtein, Mikhail, Gou, Boxing, Gradl, Wolfgang, Imai, Yoshio, Kumar, Krishna S., Maas, Frank, Mammei, Juliette, Pan, Jie, Pandey, Preeti, Paschke, Kent, Perić, Ivan, Pitt, Mark, Rahman, Sakib, Riordan, Seamus, Rodríguez Piñeiro, David, Sfienti, Concettina, Sorokin, Iurii, Souder, Paul, Spiesberger, Hubert, Thiel, Michaela, Tyukin, Valery, and Weitzel, Quirin. The P2 experiment: A future high-precision measurement of the weak mixing angle at low momentum transfer. United States: N. p., 2018. Web. doi:10.1140/epja/i2018-12611-6.
Becker, Dominik, Bucoveanu, Razvan, Grzesik, Carsten, Imai, Kathrin, Kempf, Ruth, Molitor, Matthias, Tyukin, Alexey, Zimmermann, Marco, Armstrong, David, Aulenbacher, Kurt, Baunack, Sebastian, Beminiwattha, Rakitha, Berger, Niklaus, Bernhard, Peter, Brogna, Andrea, Capozza, Luigi, Covrig Dusa, Silviu, Deconinck, Wouter, Diefenbach, Jürgen, Dunne, James, Erler, Jens, Gal, Ciprian, Gericke, Michael, Gläser, Boris, Gorchtein, Mikhail, Gou, Boxing, Gradl, Wolfgang, Imai, Yoshio, Kumar, Krishna S., Maas, Frank, Mammei, Juliette, Pan, Jie, Pandey, Preeti, Paschke, Kent, Perić, Ivan, Pitt, Mark, Rahman, Sakib, Riordan, Seamus, Rodríguez Piñeiro, David, Sfienti, Concettina, Sorokin, Iurii, Souder, Paul, Spiesberger, Hubert, Thiel, Michaela, Tyukin, Valery, & Weitzel, Quirin. The P2 experiment: A future high-precision measurement of the weak mixing angle at low momentum transfer. United States. doi:10.1140/epja/i2018-12611-6.
Becker, Dominik, Bucoveanu, Razvan, Grzesik, Carsten, Imai, Kathrin, Kempf, Ruth, Molitor, Matthias, Tyukin, Alexey, Zimmermann, Marco, Armstrong, David, Aulenbacher, Kurt, Baunack, Sebastian, Beminiwattha, Rakitha, Berger, Niklaus, Bernhard, Peter, Brogna, Andrea, Capozza, Luigi, Covrig Dusa, Silviu, Deconinck, Wouter, Diefenbach, Jürgen, Dunne, James, Erler, Jens, Gal, Ciprian, Gericke, Michael, Gläser, Boris, Gorchtein, Mikhail, Gou, Boxing, Gradl, Wolfgang, Imai, Yoshio, Kumar, Krishna S., Maas, Frank, Mammei, Juliette, Pan, Jie, Pandey, Preeti, Paschke, Kent, Perić, Ivan, Pitt, Mark, Rahman, Sakib, Riordan, Seamus, Rodríguez Piñeiro, David, Sfienti, Concettina, Sorokin, Iurii, Souder, Paul, Spiesberger, Hubert, Thiel, Michaela, Tyukin, Valery, and Weitzel, Quirin. Fri . "The P2 experiment: A future high-precision measurement of the weak mixing angle at low momentum transfer". United States. doi:10.1140/epja/i2018-12611-6.
@article{osti_1500103,
title = {The P2 experiment: A future high-precision measurement of the weak mixing angle at low momentum transfer},
author = {Becker, Dominik and Bucoveanu, Razvan and Grzesik, Carsten and Imai, Kathrin and Kempf, Ruth and Molitor, Matthias and Tyukin, Alexey and Zimmermann, Marco and Armstrong, David and Aulenbacher, Kurt and Baunack, Sebastian and Beminiwattha, Rakitha and Berger, Niklaus and Bernhard, Peter and Brogna, Andrea and Capozza, Luigi and Covrig Dusa, Silviu and Deconinck, Wouter and Diefenbach, Jürgen and Dunne, James and Erler, Jens and Gal, Ciprian and Gericke, Michael and Gläser, Boris and Gorchtein, Mikhail and Gou, Boxing and Gradl, Wolfgang and Imai, Yoshio and Kumar, Krishna S. and Maas, Frank and Mammei, Juliette and Pan, Jie and Pandey, Preeti and Paschke, Kent and Perić, Ivan and Pitt, Mark and Rahman, Sakib and Riordan, Seamus and Rodríguez Piñeiro, David and Sfienti, Concettina and Sorokin, Iurii and Souder, Paul and Spiesberger, Hubert and Thiel, Michaela and Tyukin, Valery and Weitzel, Quirin},
abstractNote = {Here we describe the research and development work for the P2 experiment which aims for a high precision determination of the weak mixing angle sin2θW to a precision of 0.15% at a four-momentum transfer of 4.5×10–3 GeV2. This accuracy, comparable to existing measurements at the Z pole, allows for a sensitive test of the Standard Model up to a mass scale of 50 TeV, extendable to 60 TeV. The weak mixing angle is connected to the weak charge of the proton which will be extracted from a measurement of the parity violating cross section asymmetry –39.94×10–9 in elastic electron-proton scattering. A total accuracy of 0.57×10–9 is achievable in a measurement time of 11000 h using a 150μA polarized electron beam impinging on a 60 cm liquid hydrogen target. The P2 asymmetry is smaller than any asymmetry measured so far in electron scattering with an unprecedented goal for the accuracy. The use of a solenoid spectrometer with 100% Φ-acceptance as well as an atomic hydrogen trap polarimeter are new features, which have never before been used in parity-violation experiments. In order to collect the enormous statistics required for this measurement, the new Mainz Energy-Recovering Superconducting Accelerator (MESA) is under construction. Plans for the associated beam control system and the polarimetry are described in this article as well. A liquid hydrogen high-power target with an extremely low noise level of 10 ppm needs to be designed and constructed. We report in addition on the conceptual design of the P2 spectrometer, its Cherenkov detectors, the integrating read-out electronics as well as the ultra-thin, fast tracking detectors. The physics program of the MESA facility comprises indirect, high precision search for physics beyond the Standard Model, measurement of the neutron distribution in nuclear physics, single-spin asymmetries, and a possible future extension to the measurement of hadronic parity violation.},
doi = {10.1140/epja/i2018-12611-6},
journal = {European Physical Journal. A},
issn = {1434-6001},
number = 11,
volume = 54,
place = {United States},
year = {2018},
month = {11}
}

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