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Differential measurement of trident production in strong electromagnetic fields

Christian F. Nielsen1, Robert Holtzapple2, Mads M. Lund1, Jeppe H. Surrow1, Allan H. Sørensen1, Marc B. Sørensen1, and Ulrik I. Uggerhøj1 (CERN NA63 Collaboration)

  • 1Department of Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark
  • 2Department of Physics, California Polytechnic State University, San Luis Obispo, California 93407, USA

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Phys. Rev. D 108, 052013 – Published 29 September, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.052013

Abstract

In this paper, we present experimental results and numerical simulations of trident production, e−→e−e+e−, in a strong electromagnetic field. The experiment was conducted at CERN for the purpose of probing the strong-field parameter χ up to 2.4, using a 200 GeV electron beam penetrating a 400  μm thick germanium crystal oriented along the ⟨110⟩ axis. For the current experimental parameters we found that the trident process is primarily a two-step process, and show remarkable agreement between theoretical predictions and experimental data. This paper is an extension of the previously published paper [C. F. Nielsen et al., Phys. Rev. Lett. 130, 071601 (2023)] and features new analysis differential in the energy of the produced positron and electron in the trident process. Even for the more demanding differential analysis, we find good agreement between theoretical predictions and experimental data, while a slight discrepancy is found in the high energy tail of the trident spectrum. This discrepancy could be an indication of the direct process, but further investigation is needed due to the large uncertainties in this part of the spectrum. Finally we present a suggestion for a future experiment, aiming to probe the direct process using thin crystals.

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Precision Measurement of Trident Production in Strong Electromagnetic Fields

Christian F. Nielsen, Robert Holtzapple, Mads M. Lund, Jeppe H. Surrow, Allan H. Sørensen, Marc B. Sørensen, and Ulrik I. Uggerhøj (CERN NA63)
Phys. Rev. Lett. 130, 071601 (2023)

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Phys. Rev. D 108, 052013– Published 29 September, 2023
  • Received 7 July 2023
  • Accepted 1 September 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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