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\@writefile{toc}{\contentsline {section}{\numberline {1}Introduction}{1}{section.1}\protected@file@percent }
\@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces Tag electron hit time distribution relative to the accelerator RF clock for microcope column 90 measured during run 140543 in May, 2026. The enhancement of the three central RF buckets comes from true coincidences with the pair spectrometer located in the bremsstrahlung photon beam downstream of the tagger, which served as the trigger source for the events shown in this plot. The width and shape of the peaks comes almost entirely from the time resolution of the microscope.}}{2}{figure.1}\protected@file@percent }
\newlabel{fig1}{{1}{2}{Tag electron hit time distribution relative to the accelerator RF clock for microcope column 90 measured during run 140543 in May, 2026. The enhancement of the three central RF buckets comes from true coincidences with the pair spectrometer located in the bremsstrahlung photon beam downstream of the tagger, which served as the trigger source for the events shown in this plot. The width and shape of the peaks comes almost entirely from the time resolution of the microscope}{figure.1}{}}
\@writefile{toc}{\contentsline {section}{\numberline {2}Associating peaks with RF beam buckets}{2}{section.2}\protected@file@percent }
\@writefile{lof}{\contentsline {figure}{\numberline {2}{\ignorespaces Tag electron hit time distribution relative to the accelerator RF clock for hodoscope counter 265 measured during run 140543 in May, 2026. The enhancement of the three central RF buckets comes from true coincidences with the pair spectrometer located in the bremsstrahlung photon beam downstream of the tagger, which served as the trigger source for the events shown in this plot. The width of the peaks comes almost entirely from the time resolution of the hodoscope, which is somewhat better than the microscope.}}{3}{figure.2}\protected@file@percent }
\newlabel{fig2}{{2}{3}{Tag electron hit time distribution relative to the accelerator RF clock for hodoscope counter 265 measured during run 140543 in May, 2026. The enhancement of the three central RF buckets comes from true coincidences with the pair spectrometer located in the bremsstrahlung photon beam downstream of the tagger, which served as the trigger source for the events shown in this plot. The width of the peaks comes almost entirely from the time resolution of the hodoscope, which is somewhat better than the microscope}{figure.2}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {3}{\ignorespaces Tag electron hit time distribution relative to the accelerator RF clock for hodoscope counter 258 measured during run 140543 in May, 2026. The enhancement of the three central RF buckets comes from true coincidences with the pair spectrometer located in the bremsstrahlung photon beam downstream of the tagger, which served as the trigger source for the events shown in this plot. The lack of side peaks in the time spectrum for this counter stands in sharp contrast to the hodoscope counters on either side of it.}}{3}{figure.3}\protected@file@percent }
\newlabel{fig3}{{3}{3}{Tag electron hit time distribution relative to the accelerator RF clock for hodoscope counter 258 measured during run 140543 in May, 2026. The enhancement of the three central RF buckets comes from true coincidences with the pair spectrometer located in the bremsstrahlung photon beam downstream of the tagger, which served as the trigger source for the events shown in this plot. The lack of side peaks in the time spectrum for this counter stands in sharp contrast to the hodoscope counters on either side of it}{figure.3}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {4}{\ignorespaces Tag electron hit time distribution relative to the accelerator RF clock for hodoscope counter 200 measured during run 140543 in May, 2026. The enhancement of the three central RF buckets comes from true coincidences with the pair spectrometer located in the bremsstrahlung photon beam downstream of the tagger, which served as the trigger source for the events shown in this plot. The side peaks are visible in this spectrum, but are much smaller than those seen in most counters located closer to the downstream end of the hodoscope.}}{4}{figure.4}\protected@file@percent }
\newlabel{fig4}{{4}{4}{Tag electron hit time distribution relative to the accelerator RF clock for hodoscope counter 200 measured during run 140543 in May, 2026. The enhancement of the three central RF buckets comes from true coincidences with the pair spectrometer located in the bremsstrahlung photon beam downstream of the tagger, which served as the trigger source for the events shown in this plot. The side peaks are visible in this spectrum, but are much smaller than those seen in most counters located closer to the downstream end of the hodoscope}{figure.4}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {5}{\ignorespaces Tag electron hit time distribution relative to the accelerator RF clock versus hodoscope counter number for the full range of the sampling region of the tagger hodoscope during run 140543. The side peaks show up as faint ridges 1\nobreakspace  {}ns below the primary peaks that are regularly spaced every 4\nobreakspace  {}ns.}}{4}{figure.5}\protected@file@percent }
\newlabel{fig5}{{5}{4}{Tag electron hit time distribution relative to the accelerator RF clock versus hodoscope counter number for the full range of the sampling region of the tagger hodoscope during run 140543. The side peaks show up as faint ridges 1~ns below the primary peaks that are regularly spaced every 4~ns}{figure.5}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {6}{\ignorespaces Tag electron hit time distribution relative to the accelerator RF clock versus microscope column number for the downstream end of the tagger microscope during run 140543. The readout of the upstream end of the microscope was not initialized properly during this run, so they are not included in the plot.}}{5}{figure.6}\protected@file@percent }
\newlabel{fig6}{{6}{5}{Tag electron hit time distribution relative to the accelerator RF clock versus microscope column number for the downstream end of the tagger microscope during run 140543. The readout of the upstream end of the microscope was not initialized properly during this run, so they are not included in the plot}{figure.6}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {7}{\ignorespaces Sample correlation between the per-event hit count in each side peak of the time spectrum from tagh counter 265 and the per-event hit count in each main peak of the time spectrum from tagh counter 100, for run 140543. All pair trigger events in this run are included in this sample. Side peak hits are counted between -1.5 and -0.9\nobreakspace  {}ns of the corresponding main peak center. Main peak hits are counted between -0.3 and +0.3\nobreakspace  {}ns of the main peak center.}}{6}{figure.7}\protected@file@percent }
\newlabel{fig7}{{7}{6}{Sample correlation between the per-event hit count in each side peak of the time spectrum from tagh counter 265 and the per-event hit count in each main peak of the time spectrum from tagh counter 100, for run 140543. All pair trigger events in this run are included in this sample. Side peak hits are counted between -1.5 and -0.9~ns of the corresponding main peak center. Main peak hits are counted between -0.3 and +0.3~ns of the main peak center}{figure.7}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {8}{\ignorespaces Sample correlation between the per-event hit count in each side peak of the time spectrum from tagh counter 265 and the per-event hit count in each main peak of the time spectrum from tagh counter 200, for run 140543. All pair trigger events in this run are included in this sample. Side peak hits are counted between -1.5 and -0.9\nobreakspace  {}ns of the corresponding main peak center. Main peak hits are counted between -0.3 and +0.3\nobreakspace  {}ns of the main peak center.}}{7}{figure.8}\protected@file@percent }
\newlabel{fig8}{{8}{7}{Sample correlation between the per-event hit count in each side peak of the time spectrum from tagh counter 265 and the per-event hit count in each main peak of the time spectrum from tagh counter 200, for run 140543. All pair trigger events in this run are included in this sample. Side peak hits are counted between -1.5 and -0.9~ns of the corresponding main peak center. Main peak hits are counted between -0.3 and +0.3~ns of the main peak center}{figure.8}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {9}{\ignorespaces Sample correlation between the per-event hit count in each main peak of the time spectrum from tagh counter 265 and the per-event hit count in each main peak of the time spectrum from tagh counter 100, for run 140543. All pair trigger events in this run are included in this sample. Side peak hits are counted between -1.5 and -0.9\nobreakspace  {}ns of the corresponding main peak center. Main peak hits are counted between -0.3 and +0.3\nobreakspace  {}ns of the main peak center.}}{7}{figure.9}\protected@file@percent }
\newlabel{fig9}{{9}{7}{Sample correlation between the per-event hit count in each main peak of the time spectrum from tagh counter 265 and the per-event hit count in each main peak of the time spectrum from tagh counter 100, for run 140543. All pair trigger events in this run are included in this sample. Side peak hits are counted between -1.5 and -0.9~ns of the corresponding main peak center. Main peak hits are counted between -0.3 and +0.3~ns of the main peak center}{figure.9}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {10}{\ignorespaces Sample correlation between the per-event hit count in each main peak of the time spectrum from tagh counter 265 and the per-event hit count in each main peak of the time spectrum from tagh counter 200, for run 140543. All pair trigger events in this run are included in this sample. Side peak hits are counted between -1.5 and -0.9\nobreakspace  {}ns of the corresponding main peak center. Main peak hits are counted between -0.3 and +0.3\nobreakspace  {}ns of the main peak center.}}{8}{figure.10}\protected@file@percent }
\newlabel{fig10}{{10}{8}{Sample correlation between the per-event hit count in each main peak of the time spectrum from tagh counter 265 and the per-event hit count in each main peak of the time spectrum from tagh counter 200, for run 140543. All pair trigger events in this run are included in this sample. Side peak hits are counted between -1.5 and -0.9~ns of the corresponding main peak center. Main peak hits are counted between -0.3 and +0.3~ns of the main peak center}{figure.10}{}}
\@writefile{toc}{\contentsline {section}{\numberline {3}Considering M\"{o}llers as a source}{8}{section.3}\protected@file@percent }
\@writefile{toc}{\contentsline {section}{\numberline {4}One remaining hypothesis}{8}{section.4}\protected@file@percent }
\@writefile{lof}{\contentsline {figure}{\numberline {11}{\ignorespaces Horizontal slice through the Hall D tagger at the beam elevation, with the radiator crystal in its vacuum chamber at the left side of the figure, and the electron beam exiting the tagger toward the beam dump toward the lower right. The red curve is the track of a post-bremsstrahlung electron that radiates a photon at the radiator and gets bent in the spectrometer into the focal plane of the tagger. The figure was produced by the Geant simulation of the Hall D tagger and beamline.}}{9}{figure.11}\protected@file@percent }
\newlabel{fig11}{{11}{9}{Horizontal slice through the Hall D tagger at the beam elevation, with the radiator crystal in its vacuum chamber at the left side of the figure, and the electron beam exiting the tagger toward the beam dump toward the lower right. The red curve is the track of a post-bremsstrahlung electron that radiates a photon at the radiator and gets bent in the spectrometer into the focal plane of the tagger. The figure was produced by the Geant simulation of the Hall D tagger and beamline}{figure.11}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {12}{\ignorespaces M\"{o}ller kinematics for a 3.8\nobreakspace  {}GeV electron beam, showing the total energy of one of the final-state electrons as a function of lab polar angle.}}{9}{figure.12}\protected@file@percent }
\newlabel{fig12}{{12}{9}{M\"{o}ller kinematics for a 3.8~GeV electron beam, showing the total energy of one of the final-state electrons as a function of lab polar angle}{figure.12}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {13}{\ignorespaces Time-of-flight difference between an ordinary post-bremsstrahlung electron that radiates a photon in the radiator, and gets steered in the tagger dipole field into a tagging counter, with a M\"{o}ller electron that travels along a straight-line path from the radiator to the same tagging counter. The small spread in these values takes into account the beam emittance, angular spread in the bremsstrahlung emission and multiple scattering in the radiator.}}{10}{figure.13}\protected@file@percent }
\newlabel{fig13}{{13}{10}{Time-of-flight difference between an ordinary post-bremsstrahlung electron that radiates a photon in the radiator, and gets steered in the tagger dipole field into a tagging counter, with a M\"{o}ller electron that travels along a straight-line path from the radiator to the same tagging counter. The small spread in these values takes into account the beam emittance, angular spread in the bremsstrahlung emission and multiple scattering in the radiator}{figure.13}{}}
\@writefile{toc}{\contentsline {subsection}{\numberline {4.1}pulse height comparison}{10}{subsection.4.1}\protected@file@percent }
\@writefile{lof}{\contentsline {figure}{\numberline {14}{\ignorespaces Pulse height distributions for hits in tagh counter 265 based on GlueX data collected in run 140543 in May, 2026. The open histograms show the raw distributions for hits in the main peaks (red) and the side peaks (blue). The solid red histogram results when accidental coincidences with the pair spectrometer are subtracted. Accidentals subtraction in the case of the side peaks does not change the shape of the distribution.}}{11}{figure.14}\protected@file@percent }
\newlabel{fig14}{{14}{11}{Pulse height distributions for hits in tagh counter 265 based on GlueX data collected in run 140543 in May, 2026. The open histograms show the raw distributions for hits in the main peaks (red) and the side peaks (blue). The solid red histogram results when accidental coincidences with the pair spectrometer are subtracted. Accidentals subtraction in the case of the side peaks does not change the shape of the distribution}{figure.14}{}}
\@writefile{toc}{\contentsline {subsection}{\numberline {4.2}pulse shape comparison}{11}{subsection.4.2}\protected@file@percent }
\@writefile{lof}{\contentsline {figure}{\numberline {15}{\ignorespaces Raw signal waveform of pulses in the main peaks for tagh counter 265, reconstructed from the raw adc waveforms recorded by the data acquisition during run 140543. The parameters are the results of a gaussian fit to the restricted region around the peak maximum.}}{12}{figure.15}\protected@file@percent }
\newlabel{fig15}{{15}{12}{Raw signal waveform of pulses in the main peaks for tagh counter 265, reconstructed from the raw adc waveforms recorded by the data acquisition during run 140543. The parameters are the results of a gaussian fit to the restricted region around the peak maximum}{figure.15}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {16}{\ignorespaces Raw signal waveform of pulses in the side peaks for tagh counter 265, reconstructed from the raw adc waveforms recorded by the data acquisition during run 140543. The parameters are the results of a gaussian fit to the restricted region around the peak maximum.}}{12}{figure.16}\protected@file@percent }
\newlabel{fig16}{{16}{12}{Raw signal waveform of pulses in the side peaks for tagh counter 265, reconstructed from the raw adc waveforms recorded by the data acquisition during run 140543. The parameters are the results of a gaussian fit to the restricted region around the peak maximum}{figure.16}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {17}{\ignorespaces Raw signal waveform of pulses in tagger microscope column 102, reconstructed from the raw adc waveforms recorded by the data acquisition during run 140543. Pulses from the silicon photomultipliers in the tagm readout are somewhat slower than the photomultiplier tube pulses from the tagh counter readout.}}{13}{figure.17}\protected@file@percent }
\newlabel{fig17}{{17}{13}{Raw signal waveform of pulses in tagger microscope column 102, reconstructed from the raw adc waveforms recorded by the data acquisition during run 140543. Pulses from the silicon photomultipliers in the tagm readout are somewhat slower than the photomultiplier tube pulses from the tagh counter readout}{figure.17}{}}
\@writefile{lof}{\contentsline {figure}{\numberline {18}{\ignorespaces Raw signal waveform of pulses from one of the fine-structure array counters in the pair spectrometer. The width of these pulses arises from the silicon photomultiplier readout of the pair spectrometer fine counters.}}{13}{figure.18}\protected@file@percent }
\newlabel{fig18}{{18}{13}{Raw signal waveform of pulses from one of the fine-structure array counters in the pair spectrometer. The width of these pulses arises from the silicon photomultiplier readout of the pair spectrometer fine counters}{figure.18}{}}
\bibcite{sample_journal}{1}
\bibcite{ccdb_doc}{2}
\bibcite{jana2_framework}{3}
\@writefile{lof}{\contentsline {figure}{\numberline {19}{\ignorespaces Raw signal waveform for hits from one of the coarse-structure array counters in the pair spectrometer. The coarse counters in the pair spectrometer are read out with photomultiplier tubes for optimum time resolution.}}{14}{figure.19}\protected@file@percent }
\newlabel{fig19}{{19}{14}{Raw signal waveform for hits from one of the coarse-structure array counters in the pair spectrometer. The coarse counters in the pair spectrometer are read out with photomultiplier tubes for optimum time resolution}{figure.19}{}}
\@writefile{toc}{\contentsline {subsection}{\numberline {4.3}tagger energy resolution comparison}{14}{subsection.4.3}\protected@file@percent }
\@writefile{toc}{\contentsline {subsection}{\numberline {4.4}Data Tables}{14}{subsection.4.4}\protected@file@percent }
\@writefile{lot}{\contentsline {table}{\numberline {1}{\ignorespaces Summary of experimental runs and key measured values.}}{14}{table.1}\protected@file@percent }
\newlabel{tab:run_parameters}{{1}{14}{Summary of experimental runs and key measured values}{table.1}{}}
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