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• W4290059288 abstract "Hadron mass spectra are expected to be modified in nuclear matter due to a partial restoration of chiral symmetry. We perform the J-PARC E16 experiment to measure the spectral modification of vector mesons in nuclei. We detect electron–positron pairs from decays of ϕ mesons, produced in 30 GeV pA reactions. It is a key for our experiment to separate electrons from huge hadronic backgrounds. To identify electrons, we developed two-stage detectors comprising hadron blind detectors (HBDs) and lead-glass electromagnetic calorimeters (LGs). These detectors were constructed and installed at the J-PARC high-momentum beamline in 2020, and commissioning runs were performed in 2020 and 2021. The HBDs and the LGs were stably operated at a high counting rate generated in 10-MHz pA interaction at targets, and successfully detected electrons. In the preliminary results, the pion rejection powers were found to be 97.6 ± 0.6% and 91.2 ± 0.7% for the HBD and LG, respectively, which are consistent with the design performance, at the operation thresholds. Further evaluation of electron efficiency is ongoing." @default.
• W4290059288 created "2022-08-06" @default.
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• W4290059288 date "2022-10-01" @default.
• W4290059288 modified "2023-10-09" @default.
• W4290059288 title "Commissioning of the electron identification system for Dilepton measurement in pA collisions at J-PARC" @default.
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• W4290059288 doi "https://doi.org/10.1016/j.nima.2022.167335" @default.
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