Abstract
In the RHIC forward (RHICf) experiment, an operation with pp collisions was performed at √(s) = 510 GeV from 24–27 June 2017. The performances, energy and position resolutions, trigger efficiency, stability, and background during the operation, have been studied using data and simulations, which revealed that the requirements for production cross-section and transverse single-spin asymmetry measurements of very forward photons, π0s, and neutrons were satisfied. In this paper, we describe the details of these studies.
Highlights
Trigger and data acquisition systemTrigger signals were generated with a logic based on the energy deposition on the scintillator plates, which was implemented on a system with discriminator modules and a field-programmable gate array (FPGA) board
The luminosity in the RHIC forward (RHICf) operation was set to approximately 1031 cm−2s−1, which is an order of magnitude lower than the nominal value of RHIC at pp collisions required to maintain a low collision pileup rate of 0.05 collisions per bunch crossing
During the 3-days operation, 55 M, 7.3 M, and 31 M events were obtained with the shower, π0, and high-EM triggers, respectively
Summary
Trigger signals were generated with a logic based on the energy deposition on the scintillator plates, which was implemented on a system with discriminator modules and a field-programmable gate array (FPGA) board. Shower trigger was implemented for detecting any electromagnetic (EM) and hadronic showers induced by photons and neutrons This trigger was issued in case any of the three successive layers have hits of the discriminator, for which the threshold was set to approximately 45 MeV. The trigger was issued when the fourth layer in either of the calorimeter exhibited an energy deposit greater than 500 MeV In this trigger sample, Type II π0 events were enriched as well, in which a photon pair from a π0 decay hit one calorimeter and possessed a total photon energy > 100 GeV. Type II π0 events were enriched as well, in which a photon pair from a π0 decay hit one calorimeter and possessed a total photon energy > 100 GeV These trigger signals were mixed after pre-scaling down by factors of 8–30 for shower triggers and 1–4 for high-EM triggers. The inefficiency of photons and contamination of hadrons were estimated using a template-fit method of the L90% distribution onto distributions of pure photon and neutron MC samples
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