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Bartender - accidental pileup in signal region

Bartender - accidental pileup in signal region. Introduced rotation of Michel positrons for efficient simulation of accidental pileup It performs the simulation in 1.6 sec/event. 100,000 accidental backups were generated. Procedure

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Bartender - accidental pileup in signal region

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  1. Bartender - accidental pileup in signal region • Introduced rotation of Michel positrons for efficient simulation of accidental pileup • It performs the simulation in 1.6 sec/event. 100,000 accidental backups were generated. • Procedure • Distribute RD events and Michel positrons randomly according to specified event rate in 2.5 micro sec. • If total energy deposit in the calorimeter is smaller than a threshold, it repeats the first step until total energy deposit becomes larger than the threshold. • Search the most energetic gamma ray. From time of the gamma ray, it searches a positron whose kinematics meets the trigger condition. • Rotate all Michel decay sub-events in 2.5 micro sec time region so that the selected Michel positron comes around the most energetic gamma ray. The time differences between the gamma and the Michel positron are distributed randomly within specified time window.

  2. Bartender - prompt background in signal region • Around 5000 prompt background events were generated. • ‘RD with a high energy gamma and a high energy positron’ + ‘Michel pileups’ + ‘RD pileups’. • 1.2 sec/events for bartender. • In this production, trigger efficiency was too low. I will investigate the reason. • gem, X > 0.9, Y > 0.25, RD, 10000 events • Less than 500 events were triggered in bartender. • Maybe opening angle did not meet the pre-trigger condition. (> 173 degree) If it is the case, we may need to make a new key for gem to specify opening angle.

  3. Nsum3(total charge corrected with total PMT coverage) C : Normalization factor ( constant ) Ω : Total PMT coverage viewed from reconstructed position N : Number of photons observed by a PMT We could also take into account attenuation and scattering. Detailed study of the result is not done yet. If we increase corrections, several parameters can affect the energy resolution ( position reconstruction, attenuation length estimation, simulation settings...). It is not clear how much we should do correction. Philosophy of this calorimeter is measuring energy without complicated correction. Nsum Nsum2 Nsum3

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