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Project proposal

DIRC detector for PID at an EIC

Background simulation

We are currently running simulations on GEMC, a JLab framework based on GEANT4, to analyze the pion production in the EIC detector. It is an important analysis for the design of the detector in the sense of background particles.

The first analysis is being performed using GEMC with static target and an electron beam with equivalent energy to simulate the some energies of the collider. As a "detector", we created a sphere around the target that saves all the particles that hit it.

The parameters of the simulation are:

• Mono-energetic and pontual (not spread in transverse direction) electron beam.
• Target of liquid hydrogen with thickness of 6 cm (cylinder with radius of 1 mm)
• Detector 90 cm apart of the center of the target (particles decay may occur)

Results of the simulation

All the physics quantities are in the lab frame, where the proton is a fixed target.

Background simulation for EIC

Energy	All electrons	Electrons in theta = \[9.9, 10.1\]	Produced pions (pi+ and pi-)	Produced muons (mu+ and mu-)
s = 11 GeV (e @ 60 GeV p @ 0 GeV)	text.	text.	text.	text.
s = 30 GeV (e @ 480 GeV p @ 0 GeV)	text.	text.	text.	text.

Background simulation for EIC

Energy	Positrons produced	e- and (pi+ + pi-) comparison Cutting momentum	(e- + proton) CM frame Cutting momentum	Q2 Analysis for cutting
s = 11 GeV (e @ 60 GeV p @ 0 GeV)	text.	text.	text.	text.
s = 30 GeV (e @ 480 GeV p @ 0 GeV)	text.	text.

Background simulation for EIC

Energy	e- cut in momentum	e- cut in momentum and angle CM frame cut 1deg < theta < 2deg (lab)	e- cut in momentum - Q2 plot
s = 11 GeV (e @ 60 GeV p @ 0 GeV)	text.	text.	text.
s = 30 GeV (e @ 480 GeV p @ 0 GeV)

Questions being studies now

• What are the physical processes included in GEMC?