01. project date 8/19/2011. Conceptual Studies for the π 0 Hadronic Calorimeter. Rob Macedo and Katya Gilbo Catholic University of America. Under the Direction of Dr. Tanja Horn. Paul the Pion. 02. Outline. Intro Goals/Motivations The π 0 Experiment Kinematics and Programming
Conceptual Studies for the π0 Hadronic Calorimeter
Rob Macedo and Katya Gilbo
Catholic University of America
Under the Direction of Dr. Tanja Horn
Paul the Pion
Overall Goal of CUA Nuclear Physics Team:To study the proton's substructure, including the quarks inside a proton and the workings of the strong force.
We want a better understanding of our universe.
The π0 Experiment
Pion decays into two photons. Angle between photons, photon energy and momentum can be measured using a calorimeter – giving us details about the pion.
Pion gains enough energy to become real, and is recoiled
Electron from electron beam emits a virtual photon, and is scattered. The Scattered electron’s angle, momentum and energy can be measured.
Proton is also recoiled
Proton surrounded by virtual pions
Ex. of GPDs
(so that we can identify the undetected proton in our experiment)
A Hadronic Calorimeter
We input in function:
Average: Hypothetical Values (Above)
Standard Deviation (for each): 0.1 GeV
4. The “Missing Mass” is affected by the three inversely distributed quantities.
Gaussian Distribute these “Realistic” Missing Mass Values
Proton mass Mean: 0.938 GeV
Calorimeter STDEV: 0.1 GeV
Proton Missing Mass STDEV: 0.14 GeV
Eta mass mean:0.15 GeV
delta mass mean: 1.2 GeV
Where do we go now?
1. Center of Mass (CM)- coordinate frame with zero net momentum, “frame from particle’s perspective”
2. Laboratory- coordinate frame with stationary proton target, “frame from detector’s perspectives”
Checking Aerogel Index of Refraction
where n is the index, p is density