Hybrid Calorimeter Algorithm Development for Primex Experiment

Journal Article · Tue Jan 01 00:00:00 EST 2002 · Journal of Undergraduate Research

OSTI ID:1051298

Motoyama, E; Gasparian, A; Bernstein, A

The PrimEx Collaboration seeks to measure the lifetime of the 0 meson (neutral pion) at high precision. The decay rate of the pion is considered to be the most fundamental prediction of low-energy quantum chromodynamics (QCD). Pions will be produced by the Primakoff Effect: a few GeV photon interacts with the coulomb field of a nucleus to produce a pion. The pion then decays almost immediately ({approx}10-16 seconds) into two photons. The decay photons will be detected by an electromagnetic hybrid calorimeter (HYCAL), an array of lead tungstate and lead glass crystals. An algorithm is needed to calculate the angular separation of the two decay photons (and thus the invariant mass of the pion) from the energies deposited in HYCAL. A GEANT Monte Carlo simulation of the experiment is used to test and develop the algorithm to achieve the best angular resolution. The development of the algorithm is essential to the PrimEx project.

• Research Organization: DOESC (USDOE Office of Science (SC) (United States))
• Sponsoring Organization: USDOE Office of Science (SC)
• OSTI ID: 1051298
• Journal Information: Journal of Undergraduate Research, Vol. 2
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCURACY
ALGORITHMS
CALORIMETERS
COULOMB FIELD
DECAY
FORECASTING
GLASS
LEAD TUNGSTATES
LIFETIME
MESONS
PHOTONS
PIONS
PRIMAKOFF EFFECT
QUANTUM CHROMODYNAMICS
RESOLUTION
SIMULATION