2012/03/12 by Brian van Doren, G. Wilson, van Doren, Brian +2
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Instrumentation and Detectors (physics.ins-det) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1203.2577
LCWS11 Conference Proceedings, 15 pages, 8 figures
arxiv created 2012/03/12 · openalex publication_date 2012/03/12 · arxiv updated 2012/03/13 · openalex created_date 2022/10/02 · openalex updated_date 2026/07/28
We investigate improving the hadronic jet energy resolution using mass-constrained fits of pi0 decays using high granularity electromagnetic calorimeters. Single pi0 studies have indicated a large potential for improvement in the energy resolution of pi0's, typically reducing the average energy resolution by a factor of two for 4 GeV pi0's. We apply this method to fully simulated multi-hadronic events with multiple pi0's with widely varying energies using the ILD00 detector model. Several methods for identifying the correct pairings of photons with parent pi0's were explored. The combinatorics become challenging as the number of pi0's increases and we employ the Blossom V implementation of Edmonds' matching algorithm for handling this. For events where both photons of the pi0 are detected, the resulting solutions lead to an improvement in the pi0 component of the event energy resolution for 91.2 GeV Z0 events from 18.0%/sqrt(E) to 13.9%/sqrt(E) using the ILD00 detector and its reconstruction algorithms. This can be compared to a maximum potential improvement to 12.2%/sqrt(E) if all photon pairs are matched correctly using the current photon reconstruction.