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Advances in High Energy Physics
Volume 2016, Article ID 1615081, 9 pages
Research Article

Comparison of ​HORACE and ​PHOTOS Algorithms for Multiphoton Emission in the Context of Boson Mass Measurement

1Physics Department, Duke University, Durham, NC 27708, USA
2Scientific Computing Division, Fermi National Accelerator Laboratory, Batavia, IL 60510, USA

Received 21 October 2015; Accepted 24 December 2015

Academic Editor: Smarajit Triambak

Copyright © 2016 Ashutosh V. Kotwal and Bodhitha Jayatilaka. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


boson mass measurement is sensitive to QED radiative corrections due to virtual photon loops and real photon emission. The largest shift in the measured mass, which depends on the transverse momentum spectrum of the charged lepton from the boson decay, is caused by the emission of real photons from the final-state lepton. There are a number of calculations and codes available to model the final-state photon emission. We perform a detailed study, comparing the results from HORACE and PHOTOS implementations of the final-state multiphoton emission in the context of a direct measurement of boson mass at Tevatron. Mass fits are performed using a simulation of the CDF II detector.