OPTIMASS: A package for the minimization of kinematic mass functions with constraints

Cho, Won Sang; Gainer, James S.; Kim, Doojin; Lim, Sung Hak; Matchev, Konstantin T.; Moortgat, Filip; Pape, Luc; Park, Myeonghun

doi:10.1007/JHEP01(2016)026

Title: OPTIMASS: A package for the minimization of kinematic mass functions with constraints

Journal Article · 07 January 2016 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP01(2016)026 · OSTI ID:1327323

Cho, Won Sang ^[1]; Gainer, James S. ^[2]; Kim, Doojin ^[2]; Lim, Sung Hak ^[3]; Matchev, Konstantin T. ^[2]; Moortgat, Filip ^[4]; Pape, Luc ^[4]; Park, Myeonghun ^[5]

Institute for Basic Science (IBS), Daejeon (Korea)
Univ. of Florida, Gainesville, FL (United States)
Institute for Basic Science (IBS), Daejeon (Korea); Korea Advanced Institute of Science and Technology, Daejeon (Korea)
European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Asia Pacific Center for Theoretical Physics, Pohang (Korea); Postech, Pohang (Korea); The Univ. of Tokyo, Chiba (Japan)

Reconstructed mass variables, such as M₂, M_2C, M*_T, and M_T2 ^W, play an essential role in searches for new physics at hadron colliders. The calculation of these variables generally involves constrained minimization in a large parameter space, which is numerically challenging. We provide a C++ code, Optimass, which interfaces with the Minuit library to perform this constrained minimization using the Augmented Lagrangian Method. The code can be applied to arbitrarily general event topologies, thus allowing the user to significantly extend the existing set of kinematic variables. Here, we describe this code, explain its physics motivation, and demonstrate its use in the analysis of the fully leptonic decay of pair-produced top quarks using M₂ variables.

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Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010296

OSTI ID:: 1327323

Journal Information:: Journal of High Energy Physics (Online), Vol. 2016, Issue 1; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Title: OPTIMASS: A package for the minimization of kinematic mass functions with constraints

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