Testing invisible momentum ansatze in missing energy events at the LHC

Kim, Doojin; Matchev, Konstantin T.; Moortgat, Filip; Pape, Luc

doi:10.1007/JHEP08(2017)102

Testing invisible momentum ansatze in missing energy events at the LHC

Journal Article · Wed Aug 23 00:00:00 EDT 2017 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP08(2017)102· OSTI ID:1424608

Kim, Doojin ^[1]; Matchev, Konstantin T. ^[2]; Moortgat, Filip ^[3]; Pape, Luc ^[3]

European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theory Division; University of Florida
Univ. of Florida, Gainesville, FL (United States). Physics Dept.
European Organization for Nuclear Research (CERN), Geneva (Switzerland)

We consider SUSY-like events with two decay chains, each terminating in an invisible particle, whose true energy and momentum are not measured in the detector. Nevertheless, a useful educated guess about the invisible momenta can still be obtained by optimizing a suitable invariant mass function. We review and contrast several proposals in the literature for such ansatze: four versions of the M _{T 2}-assisted on-shell reconstruction (MAOS), as well as several variants of the on-shell constrained M ₂ variables. We compare the performance of these methods with regards to the mass determination of a new particle resonance along the decay chain from the peak of the reconstructed invariant mass distribution. For concreteness, we consider the event topology of dilepton tt¯ events and study each of the three possible subsystems, in both a tt¯ and a SUSY example. We find that the M ₂ variables generally provide sharper peaks and therefore better ansatze for the invisible momenta. We show that the performance can be further improved by preselecting events near the kinematic endpoint of the corresponding variable from which the momentum ansatz originates.

View Accepted Manuscript (DOE)

Research Organization:: European Organization for Nuclear Research (CERN), Geneva (Switzerland); Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: SC0010296

OSTI ID:: 1424608

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2017; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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