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Title: Monojet plus soft dilepton signal from light higgsino pair production at LHC14

Journal Article · · Physical Review. D, Particles, Fields, Gravitation and Cosmology
 [1];  [2];  [2]
  1. Univ. of Minnesota, Minneapolis, MN (United States); Univ. of Oklahoma, Norman, OK (United States)
  2. Univ. of Hawaii, Honolulu, HI (United States)

Naturalness arguments imply the existence of higgsinos lighter than 200-300 GeV. However, because these higgsinos are nearly mass degenerate, they release very little visible energy in their decays, and (even putting aside triggering issues) signals from electroweak higgsino pair production typically remain buried under Standard Model backgrounds. Prospects for detecting higgsino pair production via events with monojets or mono-photons from initial state radiation are also bleak because of signal-to-background rates typically at the 1% level. Here, we consider the possibility of reducing backgrounds by requiring the presence of soft daughter leptons from higgsino decays in monojet events. We find that LHC14 experiments with an integrated luminosity of 300 fb-1 should be sensitive to light higgsinos at the 5σlevel for μ< 170 GeV with a S/B ~ 8.5%. For an integrated luminosity of 1000 fb-1 (which should be possible at a high luminosity LHC) the corresponding sensitivity to μextends to over 200 GeV though the systematic uncertainty would have to be controlled to considerably better than 5%. The corresponding reach from measurements of the rate asymmetry between monojet events with same flavour vs. opposite flavour dileptons is ~10-15 GeV smaller, but does not suffer the systematic uncertainty from the normalization of the background.

Research Organization:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0010504
OSTI ID:
1598678
Alternate ID(s):
OSTI ID: 1180859
Journal Information:
Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 90, Issue 11; ISSN 1550-7998
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 92 works
Citation information provided by
Web of Science

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Gluino reach and mass extraction at the LHC in radiatively-driven natural SUSY journal July 2017
Exploring New Models in All Detail with SARAH journal January 2015
Neutrino mass from Higgs quadruplet and multicharged Higgs searches at the LHC journal June 2018
Probing bino-wino coannihilation dark matter below the neutrino floor at the LHC journal July 2018
Is the magnitude of the Peccei–Quinn scale set by the landscape? journal November 2019
Illuminating new electroweak states at hadron colliders journal July 2016
Compressing the inert doublet model journal February 2016
Searches for electroweak production of supersymmetric particles with compressed mass spectra in s = 13 TeV p p collisions with the ATLAS detector journal March 2020
The ILC as a natural SUSY discovery machine and precision microscope: from light higgsinos to tests of unification text January 2019
Prospects for Higgs coupling measurements in SUSY with radiatively-driven naturalness text January 2015
Multi-channel assault on natural supersymmetry at the high luminosity LHC text January 2016
Illuminating New Electroweak States at Hadron Colliders text January 2016
Aspects of the same-sign diboson signature from wino pair production with light higgsinos at the high luminosity LHC text January 2017
Probing bino-wino coannihilation dark matter under the neutrino floor at the LHC text January 2018
LHC luminosity and energy upgrades confront natural supersymmetry models text January 2018
The ILC as a natural SUSY discovery machine and precision microscope: from light higgsinos to tests of unification text January 2019