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Title: An update on the LHC monojet excess

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [2];  [3];  [2]
  1. Rutgers Univ., Piscataway, NJ (United States). NHETC. Dept. of Physics and Astronomy; Rutgers Univ., Piscataway, NJ (United States)
  2. Rutgers Univ., Piscataway, NJ (United States). NHETC. Dept. of Physics and Astronomy
  3. Rutgers Univ., Piscataway, NJ (United States). NHETC. Dept. of Physics and Astronomy; Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
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In previous work, we identified an anomalous number of events in the LHC jets+MET searches characterized by low jet multiplicity and low-to-moderate transverse energy variables. Here, we update this analysis with results from a new ATLAS search in the monojet channel which also shows a consistent excess. As before, we find that this “monojet excess” is well-described by the resonant production of a heavy colored state decaying to a quark and a massive invisible particle. In the combined ATLAS and CMS data, we now find a local (global) preference of 3.3σ (2.5σ) for the new physics model over the Standard Model-only hypothesis. As the signal regions containing the excess are systematics-limited, we consider additional cuts to enhance the signal-to-background ratio. We show that binning finer in HT and requiring the jets to be more central can increase S/B by a factor of ~1.5.

Research Organization:
Rutgers Univ., Piscataway, NJ (United States); Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF) (United States); Simons Foundation (United States)
Grant/Contract Number:
SC0010008; SC0017811
OSTI ID:
1502354
Alternate ID(s):
OSTI ID: 22739295
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 3 Vol. 2018; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

References (10)

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Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV collection January 2018
An introduction to PYTHIA 8.2 journal June 2015
Asymptotic formulae for likelihood-based tests of new physics journal February 2011
Digging deeper for new physics in the LHC data journal November 2017
Search for new phenomena with the $$M_{\mathrm {T2}}$$ M T 2 variable in the all-hadronic final state produced in proton–proton collisions at $$\sqrt{s} = 13$$ s = 13 $$\,\text {TeV}$$ TeV journal October 2017
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations journal July 2014
Search for dark matter and other new phenomena in events with an energetic jet and large missing transverse momentum using the ATLAS detector collection January 2018
Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV journal August 2017
Supersymmetric models with low-energy baryon number violation journal April 1986

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