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Title: An update on the LHC monojet excess

Abstract

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.

Authors:
 [1];  [1];  [1];  [2];  [1]
+ Show Author Affiliations
  1. Rutgers Univ., Piscataway, NJ (United States). NHETC. Dept. of Physics and Astronomy
  2. Rutgers Univ., Piscataway, NJ (United States). NHETC. Dept. of Physics and Astronomy; Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Rutgers Univ., Piscataway, NJ (United States); Univ. of California, Irvine, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF); Simons Foundation (United States)
OSTI Identifier:
1502354
Grant/Contract Number:  
SC0010008; SC0017811; PHY-1620638; 376204
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 3; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; phenomenological models

Citation Formats

Asadi, Pouya, Buckley, Matthew R., DiFranzo, Anthony, Monteux, Angelo, and Shih, David. An update on the LHC monojet excess. United States: N. p., 2018. Web. doi:10.1007/jhep03(2018)130.
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Asadi, Pouya, Buckley, Matthew R., DiFranzo, Anthony, Monteux, Angelo, & Shih, David. An update on the LHC monojet excess. United States. doi:10.1007/jhep03(2018)130.
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Asadi, Pouya, Buckley, Matthew R., DiFranzo, Anthony, Monteux, Angelo, and Shih, David. Wed . "An update on the LHC monojet excess". United States. doi:10.1007/jhep03(2018)130. https://www.osti.gov/servlets/purl/1502354.
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@article{osti_1502354,
title = {An update on the LHC monojet excess},
author = {Asadi, Pouya and Buckley, Matthew R. and DiFranzo, Anthony and Monteux, Angelo and Shih, David},
abstractNote = {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.},
doi = {10.1007/jhep03(2018)130},
journal = {Journal of High Energy Physics (Online)},
number = 3,
volume = 2018,
place = {United States},
year = {2018},
month = {3}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI:  10.1007/jhep03(2018)130
Copyright Statement
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Figures / Tables:

Figure 1 Figure 1: The “mono-$\phi$” simplified model that fits well the monojet excess in the CMS and ATLAS searches.
All figures and tables (6 total)
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Works referenced in this record:

Digging deeper for new physics in the LHC data
journal, November 2017

  • Asadi, Pouya; Buckley, Matthew R.; DiFranzo, Anthony
  • Journal of High Energy Physics, Vol. 2017, Issue 11
  • DOI: 10.1007/JHEP11(2017)194

Supersymmetric models with low-energy baryon number violation
journal, April 1986

Asymptotic formulae for likelihood-based tests of new physics
journal, February 2011

Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV
journal, August 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

  • Alwall, J.; Frederix, R.; Frixione, S.
  • Journal of High Energy Physics, Vol. 2014, Issue 7
  • DOI: 10.1007/JHEP07(2014)079
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    Table 1 (p. 4)table
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    Figure 5 (p. 8)figure
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