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Title: An update on the LHC monojet excess

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 H T and requiring the jets to be more central can increase S/B by a factor of ~1.5.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1]
  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:
Grant/Contract Number:
SC0010008; SC0017811; PHY-1620638; 376204
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
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)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; phenomenological models
OSTI Identifier:
1502354

Asadi, Pouya, Buckley, Matthew R., DiFranzo, Anthony, Monteux, Angelo, and Shih, David. An update on the LHC monojet excess. United States: N. p., Web. doi:10.1007/jhep03(2018)130.
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.
Asadi, Pouya, Buckley, Matthew R., DiFranzo, Anthony, Monteux, Angelo, and Shih, David. 2018. "An update on the LHC monojet excess". United States. doi:10.1007/jhep03(2018)130. https://www.osti.gov/servlets/purl/1502354.
@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}
}