An update on the LHC monojet excess

Asadi, Pouya; Buckley, Matthew R.; DiFranzo, Anthony; Monteux, Angelo; Shih, David

doi:10.1007/jhep03(2018)130

Title: An update on the LHC monojet excess

Journal Article · Wed Mar 21 00:00:00 EDT 2018 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep03(2018)130· OSTI ID:1502354

Asadi, Pouya ^[1]; Buckley, Matthew R. ^[1]; DiFranzo, Anthony ^[1]; Monteux, Angelo ^[2]; Shih, David ^[1]

Rutgers Univ., Piscataway, NJ (United States). NHETC. Dept. of Physics and Astronomy
Rutgers Univ., Piscataway, NJ (United States). NHETC. Dept. of Physics and Astronomy; Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy

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.

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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); National Science Foundation (NSF); Simons Foundation (United States)

Grant/Contract Number:: SC0010008; SC0017811; PHY-1620638; 376204

OSTI ID:: 1502354

Journal Information:: Journal of High Energy Physics (Online), Vol. 2018, Issue 3; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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