Jet substructure from dark sector showers
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Springer
Received: June 6, Revised: August 3, Accepted: August 14, Published: September 17,
2020 2020 2020 2020
Jet substructure from dark sector showers
a
Institute for Fundamental Science, Department of Physics, University of Oregon, Eugene, OR 97403, U.S.A. b NHETC, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, U.S.A.
E-mail: [email protected], [email protected], [email protected] Abstract: We examine the robustness of collider phenomenology predictions for a dark sector scenario with QCD-like properties. Pair production of dark quarks at the LHC can result in a wide variety of signatures, depending on the details of the new physics model. A particularly challenging signal results when prompt production induces a parton shower that yields a high multiplicity of collimated dark hadrons with subsequent decays to Standard Model hadrons. The final states contain jets whose substructure encodes their non-QCD origin. This is a relatively subtle signature of strongly coupled beyond the Standard Model dynamics, and thus it is crucial that analyses incorporate systematic errors to account for the approximations that are being made when modeling the signal. We estimate theoretical uncertainties for a canonical substructure observable designed to be sensitive to the gauge (β) structure of the underlying object, the two-point energy correlator e2 , by computing envelopes between resummed analytic distributions and numerical results from Pythia. We explore the separability against the QCD background as the confinement scale, number of colors, number of flavors, and dark quark masses are varied. Additionally, we investigate the uncertainties inherent to modeling dark sector hadronization. Simple estimates are provided that quantify one’s ability to distinguish these dark sector jets from the overwhelming QCD background. Such a search would benefit from theory advances to improve the predictions, and the increase in statistics using the data to be collected at the high luminosity LHC. Keywords: Beyond Standard Model, Resummation ArXiv ePrint: 2004.00631
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP09(2020)118
JHEP09(2020)118
Timothy Cohen,a Joel Dossa and Marat Freytsisb
Contents 1 Introduction
1 4 5 7 9 11
3 Distinguishing dark substructure from QCD e dependence 3.1 Λ eC dependence 3.2 N 3.3 n eF dependence 3.4 m e q dependence
12 12 14 16 18
4 Quantifying hadronization uncertainties
20
5 Discovering dark substructure
21
6 Conclusions
24
A Analytic calculation
26
1
Introduction
The physics program at the Large Hadron Collider (LHC) has reached a very mature stage. Run II is now completed, and ATLAS and CMS each have ∼ 150 fb−1 of 13 TeV data to explore. This data has already taught us a variety of lessons regarding the Standard Model and beyond, but detection of new physics has thus far remained elusive. Given the strong theory motivations provided by, e.g. supersymmetry and/or WIMP dark matter, most signal regions have
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