Monojet signatures from heavy colored particles: future collider sensitivities and theoretical uncertainties
Abstract
In models with colored particle Q that can decay into a dark matter candidate X, the relevant collider process pp→$$Q\bar{Q}$$→$$X\bar{X}$$+ jets gives rise to events with significant transverse momentum imbalance. When the masses of Q and X are very close, the relevant signature becomes monojet-like, and Large Hadron Collider (LHC) search limits become much less constraining. In this paper, we study the current and anticipated experimental sensitivity to such particles at the High-Luminosity LHC at s√=14 TeV with L=3 ab-1 of data and the proposed High-Energy LHC at s√=27 TeV with L=15 ab-1 of data. We estimate the reach for various Lorentz and QCD color representations of Q. Identifying the nature of Q is very important to understanding the physics behind the monojet signature. Therefore, we also study the dependence of the observables built from the pp→$$Q\bar{Q}$$ + j process on Q itself. Here, using the state-of-the-art Monte Carlo suites MadGraph5_aMC@NLO+Pythia8 and Sherpa, we find that when these observables are calculated at NLO in QCD with parton shower matching and multijet merging, the residual theoretical uncertainties are comparable to differences observed when varying the quantum numbers of Q itself. We find, however, that the precision achievable with NNLO calculations, where available, can resolve this dilemma.
- Authors:
-
- National Lab. for High Energy Physics (KEK), Tsukuba (Japan). Theory Center
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- National Lab. for High Energy Physics (KEK), Tsukuba (Japan). Theory Center; Graduate Univ. of Advanced Studies (Sokendai) Tsukuba (Japan)
- Durham Univ. (United Kingdom). Dept. of Physics, Inst. for Particle Physics Phenomenology (IPPP)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1475542
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- European Physical Journal. C, Particles and Fields
- Additional Journal Information:
- Journal Volume: 78; Journal Issue: 8; Journal ID: ISSN 1434-6044
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Chakraborty, Amit, Kuttimalai, Silvan, Lim, Sung Hak, Nojiri, Mihoko M., and Ruiz, Richard. Monojet signatures from heavy colored particles: future collider sensitivities and theoretical uncertainties. United States: N. p., 2018.
Web. doi:10.1140/epjc/s10052-018-6149-6.
Chakraborty, Amit, Kuttimalai, Silvan, Lim, Sung Hak, Nojiri, Mihoko M., & Ruiz, Richard. Monojet signatures from heavy colored particles: future collider sensitivities and theoretical uncertainties. United States. https://doi.org/10.1140/epjc/s10052-018-6149-6
Chakraborty, Amit, Kuttimalai, Silvan, Lim, Sung Hak, Nojiri, Mihoko M., and Ruiz, Richard. Sat .
"Monojet signatures from heavy colored particles: future collider sensitivities and theoretical uncertainties". United States. https://doi.org/10.1140/epjc/s10052-018-6149-6. https://www.osti.gov/servlets/purl/1475542.
@article{osti_1475542,
title = {Monojet signatures from heavy colored particles: future collider sensitivities and theoretical uncertainties},
author = {Chakraborty, Amit and Kuttimalai, Silvan and Lim, Sung Hak and Nojiri, Mihoko M. and Ruiz, Richard},
abstractNote = {In models with colored particle Q that can decay into a dark matter candidate X, the relevant collider process pp→$Q\bar{Q}$→$X\bar{X}$+ jets gives rise to events with significant transverse momentum imbalance. When the masses of Q and X are very close, the relevant signature becomes monojet-like, and Large Hadron Collider (LHC) search limits become much less constraining. In this paper, we study the current and anticipated experimental sensitivity to such particles at the High-Luminosity LHC at s√=14 TeV with L=3 ab-1 of data and the proposed High-Energy LHC at s√=27 TeV with L=15 ab-1 of data. We estimate the reach for various Lorentz and QCD color representations of Q. Identifying the nature of Q is very important to understanding the physics behind the monojet signature. Therefore, we also study the dependence of the observables built from the pp→$Q\bar{Q}$ + j process on Q itself. Here, using the state-of-the-art Monte Carlo suites MadGraph5_aMC@NLO+Pythia8 and Sherpa, we find that when these observables are calculated at NLO in QCD with parton shower matching and multijet merging, the residual theoretical uncertainties are comparable to differences observed when varying the quantum numbers of Q itself. We find, however, that the precision achievable with NNLO calculations, where available, can resolve this dilemma.},
doi = {10.1140/epjc/s10052-018-6149-6},
journal = {European Physical Journal. C, Particles and Fields},
number = 8,
volume = 78,
place = {United States},
year = {Sat Aug 25 00:00:00 EDT 2018},
month = {Sat Aug 25 00:00:00 EDT 2018}
}
Web of Science
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