Collider probes of real triplet scalar dark matter
We study discovery prospects for a real triplet extension of the Standard Model scalar sector at the Large Hadron Collider (LHC) and a possible future 100 TeV pp collider. We focus on the scenario in which the neutral triplet scalar is stable and contributes to the dark matter relic density. When produced in pp collisions, the charged triplet scalar decays to the neutral component plus a soft pion or soft lepton pair, yielding a disappearing charged track in the detector. We recast current 13 TeV LHC searches for disappearing tracks, and find that the LHC presently excludes a real triplet scalar lighter than 248 (275) GeV, for a mass splitting of 172 (160) MeV with ℒ = 36 fb⁻¹. The reach can extend to 497 (520) GeV with the collection of 3000 fb⁻¹. We extrapolate the 13 TeV analysis to a prospective 100 TeV pp collider, and find that a ∼ 3 TeV triplet scalar could be discoverable with ℒ = 30 ab⁻¹, depending on the degree to which pile up effects are under control. We also investigate the dark matter candidate in our model and corresponding present and prospective constraints from dark matter direct detection. We find that currently XENON1T can exclude a real triplet dark matter lighter than ∼ 3 TeV for a Higgs portal coupling of order one or larger, and the future XENON20T will cover almost the entire dark matter viable parameter space except for vanishingly small portal coupling.
Additional Information© 2021 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Article funded by SCOAP3. Received: April 9, 2020; Revised: December 4, 2020; Accepted: December 10, 2020; Published: January 28, 2021. The authors thank R. Sawada, J. Zurita, F. Rojas, J.-H. Yu, H. Patel, A. Belyaev, O. Mattelaer and L. Friedrich for helpful discussions. YD also thanks the Institute of Theoretical Physics, Chinese Academy of Science –where a portion of this work was completed — for hospitality and local support. CWC was supported in part by the Ministry of Science and Technology (MOST) of Taiwan under Grant Nos. MOST-104-2628-M-002-014-MY4 and MOST-108-2811-M-002-548. GC acknowledges support from grant No. MOST-107-2811-M-002-3120 and ANID/FONDECYT-Chile grant No. 3190051. YD, KF, and MJRM were supported in part under U.S. Department of Energy contract No. DE-SC0011095. MJRM was also supported in part under National Science Foundation of China grant No. 19Z103010239. KF was also supported by the LANL/LDRD Program.
Accepted Version - 2003.07867.pdf