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Exploring the nearly degenerate stop region with sbottom decays

An, Haipeng and Gu, Jiayin and Wang, Lian-Tao (2017) Exploring the nearly degenerate stop region with sbottom decays. Journal of High Energy Physics, 2017 (4). Art. No. 084. ISSN 1126-6708. doi:10.1007/JHEP04(2017)084.

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A light stop with mass almost degenerate with the lightest neutralino has important connections with both naturalness and dark matter relic abundance. This region is also very hard to probe at colliders. In this paper, we demonstrate the potential of searching for such stop particles at the LHC from sbottom decays, focusing on two channels with final states 2ℓ + E^(miss)_T and 1bℓ + E^(miss)_T. We found that, if the lightest sbottom has mass around or below 1TeV and has a significant branching ratio to decay to stop and W (b → tW), a stop almost degenerate with neutralino can be excluded up to about 500-600 GeV at the 13TeV LHC with 300 fb^(-1) data. The searches we propose are complementary to other SUSY searches at the LHC and could have the best sensitivity to the stop-bino coannihilation region. Since they involve final states which have already been used in LHC searches, a reinterpretation of the search results already has sensitivity. Further optimization could deliver the full potential of these channels.

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Additional Information:© 2017 The Author(s). 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: January 10, 2017; Accepted: March 26, 2017; Published: April 13, 2017. We would like to thank Zhen Liu for useful discussions. HA is supported by the Walter Burke Institute at Caltech and by DOE Grant de-sc0011632. JG is supported by the International Postdoctoral Exchange Fellowship Program between the Office of the National Administrative Committee of Postdoctoral Researchers of China (ONACPR) and DESY. JG would also like to express a special thanks to the Mainz Institute for Theoretical Physics (MITP) for its hospitality and support. LTW is supported by DOE grant DE-SC0013642.
Group:Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Department of Energy (DOE)DE-SC0011632
Office of the National Administrative Committee of Postdoctoral Researchers of ChinaUNSPECIFIED
Deutsches Elektronen-Synchrotron (DESY)UNSPECIFIED
Mainz Institute for Theoretical PhysicsUNSPECIFIED
Department of Energy (DOE)DE-SC0013642
Issue or Number:4
Record Number:CaltechAUTHORS:20170213-082147591
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Official Citation:An, H., Gu, J. & Wang, LT. J. High Energ. Phys. (2017) 2017: 84. doi:10.1007/JHEP04(2017)084
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74226
Deposited By: Ruth Sustaita
Deposited On:13 Feb 2017 17:12
Last Modified:11 Nov 2021 05:25

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