Cornering Higgsinos Using Soft Displaced Tracks

Open Access

Cornering Higgsinos Using Soft Displaced Tracks

Hajime Fukuda, Natsumi Nagata, Hideyuki Oide, Hidetoshi Otono, and Satoshi Shirai

Phys. Rev. Lett. 124, 101801 – Published 11 March 2020

Abstract

Higgsino has been intensively searched for in the LHC experiments in recent years. Currently, there is an uncharted region beyond the LEP Higgsino mass limit where the mass splitting between the neutral and charged Higgsinos is around 0.3–1 GeV, which is unexplored by either the soft di-lepton or disappearing track searches. This region is, however, of great importance from a phenomenological point of view, as many supersymmetric models predict such a mass spectrum. In this Letter, we propose a possibility of filling this gap by using a soft microdisplaced track in addition to the monojet event selection, which allows us to discriminate a signature of the charged Higgsino decay from the standard model background. It is found that this new strategy is potentially sensitive to a Higgsino mass of $≲ 180 (250) GeV$ at the LHC Run2 (HL-LHC) for a charged-neutral mass splitting of $≃ 0.5 GeV$ .

Received 1 November 2019
Revised 20 January 2020
Accepted 19 February 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.101801

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particle dark matter Supersymmetric models

Hadron colliders

Particles & Fields

Authors & Affiliations

Hajime Fukuda ^1,2, Natsumi Nagata³, Hideyuki Oide ⁴, Hidetoshi Otono ⁵, and Satoshi Shirai⁶

¹Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
²Berkeley Center for Theoretical Physics, Department of Physics, University of California, Berkeley, California 94720, USA
³Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
⁴Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
⁵Research Center for Advanced Particle Physics, Kyushu University, Fukuoka 819-0395, Japan
⁶Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan