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Cornering electroweakinos at the LHC

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Abstract

Squeezed supersymmetric spectra are challenging for the LHC searches based on a sizable missing energy and hard visible particles. One such scenario consists of chargino/second-lightest neutralino NLSPs and a lightest neutralino LSP with a relatively small mass gap (m(χNLSP) − m(χLSP) ≡ Δ ~ (10–50) GeV). In this note, we explore search strategies to better probe this parameter space. We focus on the 3ℓ + \( E_T^{\mathrm{miss}} \) channel arising from the chargino/second-lightest neutralino associated production, and we investigate the role of a relatively hard initial state radiation (ISR) jet. In addition to typical kinematic variables, such as the minimum lepton pair invariant mass, we propose an angular separation variable and two ratio variables which capitalize on the main kinematic features; leptons stay relatively soft under the boost from ISR and a sizable missing energy arises only in tight correlation with the ISR boost. With 300/fb of data at the 14 TeV LHC, we expect to probe electroweakinos up to 320 (700) GeV with Δ ~ 30 GeV and up to 220 (620) GeV with Δ ~ 20 GeV if gauginos decay via gauge bosons (light sleptons). We emphasize that the 3ℓ channel is technically challenging for mass gaps below ~ 12 GeV.

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Authors and Affiliations

  1. Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, IL, 60637, U.S.A.

    Stefania Gori, Sunghoon Jung & Lian-Tao Wang

  2. HEP Division, Argonne National Laboratory, 9700 Cass Ave., Argonne, IL, 60439, U.S.A.

    Stefania Gori

  3. School of Physics, Korea Institute for Advanced Study, Seoul, 130-722, Korea

    Sunghoon Jung

  4. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL, 60637, U.S.A.

    Lian-Tao Wang

Authors
  1. Stefania Gori
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  2. Sunghoon Jung
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  3. Lian-Tao Wang
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Correspondence to Sunghoon Jung.

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ArXiv ePrint: 1307.5952

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Gori, S., Jung, S. & Wang, LT. Cornering electroweakinos at the LHC. J. High Energ. Phys. 2013, 191 (2013). https://doi.org/10.1007/JHEP10(2013)191

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  • DOI: https://doi.org/10.1007/JHEP10(2013)191

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