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Title: Reach of the high-energy LHC for gluinos and top squarks in SUSY models with light Higgsinos

Abstract

We investigate the top squark (stop) and gluino reach of the proposed 33 TeV energy upgrade of the Large Hadron Collider (LHC33) in the Minimal Supersymmetric Standard Model (MSSM) with light Higgsinos and relatively heavy electroweak gauginos. In our analysis, we assume that stops decay to Higgsinos via t ˜ 1 t Z ˜ 1 , t ˜ 1 t Z ˜ 2 , and t ˜ 1 b W ˜ 1 with branching fractions in the ratio 1 : 1 : 2 (expected if the decay occurs dominantly via the superpotential Yukawa coupling), while gluinos decay via g ˜ t t ˜ 1 or via three-body decays to third-generation quarks plus Higgsinos. These decay patterns are motivated by models of natural supersymmetry where Higgsinos are expected to be close in mass to m Z , but gluinos may be as heavy as 5–6 TeV, and stops may have masses up to ~ 3 TeV . We devise cuts to optimize the signals from stop and gluino pair production at LHC33. We find that experiments at LHC33 should be able to discover stops with > 5 σ significance if m t ˜ 1 < 2.3 (2.8) [3.2] TeV for an integrated luminosity of 0.3 (1) [ 3 ] ab - 1 . The corresponding reach for gluinos extends to 5 (5.5) [6] TeV. These findings imply that experiments at LHC33 should be able to discover at least one of the stop or gluino pair signals even with an integrated luminosity of 0.3 ab - 1 for natural supersymmetry models with no worse than 3% electroweak fine-tuning and quite likely both gluinos and stops for an integrated luminosity of 3 ab - 1 .

Authors:
 [1];  [2];  [3];  [1];  [3]
  1. Univ. of Oklahoma, Norman, OK (United States)
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Univ. of Hawaii, Honolulu, HI (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
OSTI Identifier:
1598616
Alternate Identifier(s):
OSTI ID: 1413371
Grant/Contract Number:  
SC0010504; PHY-1607611
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Baer, Howard, Barger, Vernon, Gainer, James S., Serce, Hasan, and Tata, Xerxes. Reach of the high-energy LHC for gluinos and top squarks in SUSY models with light Higgsinos. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.115008.
Baer, Howard, Barger, Vernon, Gainer, James S., Serce, Hasan, & Tata, Xerxes. Reach of the high-energy LHC for gluinos and top squarks in SUSY models with light Higgsinos. United States. doi:10.1103/PhysRevD.96.115008.
Baer, Howard, Barger, Vernon, Gainer, James S., Serce, Hasan, and Tata, Xerxes. Thu . "Reach of the high-energy LHC for gluinos and top squarks in SUSY models with light Higgsinos". United States. doi:10.1103/PhysRevD.96.115008. https://www.osti.gov/servlets/purl/1598616.
@article{osti_1598616,
title = {Reach of the high-energy LHC for gluinos and top squarks in SUSY models with light Higgsinos},
author = {Baer, Howard and Barger, Vernon and Gainer, James S. and Serce, Hasan and Tata, Xerxes},
abstractNote = {We investigate the top squark (stop) and gluino reach of the proposed 33 TeV energy upgrade of the Large Hadron Collider (LHC33) in the Minimal Supersymmetric Standard Model (MSSM) with light Higgsinos and relatively heavy electroweak gauginos. In our analysis, we assume that stops decay to Higgsinos via t˜1→tZ˜1, t˜1→tZ˜2, and t˜1→bW˜1 with branching fractions in the ratio 1:1:2 (expected if the decay occurs dominantly via the superpotential Yukawa coupling), while gluinos decay via g˜→tt˜1 or via three-body decays to third-generation quarks plus Higgsinos. These decay patterns are motivated by models of natural supersymmetry where Higgsinos are expected to be close in mass to mZ, but gluinos may be as heavy as 5–6 TeV, and stops may have masses up to ~3TeV. We devise cuts to optimize the signals from stop and gluino pair production at LHC33. We find that experiments at LHC33 should be able to discover stops with >5σ significance if mt˜1<2.3 (2.8) [3.2] TeV for an integrated luminosity of 0.3 (1) [3]ab-1. The corresponding reach for gluinos extends to 5 (5.5) [6] TeV. These findings imply that experiments at LHC33 should be able to discover at least one of the stop or gluino pair signals even with an integrated luminosity of 0.3ab-1 for natural supersymmetry models with no worse than 3% electroweak fine-tuning and quite likely both gluinos and stops for an integrated luminosity of 3ab-1.},
doi = {10.1103/PhysRevD.96.115008},
journal = {Physical Review D},
number = 11,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

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    Works referencing / citing this record:

    HE-LHC : The High-Energy Large Hadron Collider
    text, January 2019