Novel Higgsino dark matter signal interpretation at the LHC

Ernesto Arganda (Instituto de Física Teórica UAM/CSIC, C/ Nicolás Cabrera 13-15, Campus de Cantoblanco, 28049 Madrid, Spain; IFLP, CONICET—Dpto. de Física, Universidad Nacional de La Plata, C.C. 67, 1900 La Plata, Argentina) ; Antonio Delgado (Department of Physics, University of Notre Dame, 225 Nieuwland Hall Notre Dame, Indiana 46556, USA) ; Roberto A. Morales (Instituto de Física Teórica UAM/CSIC, C/ Nicolás Cabrera 13-15, Campus de Cantoblanco, 28049 Madrid, Spain) ; Mariano Quirós (Institut de Física d’Altes Energies (IFAE) and BIST, Campus UAB 08193, Bellaterra, Barcelona, Spain)

In the LHC searches for gluinos it is usually assumed that they decay predominantly into the lightest neutralino plus jets. In this work we perform a proof-of-concept collider analysis of a novel supersymmetric signal in which gluinos decay mostly into jets and the bino-like neutralino (χ˜30), which in turn decays into the lightest Higgsino-like neutralino (χ˜10), considered the dark matter candidate, together with the SM-like Higgs boson (h). This new physics signal then consists of an LHC final state made up by four light jets, four b-jets, and a large amount of missing transverse energy. We identify tt¯, V+jets (V=W, Z), and tt¯+X (X=W, Z, γ*, h) productions as the most problematic backgrounds, and develop a search strategy for the high luminosity phase of the LHC, reaching signal significances at the evidence level for a luminosity of 1000 fb1. The prospects for a luminosity of 3000 fb1 are even more promising, with discovery-level significances.

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  "abstracts": [
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      "source": "APS", 
      "value": "In the LHC searches for gluinos it is usually assumed that they decay predominantly into the lightest neutralino plus jets. In this work we perform a proof-of-concept collider analysis of a novel supersymmetric signal in which gluinos decay mostly into jets and the bino-like neutralino (<math><msubsup><mover><mi>\u03c7</mi><mo>\u02dc</mo></mover><mn>3</mn><mn>0</mn></msubsup></math>), which in turn decays into the lightest Higgsino-like neutralino (<math><msubsup><mover><mi>\u03c7</mi><mo>\u02dc</mo></mover><mn>1</mn><mn>0</mn></msubsup></math>), considered the dark matter candidate, together with the SM-like Higgs boson (<math><mi>h</mi></math>). This new physics signal then consists of an LHC final state made up by four light jets, four <math><mi>b</mi></math>-jets, and a large amount of missing transverse energy. We identify <math><mi>t</mi><mover><mi>t</mi><mo>\u00af</mo></mover></math>, <math><mi>V</mi><mo>+</mo><mrow><mtext>jets</mtext></mrow></math> (<math><mi>V</mi><mo>=</mo><mi>W</mi></math>, <math><mi>Z</mi></math>), and <math><mi>t</mi><mover><mi>t</mi><mo>\u00af</mo></mover><mo>+</mo><mi>X</mi></math> (<math><mi>X</mi><mo>=</mo><mi>W</mi></math>, <math><mi>Z</mi></math>, <math><msup><mi>\u03b3</mi><mo>*</mo></msup></math>, <math><mi>h</mi></math>) productions as the most problematic backgrounds, and develop a search strategy for the high luminosity phase of the LHC, reaching signal significances at the evidence level for a luminosity of <math><mrow><mn>1000</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>fb</mi></mrow><mrow><mo>\u2212</mo><mn>1</mn></mrow></msup></mrow></math>. The prospects for a luminosity of <math><mrow><mn>3000</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>fb</mi></mrow><mrow><mo>\u2212</mo><mn>1</mn></mrow></msup></mrow></math> are even more promising, with discovery-level significances."
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Published on:
07 September 2021
Publisher:
APS
Published in:
Physical Review D , Volume 104 (2021)
Issue 5
DOI:
https://doi.org/10.1103/PhysRevD.104.055003
arXiv:
2104.13827
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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