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Title: Probing squeezed bino-slepton spectra with the Large Hadron Collider

Abstract

In this study, we consider a minimal supersymmetric Standard Model scenario in which the only light superparticles are a binolike dark matter candidate and a nearly degenerate slepton. It is notoriously difficult to probe this scenario at the Large Hadron Collider (LHC), because the slepton pair-production process yields a final state with soft leptons and small missing transverse energy. We study this scenario in the region of parameter space where the mass difference between the lightest neutralino and the lightest slepton ( Δ m ) is 60 GeV , focusing on the process in which an additional radiated jet provides a transverse boost to the slepton pair. We then utilize the angular separation of the leptons from each other and from the missing transverse energy, as well as the angular separation between the jet and the missing transverse energy, to distinguish signal from background events. We also use the reconstructed ditau mass, the cos θ 1 2 * variable, and for larger Δ m , a lower bound on the lepton p T . These cuts can dramatically improve both signal sensitivity and the signal-to-background ratio, permitting discovery at the LHC with reasonable integrated luminosity over the interesting region of parameter space. Using our search strategy the LHC will be able to exclude m μ ˜ 200 GeV for Δ m 60 GeV at 1.5 3 σ with 1000 fb - 1 of integrated luminosity. Although we focus on a particular model, the results generalize to a variety of scenarios in which the dark matter and a leptonic partner are nearly degenerate in mass, and especially to scenarios featuring a scalar mediator.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [2]
  1. Texas A & M Univ., College Station, TX (United States)
  2. Sam Houston State Univ., Huntsville, TX (United States)
  3. Oklahoma State Univ., Stillwater, OK (United States)
  4. Univ. of Hawaii, Honolulu, HI (United States)
  5. Univ. of Utah, Salt Lake City, UT (United States)
  6. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
OSTI Identifier:
1598585
Alternate Identifier(s):
OSTI ID: 1405048
Grant/Contract Number:  
SC0010504; FG02-13ER42020; SC0016013; SC007859; PHY-1521105; PHY-1250573; PHY-1417367; SC0010813
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 7; 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; Extensions of fermion sector; Extensions of gauge sector; Particle decays; Supersymmetry

Citation Formats

Dutta, Bhaskar, Fantahun, Kebur, Fernando, Ashen, Ghosh, Tathagata, Kumar, Jason, Sandick, Pearl, Stengel, Patrick, and Walker, Joel W. Probing squeezed bino-slepton spectra with the Large Hadron Collider. United States: N. p., 2017. Web. https://doi.org/10.1103/PhysRevD.96.075037.
Dutta, Bhaskar, Fantahun, Kebur, Fernando, Ashen, Ghosh, Tathagata, Kumar, Jason, Sandick, Pearl, Stengel, Patrick, & Walker, Joel W. Probing squeezed bino-slepton spectra with the Large Hadron Collider. United States. https://doi.org/10.1103/PhysRevD.96.075037
Dutta, Bhaskar, Fantahun, Kebur, Fernando, Ashen, Ghosh, Tathagata, Kumar, Jason, Sandick, Pearl, Stengel, Patrick, and Walker, Joel W. Thu . "Probing squeezed bino-slepton spectra with the Large Hadron Collider". United States. https://doi.org/10.1103/PhysRevD.96.075037. https://www.osti.gov/servlets/purl/1598585.
@article{osti_1598585,
title = {Probing squeezed bino-slepton spectra with the Large Hadron Collider},
author = {Dutta, Bhaskar and Fantahun, Kebur and Fernando, Ashen and Ghosh, Tathagata and Kumar, Jason and Sandick, Pearl and Stengel, Patrick and Walker, Joel W.},
abstractNote = {In this study, we consider a minimal supersymmetric Standard Model scenario in which the only light superparticles are a binolike dark matter candidate and a nearly degenerate slepton. It is notoriously difficult to probe this scenario at the Large Hadron Collider (LHC), because the slepton pair-production process yields a final state with soft leptons and small missing transverse energy. We study this scenario in the region of parameter space where the mass difference between the lightest neutralino and the lightest slepton (Δm) is ≲60 GeV, focusing on the process in which an additional radiated jet provides a transverse boost to the slepton pair. We then utilize the angular separation of the leptons from each other and from the missing transverse energy, as well as the angular separation between the jet and the missing transverse energy, to distinguish signal from background events. We also use the reconstructed ditau mass, the cosθℓ1ℓ2* variable, and for larger Δm, a lower bound on the lepton pT. These cuts can dramatically improve both signal sensitivity and the signal-to-background ratio, permitting discovery at the LHC with reasonable integrated luminosity over the interesting region of parameter space. Using our search strategy the LHC will be able to exclude mμ˜≈200 GeV for Δm≲60 GeV at 1.5–3σ with 1000 fb-1 of integrated luminosity. Although we focus on a particular model, the results generalize to a variety of scenarios in which the dark matter and a leptonic partner are nearly degenerate in mass, and especially to scenarios featuring a scalar mediator.},
doi = {10.1103/PhysRevD.96.075037},
journal = {Physical Review D},
number = 7,
volume = 96,
place = {United States},
year = {2017},
month = {10}
}

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    Works referencing / citing this record:

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