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Title: Higgs and Z assisted stop searches at hadron colliders

Journal Article · · Journal of High Energy Physics (Online)
 [1]; ORCiD logo [2]
  1. Univ. of Arizona, Tucson, AZ (United States). Dept. of Physics
  2. Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
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Current searches for the light top squark (stop) mostly focus on the decay channels of \( \tilde{t}\to t{\chi}_1^0 \) or \( \tilde{t}\to b{\chi}_1^{\pm}\to bW{\chi}_1^0 \) , leading to Open image in new window final states for stop pair productions at the LHC. However, in supersymmetric scenarios with light neutralinos and charginos other than the neutralino lightest supersymmetric particle (LSP), more than one decay mode of the stop could be dominant. While those new decay modes could significantly weaken the current stop search limits at the LHC, they also offer alternative discovery channels for stop searches. In this paper, we studied the scenario with light Higgsino next-to-LSPs (NLSPs) and Bino LSP. The light stop decays primarily via \( {\tilde{t}}_1\to t{\chi}_2^0/{\chi}_3^0 \) , with the neutralinos subsequent decaying to a Z boson or a Higgs boson: χ 2° /χ 3 ° → χ 1 ° h/Z. Pair production of light stops at the LHC leads to final states of Open image in new window or Open image in new window . We consider three signal regions: one charged lepton (1ℓ), two opposite sign charged leptons (2 OS ℓ) and at least three charged leptons (≥3ℓ). We found that the 1ℓ signal region of channel Open image in new window has the best reach sensitivity for light stop searches. For 14 TeV LHC with 300 fb-1 integrated luminosity, a stop mass up to 900 GeV can be discovered at 5σ significance, or up to 1050 GeV can be excluded at 95% C.L. Combining all three decay channels for 1ℓ signal region extends the reach for about 100–150 GeV. We also studied the stop reach at the 100 TeV pp collider with 3 ab-1 luminosity, with discovery and exclusion reach being 6 TeV and 7 TeV, respectively.

Research Organization:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-04ER41298
OSTI ID:
1507710
Journal Information:
Journal of High Energy Physics (Online), Vol. 2018, Issue 5; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (20)

Table 1(p. 5)table Table 1
Table 2(p. 5)table Table 2
Figure 1(p. 6)figure Figure 1
Table 3(p. 6)table Table 3
-1 are used here." data-ostiid="1507710">
Figure 2(p. 7)figure Figure 2
-1 are used here. Right panel shows the recast of the CMS $$\tilde{t}_2$$ limits to the plane of $$m_{\tilde{t}_1}$$ vs $$m_{χ{0\atop{1}}}$$, considering $$\tilde {t}_1 \tilde{t}{*\atop{1}}$$ production with decays of $$\tilde{t}_1 \rightarrow tχ{0\atop{2,3}} \rightarrow th/Zχ{0\atop{1}}$$." data-ostiid="1507710">
Figure 3(p. 8)figure Figure 3
Table 4(p. 10)table Table 4
Table 5(p. 11)table Table 5
Figure 4(p. 12)figure Figure 4
Figure 5(p. 12)figure Figure 5
Table 6(p. 13)table Table 6
Figure 6(p. 14)figure Figure 6
Table 7(p. 14)table Table 7
-1 integrated luminosity. $$μ$$ is fixed to be M1 + 150 GeV." data-ostiid="1507710">
Figure 7(p. 15)figure Figure 7
Figure 8(p. 16)figure Figure 8
Figure 8(p. 16)figure Figure 8
Figure 9(p. 18)figure Figure 9
Table 8(p. 19)table Table 8
Figure 10(p. 20)figure Figure 10
Figure 11(p. 20)figure Figure 11

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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