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Search for R-parity violating decays of a top squark in proton-proton collisions at $\sqrt{s}$ = 8 TeV


CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Search for R-parity violating decays of a top squark in proton-proton collisions at $\sqrt{s}$ = 8 TeV. Physics Letters B, 760:178-201.

Abstract

The results of a search for a supersymmetric partner of the top quark (top squark), pair-produced in proton–proton collisions at $\sqrt{s}$=8 TeV , are presented. The search, which focuses on R-parity violating, chargino-mediated decays of the top squark, is performed in final states with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{−1}$ collected with the CMS detector at the LHC in 2012. The data are found to be in agreement with the standard model expectation, and upper limits are placed on the top squark pair production cross section at 95% confidence level. Assuming a 100% branching fraction for the top squark decay chain, $\tilde{t}→t\tilde{x}^{±}_{1},\tilde{x}^{±}_{1}→ℓ^{±} + jj$ , top squark masses less than 890 (1000) GeV for the electron (muon) channel are excluded for the first time in models with a single nonzero R-parity violating coupling $λ^{′}_{ijk}$ (i,j,k≤2) , where i,j,k correspond to the three generations.

Abstract

The results of a search for a supersymmetric partner of the top quark (top squark), pair-produced in proton–proton collisions at $\sqrt{s}$=8 TeV , are presented. The search, which focuses on R-parity violating, chargino-mediated decays of the top squark, is performed in final states with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{−1}$ collected with the CMS detector at the LHC in 2012. The data are found to be in agreement with the standard model expectation, and upper limits are placed on the top squark pair production cross section at 95% confidence level. Assuming a 100% branching fraction for the top squark decay chain, $\tilde{t}→t\tilde{x}^{±}_{1},\tilde{x}^{±}_{1}→ℓ^{±} + jj$ , top squark masses less than 890 (1000) GeV for the electron (muon) channel are excluded for the first time in models with a single nonzero R-parity violating coupling $λ^{′}_{ijk}$ (i,j,k≤2) , where i,j,k correspond to the three generations.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:10 Jan 2017 11:15
Last Modified:06 Sep 2017 14:16
Publisher:Elsevier
ISSN:0370-2693
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.physletb.2016.06.039

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