Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at √s=13 TeV
A search for the pair production of the lightest supersymmetric partner of the top quark (et1) is presented. The search focuses on a compressed scenario where the mass difference between the top squark and the lightest supersymmetric particle, often considered to be the lightest neutralino (χe 0...
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| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English English |
| Published: |
Springer Nature
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/70394/1/70394_Search%20for%20top%20squarks%20decaying%20via%20four-body_article.pdf http://irep.iium.edu.my/70394/2/70394_Search%20for%20top%20squarks%20decaying%20via%20four-body_scopus.pdf http://irep.iium.edu.my/70394/ https://link.springer.com/content/pdf/10.1007%2FJHEP09%282018%29065.pdf |
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| Summary: | A search for the pair production of the lightest supersymmetric partner of
the top quark (et1) is presented. The search focuses on a compressed scenario where the
mass difference between the top squark and the lightest supersymmetric particle, often
considered to be the lightest neutralino (χe
0
1
), is smaller than the mass of the W boson.
The proton-proton collision data were recorded by the CMS experiment at a centre-of-mass
energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb−1
. In this search,
two decay modes of the top squark are considered: a four-body decay into a bottom quark,
two additional fermions, and a χe
0
1
; and a decay via an intermediate chargino. Events
are selected using the presence of a high-momentum jet, significant missing transverse
momentum, and a low transverse momentum electron or muon. Two analysis techniques
are used, targeting different decay modes of the et1: a sequential selection and a multivariate
technique. No evidence for the production of top squarks is found, and mass limits at 95%
confidence level are set that reach up to 560 GeV, depending on the m(et1) − m(χe
0
1
) mass
difference and the decay mode. |
|---|