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Search for supersymmetry in events with at least three electrons or muons, jets, and missing transverse momentum in proton-proton collisions at root s=13 TeV

Title
Search for supersymmetry in events with at least three electrons or muons, jets, and missing transverse momentum in proton-proton collisions at root s=13 TeV
Author
김태정
Keywords
Hadron-Hadron scattering (experiments); Supersymmetry; Lepton production
Issue Date
2018-02
Publisher
SPRINGER
Citation
JOURNAL OF HIGH ENERGY PHYSICS, no. 2, Article no. 067
Abstract
A search for new physics is carried out in events with at least three electrons or muons in any combination, jets, and missing transverse momentum. Results are based on the sample of proton-proton collision data produced by the LHC at a center-of-mass energy of 13TeV and collected by the CMS experiment in 2016. The data sample analyzed corresponds to an integrated luminosity of 35.9 fb(-1). Events are classified according to the number of b jets, missing transverse momentum, hadronic transverse momentum, and the invariant mass of same-flavor dilepton pairs with opposite charge. No significant excess above the expected standard model background is observed. Exclusion limits at 95% confidence level are computed for four different supersymmetric simplified models with pair production of gluinos or third-generation squarks. In the model with gluino pair production, with subsequent decays into a top quark-antiquark pair and a neutralino, gluinos with masses smaller than 1610 GeV are excluded for a massless lightest supersymmetric particle. In the case of bottom squark pair production, the bottom squark masses are excluded up to 840 GeV for charginos lighter than 200 GeV. For a simplified model of heavy top squark pair production, the (t) over tilde (2) mass is excluded up to 720, 780, or 710 GeV for models with an exclusive (t) over tilde (2) -> (t) over tilde H-1 decay, an exclusive (t) over tilde (2) -> (t) over tilde (1)Z decay, or an equally probable mix of those two decays. In order to provide a simplified version of the analysis for easier interpretation, a small set of aggregate signal regions also has been de fined, providing a compromise between simplicity and analysis sensitivity.
URI
https://link.springer.com/article/10.1007%2FJHEP02%282018%29067https://repository.hanyang.ac.kr/handle/20.500.11754/117509
ISSN
1029-8479
DOI
10.1007/JHEP02(2018)067
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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