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Search for New Phenomena in tt Events with Large Missing Transverse Momentum in Proton-Proton Collisions at √s=7  TeV with the ATLAS Detector

Contributors

ATLAS Collaboration

Collaborators

Abdelalim Aly, Ahmed Aly; Alexandre, Gauthier; Backes, Moritz; Barone, Gaetano; Bell, Paul; Bell, William; Berglund, Frida Elina; Blondel, Alain; Bucci, Francesca; Clark, Allan Geoffrey; Dao, Valerio; Ferrere, Didier; Gadomski, Szymon; Garcia Navarro, Jose Enrique; Gaumer, Olivier; Gonzalez Sevilla, Sergio; Goulette, Marc; Hamilton, Andrew; Iacobucci, Giuseppe; Leger, Annie; Lister, Alison; Martin Dit Latour, Bertrand; Mora Herrera, Maria Clemencia Rosario; Nektarijevic, Snezana; Nikolics, Katalin; Pasztor, Arpad; Pohl, Martin; Rosbach, Kilian; Rosselet, Laurent; Wu, Xin

Published in

Physical review letters, vol. 108, no. 04, 041805

Publication date

2012

Abstract

A search for new phenomena in tt events with large missing transverse momentum in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The measurement is based on 1.04  fb−1 of data collected with the ATLAS detector at the LHC. Contributions to this final state may arise from a number of standard model extensions. The results are interpreted in terms of a model where new top-quark partners are pair produced and each decay to an on-shell top (or antitop) quark and a long-lived undetected neutral particle. The data are found to be consistent with standard model expectations. A limit at 95% confidence level is set excluding a cross section times branching ratio of 1.1 pb for a top-partner mass of 420 GeV and a neutral particle mass less than 10 GeV. In a model of exotic fourth generation quarks, top-partner masses are excluded up to 420 GeV and neutral particle masses up to 140 GeV.

UNIGE affiliation entities

Citation (ISO format)

ATLAS Collaboration. Search for New Phenomena in tt Events with Large Missing Transverse Momentum in Proton-Proton Collisions at √s=7  TeV with the ATLAS Detector. In: Physical review letters, 2012, vol. 108, n° 04, p. 041805. doi: 10.1103/PhysRevLett.108.041805

Main files (1)

Article (Published version)

Identifiers

Additional URL for this publication

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.108.041805

Journal ISSN

0031-9007
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228downloads

Technical informations

Creation

19/09/2014 11:46:00

First validation

19/09/2014 11:46:00

Update

13/10/2025 22:23:20

Status update

14/03/2023 21:46:59

Last indexation

10/11/2026 17:09:20
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