Abstract

A measurement of the production cross-section for top quark pairs($ttbar$) in pp collisions at $sqrt{s}=7 TeV$ is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron e or muon μ) with large missing transverse energy and at least four jets, and dilepton (ee, μμ or eμ) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb-1, 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-$ttbar$ Standard Model processes are estimated using data-driven methods and determined to be 12.2±3.9 events and 2.5±0.6 events, respectively. The kinematic properties of the selected events are consistent with SM $ttbar$ production. The inclusive top quark pair production cross-section is measured to be $sigmattbar=145 pm 31 ^{+42}_{-27}$ pb where the first uncertainty is statistical and the second systematic. The measurement agrees with perturbative QCD calculations.

Autore Pugliese

• Gorini Edoardo , Ventura Andrea , Spagnolo Stefania Antonia

Tutti gli autori

• G. AAD , M. BIANCO , G. CHIODINI , M. R. COLUCCIA , E. GORINI , M. PRIMAVERA , S. SPAGNOLO , A. VENTURA , ET AL.

Titolo volume/Rivista

THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS

Anno di pubblicazione

2011

ISSN

1434-6044

ISBN

Non Disponibile

Numero di citazioni Wos

39

Ultimo Aggiornamento Citazioni

28/04/2018

Numero di citazioni Scopus

21

Ultimo Aggiornamento Citazioni

28/04/2018

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile