1.

Record Nr.

UNINA9910300414003321

Autore

Lemmer Boris

Titolo

Spin Correlations in tt Events from pp Collisions : Measured at √s = 7 TeV in the Lepton+Jets Final State with the ATLAS Detector / / by Boris Lemmer

Pubbl/distr/stampa

Cham : , : Springer International Publishing : , : Imprint : Springer, , 2015

ISBN

3-319-18932-8

Edizione

[1st ed. 2015.]

Descrizione fisica

1 online resource (246 p.)

Collana

Springer Theses, Recognizing Outstanding Ph.D. Research, , 2190-5053

Disciplina

539.7212

Soggetti

Elementary particles (Physics)

Quantum field theory

String theory

Physical measurements

Measurement   

Elementary Particles, Quantum Field Theory

Quantum Field Theories, String Theory

Measurement Science and Instrumentation

Lingua di pubblicazione

Inglese

Formato

Materiale a stampa

Livello bibliografico

Monografia

Note generali

Description based upon print version of record.

Nota di bibliografia

Includes bibliographical references and index at the end of each chapters.

Nota di contenuto

Standard Model, Top Quarks and Spin Correlation -- Experimental Setup -- Analysis Objects -- Dataset, Signal and Background Modelling -- Event Selection and Reconstruction -- Analysis Strategy -- Systematic Uncertainties -- Results -- Summary, Conclusion and Outlook.

Sommario/riassunto

This thesis introduces readers to the Standard Model, the top quark and its properties, before explaining the concept of spin correlation measurement. The first measurement of top quark spin correlations at the LHC in the lepton+jets decay channel is presented. As the heaviest elementary particle, the top quark plays an essential role in the Standard Model of elementary particle physics. In the case of top quarks being produced in pairs at hadron colliders, the Standard Model



predicts their spins to be correlated. The degree of correlation depends on both the production mechanism and properties of the top quark. Any deviation from the Standard Model prediction can be an indicator for new physics phenomena. The thesis employs an advanced top quark reconstruction algorithm including dedicated identification of the up- and down-type quarks from the W boson decay.