Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector

A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton–proton collisions at √s = 7 TeV recorded with the ATLAS detector at the LHC, events consistent with tt ̄ production and decay into a single charged lepton final state are reconstruc...

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Autores principales:	Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2014
Materias:	Física top quarks anti-top quarks pp collisions ATLAS detector
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/77608
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-77608
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Física top quarks anti-top quarks pp collisions ATLAS detector
spellingShingle	Física top quarks anti-top quarks pp collisions ATLAS detector Alconada Verzini, María Josefina Alonso, Francisco Anduaga, Xabier Sebastián Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín Fernando The ATLAS Collaboration Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector
topic_facet	Física top quarks anti-top quarks pp collisions ATLAS detector
description	A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton–proton collisions at √s = 7 TeV recorded with the ATLAS detector at the LHC, events consistent with tt ̄ production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields <math><mi mathvariant="normal" is="true">Δ</mi><mi is="true">m</mi><mo is="true">≡</mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><mi is="true">t</mi></mrow></msub><mo is="true">−</mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><mover accent="true" is="true"><mrow is="true"><mi is="true">t</mi></mrow><mrow is="true"><mo is="true">¯</mo></mrow></mover></mrow></msub><mo is="true">=</mo><mn is="true">0.67</mn><mo is="true">±</mo><mn is="true">0.61</mn><mspace width="0.2em" is="true"></mspace><mo stretchy="false" is="true">(</mo><mtext is="true">stat</mtext><mo stretchy="false" is="true">)</mo><mo is="true">±</mo><mn is="true">0.41</mn><mspace width="0.2em" is="true"></mspace><mo stretchy="false" is="true">(</mo><mtext is="true">syst</mtext><mo stretchy="false" is="true">)</mo><mtext is="true"> GeV</mtext></math>, consistent with CPT invariance.
format	Articulo Articulo
author	Alconada Verzini, María Josefina Alonso, Francisco Anduaga, Xabier Sebastián Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín Fernando The ATLAS Collaboration
author_facet	Alconada Verzini, María Josefina Alonso, Francisco Anduaga, Xabier Sebastián Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín Fernando The ATLAS Collaboration
author_sort	Alconada Verzini, María Josefina
title	Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector
title_short	Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector
title_full	Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector
title_fullStr	Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector
title_full_unstemmed	Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector
title_sort	measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 tev using the atlas detector
publishDate	2014
url	http://sedici.unlp.edu.ar/handle/10915/77608
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bdutipo_str	Repositorios
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Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector

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