Measurement of the W boson polarisation in t¯t events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS

This paper presents a measurement of the polarisation of W bosons from t¯t decays, reconstructed in events with one high-p<sub>T</sub> lepton and at least four jets. Data from pp collisions at the LHC were collected at √s = 8 TeV and correspond to an integrated luminosity of 20.2 fb<s...

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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Exactas
Física
w boson
Polarización
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/81860
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-81860
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
w boson
Polarización
spellingShingle Ciencias Exactas
Física
w boson
Polarización
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Measurement of the W boson polarisation in t¯t events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS
topic_facet Ciencias Exactas
Física
w boson
Polarización
description This paper presents a measurement of the polarisation of W bosons from t¯t decays, reconstructed in events with one high-p<sub>T</sub> lepton and at least four jets. Data from pp collisions at the LHC were collected at √s = 8 TeV and correspond to an integrated luminosity of 20.2 fb<sup>−1</sup>. The angle θ* between the b-quark from the top quark decay and a direct W boson decay product in the W boson rest frame is sensitive to the W boson polarisation. Two different W decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying W boson, respectively. The most precise measurement of the W boson polarisation via the distribution of cos θ* is obtained using the leptonic analyser and events in which at least two of the jets are tagged as b-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are F<sub>0</sub> = 0.709 ± 0.019, F<sub>L</sub> = 0.299 ± 0.015 and F<sub>R</sub> = −0.008 ± 0.014, and are the most precisely measured W boson polarisation fractions to date. Limits on anomalous couplings of the W tb vertex are set.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Measurement of the W boson polarisation in t¯t events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS
title_short Measurement of the W boson polarisation in t¯t events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS
title_full Measurement of the W boson polarisation in t¯t events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS
title_fullStr Measurement of the W boson polarisation in t¯t events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS
title_full_unstemmed Measurement of the W boson polarisation in t¯t events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS
title_sort measurement of the w boson polarisation in t¯t events from pp collisions at √s = 8 tev in the lepton + jets channel with atlas
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/81860
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