Measurement of the W boson polarization in top quark decays with the ATLAS detector
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Measurement of the W boson polarization in top quark decays with the ATLAS detector

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Measurement of the W boson polarization in top quark decays with the ATLAS detector

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ATLAS Collaboration; Mitsou, Vasiliki; Fuster Verdú, Juan A. Perfil; Ferrer Soria, Antonio Perfil; Cabrera Urbán, Susana Perfil; García García, Carmen Perfil; Castillo Giménez, María Victoria Perfil; Higón Rodríguez, Emilio Perfil; Martí García, Salvador; Ros Martínez, Eduardo; González de la Hoz, Santiago Perfil; Salt Cairols, José Perfil; Valls Ferrer, Juan Antonio; Kaci, Mohammed; Fiorini, Luca; Hernández Jiménez, Yesenia; Lacasta Llácer, Carlos; Villaplana Pérez, Miguel
Aquest document és un/a article, creat/da en: 2012
This paper presents measurements of the polarization of W bosons in top quark decays, derived from t (t) over bar events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb(-1). The measured fractions of longitudinally, left-and right-handed polarization are F-0 = 0.67 +/- 0.07, F-L = 0.32 +/- 0.04 and F-R = 0.01 +/- 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings.

    ATLAS Collaboration (Aad, G. Mitsou, Vasiliki Fuster Verdú, Juan Antonio Ferrer Soria, Antonio Cabrera Urbán, Susana García García, Carmen Castillo Giménez, María Victoria Higón Rodríguez, Emilio Martí García, Salvador Ros Martínez, Eduardo González de la Hoz, Santiago Salt Cairols, José Valls Ferrer, Juan Antonio Kaci, Mohammed Fiorini, Luca Hernández Jiménez, Yesenia Lacasta Llácer, Carlos Villaplana Pérez, Miguel 2012 Measurement of the W boson polarization in top quark decays with the ATLAS detector Journal of High Energy Physics 2012 06-088 1 46
http://dx.doi.org/10.1007/JHEP06(2012)088
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