INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of W boson polarization in top quark decays with the ATLAS detector
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
JOURNAL OF HIGH ENERGY PHYSICS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2012 vol. 213 p. 1 - 23
ISSN:
1126-6708
Resumen:
This paper presents measurements of the polarization of W bosons in top
quark decays, derived from ttbar 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.