Dresden 2013 – scientific programme

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T: Fachverband Teilchenphysik

T 49: Higgs Updates

T 49.9: Talk

Thursday, March 7, 2013, 18:45–19:00, HSZ-01

Study of the spin and CP
of the Higgs-like resonance
through a multivariate analysis
in the H → WW^(*) → ℓ ν ℓ′ ν′ channel
with the ATLAS Detector — •Manuela Venturi, Karl Jakobs, and Tuan Vu-Anh — Albert-Ludwigs-Universitaet, Freiburg, Germany

In July 2012, the ATLAS collaboration reported a 5σ evidence for the production of a new particle, decaying into pairs of gauge bosons, with a rate compatible to the one expected for the Standard Model Higgs boson.

To better elucidate the nature of this new boson, the following step consists in measuring its properties, such as its couplings to other particles, its spin and CP quantum numbers.

With the data collected so far by the ATLAS experiment, an analysis has been performed to determine the spin and parity of the new boson. A multivariate analysis provides the most sensitive results, since it does not require tight selection cuts (thus allowing for a high signal efficiency) and is able to exploit the correlations among kinematic variables.

In this talk, preliminary results for different spin/CP scenarios, obtained with a Boosted Decision Tree technique on the 2012 dataset, at a centre-of-mass energy of √s=8 TeV, are shown.