ATLAS Sensitivity to the Standard Model Higgs in the HW and HZ Channels at High Transverse Momenta

This page contains approved plots and results as they appear in the ATL-PHYS-PUB-2009-088 note. Only the note contains all the relevant information and should thus be consulted if one of the plots is used.

Caption: (Left) Invariant mass distribution of the Higgs candidates in the WH signal sample for various values of the y_cut clustering parameter, before application of b-tagging and jet vetoes. Numbers are projected to an integrated luminosity of 30 fb^-1. (Right) Distribution of the y parameter values for the signal and various backgrounds in the lν channel, after the analysis selection is applied, except for the b-tagging requirement. The histograms are normalized to an area of 1.

Caption: Distributions of the kinematics of the bb system in the Wbb background comparing HERWIG (Wg -> bb PS) and AcerMC (Wbb ME), after selecting bb pairs with p_t > 200 GeV and 1.3 > Δ R (bb) >0.3. The left plot shows the mass distribution for the bb pair, the right plot the same quantity divided by its transverse momentum. Both distributions are normalised to their relative cross sections in fb.

Caption: Rejection against light-quark jets (left) and against charm-quark jets (right) as a function of the b-tagging efficiency on the single subjet, for both the COMB and JetFitter b-tagging algorithms. The performance for the JetFitter algorithm is also shown after dedicated optimisation to reject c-jets.

Caption: Statistical significance (left) and signal over background ratio (right) after 30 fb^-1 for the lνbb channel as a function of the signal efficiency corresponding to a certain b-tagging cut, using either the ATLAS default combined b-tagging algorithm or the JetFitter algorithm tuned with a prior background light-jet content of 20%.

Caption: Distribution of the invariant mass of the Higgs candidate after all selection cuts. (a) lνbb channel (b) llbb channel and (c) MET bb channel. The signals (for m_H = 120~GeV) are shown on top of the backgrounds. All distributions are normalized to an integrated luminosity of 30 fb^-1.

Caption: q(0) (left) and significance (right) for a range of possible signal experiments.
[with an integrated luminosity of 30 fb^-1]