Tests of the Spin and Parity of the Higgs Boson with CDF

1Oxford University, 2LANL, 3FNAL, 4University of Virginia, 5UC Davis, 6Baylor University, USA

Documentation:

CDF Public Note 11103

Contents

Abstract

We perform tests of the spin and parity of the Higgs boson using dedicated searches for two specific non-standard Higgs boson hypotheses: a pseudoscalar Higgs boson with JP = 0 and a graviton-like Higgs boson, with JP = 2+, both assuming a boson mass mX = 125 GeV/c2. We search for these exotic states in the WX ➝ lvbb, ZX ➝ llbb, and (WX + ZX) ➝ METbb modes, making use of expected kinematical differences between events containing exotic Higgs bosons and those containing Standard Model Higgs bosons. The data correspond to an integrated luminosity of 9.45 fb-1. We observe no significant deviations in the data from the predictions of the Standard Model with a Higgs boson of mass mH = 125 GeV/c2, and set bounds on the possible rate of production of each exotic state, both allowing for an admixture of Standard Model production and exotic production, and assuming only exotic production.

Tables

Posterior probability densities

2-dimensional llbb posterior density of the measured 2+-vs.-0+ (left) and 0--vs.-0+ (right) cross sections, normalized to the SM predictions.
2-dimensional lvbb posterior density of the measured 2+-vs.-0+ (left) and 0--vs.-0+ (right) cross sections, normalized to the SM predictions.
2-dimensional METbb posterior density of the measured 2+-vs.-0+ (left) and 0--vs.-0+ (right) cross sections, normalized to the SM predictions.
2-dimensional combined posterior density of the measured 2+-vs.-0+ (left) and 0--vs.-0+ (right) cross sections, normalized to the SM predictions.
2-dimensional combined posterior density of the measured 2+-vs.-0+ (left) and 0--vs.-0+ (right) cross sections, normalized to the SM predictions. Zoomed-in version.

P-values

llbb LLR distributions for 2+ (left) and 0- (right) hypotheses, assuming SM couplings.
lvbb posterior LLR distributions for 2+ (left) and 0- (right) hypotheses, assuming SM couplings.
METbb LLR distributions for 2+ (left) and 0- (right) hypotheses, assuming SM couplings.
Combined LLR distributions for 2+ (left) and 0- (right) hypotheses, assuming SM couplings.

Log10(s/b) plots

Log10(s/b) distributions of the exotic signal divided by the background from all search channels for 2+ (left) and 0- (right) hypotheses, assuming SM couplings.
Background-subtracted log10(s/b) distributions summed over all search channels for 2+ (left) and 0- (right) hypotheses.

NN discriminants