Introduction to HOBIT, a b-Jet Identification Tagger at the CDF Experiment Optimized for Light Higgs Boson Searches

Abstract

We present the development and validation of the Higgs Optimized b Identification Tagger (HOBIT), a multivariate b-jet identification algorithm optimized for Higgs boson searches at the CDF experiment at the Fermilab Tevatron. At collider experiments, b taggers allow one to distinguish particle jets containing B hadrons from other jets; these algorithms have been used for many years with great success at CDF. HOBIT has been designed specifically for use in searches for light Higgs bosons decaying via H ! b\bar{b}. This fact combined with the extent to which HOBIT synthesizes and extends the best ideas of previous taggers makes HOBIT unique among CDF b-tagging algorithms. Employing feed-forward neural network architectures, HOBIT provides an output value ranging from approximately -1 ("light-jet like") to 1 ("b-jet like"); this continuous output value has been tuned to provide maximum sensitivity in light Higgs boson search analyses. When tuned to the equivalent light jet rejection rate, HOBIT tags 54% of b jets in simulated 120 GeV/c2 Higgs boson events compared to 39% for SecVtx, the most commonly used b tagger at CDF. We present features of the tagger as well as its characterization in the form of b-jet finding efficiencies and false (light-jet) tag rates.

40 pages, 16 figues

References in corpus (3)

• PYTHIA 6.4 Physics and Manual
• Measuring the running top-quark mass
• First Measurement of the Ratio sigma_(t-tbar) / sigma_(Z/γ*->ll) and Precise Extraction of the t-tbar Cross Section

Cited by in corpus (24)

• Higgs Boson Studies at the Tevatron
• Observation of s-channel production of single top quarks at the Tevatron
• Tevatron Combination of Single-Top-Quark Cross Sections and Determination of the Magnitude of the Cabibbo-Kobayashi-Maskawa Matrix Element ${\mathbf{V}}_{\mathbf{tb}}$
• Combination of searches for the Higgs boson using the full CDF data set
• Jet Flavour Tagging for Future Colliders with Fast Simulation
• Evidence for $s$-channel Single-Top-Quark Production in Events with one Charged Lepton and two Jets at CDF
• Search for $s$-channel Single Top Quark Production in the Missing Energy Plus Jets Sample using the Full CDF II Data Set
• Updated search for the standard model Higgs boson in events with jets and missing transverse energy using the full CDF data set
• Machine learning techniques in searches for $t\bar{t}h$ in the $h\to b\bar{b}$ decay channel
• Tagging more quark jet flavours at FCC-ee at 91 GeV with a transformer-based neural network
• Tevatron Constraints on Models of the Higgs Boson with Exotic Spin and Parity Using Decays to Bottom-Antibottom Quark Pairs
• Observation of pseudoscalar and tensor resonances in $J/\psi \to \gamma \varphi \varphi$
• Measurement of the production and differential cross sections of $W^{+}{W}^{-}$ bosons in association with jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Updated Measurement of the Single Top Quark Production Cross Section and $Vtb$ in the Missing Transverse Energy Plus Jets Topology in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV
• Search for the Higgs boson in the all-hadronic final state using the full CDF data set
• Review of Physics Results from the Tevatron
• Searches for the Higgs boson at the Tevatron
• Review of Physics Results from the Tevatron: Higgs Boson Physics
• Standard Model Higgs Boson Searches through the 125 GeV Boson Discovery
• Standard Model Higgs boson searches at the Tevatron
• A Novel in situ Trigger Combination Method
• Constraints on models of the Higgs boson with exotic spin and parity using the full CDF data set
• Tevatron Higgs results
• Higgs physics at the Tevatron