Dr. Terrance Figy Assistant Professor

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Presentation transcript:

Stress-Testing the VBF Approximation with Higgs Boson plus Three Jet Production Dr. Terrance Figy Assistant Professor Department of Mathematics, Statistic, and Physics Wichita State University September 30, 2017 University of Kansas Particle Physics on the Plains

Vector Boson Fusion Energetic jets in the forward/backward directions. Higgs decays products in central rapidity region. Suppressed QCD radiation in central rapidity region.

Vector Boson Fusion Energetic jets in the forward/backward directions. Higgs decays products in central rapidity region. Suppressed QCD radiation in central rapidity region.

Vector Boson Fusion + Jet

Vector Boson Fusion + Jet

H+3 Jets via VBF (only t-channels) Total Cross Section Scale Variations: LO: +26% to -19% NLO: less than 5% JHEP 0802 (2008) 076 [arXiv:0710.5621]

H+3 Jets via VBF (only t-channels) No pentagon or hexagon diagrams included. Approximate as two deeply inelastic scattering processes that exchange a gauge boson. JHEP 0802 (2008) 076 [arXiv:0710.5621]

Going for all of it: EW H+3 Jets

Going for all of it: EW H+3 Jets Virtual Corrections

Going for all of it: EW H+3 Jets Real Corrections

Going for all of it: EW H+3 Jets

EW H+3 Jets: Implementation Details F. Campario, T. M. Figy, S. Platzer, and M. Sjodahl, PRL 111, 211802 Matchbox [S. Platzer and S. Gieseke, arXiv:1109.6256] Catani-Seymour Dipole subtraction [hep-ph/9605323] Subtractive and POWHEG style matching to parton shower ColorFull [M. Sjodahl, arXiv:1211.2099, http://colorfull.hepforge.org] Tensorial Reduction [F. Capanario, arXiv:1105.0920] Scalar Loop Integrals: OneLOop [A. van Hameren arXiv:1007.4716 ]

EW H+3 Jets: Publicly Available Herwig 7 (https://herwig.hepforge.org) Herwig 7/Herwig++ 3.0 Release Note

Input Parameters 14 TeV (proton - proton LHC) At least three anti-KT D=0.4 (E-scheme recombination) of 20 GeV and rapidity within -4.5 and 4.5 using FastJet [arXiv:0802.1189, arXiv:1111.6097] PDF choices: CT10 for NLO and CTEQ 6L1 for LO [arXiv:hep-ph/0201195, arXiv:1007.2241] Scales: W-boson mass (MW) and sum of transverse momentum of reconstructed jets (HT)

Notation:

EW H+3 Jets: Scale Uncertainties

EW H+3 Jets: The Third Jet

EW H+3 Jets: The Third Jet Transverse momentum of third jet.

EW H+3 Jets: Jet Masses

EW H+3 Jets: Higgs Boson

Comparison to VBFNLO In collaboration with Simon Platzer, Peter Schichtel, and Michael Rauch. Collider Energy and Cuts used: Anti-kt jet clustering with R=0.4 PDF set: MMHT2014 Scales: HT(jets) You must update all plots in this section.

Comparison to VBFNLO: Inclusive Cuts HJets VBFNLO

Comparison to VBFNLO: VBF cuts

Comparison to VBFNLO: VBF cuts HJets VBFNLO

LO Comparison to VBFNLO Inclusive Cuts VBF cuts

LO Comparison to VBFNLO Inclusive Cuts VBF cuts

NLO Comparison to VBFNLO Inclusive Cuts VBF Cuts

NLO Comparison to VBFNLO Inclusive Cuts VBF Cuts

NLO+Parton Shower Results Compared HJETS++ with POWHEG BOX at the level of NLO+PS. Deviations between the results of HJETS++ and POWHEG BOX due the various approximations implemented in POWHEG BOX. (The core matrix elements in POWHEG BOX are essentially taken from VBFNLO).

NLO+Parton Shower Results Collider Energy and Cuts used: Anti-kt jet clustering with R=0.4 PDF set: four flavor CT10 Results included in the “Handbook of LHC Higgs Cross Section: 4”, LHC HXWG, arXiv:1610.07922.

NLO+Parton Shower Results

NLO+Parton Shower Results

Conclusions I have discussed the implementation of the full NLO QCD corrections for electroweak Higgs boson production in association with three jets at the LHC within the Matchbox framework of Herwig 7. Kinematic distributions have been presented at fixed order at NLO and at NLO+PS. Questions?