High Energy Physics High energy physics at the
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High Energy Physics @ High energy physics at the 2 Tevatron proton-antiproton collider M. Herndon Grad Seminar, 2019 1
CDF Group CDF experimental group Tevatron: 2 Te. V ppbar collider Faculty: Duncan Carlsmith, Matthew Herndon and Lee Pondrom Scientists: James Bellinger, Woo-Hyun Chung Research Assistants: Varsha Ramakrishnan and Jason Nett (graduated this year!) Wisconsin involved in BMU detector maintenance, detector operations, trigger, software operations, tracking and BMU software, silicon and BMU muon data validation, shifts, reviewing analysis, leadership, and physics! M. Herndon Grad Seminar, 2019 2
CDF Wisconsin Physics Direct searches for New Physics Z’ : Prof. Carlsmith (investigating ee signal, published) Jet Physics: QCD and New Physics Quark substructure: Prof. Pondrom Double parton interactions: V. Ramakrishnan, Prof. Carlsmith adv. B Physics Discovery of B** and b, Pursley (published) Bs + -: D. Sperka (U grad – graduated) and Prof. Herndon (published) Higgs and diboson Physics H WW analysis Herndon, Pursley, Nett(three publications, one publication in process) WW, Herndon and Pursley (published) and WZ, Herndon and Nett (publication in process) CDF Wisconsin group is pursuing an interesting and diverse physics M. Herndon Grad Seminar, 2019 program 3
SM Higgs: H WW l l - signature: Two high p. T leptons and MET Primary backgrounds: SM diboson (WW, WZ, ZZ) and top in di-lepton decay channel First Pheno paper: Han Key issue: Maximizing signal acceptance UW innovations. Adding channels sensitive to associated production and vector boson fusion: acceptance! Also designed treatment of uncertainties. W+ H +50% systematic W+ μ+ Wν W- e- ν Spin correlation: Charged leptons go in the same direction M. Herndon Grad Seminar, 2019 4
CDF H WW Search Inclusive search for high mass Higgs with H WW High mass analysis the most sensitive analysis for m. H > 128 Ge. V H WW Channels: Limits @ 165 Ge. V Exp. Limit gg H: 0 Jets 1. 67 gg H: 1 Jet + VH, VBF 2. 35 gg H, VBF: 2+ Jets 3. 16 VH: Trilepton 4. 62 VH: SS leptons 4. 86 gg H: low mll 11. 2 gg H: τl 14. 5 Combined 1. 00 M. Herndon Grad Seminar, 2019 Have reached SM sensitivity at high mass! Research by Jason Nett, Jen Pursley and Matt Herndon 5
Tevatron Higgs Search Exp. Exclusion 156 -173 Ge. V: 0. 76 xσSM @ 165 Ge. V Obs. Exclusion 158 -175 Ge. V M. Herndon Grad Seminar, 2019 6
Discovery Exclusion and Discovery projections: chance of 3 discovery! Expect exclusion from CDF alone this year Sensitivity for order 135 -185 Ge. V exclusion from Tevatron in one year PAC recommended 3 year extension of Tevatron running Tevatron can discover the Higgs before the LHC! >70% chance of 3 discovery with run 3. This could be your Ph. D. thesis! Low Mass discovery High Mass exclusion M. Herndon Grad Seminar, 2019 Analyzed Good Data Run 3 7
