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Status of Higgs to WW Analysis

Status of Higgs to WW Analysis. Motivation Scope Summary. Nigel Watson (Birmingham Univ.). Overview. Scope. Studies intended for 0.5 , 1.4 , 3 TeV Build on earlier benchmarking work Important to quantify <3 TeV performance Emphasis on physics reach for energy-staged CLIC

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Status of Higgs to WW Analysis

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  1. Status of Higgs to WW Analysis • Motivation • Scope • Summary Nigel Watson (Birmingham Univ.)

  2. Overview Nigel Watson / Birmingham

  3. Scope • Studies intended for 0.5, 1.4, 3 TeV • Build on earlier benchmarking work • Important to quantify <3 TeV performance • Emphasis on physics reach for energy-staged CLIC • Benefit from WW fusion cross-section~log(s/M2) Nigel Watson / Birmingham

  4. Cross-section log(s/M2H) Nigel Watson / Birmingham

  5. WW-fusion • Concentrate on semileptonic final state • 4-jet final state in parallel • Both channels, assume on W will be ~on shell • Backgrounds Nigel Watson / Birmingham

  6. Nigel Watson / Birmingham

  7. LEP/SLD: optimal jet reconstruction by energy flow • Explicit association of tracks/clusters • Replace poor calorimeter measurements with tracker measurements – no “double counting” E/E = 60%/E E/E = 30%/E Mass (jet3+jet4) Mass (jet3+jet4) Little benefit from beam energy constraint, cf. LEP Equivalent best LEP detector Goal at ILC Mass (jet1+jet2) Mass (jet1+jet2) ILC: high performance calorimetry • Essential to reconstruct jet-jet invariant masses in hadronic final states, e.g. separation of W+W,Z0Z0, tth, Zhh, H Nigel Watson / Birmingham

  8. Little benefit from beam energy constraint, cf. LEP Nigel Watson / Birmingham

  9. Compare PFAs using W+W- scattering All 2-jet mass pairs GeV 2-jet mass pairs, pairing selection GeV [W.Yan, DR Ward] Nigel Watson / Birmingham

  10. Higgs self coupling study • Michele slides I • ExploitsPandoraPFA, compares with other public algorithms (Wolf, newertrackbased PFA) • Significantly better performance in Pandora PFA in mean and resolution Z→mm [M.Faucci Giannelli] Nigel Watson / Birmingham

  11. MAPS • Siliconpixel readout, minimal interlayer gaps, stability – prohibitive cost? • UK developing “swap-in” alternative to baseline Si diode designs in ILD (+SiD) • CMOS process, more mainstream: • Industry standard, multiple vendors (schedule, cost) • (At least) as performant – ongoing studies • Simpler assembly • Power consumption larger than analogue Si, ~x40 with 1st sensors, BUT • ~Zero effort on reducing this so far • Better thermal properties (uniform heat load), perhaps passive cooling • Factor ~10 straightforward to gain (diode size, reset time, voltage) Nigel Watson / Birmingham

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