EW precision measurement at Z pole

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Presentation transcript:

EW precision measurement at Z pole Zhijun Liang IHEP

Z pole physics in pre-CDR Some study on expected precision based on extrapolation from LEP results. No full simulation study yet

Z pole physics: Plan for CDR Study Physics Requirement for accelerator Z mass Weak mixing angle W mass Requirement for detector Z->bb branching ratio (R_b) Z->cc branching ratio (R_c)

Plan for Weak mixing angle More details in Mengran’s talk Truth distribution From Z fitter unFolding matrix Reco level distribution

Physics Requirement for accelerator Expected Beam momentum scale uncertainty CEPC pre-CDR : 500keV (1010 Z) FCC-ee : 100keV (1013 Z) Requested by FCC-ee experts to do more study Propagate beam momentum scale uncertainty to all EW measurement. Give a clear physics requirement to accelerator

W Mass measurement Two methods for W mass measurement WW threshold scan (beam momentum uncertainty) Requested by FCC/ILC experts at ICHEP2016 Direct measurement in ZH runs in WW->lvjj events Jet energy scale/resolution uncertainty beam momentum uncertainty WW threshold scan by LEP Fullsim WW->lvjj in ZH run By Manqi

Candidate of branch mark channel at Z pole Requirement on CEPC beam momentum uncertainty Weak mixing angle and Z mass , semi-fullsim W Mass (threshold scan), Z fitter level study Requirement on TPC detector occupancy (track efficiency) Weak mixing angle Requirement on pixel detector optimization (impact parameter) Z->bb branching ratio (R_b) ,need fullsim Z->cc branching ratio (R_c) Requirement on calorimeter (Jet energy scale/resolution ) W mass (direct method) , fullsim Requirement on calorimeter (granularity, tauID ) Z-> tautau branching ratio

Summary Lots of work for Z pole physics CDR study. Aim for publication of CEPC Z pole physics prospect in one year. Lots of room for contribution We need your contribution !