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Missing Transverse Energy Calibration in W/Z(+jets) Events

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Presentation on theme: "Missing Transverse Energy Calibration in W/Z(+jets) Events"— Presentation transcript:

1 Missing Transverse Energy Calibration in W/Z(+jets) Events
Jason Nielsen Santa Cruz Institute for Particle Physics University of California, Santa Cruz UC Davis HEFTI Workshop on Missing Energy Signals at LHC April 1, 2009

2 Missing Energy Calibration
Goals for calibration: Resolution (measured for at least one point) Linearity (requires at least two points) Extrapolation (unknown requirements) Z/W (+jet) events provide a known true missing transverse energy Assume for now that any effects of MET on acceptance can be unfolded/corrected Also assume backgrounds are small (Z), or can be measured in-situ (W) J. Nielsen Davis Missing Energy 2009

3 MET Scale from Z(ee) Events
Define projection axis along Z momentum Note this is anti-parallel to the hadronic recoil system Elong gives measure of energy scale, Eperp gives angular resolution Find that Elong is the challenge J. Nielsen Davis Missing Energy 2009

4 Artificial Z Decays to Neutrinos
Replace one lepton from Z by neutrino to simulate W decay with nonzero MET In simulation, true MET is the ET of removed lepton In collider data, will remove calorimeter deposits associated with lepton J. Nielsen Davis Missing Energy 2009

5 MET in W Events Choice of measuring W mass or calibrating MET!
MET smearing does not completely wash out sensitivity to W transverse mass Numerical methods for convoluting mass with resolution functions Resolutions measured in early W/Z analyses J. Nielsen Davis Missing Energy 2009

6 Results from Many Samples
Check samples with larger true MET: top pairs, SUSY LSPs, high-mass tau pairs These high-MET samples don’t have a “truth” handle which is known a priori – taken from simulation J. Nielsen Davis Missing Energy 2009

7 Extrapolation to Higher Energies
These data-driven methods are limited to the low-energy bulk of the MET distribution How to get to the 300 GeV regime? J. Nielsen Davis Missing Energy 2009

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