Mtt Resonance Search in all jets (2.8 fb-1)

Univ. of Florida: Y.Oksuzian, N. Goldschmidt, J. Konigsberg, J. Lungu, V. Necula, R. Rossin, S. Sukhanov


Analysis Summary

->We present a blind search for resonant top-antitop pair production  and subsequent decay in the all-hadronic channel. We apply a powerful reconstruction technique where the observed event kinematics are constrained according to the full standard model top-antitop production and decay matrix element.

->Probability density from the per-event matrix element calculation is used as discriminant to reduce and control the large backgrounds of the all-hadronic channel. The discriminant serves as an input to neural net with other kinematic variables.

Results


MttWideDataSMWideLog
Mtt distribution from data vs expected SM background in the >400 GeV search region

DataSMDataSMLog
Mtt distribution from data vs expected SM background in the >400 GeV search region(fine binning)

UL
95% CL upper limits on the cross section for resonance production
 


Yuri Oksuzian (last update June 2nd 2009) -- oksuzian@fnal.gov