SUSY morph studies of inclusive spectra 04.09.2009 Max Baak and - - PowerPoint PPT Presentation

SUSY morph studies of inclusive spectra

04.09.2009

Max Baak and Stefan Gadatsch

FourMeff, m0=1140 fixed kernel p.d.f. with mirroring turned on for both sides morph samples with m1/2=570, 690, 750 fit data at m1/2=630 generate and fit 1000 toy samples, each 5000 events with morphed p.d.f.

Test of morph- & fit stability: Meffective

TransMass , m0=1140 fixed kernel p.d.f. with mirroring turned on for both sides morph samples with m1/2=570, 690, 750 fit data at m1/2=630 generate and fit 1000 toy samples, each 5000 events with morphed p.d.f.

Test of morph & fit stability: Mtransverse

FourMeff , m0=1140 fixed kernel p.d.f. with mirroring turned on for both sides morph samples with m1/2=570, 690, 750 fit data at m1/2=630 generate 1000 toy samples, each 5000 events from real p.d.f. at m1/2=630 fit morphed p.d.f. to the toydata

Test of mSUGRA grid continuity: Meffective

TransMass , m0=1140 fixed kernel p.d.f. with mirroring turned on for both sides morph samples with m1/2=570, 690, 750 fit data at m1/2=630 generate 1000 toy samples, each 5000 events from real p.d.f. at m1/2=630 fit morphed p.d.f. to the toydata

Test of mSUGRA grid continuity: Mtransverse

Current problems in RooFit

problems with p.d.f. normalization in RooFit for every value of ai the normalization of the stretched pi is recalculated

• the calculation is not factorized as should be done
• started to implement analytical integral ourselves

normalization for two observables Meffective and Mtransverse is too slow to be practical all the plots shown here have been made with keyspdf ideally for many templates want to work with histograms which are computionally fast when we use histograms the numerical integration is a nightmare

• discontinuous jumps cannot be modelled with a spline

meeting Wouter today to discuss these problems