Lucia - LAPP Phi* meeting - 3 novembre Correcting back to the electrons after FSR So far C Z defined w.r.t. electrons before FSR Z status = 3 and look for the first 2 children Which are the C Z if defined w.r.t. electrons after FSR ?? technically: Z status = 2 and look for the first 2 children technically: e, 

Lucia - LAPP Phi* meeting - 3 novembre So why C Z  * after FSR depend so stronger than C Z  * before FSR ? before FSR after FSR P TZ ** CZ calorimeters integrate --> the energy measured is closer to before FSR This is not true for tracks !!

Lucia - LAPP Phi* meeting - 3 novembre Data driven Systematic uncertainty on  * coming from tracking 2) Mesurer  * en fonction du Phi de la trace positive, comparer avec la même distribution pour des traces négatives (pour différentes rapidités du Z) 1) Donner un signe à  * de façon à que si il n’y a pas de bias (mais seulement des effets de résolution) la distribution soit symétrique. Réponse/suggestions de Attilio Andreazza (traduction de l’italien) Utiliser les cosmiques ce n’est pas une solution optimale car les distributions angulaires sont très différentes Utiliser des résonances (V0) n’est pas une bonne idée non plus car éventuels effets de résolution et biais sont dominés par la mesure de l’impulsion Suggestions de Attilio: Réponse de Attilio à mes questions: (Mais comment ??)

Lucia - LAPP Phi* meeting - 3 novembre Proposal for studying the systematic uncertainty coming from tracking e+ (N-)L (N-)R The systematic error results from the difference between data and MC on the difference of (N-)L and (N-)R --> look at  for (N-)L, (N-)R Study  as function of  for BB,BE, EE in data and MC. Apply in MC a possible shift and evaluate the effect on  * --> systematics ‘Physics’ is  symmetric (N-)L = (N-)R Our systematics comes from  and  Same principle for  

Lucia - LAPP Phi* meeting - 3 novembre How to continue(proposal) Discuss this ideas with the Tracking conveners (Attilio) and if OK I’llproceed In the meanwhile, if anybody interested (Ohan?) can look to the suggestion 1) of Attilio or/and any additional welcome suggestion (N-) L (N-) R e+ (N-) L (N-) R  MC-Pythia Data ( no BKG subtraction ) MC-Pythia Data ( no BKG subtraction ) (N-) L (N-) R First results (BB) : e- 

Lucia - LAPP Phi* meeting - 3 novembre Proposal for  *, Pt binning: iterative procedure? First step: make analysis with D0 binning and evaluate roughly the systematic uncertainty per bin i (  syst i rel ) Second step: compute the bin size  j for which:  stat j rel = (√1/N j ) = 0.5  syst i rel One then obtains : (+ require that  j > X  phi j  tot j rel = √( )  syst i rel ~ 1.2  syst i rel in principle this can be iterated Already some work done by Ohan and Vincenzo in the line with what was done by Hao (look at Phi* and Pt resolution). Do not remember if the work converged Here my proposal: First attempt (assuming  syst i rel = 0.01):

Lucia - LAPP Phi* meeting - 3 novembre ** Bin=1 Valore Initial Bin= 2.643e+04 StatRel Error= Nratio= Valore binNEW= ValoreNEW=9831 StatRel Error= Valore binNEW= ValoreNEW=9487 StatRel Error= Valore binNEW= ValoreNEW=9135 StatRel Error= ** Bin=2 Valore Initial Bin= 2.401e+04 StatRel Error= Nratio= Valore binNEW= ValoreNEW=9784 StatRel Error= Valore binNEW= ValoreNEW=9348 StatRel Error= Valore binNEW= ValoreNEW=8911 StatRel Error= ** Bin=3 Valore Initial Bin= 2.15e+04 StatRel Error= Nratio= 2.15 Valore binNEW= ValoreNEW=9728 StatRel Error= Valore binNEW= ValoreNEW=9190 StatRel Error= Valore binNEW= ValoreNEW=8662 StatRel Error= ** Bin=4 Valore Initial Bin= 1.902e+04 StatRel Error= Nratio= Valore binNEW= ValoreNEW=9667 StatRel Error= Valore binNEW= ValoreNEW=9019 StatRel Error= ** Bin=5 Valore Initial Bin= 1.667e+04 StatRel Error= Nratio= Valore binNEW= ValoreNEW=9606 StatRel Error= Valore binNEW= ValoreNEW=8867 StatRel Error= ** Bin=6 Valore Initial Bin= 1.459e+04 StatRel Error= Nratio= Valore binNEW= ValoreNEW=9524 StatRel Error= Valore binNEW= ValoreNEW=8697 StatRel Error= ** Bin=7 Valore Initial Bin= 1.273e+04 StatRel Error= Nratio= Valore binNEW= ValoreNEW=9588 StatRel Error= Valore binNEW= ValoreNEW=8968 StatRel Error= ** Bin=8 Valore Initial Bin= 1.157e+04 StatRel Error=