class AliTOFT0v1: public TObject

 This is a TTask that made the calculation of the Time zero using TOF.
 Description: The algorithm used to calculate the time zero of interaction
 using TOF detector is the following.
 We select in the ESD some "primary" particles - or tracks in the following -
 that strike the TOF detector (the larger part are pions, kaons or protons).
 We choose a set of 10 selected tracks, for each track You have the length
 of the track when the TOF is reached,
 the momentum and the time of flight
 given by the TOF detector.
 Let consider now only one set of 10 tracks (the algorithm is the same for all sets).
 Assuming the (mass) hypothesis that each track can be AUT a pion, AUT a kaon, AUT a proton,
 we consider all the 3 at 10 possible cases.
 For each track in each (mass) configuration
 (a configuration can be e.g. pion/pion/kaon/proton/pion/proton/kaon/kaon/pion/pion)
 we calculate the time zero (we know in fact the velocity of the track after
 the assumption about its mass, the time of flight given by the TOF, and the
 corresponding path travelled till the TOF detector). Then for each mass configuration we have
 10 time zero and we can calculate the ChiSquare for the current configuration using the
 weighted mean over all 10 time zero.
 We call the best assignment the mass configuration that gives the minimum value of the ChiSquare.
 We plot the weighted mean over all 10 time zero for the best assignment,
 the ChiSquare for the best assignment and the corresponding confidence level.
 The strong assumption is the MC selection of primary particles. It will be introduced
 in the future also some more realistic simulation about this point.
 Use case:
 root [0] AliTOFT0v1 * tzero = new AliTOFT0v1("galice.root")
 Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
 root [1] tzero->ExecuteTask()
 root [2] tzero->ExecuteTask("tim")
             // available parameters:
             tim - print benchmarking information
             all - print usefull informations about the number of misidentified tracks
                   and a comparison about the true configuration (known from MC) and the best
                   assignment
 Different Selections for pp and Pb-Pb: Momentum Range, Max Time, # pions
-- Author: F. Pierella
-- Mod By Silvia Arcelli, Francesco Noferini, Barbara Guerzoni
-- AliTOFT0v1 contains code speed up provided by Jens Wiechula (look-up table
   for Power3)