Changes between Version 2 and Version 3 of TOPMassMeasurmentExample

Timestamp:

Feb 4, 2014, 11:56:07 AM (10 years ago)

Author:

Pierre

Comment:

--

TOPMassMeasurmentExample

@@ -291 +291 @@
        ||        || log_level        || Indicates how much information as to be kept from the run. The two physical level are '''weights''' and '''permutations'''. '''full'' will return the log associated to each run' || 
        ||        || nwa              || The integral on the invariant mass of particles with width below this threshold will be done in Narrow-width approximation (i.e. the mass of that particles will be kept fixed during the computation and the integral on the invariant mass assumed to correspond to the Breit-Wigner Shape. The default correspond to use this approximation ONLY for the Higgs. ||
-       ||        || isr              || -> Pierre ||
+       ||        || isr              ||  isr=0: no correction, except if all ME final-state particles are reconstructed
+in the final state: in that case, the pT of the reconstructed particles
+may not be balanced and one cannot ignore the effects from ISR. The
+phase-space integration is done under the assumption that, point-by-point
+in the phase-space, the parton-level final state has a pT balancing
+pT(ISR), with pT(ISR) set to minus the transverse momentum of the
+reconstructed objects in the LHCO file. 
+isr=1: point by point in the phase-space,  the parton-level final state has a pT
+balancing pT(ISR), with pT(ISR) set to the experimental value read from
+the lhco file [as -pT(visible)-pT(missing)]
+isr=2: same as isr=1, except that the value of the weight is translated into
+a frame where the hard system has no pT.
+isr=3: only relevant if all final state ME particle are reconstructed.
+   pT of ISR is assumed to be unconstrained (can be anything)
+   -> the dimension of the phase-space integration is augmented by 2,
+   since we also integrate over the pT of the parton-level final state.  ||
        ||        || inputfile        || The path of the input_file in lhco (or lhco.gz) to use to get the events.||
        ||        ||                  ||           ||