PPT Slide

a represents the signal fraction of the Dalitz Plot events

and it is bounded to move inside a Gaussian centered

on the measured value ?a and with width s(?a ).

AT ( j ) is the theoretical amplitude evaluated for the

event j =(m212,m213). It is the sum of the amplitudes

of all the modes (resonant and non resonant):

The Dalitz Plot fit formalism.

Ds+ p1- p2+p3+

Normalized by f0:

f(f0) = 0 fixed

a(f0) = 1 fixed

Identical particles:

amplitudes must be symmetric for the exchange of m212,m213

(Bose - Einstein)

We performed a continuous maximum Likelihood fit :

For every event “j ” we can define the probability Pj :

Where:

Where NR is the number of the modes which the decay

could proceed through, aj are the coefficients of the

normalized amplitudes Aj , and f j the associated

phases. aj and f j are free parameters of the fit.

Amplitude for Non Resonant channel is not depend

on energy and it is a constant

ANR = 1

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