Dalitz plot

Article summary

is present as an intermediate state in this three-body decay, which then decays to particles 1 and 2. The orange line shows the position of accumulation of events in case another spin-0 resonance is present, decaying to particles 1 and 3.|306x306px experiment at CERN. Clear resonances K^{*0} (vertical region of enhancement) and \phi (horizontal enhancement) can be seen. Distribution of events around resonant regions is not uniform due to spin 1 of the resonances, and interference between the resonant and non-resonant processes.|306x306px The Dalitz plot is a two-dimensional plot often used in particle physics to represent the relative frequency of various (kinematically distinct) manners in which the products of certain (otherwise similar) three-body decays may move apart. The phase-space of a decay of a pseudoscalar into three spin-0 particles can be completely described using two variables. In a traditional Dalitz plot, the axes of the plot are the squares of the invariant masses of two pairs of the decay products. (For example, if particle A decays to particles 1, 2, and 3, a Dalitz plot for this decay could plot m 2 12 on the x-axis and m 2 23 on the y-axis.) If there are no angular correlations between the decay products then the distribution of these variables is flat. However symmetries may impose certain restrictions on the distribution.…

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