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m(pi+pi-) invariant mass from 4pion event in DPM generator [message #13240] Wed, 21 March 2012 11:35
donghee is currently offline  donghee
Messages: 385
Registered: January 2009
Location: Germnay
first-grade participant
From: *
Dear DPM developers,

I'm wondering that DPM can have some virtual and resonance like peak in m(pi+pi-) mass distribution.
4 pions are selected from DPM generator and make a plot of 2pion mass distribution, which is combination of 1 positive and 1 negative with pion mass hypothesis.( see page 5 in attached pdf file).

The behaviour looks quite(definitely) unphysical.
How can be possible those peaks?
Why do they move around half of beam momentum (half of cms)?
Can you explain that?

Best regard,

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