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[SOLVED]generate rho0->pi+pi- but found the rho0 has no width [message #19315] Thu, 02 June 2016 15:15 Go to next message
Xinying Song is currently offline  Xinying Song
Messages: 7
Registered: January 2016
Location: Germany
occasional visitor
From: *ikp.kfa-juelich.de
when I simulate the process g + P-->P+ eta', eta'->rho0 +gamma, rho0--> pi+ pi-, but found that the width of rho0 particle is 0. the eta' does not have width either.

I don't know why.

The rho0 mass pic mpipi.eps and the generating script are in the attachment.
  • Attachment: sim_etap_grho.C
    (Size: 3.73KB, Downloaded 151 times)
  • Attachment: mpipi.eps
    (Size: 7.91KB, Downloaded 116 times)

[Updated on: Fri, 03 June 2016 15:53]

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Re: generate rho0->pi+pi- but found the rho0 has no width [message #19318 is a reply to message #19315] Fri, 03 June 2016 15:04 Go to previous messageGo to next message
Ingo Froehlich is currently offline  Ingo Froehlich
Messages: 167
Registered: March 2004
Location: IKF - Frankfurt
first-grade participant
From: *dip0.t-ipconnect.de
This is because the decay eta' -> rho0 + gamma has no model included, one can see this in the printout:

2. eta' --> rho0 + photon
Interaction model(s):
[eta'_fixed_g_rho0] Fixed product masses {/}
[eta'_genbod_g_rho0] Pluto build-in genbod {/genbod}

I don't know if this is the correct physics model, but a decay with a simple Breit-Wigner can done by adding these lines:

PHadronDecayM1N *newmodel =
new PHadronDecayM1N("rho_model@eta'_to_rho0_g", "Patched rho model", -1);
makeDistributionManager()->Add(newmodel);


--
Ingo Froehlich
IKF - University of Frankfurt
069-798-47027, FAX: -47024
Re: generate rho0->pi+pi- but found the rho0 has no width [message #19319 is a reply to message #19318] Fri, 03 June 2016 15:51 Go to previous message
Xinying Song is currently offline  Xinying Song
Messages: 7
Registered: January 2016
Location: Germany
occasional visitor
From: *ikp.kfa-juelich.de
Thanks very much! it's solved.
Previous Topic: the simulation of ep to e delta(1910)+, delta(1910)+ to Sigma(1385)^0 K+
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