Hi, I have attached a fixed version of the DefaultParticlePropertyProvider
class. Until a new version of JAS is released you can use it as follows:
1) Rename it to something like LCDParticlePropertyProvider (change the file
name and the internal name).
2) Compile it and put it in your CLASSPATH
3) Insert a line somewhere in the initialization phase of your code that
says:
ParticleProperties.setParticlePropertyProvider(new
LCDParticlePropertyProvider());
Note that the new version returns masses in Gev, not Mev as the old one did.
Please let me know if you have problems, or if you find more mistakes.
Tony
----- Original Message -----
From: David Gerdes <[log in to unmask]>
To: Tony Johnson <[log in to unmask]>
Cc: David Gerdes <[log in to unmask]>; Deborah Weber
<[log in to unmask]>; Gene Guillian <[log in to unmask]>
Sent: Wednesday, June 16, 1999 12:06 PM
Subject: bug in ParticleType for u, d quarks?
> Hi Tony,
>
> I suspect a bug in the JAS ParticleType class in reporting information
> for
> u and d quarks. If you look at any of the ttbar events on the server at
> zeno.physics.lsa.umich.edu and show the MC tree, you'll notice that the
> charge info is consistently wrong for W decays to u dbar / ubar d.
> The decays always appear as W+ -> ubar d and W- -> u dbar, whereas it
> should be the other way around.
>
> The PDG convention is d = 1, u = 2.
>
> Can you take a look and see if JAS is in fact getting things backwards?
>
> Cheers,
>
> Dave
>
> --------------------------------------
> David Gerdes, University of Michigan
> (734) 647-3807 / (734) 936-1817 FAX
> [log in to unmask]
> http://umaxp1.physics.lsa.umich.edu/~gerdes/
>
>
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