electron mass

From: Susan Kasahara <schubert_at_hep.umn.edu>
Date: Thu, 25 May 2006 21:12:23 -0500

Hi roottalk,
I use TParticlePDG's extracted from TDatabasePDG to determine particle quantities,
and I've found that the mass of the electron has only two significant digits:

root[0] TParticlePDG* part = TDatabasePDG::Instance()->GetParticle(11);
root[1] double mass = part->Mass();
root[2] cout << mass << endl;


On the other hand, Geant3 stores the electron mass as 0.00051099906 Why is there the lack of precision in the TParticlePDG value? Can this be changed?
I'm using root v5.10/00d on linux.
-Sue Received on Fri May 26 2006 - 04:12:48 MEST

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