Re: electron mass

From: Rene Brun <Rene.Brun_at_cern.ch>
Date: Fri, 26 May 2006 20:33:15 +0200 (MEST)


Hi Sue,

TDatabasePDG reads the file $ROOTSYS/etc/pdg_table.txt directly imported from the PDG site.

Rene Brun

On Thu, 25
May 2006, Susan Kasahara wrote:

> 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;
> 0.00051
>
> 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.
> Thanks,
> -Sue
>
Received on Fri May 26 2006 - 20:33:21 MEST

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