[Rivet] transverse sphericity in rivet

[Tobias Hülsing]

Hi!

Thanks for the help.
I think that doesn't solve the problem as I don't know how to set the 
z-component of the momentum to zero. And I if I don't do it, the 
eigenvalues will differ.
Where do I find a description of the sphericity projection?

Cheers,

Toby
On 28.07.2012 21:27, Hendrik Hoeth wrote:
> Moin Tobias,
>
> Sphericity is indeed different from transverse Sphericity. The
> definition of Sphericity is 3/2*(lambda2+lambda3), and I don't think we
> even have the transverse Sphericity in Rivet. If you want to calculate
> the transverse Sphericity you can access the lambdas of the Sphericity
> projection with lambda1(), lambda2() and lambda3(). Then calculate
>
>>    ST = 2 * lambda1 / (lambda1 + lambda2);
> and see if it give you the right result (should do). If that works, I'll
> add the transverse Sphericity to the Sphericity projection.
>
> Cheers,
>
>      Hendrik
>

-- 
Tobias Hülsing
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