[Rivet] transverse sphericity in rivet

[Hendrik Hoeth]

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

-- 
Journalist: "Can you explain 5 sigma as 99.999something percent?"
Fabiola G.: "Sure, that's 3*10^-7."
(after the CERN Higgs seminar, 4 July 2012)