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Subsections

Central total jet mass


Definition of the observable

One can consider all particles in a central rapidity region $ {\cal C}$, and determine the transverse thrust axis $ \vec{n}_{T,{\cal C}}$ as described in eq. (2). One then separates the event into an up region $ {\cal C}_U$ consisting of all particles in $ {\cal C}$ with $ \vec
p_\perp \cdot \vec n_{T,{\cal C}} > 0$ and a down region $ {\cal C}_D$ with all particles in $ {\cal C}$ with $ \vec p_\perp \cdot \vec n_{T,{\cal C}} < 0$. One then constructs the normalised sum of the invariant masses of the two regions

$\displaystyle \rho_{X,{\cal C}} = \frac{1}{Q_{\perp,{\cal C}}^2}\left(\sum_{i\in {\cal C}_X} p_{i}\right)^2\,,\qquad\quad X=U,D\,,$ (14)

where $ Q_{\perp,{\cal C}}$ is the total transverse energy in $ {\cal C}$ as defined in eq. (6). One then looks at the sum of the normalised invariant masses

$\displaystyle \rho_{S,{\cal C}} = \rho_{U,{\cal C}}+\rho_{D,{\cal C}}\,.$ (15)

Born event used for the analysis

The hard scale (Q) is taken to be the Born partonic center-of-mass energy.
Rapidity of the center of mass of the outgoing pair: 0.000
Cosine of the angle between outgoing jet and beam (in the partonic CM frame): 0.200

Elementary tests on the observable

Test result
check number of jets T
all legs positive T
globalness F

Since this observable is non-global, the analysis has not been continued. Since this observable is discontinuosly global, multiple emission effects have not been computed.

Collection of automatically generated results

mt_HH_cut.tar.gz collects all files produced automatically by Caesar.
next up previous
Next: Central total jet mass Up: Observables in hadronic dijet Previous: Cone thrust minor with
Giulia Zanderighi 2005-05-27