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The $\Delta R$ scheme, angle = 2


$\displaystyle d_{kB}$ $\textstyle =$ $\displaystyle p_{tk}^2,$  
$\displaystyle d_{kl}$ $\textstyle =$ $\displaystyle \min(p^2_{tk},p^2_{tl})R^2_{kl},$ (7)

where
\begin{displaymath} R^2_{kl}=(\eta_k-\eta_l)^2+(\phi_k-\phi_l)^2. \end{displaymath} (8)

This definition corresponds to that used in cone algorithms, and is the most common choice for hadron-hadron collisions.
Jonathan Couchman 2002-10-02