The angular scheme, angle = 1

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$\displaystyle d_{kB}$	$\textstyle =$	$\displaystyle 2E^2_k(1-cos\theta_{kB}),$
$\displaystyle d_{kl}$	$\textstyle =$	$\displaystyle 2 \min(E^2_k,E^2_l)(1-cos\theta_{kl}).$	(6)

This definition was originally proposed for jets in DIS [4] (where the $K_\perp~$ algorithm should be implemented in the Breit frame).

Jonathan Couchman 2002-10-02