The scheme, recom=4

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$\displaystyle E_{t(kl)}$	$\textstyle =$	$\displaystyle E_{tk}+E_{tl},$
$\displaystyle \eta_{kl}$	$\textstyle =$	$\displaystyle \frac{E_{tk}\eta_k+E_{tl}\eta_l}{E_{t(kl)}},$
$\displaystyle \phi_{kl}$	$\textstyle =$	$\displaystyle \frac{E_{tk}\phi_k+E_{tl}\phi_l}{E_{t(kl)}}.$	(13)

For massless input objects this definition is identical to the

scheme (section 2.5.2). It differs solely in the way it deals with massive input objects. If massive objects are input, the

scheme uses their transverse momentum, whereas the

scheme uses the transverse energy $E\sin\theta$ . This can have a significant effect for low

jets, particularly for steeply falling distributions close to a cut-off value. All combined objects are massless in both cases.

Jonathan Couchman 2002-10-02