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We present a systematic study of the different mechanisms leading to WW pairproduction at the LHC, both in the same-sign and opposite-sign channels, and weemphasize that the former offers much better potential for investigatingnon-resonant W_L W_L scattering. We propose a new kinematic variable to isolatethe W_L W_L scattering component in same-sign WW production at the LHC.Focusing on purely leptonic W decay channels, we show that it considerablyimproves the LHC capabilities to shed light on the electroweak symmetrybreaking mechanism after collecting 100 fb^{-1} of data at sqrt{s} = 14 TeV.The new variable is less effective in the opposite-sign WW channel due todifferent background composition.

The W_L W_L scattering at the LHC: improving the selection criteria