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We provide numerical evidence for composite fermion pairing in quantum Hallbilayer systems at filling $\nu=1/2 + 1/2$ for intermediate spacing between thelayers. We identify the phase as $p_x + i p_y$ pairing, and construct highaccuracy trial wavefunctions to describe the groundstate on the sphere. Forlarge distances between the layers, and for finite systems, a competing "Hund'srule" state, or composite fermion liquid, prevails for certain system sizes. Weargue that for larger systems, the pairing phase will persist to larger layerspacing.

Paired composite fermion phase of quantum Hall bilayers at \nu = 1/2 + 1/2