Electroweak double-logs at small x

We investigate enhanced EW corrections to inclusive hard processes in the TeV energy region with emphasis on the small-xsituation, in which the hard scale Q is significantly smaller than the available energy (s)^1/2 ≡ Q/x. We first propose and justify a general factorization formula in which the (double-log) EW form factor at scale Q² is factorized from EW parton distribution functions, which satisfy evolution equations of DGLAP type. We then investigate the small-x behavior of the EW parton distributions including the novel ones for non-vanishing t-channel weak isospin T and we compare it with a BFKL-type approach. In either approach we find that large small-x corrections of order α_w log x log Q²/M² (M being the EW symmetry breaking scale) are present only for T = 2 and not for T = 1, thus affecting only transverse WW interactions. We finally note that the T = 2 component is turned off in flavour-blind measurements at LHC, which therefore feel just the EW form factor at scale Q².