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### Description

Pomeron was introduced in the framework of the phenomenological Regge theory.

It governs the high-energy asymptotics of various hadronic processes and the small-$x$ behavior of $F_1$ in particular.

The best-known contribution to the QCD Pomeron comes from the BFKL equation which

sums Leading Logarithmic (LL) contributions i.e. the

single-logarithmic (SL) contributions $\sim (\alpha_s \ln (1/x))^n$

multiplied by the overall factor $1/x$.

The high-energy asymptotics of this resummation is

known as the BFKL Pomeron. It predicts that small-$x$ $F_1 \sim x^{- (1 + \Delta)}$, where $\Delta$ is the intercept of the BFKL Pomeron.

In contrast, we calculate $F_1$ in the Double-Logarithmic approximation (DLA),

accounting for contributions $\sim (\alpha_s
\ln^2 (1/x))^n$ as well as double-logs of $Q^2$. Such terms are not accompanied by the overall factor

$s$, so their contribution to asymptotics of $F_1$ is $\sim
x^{-\Delta_{DL}}$ without the factor $x^{-1}$. It looks negligibly small compared to the

BFKL exponent $1 + \Delta$. By this reason the DL contribution to Pomeron was offhandedly ignored by the HEP

community. However, we demonstrate that the intercept $\Delta_{DL}$ proves to be so

large that its value compensates for the lack of $x^{-1}$, which

makes the DL Pomeron and BFKL Pomeron be equally important.

It means that DL Pomeron should participate in theoretical analysis

of all HEP results where the BFKL Pomeron

has been involved.