Speaker
Description
Historically, theoretical and experimental efforts in Deep Inelastic Scattering have focused on the structure functions $F_1$, $F_2$, and $F_3$, largely neglecting $F_4$ and $F_5$. These structure functions are kinematically suppressed by the square of the lepton mass and are therefore relevant primarily in processes involving heavy leptons, such as the tau. However, the proposed SHiP experiment at CERN and recent high-energy tau neutrino observations by IceCube have renewed interest in these functions, creating a demand for precise theoretical predictions.In this work, we present a comprehensive analysis of the heavy-quark contributions to $F_4$ and $F_5$ at next-to-leading order in perturbative QCD. We utilize the ACOT scheme, a variable flavor number scheme that naturally handles heavy-quark mass effects and the resummation of quasi-collinear logarithms. We extend previous ACOT calculations for the standard structure functions to include $F_4$ and $F_5$. These results provide a robust framework for interpreting future experimental data and offer valuable insights into gluon and strange quark distributions at low Bjorken-$x$.
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