Speaker
Description
Search for the large extra dimension gravity at collider energies is considered in transplanckian regime [1-3], i. e. when $\sqrt{\hat{s}}\gg\sqrt{-\hat{t}},M_D$. Here $\hat{s}$ and $\hat{t}$ are the Mandelstam variables of colliding parton-parton system and $M_D$ is the Planck mass scale in the space-time with compactified D extra large dimensions. The main observable of the large extra dimension gravity in transplanckian regime is the high mass ($M_{jj}\sim\sqrt{\hat{s}}\gg M_D$) dijet production with large rapidity separation. In the transplanckian regime the Gribov-Regge limit of QCD ($\sqrt{\hat{s}}\gg\sqrt{-\hat{t}}$) is the main source of the standard model background. The calculation of the QCD background should be done within the next-to-leading logarithmic (NLL) approximation formalism by Lipatov, Fadin, Kuraev and Balitsky (BFKL) [4-7]. In this work the signal of the large extra dimension gravity as well as the NLL BFKL QCD background are estimated for the high luminosity (HL) LHC and future colliders such as FCCpp and CEPCpp.
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