The Effect of Higher Dimensional QCD Operators on the Spectroscopy of Bottom-Up Holographic Models

Abstract

Within the bottom-up holographic approach to QCD, the highly excited hadrons are identified with the bulk normal modes in the fifth “holographic” dimension. We show that additional states in the same mass range can appear also from taking into consideration the 5D fields dual to higher dimensional QCD operators. The possible effects of these operators have not been taken into account in virtually any phenomenological applications. Using the scalar case as the simplest example, we demonstrate that the additional higher dimensional operators lead to a large degeneracy of highly excited states in the soft wall holographic model, and in the hard wall holographic model, they result in a proliferation of excited states. The considered model can be viewed as the first analytical toy model predicting a one-to-one mapping of the excited meson states to definite QCD operators, to which they prefer to couple.

Vector Quarkonia at the LHC with Jethad: A High-Energy Viewpoint

“…Several potential portals to BSM extensions within the realm of QCD have been proposed. Among others, they include: axions, which were originally postulated to address the strong Charge-Parity (CP) problem [5][6][7][8], non-Abelian dark gauge forces [9,10], quarkyonic matter [11][12][13], and higher-dimensional QCD operators incorporated into the Lagrangian [14][15][16][17]. This wealthy of possibilities provide us with rich opportunities for exploring the frontiers of particle physics and searching for long-awaited signs of physics beyond the SM.…”

“…An incomplete list of possible QCD portals beyond SM is as follows: axions, namely hypothetical elementary particles, originally proposed by R. Peccei and H. Quinn to resolve the strong Charge-Parity (CP) problem [6][7][8][9]; Non-Abelian dark gauge forces [10,11]; quarkyonic matter [12][13][14]; and higher-dimension QCD operators, effectively included in the Lagrangian (see, e.g., Refs. [15][16][17][18] and references therein).…”