TY - JOUR

T1 - The Effect of Higher Dimensional QCD Operators on the Spectroscopy of Bottom-Up Holographic Models

AU - Афонин, Сергей Сергеевич

N1 - Publisher Copyright: © 2021 by the author. Licensee MDPI, Basel, Switzerland.

PY - 2021/4/15

Y1 - 2021/4/15

N2 - 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.

AB - 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.

KW - AdS/QCD

KW - Hadron spectroscopy

KW - Holographic approach

KW - AdS

KW - QCD

KW - hadron spectroscopy

KW - holographic approach

UR - http://www.scopus.com/inward/record.url?scp=85108140209&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/25f8776f-8d67-3d77-b442-a7b6880e4344/

U2 - 10.3390/universe7040102

DO - 10.3390/universe7040102

M3 - Article

VL - 7

JO - Universe

JF - Universe

SN - 2218-1997

IS - 4

M1 - 102

ER -