Contents

# Contents

## Idea

In QCD a bound state of quarks via the strong nuclear force.

Binding two quarks: meson

Binding three quarks: baryon.

## Properties

### Computation via lattice QCD

Comparison of light hadron masses as seen in accelertator experiment and in lattice QCD-computer simulation (from Fodor-Hoelbling 12)

### Conceptualization and computation in AdS/QCD

In the Witten-Sakai-Sugimoto model for strongly coupled QCD via an intersecting D-brane model, the hadrons in QCD correspond to string-theoretic-phenomena in an ambient bulk field theory on an approximately anti de Sitter spacetime:

1. the mesons (bound states of 2 quarks) correspond to open strings in the bulk, whose two endpoints on the asymptotic boundary correspond to the two quarks;

2. baryons (bound states of $N_c$ quarks) appear in two different but equivalent (Sugimoto 16, 15.4.1) guises:

1. as wrapped D4-branes with $N_c$ open strings connecting them to the D8-brane

For review see Sugimoto 16, also Rebhan 14, around (18).

graphics grabbed from Sugimoto 16

This produces baryon mass spectra with moderate quantitative agreement with experiment (HSSY 07):

graphics grabbed from Sugimoto 16

## References

### Experiment

Observations at LHC:

• Maria Vasileiou on behalf of the ALICE Collaboration, Measurement of the Hadronic Resonance Production with ALICE at the CERN LHC, Universe 2019, 5(1), 6 (doi:10.3390/universe5010006)

### In lattice QCD

Computation of the mass of hadrons using lattice QCD (see also confinement and mass gap problem) is discussed in

• S. Durr, Z. Fodor, J. Frison, C. Hoelbling, R. Hoffmann, S.D. Katz, S. Krieg, T. Kurth, L. Lellouch, T. Lippert, K.K. Szabo, G. Vulvert,

Ab-initio Determination of Light Hadron Masses,

Science 322:1224-1227,2008 (arXiv:0906.3599)

conclusion on p. 4:

our study strongly suggests that QCD is the theory of the strong interaction, at low energies as well

• Zoltan Fodor, Christian Hoelbling, Light Hadron Masses from Lattice QCD, Rev. Mod. Phys. 84, 449, (arXiv:1203.4789)

• S. Aoki et. al. Review of lattice results concerning low-energy particle physics (arXiv:1607.00299)

### In Witten-Sakai-Sugimoto model for AdS-QCD

Review

• Anton Rebhan, The Witten-Sakai-Sugimoto model: A brief review and some recent results, 3rd International Conference on New Frontiers in Physics, Kolymbari, Crete, 2014 (arXiv:1410.8858)

• Shigeki Sugimoto, Skyrmion and String theory, chapter 15 in M. Rho, Ismail Zahed (eds.) The Multifaceted Skyrmion, World Scientific 2016 (doi:10.1142/9710)

Last revised on December 28, 2018 at 08:04:55. See the history of this page for a list of all contributions to it.