Multiquark Hadrons

A comprehensive summary of current research into multiquark hadrons, describing them in terms of constituent quarks, gluons and compact diquarks.

Ahmed Ali (Author), Luciano Maiani (Author), Antonio D. Polosa (Author)

9781107171589, Cambridge University Press

Hardback, published 25 April 2019

242 pages, 87 b/w illus. 34 tables
25.2 x 17.8 x 1.6 cm, 0.65 kg

This work summarises the salient features of current and planned experiments into multiquark hadrons, describing various inroads to accommodate them within a theoretical framework. At a pedagogical level, authors review the salient aspects of quantum chromodynamics (QCD), the theory of strong interactions, which has been brought to the fore by high-energy physics experiments over recent decades. Compact diquarks as building blocks of a new spectroscopy are presented and confronted with alternative explanations of the XYZ resonances. Ways to distinguish among theoretical alternatives are illustrated, to be tested with the help of high luminosity LHC, electron-positron colliders, and the proposed Tera-Z colliders. Non-perturbative treatments of multiquark hadrons, such as large N expansion, lattice QCD simulations, and predictions about doubly heavy multiquarks are reviewed in considerable detail. With a broad appeal across high-energy physics, this work is pertinent to researchers focused on experiments, phenomenology or lattice QCD.

Preface
1. Introduction
2. XYZ and Pc phenomenology
3. Color forces and constituent quark model
4. Hadron molecules
5. Light scalar mesons
6. Mass formulae for P-wave, qq mesons
7. Compact tetraquarks
8. The Xu Xd puzzle
9. Y states as P-wave tetraquarks
10. Pentaquark models
11. Tetraquarks in large N QCD
12. QCD sum rules and lattice QCD
13. Phenomenology of beauty quark exotics
14. Hidden heavy avour tetraquarks – overview
15. Tetraquarks with double heavy quarks
16. Outlook
Appendix A. Low energy p – n scattering amplitude
Appendix B. Wigner's 6-j symbols
References
Index.

Subject Areas: Applied physics [PHV], Quantum physics [quantum mechanics & quantum field theory PHQ], Particle & high-energy physics [PHP]