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Particle Physics in the LHC Era$
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Giles Barr, Robin Devenish, Roman Walczak, and Tony Weidberg

Print publication date: 2016

Print ISBN-13: 9780198748557

Published to Oxford Scholarship Online: March 2016

DOI: 10.1093/acprof:oso/9780198748557.001.0001

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Static quark model

Static quark model

(p.115) 5 Static quark model
Particle Physics in the LHC Era

G. Barr

R. Devenish

R. Walczak

T. Weidberg

Oxford University Press

This chapter introduces the quark model of hadrons, starting with a short section on how to combine two and three spin-half particle states. The quark model is explained with reference to the hadrons formed from the light quarks (u, d, s). It is explained that even though these quarks have different masses, an approximate symmetry—known as flavour symmetry—is used to make predictions. The complete spin–flavour–colour hadronic wavefunction for a proton is described. The remaining sections cover the heavy quarks (c, b, t), for which an extended flavour symmetry is not useful. The heavy-quark systems of charmonium (ccˉ) and bottomonium (bbˉ) are described. These systems have states below the threshold for producing charm and beauty meson pairs and show clear analogies with positronium (e+e− bound system). They provide key experimental information in support of quantum chromodynamics and the concept of confinement).

Keywords:   quark model, light quark, heavy quark, flavour symmetry, charmonium, bottomonium, confinement

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