Harald Fritzsch
Fritzsch in 2011
Born	(1943-02-10)10 February 1943 Zwickau,Germany
Died	16 August 2022(2022-08-16) (aged 79) Munich, Germany
Known for	Quantum chromodynamics SO(10) Fritzsch mass matrices
Awards	UNSW Dirac Medal (2008)
Scientific career
Fields	Physics
Institutions	CERN California Institute of Technology University of Wuppertal University of Bern Ludwig Maximilian University of Munich
Doctoral students	Marcus Hutter[1] Dieter Lüst[1]

Harald Fritzsch (10 February 1943 inZwickau, Germany – 16 August 2022 inMunich) was a German theoreticalphysicist known for his contributions to the theory ofquarks, the development ofquantum chromodynamics and the grand unification of theStandard Model of particle physics.

After completing his education in Zwickau 1961, he became a soldier in theNationale Volksarmee of theGDR. He studied physics inLeipzig from 1963 to 1968, where he completed hisDiplom under Hans-Juergen Treder.^[2] After fleeing toWest Germany, Fritzsch continued his studies inMunich where he finished hisPh.D. under the supervision ofHeinrich Mitter.

In 1970 Fritzsch visited theAspen Center for Physics, where he metMurray Gell-Mann. They started a collaboration, first in Aspen, later at the California Institute of Technology. In 1971 they introduced the concept of thecolour charge quantum number which allowed them in collaboration withWilliam A. Bardeen to explain the decay rate ofpions. In the fall of 1971 Fritzsch and Gell-Mann moved to Geneva in Switzerland, where they worked together atCERN. They proposed agauge theory for thestrong interaction, which now is called Quantum Chromodynamics. In September 1972 they moved back to Caltech. In 1975 Fritzsch published a paper together withPeter Minkowski^[3] in which they proposed the symmetry groupSO(10) as the symmetry of theGrand Unified Theory which has become a standard theory. In 1976 Fritzsch moved to CERN. After working for one year at the University of Wuppertal and the University of Bern, Fritzsch was appointed Professor at theLudwig Maximilian University of Munich in 1980.

Fritzsch worked also on "composite models" of leptons and quarks, mass matrices of quarks and leptons, weak decays of heavy quarks, cosmology and the fundamental constants of physics. He retired in 2008 and died 16 August 2022 inMünchen.^[4]

In 1971 Fritzsch married Brigitte Goralski. They had two children.

• Quarks: The Stuff of Matter (1989,ISBN 978-0-465-06784-8)^[5][6]
• The Creation of Matter: The Universe from Beginning to End (1984,ISBN 978-0-465-01446-0)^[7]
• An Equation That Changed the World: Newton, Einstein, and the Theory of Relativity (1997,ISBN 0-226-26558-7)
• The Curvature of Spacetime: Newton, Einstein, and Gravitation (2005,ISBN 978-0-231-11821-7)
• Elementary Particles: Building Blocks of Matter (2005,ISBN 978-981-256-408-5)
• Escape From Leipzig (2008,ISBN 978-981-279-306-5)
• The Fundamental Constants: A Mystery of Physics (2009,ISBN 978-981-283-432-4 (paperback));ISBN 978-981-281-819-5 hbk.^[8]
• You Are Wrong, Mr Einstein!: Newton, Einstein, Heisenberg and Feynman Discussing Quantum Mechanics (2011,ISBN 978-981-4324-99-1)
• Microcosmos: The World of Elementary Particles: Fictional Discussions between Einstein, Newton, and Gell-Mann (2013,ISBN 978-981-4449-98-4)
• 50 Years of Quarks (with Murray Gell-Mann, 2015,ISBN 978-981-4618-10-6)

• 1943 births
• 2022 deaths
• 20th-century German physicists
• German theoretical physicists
• Academic staff of LMU Munich
• People associated with CERN
• 21st-century German physicists
• Aspen Center for Physics people
• People from Zwickau

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