Nicola Cabibbo

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Nicola Cabibbo
Nicola Cabibbo.jpg
Born (1935-04-10)10 April 1935
Rome, Italy
Died 16 August 2010(2010-08-16) (aged 75)
Rome, Italy
Nationality Italian
Fields Particle physics
Institutions Italian National Institute of Nuclear Physics
Pontifical Academy of Sciences
Known for Cabibbo angle
Notable awards Sakurai Prize (1989)
Matteucci Medal (2002)
Pomeranchuk Prize (2009)
P.A.M. Dirac Medal (2010)
Benjamin Franklin Medal (2011, posthumous)

Nicola Cabibbo (10 April 1935 – 16 August 2010[1]) was an Italian physicist, best known for his work on the weak interaction. He was also the president of the Italian National Institute of Nuclear Physics from 1983 to 1992, and from 1993 until his death he was the president of the Pontifical Academy of Sciences.[2] He was born in Rome.


The Cabibbo angle represents the rotation of the mass eigenstate vector space formed by the mass eigenstates \scriptstyle{| d \rangle , \ | s \rangle} into the weak eigenstate vector space formed by the weak eigenstates \scriptstyle{| d^\prime \rangle , \ | s^\prime \rangle}. The rotation angle is θC = 13.04°.

Cabibbo's major work on the weak interaction originated from a need to explain two observed phenomena:

Cabibbo addressed these issues, following Murray Gell-Mann and Maurice Lévy, by postulating weak universality, which involves a similarity in the weak interaction coupling strength between different generations of particles. He addressed the second issue with a mixing angle θC (now[3] called the Cabibbo angle), between the down and strange quarks. Modern measurements show that θC = 13.04°.

Before the discovery of the third generation of quarks, this work was extended by Makoto Kobayashi and Toshihide Maskawa to the Cabibbo–Kobayashi–Maskawa matrix. In 2008, Kobayashi and Maskawa shared one half of the Nobel Prize in Physics for their work. Some physicists had bitter feelings that the Nobel Prize committee failed to reward Gell-Mann, Levy, and possibly Cabibbo for their part.[4][5] Asked for a reaction on the prize, Cabibbo preferred to give no comment. According to sources close to him, however, he was embittered.[6]

Later, Cabibbo researched applications of supercomputers to address problems in modern physics with the experiments APE 100 and APE 1000.

Cabibbo supported attempts to rehabilitate executed Italian philosopher Giordano Bruno, citing the apologies on Galileo Galilei as a possible model to correct the historical wrongs done by the Church.[7]

After his death in 2011, the Franklin Institute awarded him with the Benjamin Franklin Medal in Physics.[8]


He died from respiratory problems in a Rome hospital on August 16, 2010 at the age of 75.


  1. ^ "Morto il fisico Cabibbo Gli fu negato il Nobel". Corriere della Sera (in Italian). 16 August 2010. Retrieved 2010-08-16. 
  2. ^ Maiani, Luciano (2010). "Obituary: Nicola Cabibbo (1935–2010)". Nature 467 (7313): 284. doi:10.1038/467284a. PMID 20844530. 
  3. ^ Introduced by Murray Gell-Mann and Maurice Lévy, in M. Gell-Mann, M. Lévy (1960). "The Axial Vector Current in Beta Decay". Il Nuovo Cimento 16 (4): 705–726. doi:10.1007/BF02859738. and referenced by Cabbibo in his paper
  4. ^ 闫同民 (2013). "与2008年诺贝尔物理奖失之交臂的物理学家". 物理双月刊 35. pp. 354–357. 
  5. ^ Valerie Jamieson (7 October 2008). "Physics Nobel snubs key researcher". New Scientist. Retrieved 2009-11-06. 
  6. ^ "Nobel, l'amarezza dei fisici italiani" (in Italian). Corriere della Sera. 7 October 2008. Retrieved 2009-11-06. 
  7. ^ "Un scientifique évoque la réhabilitation d'un théologien brûlé pour hérésie" (in French). 
  8. ^ "Benjamin Franklin Medal in Physics". Franklin Institute. 2011. Retrieved December 23, 2011. 

External links[edit]

Catholic Church titles
Preceded by
Giovanni Battista Marini Bettòlo Marconi
President of the Pontifical Academy of Sciences
6 April 1993 – 16 August 2010
Succeeded by
Werner Arber