Where Can I Find References on Composite Quarks and Leptons?

  • Context: Graduate 
  • Thread starter Thread starter francesco85
  • Start date Start date
  • Tags Tags
    Composite
Click For Summary

Discussion Overview

The discussion centers on the search for references regarding the concept of quarks and leptons as composite objects, exploring both theoretical frameworks and experimental evidence related to this idea. Participants inquire about literature that addresses the compositeness of these particles, as well as its implications for current theories in particle physics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Francesco requests modern references for studying quarks and leptons as composite objects, including papers, books, and reviews.
  • Some participants assert that current theory posits quarks and leptons as fundamental particles, not composite.
  • There is a suggestion that extensions to the standard model might consider quarks and leptons as composite, potentially explaining phenomena like the flavor puzzle and electroweak symmetry breaking.
  • A reference to an older survey titled "Preons: Models of Leptons, Quarks and Gauge Bosons As Composite Objects" by I. D'Souza et al. (1992) is provided, with a note that the topic is speculative and lacks experimental support.
  • Francesco seeks clarification on what is meant by "unsupported" in terms of experimental evidence for compositeness, asking whether it refers to exclusion by experiments or simply a lack of verification.
  • Additional references are shared, including TASI lectures by Chivukula and summaries of experimental search exclusions from the Particle Data Group (PDG) related to vector composites and quark/lepton composites.

Areas of Agreement / Disagreement

Participants express differing views on the status of quarks and leptons as composite versus fundamental particles. Some assert the current theoretical consensus, while others propose alternative models and seek further exploration of the topic.

Contextual Notes

The discussion highlights the speculative nature of the compositeness of quarks and leptons, with references to experimental exclusions and the need for further verification. Limitations in current understanding and the dependence on theoretical frameworks are noted.

francesco85
Messages
62
Reaction score
0
Hello everybody; does anyone know a good reference (possibly modern) where one can study quarks and leptons (as well as gauge bosons) as composite objects? By reference I mean papers, books, reviews and every other thing you might find useful :)

Francesco
 
Physics news on Phys.org
Current theory says quarks and leptons are not composite.
 
mathman said:
Current theory says quarks and leptons are not composite.

I know that standard model assumes that all the particles described in it are fundamental; Aren't there extensions that assumes the compositeness of quarks and leptons? Why couldn't this explain the flavor puzzle for example? Isn't there any link with electroweak symmetry breaking? Why is it excluded? What about the Electroweak Precison Tests? Can you give a reference, please?
 
Last edited:
Here's a survey, although out of date. "Preons: Models of Leptons, Quarks and Gauge Bosons As Composite Objects", a book by I. D'Souza et al (1992).

To repeat Mathman's comment, this is a highly speculative topic unsupported by experiment.
 
Bill_K said:
Here's a survey, although out of date. "Preons: Models of Leptons, Quarks and Gauge Bosons As Composite Objects", a book by I. D'Souza et al (1992).

To repeat Mathman's comment, this is a highly speculative topic unsupported by experiment.

Thank you very much for the reference.
For the sake of clarity, what do you mean by "unsupported"? Experimentally excluded? If so what experiments exclude the compositeness? Or simply experimentally not verified (yet)?
Thanks in advance,
Francesco
 
The TASI lectures by Chivukula http://arxiv.org/abs/hep-ph/0011264v1 would be someplace to start for some theory. Experimental search exclusions are summarized by PDG at

http://pdglive.lbl.gov/popupblockdata.brl?nodein=S057DSB&inscript=Y&exp=Y&fsizein=1

for vector composites and

http://pdglive.lbl.gov/Rsummary.brl?nodein=S054&exp=Y

for quark/lepton composites. You can click around there to find references to the original papers. Some recent publications by CMS are here:

http://inspirehep.net/search?ln=en&...n_search=Search&sf=&so=a&rm=&rg=10&sc=0&of=hb
 
Last edited by a moderator:
Thank you very much, to everybody; I will have a look to the references you have given!

f.
 

Similar threads

Undergrad Current theory of composite quarks and leptons
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad New Lepton Universality Data To Be Announced Tuesday, 18 October 2021
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Compositeness Limits -- Have We Reached Rock Bottom?
  • · Replies 4 ·
Replies
4
Views
2K
High School Where Can I Find The New Daya Bay Results?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Glueballs Observed For The First Time
  • · Replies 10 ·
Replies
10
Views
5K
Undergrad The standard model from loop quantum gravity via spinors octonions
  • · Replies 26 ·
Replies
26
Views
6K
High School Preon quark models excluded by LHC
  • · Replies 7 ·
Replies
7
Views
3K
Graduate The "electroweak eta meson"
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Where can I find vertex corrections for leptons at different momenta?
  • · Replies 6 ·
Replies
6
Views
5K
Graduate Three generations of Fermions from octonions Clifford alegbras
  • · Replies 61 ·
3
Replies
61
Views
10K