is a Standard Model particle with (u, d, b) quark content. What are the electric charge, baryon number and lepton number of this particle? Is this the only particle expected to exist with this quark content? Justify your answer

I know that the overall charge is 0, baryon number is 1. But what is the lepton number? ( The answer is 0) . Why is it 0? Why is it not the only expected particle with this quark content?


closed as off-topic by John Rennie, DavePhD, Kyle Kanos, David Z May 7 '14 at 18:26

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See our meta site for more guidance on how to edit your question to make it better" – John Rennie, DavePhD, Kyle Kanos, David Z
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ The leptons are the $e$, $\mu$, $\tau$, and the neutrinos. How many leptons and antileptons are there in a particle made of $u$, $d$, $b$ quarks? $\endgroup$ – rob May 7 '14 at 16:56
  • $\begingroup$ how do I know which particle do these quarks construct? $\endgroup$ – user43249 May 7 '14 at 16:58
  • $\begingroup$ Maybe this page, this page, this page and this page will help you $\endgroup$ – Gigi Butbaia May 7 '14 at 17:09
  • $\begingroup$ Take the lepton numbers of the u, d and b quarks and add them together and you get the lepton number of the particle(s) they make up. Re your last question, in particle physics different excited states of the same three quarks are regarded as different particles. $\endgroup$ – John Rennie May 7 '14 at 17:09