What is a Feynm an diagram? Draw the Feynman diagram for n + p = n + p + pi^0 Wh

Question

What is a Feynm an diagram? Draw the Feynman diagram for n + p = n + p + pi^0 What are the 4 fundamental forces? Which two of them can be described by a single theory? Identify the conserved quantities(baryon # (B), lepton #L_e, L_mu, L_tuy, charge, strangeness (S) in following processes rightarrow lambda^0 + mu + v_mu K^0 rightarrow 2pi^0 K^- +p rightarrow sigma^0 +n e^+ + e^- rightarrow mu^+ + mu^- sigma^0 rightarrow lambda^0 + gamma What are the 4 conservation laws in dealing with decay of fundamental particles?

Explanation / Answer

conservation laws are the

conservation of baryon number and the

conservation of lepton number

conservation laws for parity, isospin, and strangeness have been developed by detailed observation of

particle interactions

conservation of Baryon Number

* nature has specific rules for paticle interactions and decays, and these rules have been summarized in terms of conservation laws

* one of the most important of these is the conservation of baryon number

* each of the baryons is assigned a baryon number B=1

* this can be considered to be equivalent to assigning eachquark a baryon number of 1/3

* this implies that the mesons, with one quark and one antiquark, have a baryon number B=0

* no known decay process or interaction in nature changes the net baryon number

conservation of Lepton Number

* nature has specific rules for particle interactions and decays, and these rules have been summarized in terms of conservation laws

* one of the most important of these is the conservation of lepton number

* this rule is a little more complicated than the conservation of baryon number because there is a separate requirement for each of the three sets of leptons, the electron, muon and tau and their associated neutrinos

parity

* one of the conservation laws which applies to particle interactions is associated with parity

isospin

* isospin is a term introduced to describe groups of particles which have nearly the same mass,

such as the proton and neutron

* this doublet of particles is said to have isospin 1/2, with projection +1/2 for the proton and -1/2 for the neutron

* the three pions compose a triplet, suggesting isospin 1

* the projections are +1 for the positive, 0 and -1 for the neutral and negative pions

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