8. THE CHARM of MATTER
The second quark of the second generation of elementary particles is called the charm (c) quark. The c quark is expected to decay into an s quark. Table 1-6 provides a listing of some of the hadrons containing a c quark.
Table 1-6
CHARM HADRONS
|
Hadron |
Hadron Type |
Quark Structure |
Charge |
Mass |
|
Lambda_c+ ( L+c) |
Baryon |
udc |
+1 |
2.281 Gev |
|
D 0 |
Meson |
u*c |
0 |
1.865 Gev |
|
D + |
Meson |
d*c |
+1 |
1.869 Gev |
|
J/psi (J/Y) or Eta_c (hC) |
Meson |
c*c |
0 |
3.097 Gev |
LAMBDA_c+ L+c
Only the lambda_c+ baryon and D 0 meson EPSMs will be developed to show the c quark EPSM. The last one, J/psi (or eta_c), is left as an exercise to the reader to develop the c anti-quark EPSM to go with the c quark EPSM. The lambda_c+ baryon can decay to Lambda, pi +, pi+ and pi-. Thus, Figure 1-61 shows the lambda_c+ EPSM and Figure 1-62 shows the c quark EPSM. It is noted that the hadron with the uuc quark structure, if it exists, would require a second c quark similar to the way that the s quark required a second one to maintain the correct quark configuration.
Figure 1-61: Lambda_c+ EPSM as determined by its decay products.
Figure 1-62: The c quark. A u quark and d quark were removed from the Lambda_c+ EPSM in Figure 1-61.
D MESONS
D 0 MESON
The D 0 (u*c) meson is shown in Figures 1-63.
Figure 1-63: The D 0 meson EPSM.
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