Лекции по основам кинематики элементарных процессов. Строковский Е.А. - 276 стр.

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p
a
=
λ
1/2
s, m
2
a
,m
2
b
2m
b
,E
a
=
s − m
2
a
− m
2
b
2m
b
,E
a
+m
b
=
s − m
2
a
+ m
2
b
2m
b
.
m
a
= m
b
= m
β
cm
=
p
a
E
a
+ m
b
=
λ
1/2
s, m
2
,m
2
s
.
a
β
∗
a
=
p
∗
E
∗
,
m
a
= m
b
= m
β
∗
a
=
p
∗
E
∗
=
λ
1/2
s, m
2
,m
2
s
,
β
cm
= β
∗
a
g
∗
a
=
β
cm
β
∗
a
=1.
−β
cm
” ”
p
z
= γ
cm
(β
cm
E
∗
+ p
∗
z
) , p
⊥
=0.
| p
z
|
| p
z
|=| β
∗
|·E
∗
p
z
= γ
cm
E
∗
(β
cm
+ β
∗
) , p
⊥
=0,
5  ; ;   "A C   0  
         
     λ1/2 s, m2a , m2b        s − m2a − m2b             s − m2a + m2b
pa =                   , Ea =               , Ea + mb =               .
           2mb                    2mb                       2mb
.    7  C    F 1  65  G 
  C            
   0    ma = mb = m?
                                       
                            pa     λ1/2 s, m2 , m2
                 βcm   =         =                 .
                         Ea + mb          s
      a         0   
                         ∗
                                       p
                               βa∗ =      ,
                                       E∗
1    C   1   7 20 1     
   F   FA +G  FA *GG0    ma = mb = m
 ?                  ∗      1/2
                                     2    2
                            p     λ        s, m , m
                    βa∗ =     ∗
                                =                     ,
                            E                s
   ?
                          ga∗ = ββcm∗ = 1 .
                   βcm = βa∗
                                     a
;   0   '    0
%7   * 6    *  0
   % )!    '   +     
     3'    
5  ";            C 
   5 −βcm F ””  0   1   
      1  1 C 1 5 
       G I2  1     
       0 2  1     
1  0
                  pz = γcm (βcm E ∗ + p∗z ) , p⊥ = 0 .

   2  | pz |      1 2 1      
 0   | p z |=| β ∗ | ·E ∗  8 5   
                  pz = γcm E ∗ (βcm + β ∗ ) , p⊥ = 0 ,

                                      +E

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