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Commit | Line | Data |
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da0e9ce3 | 1 | FUNCTION PHOTRI(A,B,C) |
2 | C.---------------------------------------------------------------------- | |
3 | C. | |
4 | C. PHOTOS: PHOton radiation in decays calculation of TRIangle fie | |
5 | C. | |
6 | C. Purpose: Calculation of triangle function for phase space. | |
7 | C. | |
8 | C. Input Parameters: A, B, C (Virtual) particle masses. | |
9 | C. | |
10 | C. Output Parameter: Function value = | |
11 | C. SQRT(LAMBDA(A**2,B**2,C**2))/(2*A) | |
12 | C. | |
13 | C. Author(s): B. van Eijk Created at: 15/11/89 | |
14 | C. Last Update: 02/01/90 | |
15 | C. | |
16 | C.---------------------------------------------------------------------- | |
17 | IMPLICIT NONE | |
18 | DOUBLE PRECISION DA,DB,DC,DAPB,DAMB,DTRIAN | |
19 | REAL*8 A,B,C,PHOTRI | |
20 | DA=A | |
21 | DB=B | |
22 | DC=C | |
23 | DAPB=DA+DB | |
24 | DAMB=DA-DB | |
25 | DTRIAN=SQRT((DAMB-DC)*(DAPB+DC)*(DAMB+DC)*(DAPB-DC)) | |
26 | PHOTRI=DTRIAN/(DA+DA) | |
27 | RETURN | |
28 | END |