-
Notifications
You must be signed in to change notification settings - Fork 2
/
Readme
122 lines (99 loc) · 4.56 KB
/
Readme
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
The STARlight Monte Carlo models 2-photon and photon-Pomeron interactions
in ultra-peripheral heavy ion collisions. The physics approach for the photon-Pomeron
interactions is described in Klein and Nystrand, Phys. Rev. C60, 014903 (1999),
with the p_t spectrum (including vector meson interference) discussed in Phys. Rev.
Lett. 84, 2330 (2000). The 2-photon interactions are described in Baltz, Gorbunov,
Klein, Nystrand, Phys.Rev. C80 (2009) 044902.
STARlight has several input files, all of which are expected to be in the
same directory as the starlight code. User-specified input parameters are
read from a file named "slight.in"; these parameters are described
below.
The output of the STARlight Monte Carlo will be written to an ascii file
named "slight.out".
----------------------------------------------------------------------------
The contents of a sample slight.in file are listed below, with
explanation. The user should modify this file according to his or her
needs.
BEAM_1_Z = 82 #Z of projectile
BEAM_1_A = 208 #A of projectile
BEAM_2_Z = 82 #Z of target
BEAM_2_A = 208 #A of target
BEAM_GAMMA = 1470 #Gamma of the colliding ions
W_MAX = 12.0 #Max value of w
W_MIN = -1 #Min value of w
W_N_BINS = 40 #Bins i w
# maximum and minimum values for w (the gamma-gamma center of mass
# energy, w = 4(E1)(E2), (Setting W_MIN = -1 tells STARlight to use the default values
# specified in inputParameters.cpp; otherwise, specify wmin here, and the number
# of w bins in the lookup tables
RAP_MAX = 8. # max rapidity
RAP_N_BINS = 80 # Number of y bins used in the cross section calculation
CUT_PT = 0 #Cut in pT? 0 = (no, 1 = yes)
PT_MIN = 1.0 #Minimum pT in GeV
PT_MAX = 3.0 #Maximum pT in GeV
CUT_ETA = 0 #Cut in pseudorapidity? (0 = no, 1 = yes)
ETA_MIN = -10 #Minimum pseudorapidity
ETA_MAX = 10 #Maximum pseudorapidity
PROD_MODE = 2 #gg or gP switch (1 = two-photon, 2 = coherent vector meson, 4 = incoherent vector meson )
N_EVENTS = 10 #Number of events produced
PROD_PID = 443013 #Channel of interest (in PDG notation); currently supported options listed below
RND_SEED = 34533 #Random number seed
BREAKUP_MODE = 5 #Controls the nuclear breakup
# Note that this option only works for lead or gold; it should work at any energy
# 1 = hard sphere nuclei (b>2R)
# 2 = require that both nuclei break up (Xn,Xn)
# 3 = a single neutron from each nucleus (1n,1n)
# 4 = require that neither nucleus breaks up (0n,0n)
# 5 = require that there be no hadronic break up
# (This is similar to option 1, but with the actual hadronic interaction
# probability)
# 6 = require break up of one or both nuclei (Xn)
# 7 = require break up of one nucleus (Xn,0n)
INTERFERENCE = 0 #Interference (0 = off, 1 = on)
IF_STRENGTH = 1. #% of intefernce (0.0 - 0.1)
INT_PT_MAX = 0.24 #Maximum pt considered, when interference is turned on
INT_PT_N_BINS =120 #Number of pt bins when interference is turned on
COHERENT = 1 #Coherent=1,Incoherent=0 production for assym collisions
INCO_FACTOR = 1. #percentage of incoherence
----------------------------------------------------------------------------
Currently supported 2-photon channel options:
jetset id particle
---------------------------------
221 eta
331 eta-prime
441 eta-c
9010221 f0(975)
225 f2(1270)
115 a2(1320)
335 f2(1525)
33 rho0 pair
11 e+/e- pair
13 mu+/mu- pair
15 tau+/tau- pair
Currently supported vector meson options:
jetset id particle
---------------------------------
113 rho0
223 omega
333 phi
443011 J/psi --> e+e-
443013 J/Psi --> mu+mu-
444011 Psi(2S) --> e+e-
444013 Psi(2S) --> mu+mu-
553011 Upsilon(1S) --> e+e-
553013 Upsilon(1S) --> mu+mu-
554011 Upsilon(2S) --> e+e-
554013 Upsilon(2S) --> mu+mu-
555011 Upsilon(3S) --> e+e-
555013 Upsilon(3S) --> mu+mu-
913 rho0 + direct pi+pi- (with interference)
The direct pi+pi- fraction is from the ZEUS results
Logs:
fixed types for class Particle
- Int -> Double
- fixed Makefile ..
autoconfig will appear in the future .. make sure paths are fixed before compiling
this is for includes and libraries in Makefile
- don't forget about link to pythia xml doc
This is located in main.cpp
- changed PID of the charged KAON to 321 and neutral kaon to 310 .. it should work now for phi -> kk