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c683985a 1The STARlight Monte Carlo models 2-photon and photon-Pomeron interactions
2in ultra-peripheral heavy ion collisions. The physics approach for the photon-Pomeron
3interactions is described in Klein and Nystrand, Phys. Rev. C60, 014903 (1999),
4with the p_t spectrum (including vector meson interference) discussed in Phys. Rev.
5Lett. 84, 2330 (2000). The 2-photon interactions are described in Baltz, Gorbunov,
6Klein, Nystrand, Phys.Rev. C80 (2009) 044902.
7
8STARlight has several input files, all of which are expected to be in the
9same directory as the starlight code. User-specified input parameters are
10read from a file named "slight.in"; these parameters are described
11below.
12
13The output of the STARlight Monte Carlo will be written to an ascii file
14named "slight.out".
15
16----------------------------------------------------------------------------
17
18The contents of a sample slight.in file are listed below, with
19explanation. The user should modify this file according to his or her
20needs.
21BEAM_1_Z = 82 #Z of projectile
22BEAM_1_A = 208 #A of projectile
23BEAM_2_Z = 82 #Z of target
24BEAM_2_A = 208 #A of target
25BEAM_GAMMA = 1470 #Gamma of the colliding ions
26
27W_MAX = 12.0 #Max value of w
28W_MIN = -1 #Min value of w
29W_N_BINS = 40 #Bins i w
30 # maximum and minimum values for w (the gamma-gamma center of mass
31 # energy, w = 4(E1)(E2), (Setting W_MIN = -1 tells STARlight to use the default values
32 # specified in inputParameters.cpp; otherwise, specify wmin here, and the number
33 # of w bins in the lookup tables
34
35RAP_MAX = 8. # max rapidity
36RAP_N_BINS = 80 # Number of y bins used in the cross section calculation
37
38CUT_PT = 0 #Cut in pT? 0 = (no, 1 = yes)
39PT_MIN = 1.0 #Minimum pT in GeV
40PT_MAX = 3.0 #Maximum pT in GeV
41CUT_ETA = 0 #Cut in pseudorapidity? (0 = no, 1 = yes)
42ETA_MIN = -10 #Minimum pseudorapidity
43ETA_MAX = 10 #Maximum pseudorapidity
44
45PROD_MODE = 2 #gg or gP switch (1 = two-photon, 2 = coherent vector meson, 4 = incoherent vector meson )
46
47N_EVENTS = 10 #Number of events produced
48
49PROD_PID = 443013 #Channel of interest (in PDG notation); currently supported options listed below
50RND_SEED = 34533 #Random number seed
51
c683985a 52BREAKUP_MODE = 5 #Controls the nuclear breakup
53 # Note that this option only works for lead or gold; it should work at any energy
54 # 1 = hard sphere nuclei (b>2R)
55 # 2 = require that both nuclei break up (Xn,Xn)
56 # 3 = a single neutron from each nucleus (1n,1n)
57 # 4 = require that neither nucleus breaks up (0n,0n)
58 # 5 = require that there be no hadronic break up
59 # (This is similar to option 1, but with the actual hadronic interaction
60 # probability)
61 # 6 = require break up of one or both nuclei (Xn)
62 # 7 = require break up of one nucleus (Xn,0n)
63
64INTERFERENCE = 0 #Interference (0 = off, 1 = on)
65IF_STRENGTH = 1. #% of intefernce (0.0 - 0.1)
c683985a 66INT_PT_MAX = 0.24 #Maximum pt considered, when interference is turned on
67INT_PT_N_BINS =120 #Number of pt bins when interference is turned on
0e1bd874 68COHERENT = 1 #Coherent=1,Incoherent=0 production for assym collisions
69INCO_FACTOR = 1. #percentage of incoherence
c683985a 70
71
72----------------------------------------------------------------------------
73
74Currently supported 2-photon channel options:
75 jetset id particle
76 ---------------------------------
77 221 eta
78 331 eta-prime
79 441 eta-c
80 9010221 f0(975)
81 225 f2(1270)
82 115 a2(1320)
83 335 f2(1525)
84 33 rho0 pair
85 11 e+/e- pair
86 13 mu+/mu- pair
87 15 tau+/tau- pair
88
89Currently supported vector meson options:
90 jetset id particle
91 ---------------------------------
92
93 113 rho0
94 223 omega
95 333 phi
96 443011 J/psi --> e+e-
97 443013 J/Psi --> mu+mu-
98 444011 Psi(2S) --> e+e-
99 444013 Psi(2S) --> mu+mu-
100 553011 Upsilon(1S) --> e+e-
101 553013 Upsilon(1S) --> mu+mu-
102 554011 Upsilon(2S) --> e+e-
103 554013 Upsilon(2S) --> mu+mu-
104 555011 Upsilon(3S) --> e+e-
105 555013 Upsilon(3S) --> mu+mu-
106 913 rho0 + direct pi+pi- (with interference)
107The direct pi+pi- fraction is from the ZEUS results
108
109
110
111Logs:
112
113fixed types for class Particle
114- Int -> Double
115- fixed Makefile ..
116 autoconfig will appear in the future .. make sure paths are fixed before compiling
117 this is for includes and libraries in Makefile
118- don't forget about link to pythia xml doc
119 This is located in main.cpp
120
121- changed PID of the charged KAON to 321 and neutral kaon to 310 .. it should work now for phi -> kk
122