| 1 |
import sys, re, random
|
| 2 |
|
| 3 |
mode = sys.argv[1]
|
| 4 |
if mode == "electrons": mode = 11
|
| 5 |
elif mode == "pions": mode = 211
|
| 6 |
else: raise Exception, "Must pass \"electrons\" or \"pions\" as an argument"
|
| 7 |
|
| 8 |
inevent = False
|
| 9 |
event = {}
|
| 10 |
i = 0
|
| 11 |
for line in sys.stdin:
|
| 12 |
if line == "<event>\n": inevent = True
|
| 13 |
|
| 14 |
# end of an event: modify it and write out
|
| 15 |
if line == "</event>\n":
|
| 16 |
inevent = False
|
| 17 |
|
| 18 |
# find the (3 GeV/c^2) Higgs
|
| 19 |
higgs = 0
|
| 20 |
for j in range(i):
|
| 21 |
if event[j][0] == 25:
|
| 22 |
higgs = j
|
| 23 |
break
|
| 24 |
if higgs != 0:
|
| 25 |
# find its daughters (1 GeV/c^2 Z bosons)
|
| 26 |
Z1 = 0
|
| 27 |
Z2 = 0
|
| 28 |
for j in range(i):
|
| 29 |
if event[j][0] == 23 and event[j][2] == higgs:
|
| 30 |
if Z1 == 0: Z1 = j
|
| 31 |
else:
|
| 32 |
Z2 = j
|
| 33 |
break
|
| 34 |
|
| 35 |
# randomly select one Z to convert to electrons/pions
|
| 36 |
if random.randint(0, 1) == 0: Z = Z1
|
| 37 |
else: Z = Z2
|
| 38 |
|
| 39 |
# convert its daughters into electrons/pions
|
| 40 |
for j in range(i):
|
| 41 |
if event[j][0] == 13 and event[j][2] == Z:
|
| 42 |
event[j][0] = mode
|
| 43 |
elif event[j][0] == -13 and event[j][2] == Z:
|
| 44 |
event[j][0] = -mode
|
| 45 |
|
| 46 |
# write out the event
|
| 47 |
for j in range(i):
|
| 48 |
print " ".join(map(str, event[j]))
|
| 49 |
event = {}
|
| 50 |
i = 0
|
| 51 |
|
| 52 |
# non-event line
|
| 53 |
if not inevent or line == "<event>\n":
|
| 54 |
print line,
|
| 55 |
|
| 56 |
# middle of an event: accumulate the information
|
| 57 |
else:
|
| 58 |
numbers = re.split(r"\s+", line)
|
| 59 |
if i > 0:
|
| 60 |
if numbers[0] == "": numbers = numbers[1:]
|
| 61 |
numbers[0] = int(numbers[0])
|
| 62 |
numbers[2] = int(numbers[2])
|
| 63 |
event[i] = numbers
|
| 64 |
i += 1
|
