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pivarski |
1.1 |
import sys, re, random
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mode = sys.argv[1]
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if mode == "electrons": mode = 11
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elif mode == "pions": mode = 211
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else: raise Exception, "Must pass \"electrons\" or \"pions\" as an argument"
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inevent = False
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event = {}
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i = 0
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for line in sys.stdin:
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if line == "<event>\n": inevent = True
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# end of an event: modify it and write out
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if line == "</event>\n":
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inevent = False
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# find the (3 GeV/c^2) Higgs
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higgs = 0
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for j in range(i):
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if event[j][0] == 25:
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higgs = j
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break
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if higgs != 0:
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# find its daughters (1 GeV/c^2 Z bosons)
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Z1 = 0
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Z2 = 0
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for j in range(i):
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if event[j][0] == 23 and event[j][2] == higgs:
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if Z1 == 0: Z1 = j
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else:
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Z2 = j
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break
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# randomly select one Z to convert to electrons/pions
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if random.randint(0, 1) == 0: Z = Z1
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else: Z = Z2
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# convert its daughters into electrons/pions
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for j in range(i):
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if event[j][0] == 13 and event[j][2] == Z:
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event[j][0] = mode
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elif event[j][0] == -13 and event[j][2] == Z:
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event[j][0] = -mode
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# write out the event
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for j in range(i):
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print " ".join(map(str, event[j]))
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event = {}
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i = 0
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# non-event line
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if not inevent or line == "<event>\n":
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print line,
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# middle of an event: accumulate the information
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else:
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numbers = re.split(r"\s+", line)
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if i > 0:
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if numbers[0] == "": numbers = numbers[1:]
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numbers[0] = int(numbers[0])
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numbers[2] = int(numbers[2])
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event[i] = numbers
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i += 1
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