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Ming Xie
"Johnson, Tony S." wrote:
> The fermilab stdhep implementation uses a common block to read events into.
> This common block is by default set to contain a maximum of 4000 particles.
> The standard StdHEP DIM used by JAS uses this implementation and is thus
> limited to reading events with 4000 particles.
>
> Is it possible that the implementation you are using has been changed to
> generate more than 4000 particles per event? It sounds strange since I dont
> think we normally get anywhere close to 4000 particles in any of the event
> samples we have generated so far.
>
> If this is really correct we have a second experimental Stdhep DIM, which
> does not use the Fermilab code and is thus not restriced to 4000 particles.
> I have attached the jar file to this message. Just drop this jar file into
> your extensions directory (and possibly delete HepEvt.jar which is the old
> DIM).
>
> Tony
>
> -----Original Message-----
> From: Mike Ronan [mailto:[log in to unmask]]
> Sent: Friday, November 10, 2000 3:12 PM
> To: tonyj
> Cc: lcd-l
> Subject: Error in reading Pandora_PythiaV2.1 STDHEP files directly into
> JAS
>
> Tony,
>
> I've managed to build and Pandora_Pythia on a Solaris box at SLAC w/
> very minor modifications to Masako's instructions. I'm now trying to
> read in and analyze the generated events in JAS through the output
> STDHEP file, but I get the following exception
>
> java.lang.ArrayIndexOutOfBoundsException: 4000
> at jasext.hepevt.HepEvent$HepEnumeration.nextParticle
> at hep.lcd.util.driver.LCDHepEvent$MCHepParticle.getDaughters
> ...
>
> It happens on 97/100 events that I generated w/ the following
>
> gen_eetottbar output.dat 100 > output.list
>
> from the examples. The Pandora_Pythia output summary looks fine (see
> below), and STDHEP doesn't complain, i.e.
>
> ********************************************************
> * STDHEP version 4.07 - July 14, 1999 *
> ********************************************************
>
> STDXWOPEN WARNING: I/O is initialized for stdhep only
>
> STDXEND: 513431 words i/o with 10012 efficiency
>
> Mike
>
>
> The value of the integral is 739.999 pm 11.8396
> and the maximum weight found is 21772.2
> ...
>
> ======================================
> Welcome to pandora_pythia.
> ======================================
>
> --------------------------------------
> Cross section = 738.543190
> ...
>
> Event listing (summary)
>
> I particle/jet KS KF orig p_x p_y p_z
> E m
>
> 1 !e-! 21 11 0 0.000 0.000 250.000
> 250.000 0.001
> 2 !e+! 21 -11 0 0.000 0.000 -250.000
> 250.000 0.001
> 3 !gamma! 21 22 0 0.000 0.000 0.252
> 0.252 0.000
> 4 !gamma! 21 22 0 0.000 0.000 -0.525
> 0.525 0.000
> 5 !phasespa! 21 83 0 0.021 -0.040 0.240 499.223
> 499.223
> 6 !t! 21 6 5 101.195 130.398 -21.348 242.648
> 176.574
> 7 !tbar! 21 -6 5 -101.195 -130.398 21.621 256.575
> 195.241
>
> ---------------------------------------------------------------------------
> Name: StdHep.jar
> StdHep.jar Type: Java Archive (application/java-archive)
> Encoding: BASE64
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