Hi Vitaliy,
I didn't generate it, I just used Adrian's ntuple; see his
previous message and the log file in my previous email for the
details. Thanks for looking at it.
--Chris
_______________________________________
TA-53/MPF-1/D111 P-23 MS H803
LANL, Los Alamos, NM 87545
505-665-9804(o) 665-4121(f) 662-0639(h)
_______________________________________
On Apr 17, 2006, at 16:54:38, Vitaliy Ziskin wrote:
> Chris,
> Can you tell me what channel you used to generate these events.
> Also, can you send me your kine.init file and the output lines when
> you ran the code. My guess that all events in the tail are somehow
> in this peak around 0. I have no idea where this peak around 0
> comes from and I'm surprised that Adrian did not see it.
>
> Cheers, Vitaliy
>
> Christopher Crawford wrote:
>> I took an initial look at the radiative corrections in MC, and
>> there are problems. I include two problem histograms: the first
>> one is just raw theta in the left sector. It has a significant
>> peak with structure around theta=0, which should not be present.
>> If I had to guess, I would say that the code is generating
>> radiative kinematics in the frame of the outgoing electron instead
>> of in the BLAST frame (although that does not make sense either,
>> since you do see a small tail above v=0.10 GeV^2).
>> The second is a histogram of the invariant mass W for 25 < th_e
>> < 35 deg. Out of the 266406 events in the elastic peak (v < .010
>> GeV^2 or W-M < 5.6 MeV), there were only 45 events in the
>> radiative tail. The original code gives delta(.010)=0.804 and
>> delta(.4427)=0.978, implying 266406*(978-804)/978 = 47397 events
>> in the tail, up to only W=1150 MeV. Note: v = W^2 - M^2 is the
>> inelasticity (a parameter in MASCARAD).
>> Due to small statistics, I was unable to verify the shape of the
>> tail. Anyways, someone must correct these problems before this MC
>> can be trusted for radiative corrections. I will report on
>> corrections based on the original MASCARAD code at the next meeting.
>> --Chris
>> _______________________________________
>> TA-53/MPF-1/D111 P-23 MS H803
>> LANL, Los Alamos, NM 87545
>> 505-665-9804(o) 665-4121(f) 662-0639(h)
>> _______________________________________
>> ---------------------------------------------------------------------
>> ---
>
> --
> **********************************************************************
> *
> Dr. Vitaliy Ziskin 77 Massachusetts Ave
> Research Scientist NW13-202
> Nuclear Science and Engineering Cambridge, Ma, 02134
> MIT (617)253-5466
> vziskin@mit.edu
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