Hi,
concluding, it must the tossing volume for the GEn Montecarlo for which
the lower bound may be too tight (Vitaliy?). The same may apply to the
d(e,e'p) MC, Adam? Is this a possible explanation for hPz being high in
the lowest bin?
For those interested in this discussion, read from the bottom.
Best regards,
Michael
On Tue, 11 Apr 2006, Chi Zhang wrote:
>
> Dear Michael and Eugene,
>
> sorry, just got back from NYC.
>
> Let's not play with technicality, "starts" means useful stuff starts. I don't
> care about the tiny weeny tail at 22. those are obviously
> mis-recon/resolution-spill-overs. convince yourself by running an epel MC
> with theta lower bound set to say 24.5 degrees and you ll see spills to below
> 23 and the general shape of the tail is well produced. So when we talk about
> acceptance, it starts at ABOVE 24. It is only due to the resolution that we
> start our binning a bit below that. whether or not to go all the way down to
> 22 is your personal call, I don't. even I do, those trailing events will not
> have any impact on any results.
>
> I do not know what went into the GEN Monte Carlo so I can not comment on
> that.
>
> But I know that I looked at BOTH hydrogen runs in late 2004 and deuterium
> runs in 2005 and the acceptance starts from 24. and the plot you showed is
> not any bit different than any of the theta plot we v been looking at for
> years.
>
> If you guys had sit down and spent 1 minute before calling on "everyone", You
> could have really spared me of the heart attack I almost had, and I could
> really have gone to sleep a bit earlier last night since I needed to get up
> 4:30am this morning!
>
> And I refrain myself from commenting on the way BLAST collabroation operates.
>
> Best regards
>
> Chi
>
> On Tue, 11 Apr 2006, Eugene J. Geis wrote:
>
>> 2 postscripts:
>>
>> 1. mc_real.ps
>>
>> top left -> electron theta from my 2005 D2 data from v17
>> GEN cuts made.
>>
>> top right -> same red curve, e-theta with MC on top
>> GEN cuts made on both
>>
>> bottom left -> electron theta from MC files without xs0 weight
>> GEN cuts applied
>>
>> bottom right -> tml, aka generated e-theta from MC files
>> NO GEN CUTS APPLIED.
>>
>> 2. Theta.ps
>>
>> twl from 2005 v17 data from flr files.
>> QWL==-1 is the ONLY CUT.
>>
>>> I did it, 1 minute and I know that the acceptance starts at 24 degrees
>>> fair and square!
>>
>> What is your definition of "starts"? Cause I did it and I saw it "Start"
>> at 22 and finally have a significant rise at 24. fair and square.
>>
>> MC files were run and crunched by Vitaly a few months ago.
>> I can't find their respective directory. According to v17 flr-files
>> and earlier, data acceptance "STARTS" at 22 but does not become
>> significant until 24. MC "STARTS" at 24 and is not significant until
>> 26 degrees.
>>
>> This is what leads to this claim. I see what the plots look like...
>>
>> -eugene
>>
>>
>> Quoting Chi Zhang <zhangchi@MIT.EDU>:
>>
>>>
>>> Hi Michael and Eugene,
>>>
>>> I believe this claim of "mismatch" is utterly nonsense!
>>>
>>> Instead of wasting everyone's time verifying. Why not Eugene explain to
>>>
>>> us what led to this claim. why it takes "a mismatch of data and MC" to
>>>
>>> show "the angle acceptance now start at ~22 degrees", why was
>>> "flrpm->Draw("twl","qwl==-1")"
>>> not enough?
>>>
>>> I did it, 1 minute and I know that the acceptance starts at 24 degrees
>>>
>>> fair and square!
>>>
>>> Why did this claim even get through to BLAST_ANAWAE? 2 degrees span by 1
>>>
>>> meter is a whopping 3.5 centimeters! Did you really believe that the
>>> chambers were (mis)placed to the down stream by more than 3cm?
>>>
>>> Chi
>>>
>>> On Mon, 10 Apr 2006, Michael Kohl wrote:
>>>
>>>> Hi,
>>>>
>>>> we'll meet on Wednesday 2006/04/12 at 13:30 at Bates.
>>>>
>>>> Proposed agenda:
>>>> -Recrunch preparation, bugfixes, workarounds
>>>> -Mascarad handling
>>>> -Shifted acceptance
>>>> Eugene had shown a mismatch of data and MC at low theta_e indicating
>>> that
>>>> the angle acceptance may now start at ~22 degrees instead of ~24
>>> degrees.
>>>> This would have a lot of impact on the dynamics as Q2 would be
>>>> significantly affected by such a shift.
>>>>
>>>> I'm asking everyone to verify this shift. Compare online crunching
>>> with
>>>> v3_4_14 (=ANALDIR) and /net/data/11/Analysis/data/v3_4_17/lrd. The
>>> latter
>>>> version contains ntuples for both hydrogen and 2005 deuterium.
>>>> Checks should be made for true event samples in p(e,e'), p(e,e'p),
>>>> p(e,e'pi+), p(e,e'p)pi0, d(e,e'), d(e,e'd), d(e,e'p), d(e,e'n).
>>>>
>>>>
>>>> Regards,
>>>>
>>>> Michael
>>>>
>>>>
>>>> +-------------------------------------+--------------------------+
>>>> | Office: | Home: |
>>>> |-------------------------------------|--------------------------|
>>>> | Dr. Michael Kohl | Michael Kohl |
>>>> | Laboratory for Nuclear Science | 5 Ibbetson Street |
>>>> | MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
>>>> | Middleton, MA 01949 | U.S.A. |
>>>> | U.S.A. | |
>>>> | - - - - - - - - - - - - | - - - - - - - - -|
>>>> | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
>>>> | Work: +1-617-253-9207 | Home: +1-617-629-3147 |
>>>> | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
>>>> | http://blast.lns.mit.edu | |
>>>> +-------------------------------------+--------------------------+
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>> --------------------------------------------------------------------------
>> Eugene Geis
>> PhD Student, Physics Department, ASU
>> Research Affiliate, MIT-Bates Laboratory of Nuclear Science
>> eugene.geis@asu.edu
>> --------------------------------------------------------------------------
>> http://quickreaction.blogspot.com
>>
>
+-------------------------------------+--------------------------+
| Office: | Home: |
|-------------------------------------|--------------------------|
| Dr. Michael Kohl | Michael Kohl |
| Laboratory for Nuclear Science | 5 Ibbetson Street |
| MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
| Middleton, MA 01949 | U.S.A. |
| U.S.A. | |
| - - - - - - - - - - - - | - - - - - - - - -|
| Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
| Work: +1-617-253-9207 | Home: +1-617-629-3147 |
| Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
| http://blast.lns.mit.edu | |
+-------------------------------------+--------------------------+
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