[Clas_lmd] The g11 data with tracking matrices is available

Igor Strakovsky igor at va.gwu.edu
Wed Feb 25 07:42:32 EST 2015

Dear Doctor Kunkel,

Can you shut up and stop insulting people

- Igor Strakovsky

On Wed, 25 Feb 2015 11:27:54 +0100, "Michael C. Kunkel" <mkunkel at jlab.org> 

> Greetings,
> I would like to comment that a person needs not be experienced in G11, 
> but rather programming and hbook conversion.
> BR
> MK
> ----------------------------------------
> Michael C. Kunkel, PhD
>Forschungszentrum Jülich
> Nuclear Physics Institute and Juelich Center for Hadron Physics
> Experimental Hadron Structure (IKP-1)
> www.fz-juelich.de/ikp
> On 2/25/15 8:37 AM, Sudeep Ghosh wrote:
>> Greetings to Everyone,
>>          Finally we have the g11 data available with tracking matrices at
>> "/mss/clas/g11a/production/pass1/v1/ntuple/" in ".hbook" format.
>> We also need to follow instructions below given by Raffaella
>> before converting it to ".root" and using the PID for event
>> selection.
>>          In using this ntuples for the analysis, one should consider that
>> the particle selection in the EVNT (SEB) common blocks is rather
>> loose and additional cuts should be always applied. Listed below
>> are some of the typical cuts used in the analysis (these are a
>> reasonable example but adjustment may be needed depending on the
>> specific analysis) referring to the variable names in the ntuples
>> and assuming vector indexes start from 1 as it is in fortran.
>> charged particles:
>> - dc(i)>0  : ensure track information is available
>> - stat(i)>0: ensure information from the different detector is consistent
>> - may need to cut on m(i) for kaons or on their vertex time
>> - dc_stat(dc(i))>0 : require time-based tracking; dc_stat(dc(i)) is the
>> pointer to the tbtr and tber banks for the i-th particle that may be
>> needed for the kinematic fit
>> general cuts on incoming photon:
>> - taggoodhit>0 : at least one good photon in the tagger
>> - abs(dt_st_tag(1))<1. : difference between start counter and tagger time
>> for the best matching photon is less than 1 ns.
>>        To implement these, we need assistance from someone who has the
>> experience of working on G11.
>> Best regards,
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Igor Strakovsky, SAID CNS The George Washington University
Tel: 703-726-8344(NV),202-994-4742(FB),Skype: igors1945_2
Fax: 202-994-3001(FB),Emails: igor at va.gwu.edu, igor at jlab.org

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