[G14_run] Eloss values for g14

[Igor Strakovsky]

Eugene,

I am confused - for the g10 (Wei) and g13 (Paul and Daria) analyses the 
statement was 200 MeV/c (Daria's point was 150 MeV/c).

Igor

On Wed, 2 Apr 2014 12:00:55 -0400 (EDT), Eugene Pasyuk <pasyuk at jlab.org> 
wrote:

> Andy, 
> 
> 65 MeV protons at vertex will not be detected in CLAS. Minimum momentum of 
>reliably reconstructed tracks for protons is at least 300-350 MeV/c. They 
>have to get through roughly 5 m of air, six drift chambers and be detected in 
>TOF counter. From that reconstructed by drift chambers momentum eloss works 
>backwards to the vertex: ~1m of air, start counter IBC, the particle gains 
>energy. 
> 
> -Eugene 
> 
> ----- Original Message -----
> 
>> From: "Dr. A.M. Sandorfi" <sandorfi at jlab.org>
>> To: "g14 run" <g14_run at jlab.org>
>> Sent: Wednesday, April 2, 2014 11:23:00 AM
>> Subject: [G14_run] Eloss values for g14
> 
>> Eloss values for g14 Folks,
> 
>> Regarding ELOSS, the Tech Note (HDice_TN22) that I put together for
>> Eugene can be downloaded from:
>> < http://www.jlab.org/Hall-B/HDIce/technotes/HDice_TN22_IBC_dEdx.pdf
>> > .
> 
>> The Appendix at the end gives examples of explicit energy loss
>> evaluations for pions and protons (a) near the low end of their
>> acceptance (25 MeV for pions and 65 MeV for protons) and (b) at 1
>> GeV (~ minimizing ionizing for both). These were calculated for lab
>> angles of 90 degrees where the material thicknesses are their least.
>> The calculations assume events originate at the center of the
>> target. As an extreme case, the Eloss from events coming from the
>> outer edge of the HD nearest the detector would be down by the
>> entries in the first two rows of the tables. There is no way a pion
>> can loose less than 4.6 MeV by the time it exits the IBC and gets to
>> the Start Counter.
> 
>> Andy
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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