[G14_run] packages/eloss HDICE.F HDICEupstream.F

[Dr. A.M. Sandorfi]

Haiyun, Your eloss.png plot looks in agreement with my hand tracking of the
energy loss at 90 deg.

Eugene, you could well be right that the different bands are associated with
different amounts of material seen at different polar angles. But then I
find it odd that such bands would show up so dramatically in ELOSS vs
momentum but not in ELOSS vs polar angle. The one peculiar feature of the
ELOSS vs angle plots is a vertical band that moves from 115 deg at Z= -9.5
to 140 deg at Z= -4.5 in Haiyun¹s pion plots. The material around the target
is symmetric about 90 deg so it¹s odd that there isn¹t a matching stripe on
the forward side of 90. (The only non-symmetric component is the copper
target ring which is only at back angles, but that can¹t be it because there
are events at larger angles than these stripes.)

Dao, Peng and Irene: could you try Eugene¹s proposed test: create a plot of
the position of the MM peak position after ELOSS correction vs polar angle.

Thanks,...Andy




On 4/23/14, 4:35 PM, "Eugene Pasyuk" <pasyuk at jlab.org> wrote:

> There must be polar angle dependence of the correction because particle see
> different different pieces of IBC. So, the fact you see it is a good thing. To
> check if its correctly accounted for one needs to look at some missing mass
> peak position dependence on the polar angle. After correction is applied there
> should not be dependence if eloss works correctly. Before the correction you
> may see similar discontinuities as you see in delta E and they should be at
> the same angles.
> 
> -Eugene
> 
> 
>> From: "Haiyun Lu" <hlu at jlab.org>
>> To: "g14 run" <g14_run at jlab.org>
>> Sent: Wednesday, April 23, 2014 4:06:27 PM
>> Subject: Re: [G14_run] Fwd: CLAS CVS: packages/eloss HDICE.F HDICEupstream.F
>> 
>>      
>> I found a mistake in my code. The y axis was labeled "delta E", which is
>> supposed to be the difference of energy before and after correction. But the
>> histogram was filled with "delta momentum". I produced a correct histogram
>> and attached (eloss.png).
>>  
>>  To solve the issue that there are multiple bands in the histogram of energy
>> loss vs. momentum as shown by Dao and Peng, I generated protons and pions of
>> various momenta, polar angles, and vertex positions. I attached a pdf file to
>> demonstrate them. As a summary, the polar angle dependence of the energy loss
>> produces the multiple bands.
>>  
>>  
>>  On 04/14/2014 10:00 AM, Haiyun Lu wrote:
>>  
>>  
>>> I attached the new result of eloss correction for proton and pi-.
>>>  
>>>   
>>>  
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