[Clas12_verystrange] Very Strange Meeting May 2nd

[Michael Dugger]

Derek,

Your stuff looks better than mine. I am using 6.423 GeV for the electron 
beam energy and then subtract off the tagger energy like:

TLorentzVector beam(0.0,0.0,6.423-ftEnergy,6.423-ftEnergy);

with ftEnergy taken from

FT_particles_energy

Does that look wrong?

Any help is appreciated.

Take care,
Michael

On Wed, 2 May 2018, Derek Glazier wrote:

> Hi Mike,
>
>
>> ** There are a lot more events at large angle and low momentum. I assume
>> these events are coming from CTOF, but have not checked that assumption.
> This is possibly the new CVT tracking algorithm which seems to be much more 
> efficient, while also introducing some extra background.
>> The Bad and the Ugly->
>> 
>> * I tried to do a missing mass for the reaction gamma p -> p X. Get huge
>> bump at massX squared = - 0.1 . Can't figure out what is going on there.
> For FT e- and run 3050 I would expect a large elastic peak at massX=0, this 
> is what I get. Could some calibration be off? For run 3050 I use 6.4GeV beam 
> energy.
>> 
>> * The invariant mass of the proton pi^- system is just a blob at masses
>> that look somewhat high. Just a mess really.
>> 
>> If anyone can get any good looking physics (some sort of invariant mass
>> peak at about the right location), please let me know. My stuff is just
>> kind of awful :(
> I attach a slide for eppi+pi- final state. I seem to get missing mass peaks 
> at the right place and the 2pi invariant mass looks like a rho. The last few 
> updates have certainly improved the cooked data quality. Although I do not 
> see any Deltas for some reason.
> Cheers
> Derek
>> 
>> Take care,
>> Michael
>> 
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