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HPS-SOFTWARE  May 2016

HPS-SOFTWARE May 2016

Subject:

Re: [Hps-analysis] Moller Generator Fixed! (again)

From:

Bradley T Yale <[log in to unmask]>

Reply-To:

Software for the Heavy Photon Search Experiment <[log in to unmask]>

Date:

Sat, 14 May 2016 18:24:05 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (219 lines)

If you want to look at the offset Mollers with the recently fixed cross section:
/u/group/hps/users/byale/mol_v3/rot_moller_v3.stdhep

And the same with no cuts, that have the full high and low peaks included:
/u/group/hps/users/byale/mol_uncut/rot_moller_v3_uncut.stdhep

Brad
________________________________________
From: [log in to unmask] <[log in to unmask]> on behalf of Bradley T Yale <[log in to unmask]>
Sent: Saturday, May 14, 2016 2:09 PM
To: Maruyama, Takashi; 'Valery Kubarovsky'
Cc: Uemura, Sho; Maurik Holtrop; [log in to unmask]; hps-software; Graf, Norman A.
Subject: Re: [Hps-analysis] Moller Generator Fixed! (again)

If you used the individual files in
/u/group/hps/users/byale/mol_v2/2pt3/
or
/mss/hallb/hps/production/stdhep/mollers/2pt3/

then these do not have the 30.5 mrad offset applied yet. So the actual positions will be shifted slightly to the left.

Try
/u/group/hps/users/byale/mol_v2/2pt3/rot_molv2_MERGED.stdhep

These are the same 10 files with the rotation.
Brad


________________________________________
From: [log in to unmask] <[log in to unmask]> on behalf of Maruyama, Takashi <[log in to unmask]>
Sent: Friday, May 13, 2016 6:13:31 PM
To: 'Valery Kubarovsky'
Cc: Uemura, Sho; Bradley T Yale; Maurik Holtrop; [log in to unmask]; hps-software; Graf, Norman A.
Subject: RE: [Hps-analysis] Moller Generator Fixed! (again)

Hi Valery,

Attached is the distributions you requested. These are Brad's EGS5 generated Mollers. If I use the solid lines to represent the crystal edges, one of the Moller electrons always falls in this removed crystal area; ie both e-'s cannot be detected by ECal.

Takashi

-----Original Message-----
From: Valery Kubarovsky [mailto:[log in to unmask]]
Sent: Friday, May 13, 2016 12:08 PM
To: Maruyama, Takashi
Cc: Uemura, Sho; Bradley T Yale; Maurik Holtrop; [log in to unmask]; hps-software; Graf, Norman A.
Subject: Re: [Hps-analysis] Moller Generator Fixed! (again)

Hi Takashi,

Can you make a several plots from your fast MC:

1. Y vs X of the tracks at the face-off the calorimeter:
2. The same plot when both of tracks are detected by Ecal 3. The energy distribution of the electrons for the events when both tracks detected by Ecal.

I think that it is not very difficult for you.
The main question to resolve will get the dip in the energy distribution or bump at the E=Ebeam/2.

Thanks in advance,
Valery



----- Original Message -----
> From: "Takashi Maruyama" <[log in to unmask]>
> To: "Sho Uemura" <[log in to unmask]>, "Bradley T Yale"
> <[log in to unmask]>
> Cc: "Maurik Holtrop" <[log in to unmask]>, [log in to unmask],
> "hps-software" <[log in to unmask]>, "Valery Kubarovsky"
> <[log in to unmask]>, "Norman A. Graf" <[log in to unmask]>
> Sent: Friday, May 13, 2016 1:28:29 PM
> Subject: RE: [Hps-analysis] Moller Generator Fixed! (again)

> Thanks, Sho. I was going to say exactly the same thing. Attached is
> Moller distribution at layer 6 in my fast tracking using Brad's Moller
> events. Moller problem is somewhere else.
>   Takashi
>
> -----Original Message-----
> From: [log in to unmask]
> [mailto:[log in to unmask]] On Behalf Of Sho Uemura
> Sent: Friday, May 13, 2016 9:00 AM
> To: Bradley T Yale
> Cc: Maurik Holtrop; [log in to unmask]; hps-software; Valeri
> Koubarovski; Graf, Norman A.
> Subject: Re: [Hps-analysis] Moller Generator Fixed! (again)
>
> By the usual definition of theta_y (angle of elevation from the xz
> plane), the direction cosine cos(b) (where b is the angle of
> inclination from the
> y-axis) exactly equals sin(theta_y).
>
> What I meant to say is that in small angle, sin(theta_y)~=theta_y. The
> relation
> sin(theta)sin(phi)=sin(theta_y) is exact.
>
> On Fri, 13 May 2016, Bradley T Yale wrote:
>
>> Even if theta is a small angle, it is multiplied by sin(phi), where phi is not.
>> ________________________________________
>> From: [log in to unmask] <[log in to unmask]>
>> on behalf of Sho Uemura <[log in to unmask]>
>> Sent: Friday, May 13, 2016 11:00:46 AM
>> To: Maurik Holtrop
>> Cc: Bradley T Yale; [log in to unmask]; HPS Software; Valeri
>> Koubarovski; Norman A. Graf
>> Subject: Re: [Hps-analysis] Moller Generator Fixed! (again)
>>
>> I don't understand - I thought this cut was intended as a theta_y cut
>> (>10 mrad above or below the beam plane,so we only keep particles
>> that might hit a detector), and does v(np) not correctly describe theta_y?
>>
>> So I buy that this explains the difference in the envelope of your MC
>> truth distribution from theory (the U shape) but not that this has
>> anything to do with the gap, or any data-MC discrepancy seen after
>> readout.
>>
>> On Fri, 13 May 2016, Maurik Holtrop wrote:
>>
>>> Hi Bradley,
>>>
>>> That is great investigative work. You should now indeed check the
>>> other EGS5 generators for similar issues. As we discussed yesterday,
>>> there may be an issue with the background events for tridents.
>>>
>>> Can you please mention (advertise) this new result at the analysis
>>> meeting today?
>>>
>>> Best,
>>>       Maurik
>>>
>>>
>>>> On May 13, 2016, at 3:25 AM, Bradley T Yale <[log in to unmask]> wrote:
>>>>
>>>> I think I found the real problem with how the Moller generator was
>>>> initially set up.
>>>> This one affects the generated distribution a LOT more than the RNG
>>>> precision probably did, and explains the remaining strangeness in
>>>> the generated distribution.
>>>>
>>>> Looking at the egs5 Moller procedure, the angular cut was defined as:
>>>>
>>>> abs(v(np)) > 0.010 radians
>>>>
>>>> where v(np) is supposed to be theta.
>>>> However, the variables u, v, and w in egs are actually directional cosines, p_x
>>>> = p*u,   p_y = p*v,   and   p_z = p*w.
>>>>
>>>> So this means that in reality, the generator was saving Moller
>>>> events such that abs [ sin(theta)*sin(phi) ] > 0.010
>>>>
>>>> which has a periodic nature to it. Plot this equation for some
>>>> value of phi (or just think about it) and you'll see what was
>>>> likely making these strange hills and gaps in the energy distribution - full-wave rectified Mollers!
>>>>
>>>> The scattered beam simulation does correctly define theta though:
>>>> sqrt[ u^2 + v^2 ]
>>>>
>>>> I made a moller_v3 procedure with this correction (still with a >10
>>>> mrad cut), and the comparison between before and after is shown.
>>>> The generated events now agree with the calculated cross section
>>>> (XS curve is shown on the 'bad' plot), and no apparent missing events.
>>>>
>>>> These will be run through recon to see if we can finally get good
>>>> Moller agreement with data.
>>>> I'm also going to try changing the scattered beam energy cut shown
>>>> in the software meeting to see if it fixes Tim's phi vs. energy discrepancy.
>>>> -Brad
>>>> <BadMollers.png><2pt3_mol_v3_moller_E.png>_________________________
>>>> _
>>>> _____________________
>>>> Hps-analysis mailing list
>>>> [log in to unmask] <mailto:[log in to unmask]>
>>>> https://mailman.jlab.org/mailman/listinfo/hps-analysis
>>>> <https://mailman.jlab.org/mailman/listinfo/hps-analysis>
>>>
>>
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