sPHENIX discussion of software

[Megan Connors <meganEconnors AT gmail.com>]

Dear all,

To follow up on the discussion during Rosi's slides at yesterdays simulation meeting I fit the jet response histogram for the no inner case. The sigma for the no inner is significantly larger while the low side tail is actually slightly less than the thinned Hcal. For completeness attached is the plot with all the histos and the fits. The results of the fits are listed below. The % below is slightly different from my previous email because these now include the points down to 0 as opposed to 0.3 but the effect is minimal.

Nominal:
% below 2-sigma cut of 0.66848 = 4.42626
mean: 0.834692  sigma: 0.0831063

Thin Hcal:
% below 2-sigma cut of 0.649051 = 6.08565
mean: 0.822129  sigma: 0.0865391

Ganged:
% below 2-sigma cut of 0.66901 = 4.51812
mean: 0.834154  sigma: 0.0825722

No Inner Hcal:
% below 2-sigma cut of 0.611195 = 5.72717
mean: 0.803371  sigma: 0.0960879

Best,

-Megan

On Tue, May 24, 2016 at 5:47 PM, Huang, Jin <jhuang AT bnl.gov> wrote:

 

Announcement:

RCF Group registration is open: http://goo.gl/forms/5SzP94oiHfq1dB802

 

 

Repository update:

Action Item [Nils & Jin]: double check Pythia6 pull request

Action Item [Jin]: Rais a GitHub issue on the NAN vertex

 

 

Making TPC simulation working: Mike McCumber

 

Alan, Mike, Tony and Sourav worked on multiple fronts on the TPC software:

·       Memory use issue: Problem in clustering. Mike found a possible fix

·       HIJING reconstruction: able to reconstruct within a slice of pseudo-rapidity slice in expert mode. First test show encouraging results.

·       Momentum reconstruction issue: possible fix via fixing clustering

·       z digitization and clustering: Alan just proposed fix

 

Discussions:

Gunther: does HIJING simulation has all underlying hits in the eta slice?

Mike: Yes

Gunther: consider extract projection residual

Mike: need more days in order to get that.

 

Tom: model for distortion estimation in TPC is ready.

 

Next:

Action Items [Mike]: Fix single particle performance check: 

Action Items [Tom, Jin, Tony]: implement TPC distortion in production code

 

 

Jet structure Calorimeter simulation – Rosi Reed

 

Page 10: How to quantify tails?

Jamie: high-Z punch through could be rejected via z>1 cut

Jamie: how to quantify effect of tails?

Gunther: would require full jet analysis.

Rosi: JS TG plan to study after ALD charge

 

Page 11:

Need fit on the points to quantify deviation from Gauss

 

Page 12:

Gunther: Does reduced EMCal + thin HCal response lead to large difference?

Rosi: will follow up

 

Page 13:

Sarah: extreme thin case needed?

Gunther: not required

Dave: is track momentum using truth momentum?

Rosi: Yes. Full tracking simulation has to be deferred to after charge

 

Page 18:

Jamie: jet leakage is related to E, not ET.

Rosi: good point.

Is flat plates used in Hcal and does HCal radiation length gets larger in simulation?

Jin/John: Yes. In both simulation and mechanical design

 

Page 19: post ALD charge, plan to include tracking in jet structure studies

 

General comment:

Sarah, Rosi: 1-D SPACAL was selected for fast computing in ALD charge. No preference from jet group yet

 

Page 21:

Task list that need volunteer!

 

 

Kalman filter tests – Haiwang Yu

 

Page 3:

Mike: be cautious caveats in vertex use in single track study.

Haiwang, Jin: this definition of DCA_2D is specifically designed for fitter cross check,

 

Page 4: GenFit DCA resolution seems worse in low momentum tracks

Mike: Check efficiency too, in case GenFit included more tracks with bad fits

Jin: Suggest only compare track that passed both fitter

 

Plan:

·       Check efficiency in DCA comparison

·       Implement primary track fits

 

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

 

> -----Original Message-----

> From: Huang, Jin

> Sent: Monday, May 23, 2016 5:08 PM

> To: 'sphenix-l AT lists.bnl.gov' <sphenix-l AT lists.bnl.gov>; 'sphenix-software-

> l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>

> Subject: [reminder] sPHENIX simulation and software meeting, Tue May 24,

> 1PM EST @ 2-219.

>

> Hello everyone,

>

> This is a reminder that we will have a quick sPHENIX simulation and software

> meeting, Tue May 24, 1PM EST @ 2-219.

>

> Currently on agenda:

> •         Tracking software updates

> •         Kalman filter with primary vertex refit and DCA checks

> •         (tentative) calorimeter simulations in jet structure group

> More contributions are welcomed too.

>

> The agenda page is at

> https://indico.bnl.gov/conferenceDisplay.py?confId=1911   , for which the

> common modification password is "1008"

> •            For residents at BNL, we will meet at the 2-219 conference room this

> time

> •            To join the Meeting via phone bridge:

> https://bluejeans.com/619960505

> •            To join via Phone:

> 1) Dial:

>         +1.408.740.7256

>         +1.888.240.2560(US Toll Free)

>         +1.408.317.9253(Alternate number)

>         (see all numbers - http://bluejeans.com/numbers)

> 2) Enter Conference ID: 619960505

>

> Cheers,

>

> Jin

>

>

> ______________________________

>

> Jin HUANG

>

> Brookhaven National Laboratory

> Physics Department, Bldg 510 C

> Upton, NY 11973-5000

>

> Office: 631-344-5898

> Cell:   757-604-9946

> ______________________________

>

 

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