Nov2012

Friday, November 30

Hello

We will have our bi-weekly JLab-PWA meeting this Friday 11/30 (tomorrow) at 10AM-11AM Room L207 Agenda

• Ryan Mitchell will finish his tutorial on the AmpTools software

We are going to use the following remote access: To begin your audio conference:

1. Dial Toll-Free Number: 866-740-1260 (U.S. & Canada) 2. International participants dial: Toll Number: 303-248-0285 Or International Toll-Free Number: http://www.readytalk.com/intl 3. Enter the 7-digit access code 7911212, followed by “#”

For more information on ReadyTalk, visit http://www.ecs.es.net, call 800-333-7638 For web conference: To begin your web conference: 1. Go to: http://esnet.readytalk.com 2. Enter the 7-digit access code 7911212On Oct 18, 2012, at 8:09 AM, Carlos Salgado wrote: JLAB-PWA Meeting

MINUTES

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11/30/12

++ We finished the discussion of AmpTools with Ryan (we started last meeting) . The AmpTools software is working at JLab, instructions for installation are in the PWA-JLAb wiki We also tried the GPU version - You need a special account at JLab (ask Sandy) to use with GPUs and to write your amplpitudes using CUDA.

- We are planning to use AmpTools to analyze g12 data (3pi neutral...) We plan to discuss available data for doing other tests in next meeting.

- Mike P. and Ron W. are working in two different models to incorporate baryon vertices into the meson analysis using SAID fitted amplitudes and the AmpTools structure. We will also plan in working on that software as soon as these models are available.

- We will have then three PWA to compare: our standard (no baryons - kinematic cuts), and two more with two different ways to couple SAID amplitudes to the meson amplitudes.

See you on 12/14/12 last meeting of the year.

-Carlos

Friday, November 16

Agenda -

1. Trial forum site: https://ampweb.jlab.org
2. Tutorial on AmpsTools (R.Mitchell)

JLAB-PWA Meeting

MINUTES

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11/16/12

-Sorry that we have some problems using EVO. We ended using ReadyTalk, perhaps working better? I will send you before next meeting new information on how to remotely connect.

-Ryan Mitchell gave us a tutorial on how to use AmpsTools based in the Dalitz example. version 0.5 was updated few hours before the meeting and it is the version preferred (you can get the software from http://sourceforge.net/projects/amptools/ and see wiki on how to install: https://wiki.jlab.org/pwawiki/index.php/Main_Page

Due to a late start (EVO problems) Ryan will need to continue the tutorial next meeting (11/30/12). (thank you Ryan!) Prepare more of your question and exercise on the Dalitz example for next time!

-Carlos

Friday, November 2

Agenda -

Baryon contamination on PWA.

Minutes

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11/2/2012

Present at JLab: Dennis W., Mike P., Yi Q., Mark I., Carlos S. by Phone: at GWU: Diane S. and Ron W.

We continue our discussions on Baryon Contamination:

Last meeting we decided to compare different methods of attacking the problem.

Today we focussed on expanding our PWA model to include baryon amplitudes (derived from fits to the data). We plan the following tasks:

We will use the AmpTools software to include the SAID baryonic amplitudes in an overall (including mesons and baryons) partial wave analysis of the neutral 3-pions systems (pi+pi-pi0) in photoproduction. We will analyze g12 data and also study simulations (for Gluex and CLAS12) to test our model.

-First steps: will be to install at JLab AmpTools (will be nice a tutorial session by Ryan ?). -Get the relevant baryon vertex amplitudes from SAID (hopefully with Ron's help) -Produce our PW model and Likelihood function (we might use GPUs- depending on effects in normalization integrals, i.e. computer times). This exercise will produce a PW generator.

We will, first, use this model to study the angular effects of introducing the baryon amplitudes, for example in kinematic (angular) cuts, moments ...

All attending agree to work in this problem! .... and report progress in two weeks.

-Carlos