July 29, 2013, Physics Working Group

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Meeting Time and Place

The meeting will be on Monday July 29, 2013 at 11:30am EDT. For those people at Jefferson Lab, the meeting will be in room F326.

Meeting Connections

To connect from the outside:

1.) ESNET:

   Call ESNET Number 8542553 (this is the preferred connection method).


   A conference has been booked from 11:00am until 1:00pm (EST).

3.) Phone: (should not be needed)

  +1-866-740-1260 : US and Canada
  +1-303-248-0285 : International
     then use participant code: 3421244# (the # is needed when using the phone)
   or www.readytalk.com
     then type access code 3421244 into "join a meeting" (you need java plugin)


  1. Announcements
  2. Discussion on important/interesting channels to be studied
    1. Implementation of code associated with these (DReaction classes)?
  3. Simulation of excited strange baryons (S = -1): hyperon vertices (Kei)

Notes from Meeting

1. Discussion on important/interesting channels to be studied The table that Volker put up is only for those channels that people have said they would do (you cannot "claim" an analysis channel).

We need more people working on the specifics of each channel, as each channel has its own difficulties. We may want to add the channels that are important for the pion polarizability and rare eta decay experiments.

2. Organization of analysis channels, wiki Paul will organize the analysis section of the wiki page, and we will have a table of ongoing analyses. People will also be encouraged to submit their analysis code into the repository so that other people can see what has been done.

3. Secondary vertices Kei gave a talk on reconstructing secondary vertices in gamma + p -> K+ Lambda(1670), Lambda(1670) -> Lambda eta. The secondary vertex of the Lambda is reconstructed rather well when the 8-C kinematic fit works. A 1% kfit CL cut reduces the reconstruction efficiency to ~2%.

(note: there was a typo in slide 8 where the generated number of events are shown. The number shown is the TH1F::Integral() after scaling down to have the same height as reconstructed. The generated number of events was 389k, and the acceptances shown are correct.)

Kei will continue studies of Lambda vertices, with possible future extensions to Sigma+ -> p pi0 and Cascade vertices.