Feb 9 Collaboration-Wide Email: Approval, Feb 17 Meeting, Students and Postdocs

From APEXwiki

Dear all,

We have three announcements to make regarding APEX (PR-10-009, now E12-10-009). In summary (see below for elaboration):

• 1) The experiment was conditionally approved (by PAC 35), so we're

going to request a short pilot run (not to interfere with existing experiments and schedule) to address the conditions outlined by the PAC.

• 2) We've scheduled a collaboration meeting for February 17 to discuss

the feasibility of running in June.

• 3) We'd like to ask if there are any students or postdocs interested

and available in analyzing data gathered in a June pilot run?

This email has been sent to all of the signers of PR-10-009 to the best of our knowledge. If we missed anyone, or if you'd like to be removed from this mailing list, please inform us.

1) Conditional approval.

The TAC report raised questions concerning the tolerable rate of operation of the HRS spectrometers as well as the achievable angular resolution. The PAC approved the experiment on the condition that we address these concerns.

To demonstrate the feasibility of the experiment, we have requested a short pilot run in June. The purpose of the pilot run is to test equipment operation at high event rates and beam intensity, to check QED trident and background rates, and collect data in the electron-positron invariant mass range from ~100-300 MeV to demonstrate our analysis techniques and perform a search for light vector resonances.

A draft of the proposed test run plan, associated tasks, and schedule will be circulated shortly.

2) Collaboration meeting February 17.

To prepare for a possible pilot run in June, the agenda for the meeting includes discussion of HRS and septa optics, VDC data analysis and electronics, target design and construction, angle surveying, the run plan, and a possible discussion of the PAC review and conditions.

We have booked a room for JLab participants, and will provide details on how to join the meeting remotely. We've also setup a web page where you'll find introductory material on the experiment, as well as a preliminary agenda for our first meeting. The web page is at (soon to be moved to a JLab URL) http://ntoro.stanford.edu/apex/

3) Preparing for data analysis.

Students or postdocs interested in data analysis for the pilot run are encouraged to email Bogdan Wojtsekhowski (bogdanw _AT_ jlab.org).

We look forward to meeting all of you soon.

Thanks and best regards,

Rouven Essig

Philip Schuster

Natalia Toro

Bogdan Wojtsekhowski