[clas_members] [EXTERNAL] Recalibration / recooking prioritisation exercise

[Bryan McKinnon]

Dear Run Group Coordinators (all other members for information)


With many run groups having thoughts, and making progress towards, further rounds of calibrations and reconstruction, we are writing to provide context and outline the initial steps that the CCC will be taking in order to bring a more formalised structure and approach towards this process. Primarily the aim is to avoid premature recalibration requests that could result in repeated passes, and to ensure that CALCOM is fully supported in its decisions requiring prioritisation of recalibration and recooking.

We need to be mindful that ongoing improvements in calibration and reconstruction are consolidated before initiating new recalibration requests whilst also recognising that this is an optimal time to focus on preparations and recalibrations given that CALCOM now has availability, with RG-L (FD) efforts concluding and no new CLAS12 running in 2026.

During the November collaboration meeting, there will be a dedicated session in which run group coordinators will present the status and supporting case for future recalibration and recooking. These reports will then lead to subsequent discussions of physics-driven priorities and realistic timelines. The intended outcome is for the CCC to establish a broadly agreed priority ordering of recalibration/recooking.

In order to make some initial progress, we are asking you to give thought towards the following questions, the answers to which should be presented during the meeting session:

- What is your available person-power, for example: a chef and coordinator who will follow the process in its entirety; students or postdocs to analyse and assess the data quality and perform validation studies, are any new analyses expected to be triggered by the process?

- On what preferred timescale do you envisage recalibration/recooking of your data to be of most use, for example to maintain a current standard between data sets or to wait for future additional improvements?

On the part of the CCC/CALCOM, we will circulate a status document containing current and near-future improvements to calibrations and reconstruction including any remaining open questions or caveats. This document will be circulated on a timescale coinciding with the collaboration meetings  and run group coordinators will be asked to address an additional question, during the discussion session, based on this:



- Which of these improvements would your run group most benefit from to produce higher quality physics output based on the new data set?


Efforts in producing well calibrated and processed data sets is in all of our best interests and must be coordinated within the collaboration as a whole. Your input will be critical to ensure the efficient use of resources and maintaining consistent standards across run groups.


Many thanks and regards

Bryan (on behalf of the CCC and CALCOM)

___________________________________

Dr. Bryan McKinnon

Nuclear and Hadron Physics Research
School of Physics and Astronomy
University of Glasgow
Glasgow
G12 8QQ
UK
___________________________________
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/clas_members/attachments/20250930/79fb39e2/attachment-0001.htm>