[Hadstruct] Minute/next meeting...

[David Richards]

Dear All,

One trouble about not writing the minutes in real time is that I forget things….  One important point - several of us have a conflict tomorrow at 930am, so it was agreed our next meeting would be FRIDAY 16TH OCT at 11AM.

Regards,
David

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Disconnected Code

ER reported on the progress at implementing the disconnected code,DISCO, which had been built and tested at JLab. KO noted that it was important to do a complete two-point and three-point run to explore the resulting precision of the calculations. The disconnected contributions might be expected to be particularly important at large Ioffe time <-> small Bjorken x. One topic that was noted was that, if we computed the strange-quark perambulators, then we could extend the study from the pion to the kaon, where there was a lot of interest in, e.g. the large-x behavior of PDFs. On a related matter, we should also computed the strange-quark disconnected contributions, to get a handle on the strange-quark contents. We noted in particular that we had a large amount of time available on the RTX nodes at JLab (quick note from DGR - my throughput at getting jobs to run has been slow!).

Analysis of PDFs on 48^3 lattices

CK presented his preliminary analysis of the data generated in Europe, and comparing the plateau and ratio methods. The data was generated using th "sub-optimal" (but still correct!) smearing code. The data cam from separations up to 12 time slices - the data at t=14 was incomplete. However, it appeared that the data at t=12 was sufficiently noisy that is was more important to ensure that data was saturated rather than attempting to generate further data. Further (phased) runs would be performed with the "optimal" smearing values.

Gauge generation

TK was generating the configs on the 32^3 lattices at the lighter pion mass, and there was some discussion as to the optimal parameters - in particular, BJ noted to ensure that the multigrid option was used, even if the impact at this somewhat large pion mass might be small.

AOB

DGR noted that there was a conflict at our usual time next Wednesday 14th at 9am which would mean several of us would have to leave at 930am. Therefore:

Next Meeting

Friday 16th October, 11am