00:57:38 Andreas Kronfeld: Does BMW include the Naik term? Fermilab/HPQCD/MILC do, Aubin et al. do not. 00:58:15 Zoltan Fodor: No, BMW does not have Naik 00:58:26 Rainer Sommer: from what i know they do not. they smear. 00:59:26 Silvano Simula: I have a comment 01:01:04 Christoph Lehner: Just a comment since you did not mention it: https://arxiv.org/pdf/2003.04177.pdf also has a window result on the FNAL/MILC ensembles which seems to agree with what you found. It does not use staggered chpt as well 01:03:57 Andreas Kronfeld: @Rainer: everybody smears: BMW uses (more than 1) stout, the others the smearing in HISQ 01:08:57 Rainer Sommer: Without using chi-PT, how does one actually separate taste breaking effects from general a^2 effects? 01:09:44 Christoph Lehner: One extrapolates both away 01:10:08 Christoph Lehner: So no separation 01:10:16 Maarten Golterman: So you don’t separate them. I don’t know of a way to do that without ChPT. 01:10:26 Aida El-Khadra: One doesn’t need to separate them. Taste-breaking effects are formally the same order as generic disc effects 01:11:04 Rainer Sommer: @Christophe: I understand this, but there seems to be a discussion about just the taste breaking part. That is my confusion. 01:12:10 Maarten Golterman: It is possible to separate taste breaking effects because we have SChPT. 01:14:15 Gilberto Colangelo: @Maarten: that is exactly my question: do we know that SChPT works for a quantity like a_mu? 01:16:00 Gilberto Colangelo: Meaning: we now that in the continuum you do not want to apply ChPT to a_mu, so can it be used to calculate just these effects for a_mu? 01:17:36 Aida El-Khadra: One needs to show that the cont limit is the same, if adding taste-breaking effects via SChPT or not adding them. 01:25:09 kmiura: We explicitly know that the main taste breaking is from heavier pions, and the SChPT can pick up those effects. 01:26:43 Maarten Golterman: @Gilberto: I think so, because one can think of taste breaking as a long-distance effect (somewhat counter intuitively). 01:28:47 Zoltan Fodor: @Gilberto we do not calculate a_mu, we just calculate one contribution to the mass dependence in the long distance region 01:56:51 Gilberto Colangelo: @kmiura, @Maarten, @Zoltan, thanks for your replies. I think we agree on the principle, that you can use SChPT to describe long distance effects only. Whether this is sufficient to correct for taste breaking effectsit's not completely clear to me. 01:58:31 Ruth Van de Water: @Gilberto, I think that the point is that — even if you mess up the taste-breaking corrections a bit it doesn’t matter because you then remove any remaining discretization effects via the continuum extrapolation. 02:01:07 Christoph Lehner: We will re-convene at 4:35 CET 1st Break 02:19:26 Andreas Kronfeld: Please do _ I've been double- zooming since 9:00 and just got back. 02:19:45 Andreas Kronfeld: LQCD + Kogut 02:23:41 kmiura: @Gilberto: I do not have a complete answer. But it is natural to expect the largest taste breaking effects are from the pion sector. Taste breaking spoils Goldstone nature of 15-pions, and drastically makes them massive, giving the leading taste effects. 02:23:41 Andreas Kronfeld: Sorry, I was replying to a private chat 02:24:54 Laurent Lellouch: question 02:26:41 Jamie Hudspith: This also works (reducing the excited state contamination) by making the sink extended instead for the GF-wall of reducing the wall source size. The same naive argument applies as the Wall-Wall correlator must approach from above. 02:27:59 Gilberto Colangelo: @Kohtaroh: yes, I agree with that, but even the contribution of 2 pions only to a_mu you cannot calculate with ChPT. 02:30:23 Aaron Meyer: I also have a few slides on the Omega 02:30:29 Maarten Golterman: @Gilberto: I believe you can calculate the differences between a_mu’s with different taste splittings in ChPT 02:35:38 kmiura: @Gilberto and Maarten: I agree with Maarten. The philosophy is similar to finite volume effects, which can be evaluated by ChPT. 03:14:45 Christoph Lehner: We re-convene 5:47 03:14:53 Christoph Lehner: CET 2nd Break 03:35:48 Christoph Lehner: I have a comment 03:35:51 Christoph Lehner: but it can wait