The meeting was attended by 

 Millnd Diwan <diwan@bnl.gov>, "Marciano, William" <marciano@bnl.gov>, "Qian, Xin" <xqian@bnl.gov>, Hooman Davoudiasl <hooman@quark.phy.bnl.gov>, "Tricoli, Alessandro" <atricoli@bnl.gov>, "Denton, Peter" <pdenton@bnl.gov>, "Carini, Gabriella" <carini@bnl.gov>, "Assamagan, Ketevi" <ketevi@bnl.gov>, "Begel, Michael" <begel@bnl.gov>, "Nomerotski, Andrei" <anomerotski@bnl.gov>, "Stewart, James" <stewart@bnl.gov>, "Asner, David" <dasner@bnl.gov>, Jonathan Lee Feng <jlf@uci.edu>, Maria Vittoria Garzelli <garzelli@mail.desy.de>, Felix Kling <felixk@slac.stanford.edu>,"Bishai, Mary" <mbishai@bnl.gov>


1)  Felix will take us through the plots of BSM sensitivities for the forward physics scenarios.  
The slides are attached.  

2)  Let’s also discuss the workshop on May 27-28.   
     In particular, we should consider how to think about the scientific requirements for the facility.  
     What are the scientific goals ?   How do those goals influence the detector that people would like to have ? 


Some questions and follow up.  

Mary: 
I have a very naïve question – on slide 7, I would have expected lepton universality to apply to all 3 flavor CC interactions at 1 TeV, but the nutau still appears lower than the numu and nue. Are there some significant FSI/nuclear effects that are causing a reduction in the xsec? I note the calculation is done on Tungsten which is a very heavy nucleus.
 
Felix: 
Yes, you are right. Lepton universality should (at least approximately) apply to all three flavours at 1TeV. For this estimate I have used the cross section from our FASERv letter of intent (https://arxiv.org/abs/1908.02310).  I attached the relevant figure below. We can see that the tau neutrino cross section should be O(10%) smaller than the muon neutrino cross section, which is what we also  see in my slides. So that seems consistent. 
Also note that in my slides, I am showing the average of the neutrino/antineutrino cross section. However, this is not what we would measure, since the fluxes are not fully symmetric, especially at the highest energies. We should think about a better way to display these sensitivities, but I think the plot already gets the main points across. 

Denton: 
One could define a FASERnu weighted average that is whatever the average is at the LHC. When other experiments measure a different weighted average one could then translate them or keep them the same and label them correctly or whatever.