[Clas12_verystrange] Meeting minutes: FMT in or out?

[Lei Guo]

Thanks Yuri, this is very important information. Please keep us updated about any new development. It would benefit us if we can have better vertex determination without suffering momentum resolution. Let’s hope that will be the case.

Lei

Sent from my iPhone

> On Jul 20, 2018, at 8:53 PM, Yuri Gotra <gotra at jlab.org> wrote:
> 
> Dear Lei,
> 
> We talked with Veronique and Harut about it today. What has been shown is not the final result yet. Veronique showed me that momentum resolution is practically unchanged so this argument is questionable. Veronique and Raffaella are doing more studies and should be able to report prior to Latifa's meeting. It might be useful to hear it at Tuesday's meeting prior to making a decision.
> 
> We agreed yesterday that the group does not have enough time to do a thorough analysis to support or object this evidence.
> 
> Wrong decision ether way would affect the data quality. At this point I do not see that arguments against FMT are definitely heavier than the ones supporting it.
> 
> There is no much scattering through the active zone of the FMT. Saclay group is replacing the metal support bars with light plastic to reduce material budget. They are also considering of installing less disks. Forward tracking can benefit from the alignment done using the FMT data. Better Z vertex resolution would help matching forward and central tracks.
> 
> 
>> On 7/20/18 4:44 PM, lguo wrote:
>> Dear All,
>> 
>> At yesterday’s meeting, we discussed whether we want to keep FMT in or out. The consensus was that even though the vertex resolution might be somewhat impacted negatively by removing FMT, the effect is tolerable based on what we learned from prior simulations. However, keeping FMT in could impact the momentum (angles) resolutions (See Veronique’s talk at the software meeting last week) that likely would impact us more and result in more background that what we could gain from it. Therefore at this point we would tentatively support the proposal to not install FMT for the upcoming Fall run, at next weeks RGA meeting. However, this is based on the information we have up until yesterday. If anyone objects and has evidence/argument to suggest otherwise, please respond ASAP.
>> 
>> Lei
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> 
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