Graphs+and+other+information+on+the+mastercl

2/2/12 The question that we were left to think about last time we met was exactly how can we tell the difference between muons and electrons just from looking at a data set? After pondering the question, I don't know if you can find out if there are two muons or two electrons just by looking at an excel spreadsheet. If you used the visual detector, you can easily see the difference between the electrons and muons (muons go all the way through the detector while electrons deposit all of their energy in the E-cal after showing in the tracker. I think if we added more columns into our sheet in excel, we might be able to see what lepton particle it is. I think if we could calculate the amount of hits in the detector, or if we could find the mass of the particles, we might be able to tell the difference. I know that finding the amount of hits in the entire detector would show whether or not it was an electron or muon because the more hits, the more likely it could be a muon. I do not know if there is a big difference between the masses of the two particles, but I feel like muons would be lighter. I also thought about adding the hits in the barrels past the E-cal, but I figured that if there wasn't any hits at all, we would know right away that it was a moun instead of an electron, and I don't think we could get a column to do this.

This is what the students are working on for the Masterclass. This spreadsheet shows the calculations that they will need to do for finding out the J/psi and Z particles (forming around 90 GeV)

I uploaded my data set to many eyes,

This shows the values of delta phi, which is centered around 3.14 (straight up in the z direction.) This shows that the muon or electron tracks are canceling each other to get around pi.

This histogram shows the momentum of t, which is related to the transverse mass of the particle. I find it interesting that most of pt is close to zero, and that there is a peak around 40. i think that this might be because pt2 is half of the original momentum, and so when it splits in half (originally 90 GeV), the mass would be around 45 GeV.

An example of this is the graph below that has almost all the particles around 0. I think that this shows how the collision didn't create a lot of high energy particles.
 * When I went through all of the graphs that I uploaded, I noticed in the histograms that there was a lot of very low Energy particles. Because of this, most of the particles stay around 0, like px1,px2,py1,py2, and pz1,pz2.



Here is an awesome Histogram showing the first few hundred events in our data set. These are the Z particles.

Here are the 500's for the Masterclass:

Here are the 700s: