FINAL+PROJECT+OF+THE+YEAR

toc Z events with ee/uu = =

=Different graphs I put up= This is a picture that we have from these events above. This is of the Z particle muons. By using formulas to find the frequency at which the events occur in each bin, I can see obvious peaks around 90 GeV, and then the 3 and 10 Gev for the j/psi and upsilon. This is very exciting to see because we can now use our knowledge of setting up equations in excel and the data to make our own histograms. The next picture shows the same data, but with a gaussian fit on the area that we wanted to see (90 GeV). We also have the electrons from the Z particle, but they are saved on the computer at Quark Net, and so it will be put on tomorrow. We are going to then be looking at the differences between the data, which will be very interesting.



Here is the picture of the data we collected last week of the electrons. What I noticed right away about the two different graphs were the amount of events in each bin. Therefore, we can really see how there are jagged peaks in the muon graph, while with the electrons, it is much smoother. The muons show how there were clearer hits as to how the mass was measured, while the electrons were more "all over the place."

=Main Graphs for comparing= Here are the two graphs, electrons then muons, that have the fits on the curves:





As you can see, both graphs look to be around the same area. What was really interesting was their different values for A,B,C and D. A and D were much different mainly because of the fact that there was a lot more data for the muon peak, and so the height (A) was more and the distance from the bottom of the gaussian to 0 on the x axis was more (D). B is the distance from the y axis to the middle of the gaussian curve, and I find it easier to think of as the average. This shows the average of the Z particle that we are looking at. The muon graph seems to show the Z around 91.82 GeV, while electrons were lower at 89.88. This difference can probably be found by the energies in the particles and where they end up. The electrons are much lower energy and stop in the e-cal, and so there could potentially be particles in the graph that were lower energy that were just picked up because the detector didn't know if it was a electron. On the other hand, the muon has to go through the entire detector, making it harder for the other particles to be mistaken for muons. This is why I think that the average is higher for a muon. C is the width of the curve, and it seems to be very narrow, especially with the muons. After thinking about this, I thought that setting the parameters on the graph is really what shows the peak, and how having more data might make the width larger. Also, the muons seemed to all be around the same GeV with the width so small, and so maybe since muons are very distinct that it was easier for the detector to get data that was closer to each other. The electron width is still fairly small, but with it not being as clean of hits, it is harder to have a gaussian curve with a smaller width.

=Graphs with the j/psi and upsilon data set=

J/psi
j/psi shows how with the data set of 100k, the mass of the particles seemed to be around 3.1. Below is the graph with the gaussian curve. This will show the A,B,C, and D for the curve. A=2124 B=3.116 C=.05125 D=505.8 This set shows how the average of the j/psi is around 3.116, which is very close to the normal GeV of what the CMS is said to be (3.1). The width of the gaussian curve was surprising to me because it seems to be very narrow. I expected the curve to be much more spread out since the GeV is at the lower range.

Upsilon
Here is the graph with the gaussian curve of the upsilon particle. This particle is around 10 GeV originally. This was not was I was expecting. I am not sure why this happened.

=W data= This is the transverse mass of the W electron and neutrino graph. I have been working on trying to get the Z transverse mass up so that we can compare the graphs and find out what the normal mass of the W is. Since the Z and the W compare, we can look at the W/transverse of W= Z/transverse of Z

Z Data muons

W data muons