# Higgs boson re-discovery from a CERN dataset (for a project)

• omerel
In summary, the speaker is working on a seminar project about elementary particles and is trying to rediscover the Higgs boson from a dataset obtained from CERN. They are struggling to understand how to identify the gap in the invariant mass diagram around the Higgs boson mass of 125 GeV. The speaker has watched CERN's official video on the Higgs discovery and has looked at code implementations, but is still unsure how to see the gap around 125 GeV. They have also plotted histograms of Z boson invariant masses, but have not seen anything unusual. They are asking for more information on the dataset and the analysis methods used. They also mention that one Z boson is off shell, so it cannot be included in
omerel
Homework Statement
Seminar Project
Relevant Equations
H -> ZZ -> 4l (muons)
Hi everyone!
I'm working on a seminar project on elementary particles, and I'm supposed to introduce the LHC and rediscover the Higgs boson from a dataset I got from CERN open source.
I don't understand how am I supposed to discover the gap (in the invariant mass diagram) around the Higgs boson mass (125 GeV).
I've watched CERN's official video on the Higgs discovery (Higgs boson decay to two photons), and several code implementations relevant to my problem (H->ZZ->4l) and couldn't understand the idea of how you actually see the gap around 125 GeV?
When I plot the histogram of Z boson invariant masses, I do not see anything unusual.
For your convenience, I attached two of my histograms- one for Z boson pairs invariant mass (i.e came from the same decay) and the second is the invariant mass of a single Z boson invariant mass. The invariant mass is in GeV units.

#### Attachments

• single.PNG
4.7 KB · Views: 81
What is this gap you are talking about?

What is the dataset you are looking at? Is it big enough to see the Higgs? The Z peak seems awfully small.

Can you provide more information on how you analyzed the data? E.g. cuts used and so on. Also provide a link to the dataset

One Z is off shell so you can not write "invariant mass of two Z" here

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