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How was the Higgs Boson discovered? (1/n)
The main process which led to its discovery is its decay into 2 photons: ℎ → γ + γ
This process is occurs at "loop level" mediated by the top and bottom quarks 𝑡 & 𝑏
The higgs lifetime is 1.56×10⁻²² spic.twitter.com/A4swAukBBY
Step (1): Smash Protons
The LHC smashes together protons
When two protons collide, it produces a "shower" of its constituent quarks 𝑞 and gluons 𝐺
The 𝐺 can then decay into pairs of t̅t (top, anti top)pic.twitter.com/qPODS9Eid3
Step (2): Higgs Production
These t̅t coming from the Gluon decay, can then interact with one another
These t̅t can then "annihilate" to produce a higgs particle, via the process shown below.pic.twitter.com/Esoe9Ixcg7
Step (3): Higgs Decay to photons
Lastly, now that the higgs is produced it lives out its short life of 1.56×10⁻²² s
At which point it is destroyed by the very process which created it--the t̅t channel
Gone but not forgotten, the higgs waves to us in the form of 2 photonspic.twitter.com/APfqq0dtGr
Putting it all together, we get the leading order Feynman diagram that led to the discovery of the Higgs Boson. 
pic.twitter.com/w9ug4yfJc1
If any of you found these Feynman diagrams useful, and want to use them in a talk or something, you're more than welcome to.
Just maybe remember to tell them to follow @InertialObservr ;)
So did they plot the invariant mass of 2 photons and get a bump at 125GeV? After removing the background?
I think they measured the cross section as a function of CM energy and saw a resonance at 125 GeV
For the γγ channel, we are very lucky the Higgs mass is what it turned out to be, ~ 125 GeV.pic.twitter.com/nnyhCPv2Mv
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