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#### RE: Citizen Science Episode 4

in STEMGeeks2 months ago

Thanks for this report. You were the fastest! Please find below a few comments and some suggestions. Feel free to come back to me in a second stage.

I have a red color because i made a little mistake while importing but it doesn't change anything in the results.

Actually, the red colour is very nicely looking (and better than the blue).

The homework consist in doing the same exercise for Jets (j) and B-Jets (b) with a different value for the cleaning: 25 GeV

Whereas what you did was correct, do you think that a histogram with 5 bins is appropriate for the jet multiplicity distribution? The answer can be found on the webpage generated by the code.

For the question of the little variation, maybe we would have a greater with a greater value than 25.

Indeed! Have you tried out to see? There is a physics reason here, related to the origins of the b-jets. I won’t give the answer now, but don’t worry it will come later. For now, I only give clues ;)

As we selected N (l) = 1 the result after the cut is in accordance, we have only the selected bar.

That’s correct! This proves that the code does what it is supposed to do (without much of a surprise).

Here I had to update Ma5 because i had errors in the output so I entered:
[…]
I'm not sure if the last lines were necessary but in doubt.

In fact, the definition of the `l` symbol is necessary, as you use it afterwards. However, there is no need to re-plot the NAPID distribution, which you already studied. In any case, this does not hurt, so it is fine. You are just burning some extra CPU power ;)

ma5>plot PT(j[1] j[2]) 25 0 250 [logY]

Here, you plot in fact the distribution in the transverse momentum of the system made of the two hardest jets. By doing so, you assume that these two objects arise from the decay of a more massive guy, and then you plot the distribution in transverse momentum of this massive mother particle.

Whereas this may be something useful (as the two light jets often originate from a W boson), this does not answer the question. I will let you think further on this one before providing clues ;)

Cheers, and thanks again for your participation!

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Merci pour ce retour,
je pense que je reprendrai du début avec cet éclairage dans quelques jours quand j'aurai l'esprit plus disponible.

Pas de soucis ! Prends ton temps. Je compte sortir l'episode 5 dans une dizaine de jours (et les solutions en fin de semaine prochaine).