École de GIF 2025 : les futurs collisionneurs et leur physique

Enquête

QCM - Cours Higgs and electroweak physics

Which is the energy of the beam in a fixed-target experiment which would result in the same centre of mass energy as LHC (take E_LHC=14 TeV) ?(consider interaction of the beam on protons of the target)*

9.8 TeV

98 TeV

98 000 TeV

Why don’t we collide protons with anti-protons at 14 TeV in the LHC ?*

the proton-antiproton cross section is lower that proton-antiproton cross section

the luminosity of a proton-antiproton LHC would be poor

antiprotons would annihilate with the matter of the beam pipe

How many proton-proton collisions does the LHC produce per second (assuming L_LHC = 2*10^34 cm^-2 sec^-1 )?*

2 millions

20 millions

2 billions

20 billions

How can one estimated the expected number of pile-up events ?*

from the instantaneous luminosity, the p cross section and the bunch crossing length

from the integrated luminosity, the p cross section and the bunch crossing length

from the p cross section and the bunch crossing length

Does the Higgs boson couple to photons?*

Yes, the Higgs boson couples directly to all gauge bosons

Yes, but only through quantum loops including charged particles

No, photons are massless and do not couple to Higgs bosons

Which were one of the main key channels used to discover the Higgs Boson?*

H --> bb because very abundant

H--> ZZ because very clean

H --> WW

How many Higgs Bosons have been produced in Run 2 ( L = 140 fb-1 )*

0.84 M

8.4 M

84 M

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