Quarks Flashcards
How is charge written in terms of isospin & hypercharge?
What is the equation for hypercharge?
How do the following symmetry operators act on the following quantum numbers?
How are CP eigenstates defined (using mesons as an example)?
What is the table of existing mesons relative to quark content?
How do the Cabibbo & CKM mixing matrices act on quarks?
How does the Wolfenstein parameterisation of the CKM matrix appear (up to 3rd order)?
Draw the two box diagrams that cause meson mixing, using neutral kaons as an example.
How do we define meson mass eigenstates?
State the condition for CP violation in mixing.
What is the function responsible for meson mixing?
Define all terms in the function.
What is the condition for meson mixing to occur?
For meson mixing to occur, either (x) or (y) must be non-zero.
What are the following probabilities of meson mixing occuring, in terms of the meson mixing function?
What are the following meson average lifetimes?
What is the asymmetry term for CP violation in decays (in terms of both decay channels and the strong & weak phases)?
What are the decay amplitudes in terms of the leading-order and suppressed amplitudes?
(HINT: define the ratio, strong & weak phases).
What diagram represents the impact parameter used in heavy flavour tagging?
What diagram represents B-tagging, and what do we measure in opposite/same-side tagging?
- Opposite : follow the b-charge as it decays in leptons or kaons, then trace back to find the root
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Same-side : Search for flavour pairs (e.g. u and ū).
Note : neutral B-mesons can oscillate & produce false tagging.
What are tree-level colour allowed & supressed decay diagrams (use the neutral D-meson as an example)?
What is a W-exchange diagram (use netural D-meson decay as an example)?
The leading order diagram where both quarks change flavour.
What is a gluonic penguin diagram (use neutral D-meson decay as an example)?
A decay with a W-loop and gluon pair production.
What is an electromagentic penguin diagram (use neutral D-meson decay as an example)?
Contains a W-loop and photon/Z-boson pair production.
What is a meson annihilation diagram?
Note: heavily colour suppressed.
What is the systematic uncertainty mitigation for CP amplitudes?
What is the Dalitz plot for finding mass pairs?
It tells you the masses of resonances in decays
How do we measure CP violating mixing asymmetrys?