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Topical Lectures on CP violation

Experimental Discussion Session

M. Merk

N. Tuning

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Why is KL CP violation?

Why is oscillation/mixing pattern different for K, D, B, Bs ?

Why is top quark (heaviest?!) dominant in the loop?

Why can B-factories measure negative decay time Δt?

What is better for B-physics: e+e- or pp ?

Find the difference: vs

What is this triangle?

Is there a problem (charged Higgs?) with Vub?

Why is lifetime different for Bs0

H vs Bs0

L, not for B0H vs B0

L?

What are kaons?

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Cronin & Fitch

• Why is the detection of 2 pions CP violation?

– Fraction of KS is CP- , and decays to CP- final state …

• What about regeneration?

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Why such different pattern?

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Why is the top quark dominant in the loop?

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Why is the top quark dominant in the loop?

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B-factories (e+e-)

• What is that x-axis Δt ?

• How can that be negative ?

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Pro’s and cons: Babar vs LHCb

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Pro’s and cons: Babar vs LHCb

• B cross section: 1 nb vs 300 ub– Luminosity: 1 ab-1 vs 1fb-1

• Tagging: 5% vs 50%

• B vs Bs

• Proper time resolution

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Pro’s and cons: Super-Belle vs LHCb upgrade

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Why (no) asymmetry here?

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B+D0K+

D0K+

bc favoured

bu suppressed

BiBr e K-π+K+

Cabibbo supp.

Cabibbo allowed.

DiDr e

Unitarity Triangle?

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Vub?

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Vub?

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|Vub| from B→τνFrom: H.Lacker, and A.Buras, Beauty2011, Amsterdam

|Vub| from fit

|Vub| avg from semi-lep

ΔΓ vs ΔΓs ?

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What are kaons ?

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• Different notation: confusing?

K1, K2, KL, KS, K+, K-, K0

It depends…: It depends…: Flavour eigenstate Mass/lifetime eigenstate CP eigenstate