Andrew Wagner SASS Presentation Wednesday April, 23 2008 · 2008. 4. 23. · SASS Presentation...

Andrew Wagner

SASS Presentation

Wednesday April, 23 2008

Andrew Wagner An Overview of BaBarOutline

• What is CP Violation? For That matter what are C and P?

• Why do we care?

• A strategy for measuring the CKM Triangle

• What’s in a Mixing?

• Building the Elephant

• Making the Measurement

Slides thanks to Jeff Richman and the BaBar collaboration

Andrew Wagner An Overview of BaBar

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The Discreet Symmetries C,P,T

If both C and CP are violated then there is a real difference between matter and anti-matter.

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Andrew Wagner An Overview of BaBar4

CP: A worked Example

Origin of CP-violating phases in the Standard Model:

Quark Couplings in W-mediated processes

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Universal weak coupling g

must be multiplied by

element of CKM matrix Vij.

CP Violation in Weak Interactions

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The World’s Most Expensive Protractor

Particle Man ... Universe Man ...

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Weak interactions is only enough to account for the

amount of matter in one galaxy!

BaBar Physics Goals (not comprehensive)

• Measure the CKM angles as redundantly as possible. Are all measurements consistent? Does the CKM triangle “close”?• New Physics searches in rare decays. • Recently exotic searches at and for other resonances.

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How do you measure the CKM angles?

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CP Violation in Mixing and Decay

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The key quantity in these CP asymmetries is:

CP Violation in Mixing and Decay

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Weak transitions underlying B0 B0 oscillations

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B0 and B0 spontaneously evolve into each other. More precisely, a

particle that is initially a B0 evolves into a superposition of B0 and B0 .

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The Phase of Mixing

Weak transitions underlying B decay (II)

Hadronic decay:

- “Internal” spectator diagram

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with ext. spectator diagram.

Hadronic decay:

- Gluonic penguin diagram

- Many such modes have now

been observed! BF: 10-6-10-5

- Loop diagrams are

suppressed in SM! good

place to search for new

physics amplitudes.

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Tree: internal spectator

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The Phase of Decay

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Measuring the CKM Angles

Building the World’s Most Expensive Protractor

• Need to measure the time difference between the decays of VERY short lived particles (~ 1.5 ps) accurately. • Need to reconstruct decay products with low mis-ID

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B and Anti-B Asymmetric Rings

Anatomy of an Elephant

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Installed SVT Modules

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Better Know a Vertex Tracker

I Like Mike

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The CKM Triangle all measured up

How many people does it take to make a pantomime Elephant?

Andrew Wagner SASS Presentation Wednesday April, 23 2008 · 2008. 4. 23. · SASS Presentation...

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