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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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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The World’s Most Expensive Protractor

Particle Man ... Universe Man ...

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'9D)4'64=E%A#'6%*9#D%(4=EA6The Amount of CP Violation in

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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Triangle Man ... Triangle Man ...

How do you measure the CKM angles?

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The Phase of Mixing

Weak transitions underlying B decay (II)

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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

Innermost Detector Subsystem: Silicon Vertex TrackerInnermost Detector Subsystem: Silicon Vertex Tracker

Be beam pipe: R=2.79 cm

Installed SVT Modules

(Bmesons move 0.25 mm along beam direction.)


Better Know a Vertex Tracker


I Like Mike

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The Prestige


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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