Abstract

These notes overlap with lectures given at the TASI summer schools in 2014 and 2011, as well as at the European School of High Energy Physics in 2013. This is primarily an attempt at transcribing my hand-written notes, with emphasis on topics and ideas discussed in the lectures. It is not a comprehensive introduction or review of the field, nor does it include a complete list of references. I hope, however, that some may find it useful to better understand the reasons for excitement about recent progress and future opportunities in flavor physics.

Highlights

  • IntroductionWHAT: There are six different types of quarks: u (“up”), d (“down”), s (“strange”), c (“charm”), b (“bottom”) and t (“top”)

  • What/Why/How?WHAT: There are six different types of quarks: u (“up”), d (“down”), s (“strange”), c (“charm”), b (“bottom”) and t (“top”)

  • We have found a tree level contribution, L(6) = −gGUT

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Summary

Introduction

Recall that we left open the question of how to include g in X 0 -X mixing, since we computed in terms of the matrix element hX 0 |O|X i of a local operator O. We never quite justified properly why we can use a local operator instead of a time ordered product of interactions in the electro-weak. We mentioned a related problem, how to deal with the scale uncertainty, that is, how to choose between, say, αs (MW ) and αS (mK ). We’ll address these problems in this chapter. If we could compute non-perturbatively, or at least perturbatively to all orders, we would use αs (μ) for the coupling, with an arbitrary renormalization scale μ, together with λU,D (μ), g1,2 (μ). This is the content of the renormalization group equation (RGE), which we will use extensively

ONCE MORE ON FLAVOR SYMMETRY where c12 s12 0
GIM-MECHANISM
FLAVOR THEORY
CHAPTER 2. NEUTRAL MESON MIXING AND CP ASYMMETRIES
G F MW
CP-ASYMMETRIES
INTUITIVE EFT
CHAPTER 3. EFFECTIVE FIELD THEORY
BEYOND TREE LEVEL
RGE IMPROVEMENT
Operator mixing

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