35,677 research outputs found
CP Violation
Several pieces of direct and indirect evidence now suggest that the
Kobayashi-Maskawa mechanism plays a distinguished role for CP violation at the
electroweak scale. This talk provides a general overview of CP violation in its
various contexts, emphasizing CP violation in flavour-violating interactions,
such as due to the Kobayashi-Maskawa mechanism. I then review a few recent
theoretical developments relevant to the interpretation of CP violation.Comment: 27 pages, LaTeX; plenary talk presented at the International
Europhysics Conference on High Energy Physics, Budapest, July 2001;
manuscript has some overlap with hep-lat/020101
CP Violation
An overview of the phenomenology of CP violation is presented. The Standard
Model mechanism of CP violation and its main experimental tests, both in the
kaon and bottom systems, are discussed. (Lectures given at the 1993 Trieste
Summer School and at the Escuela Latinoamericana de Fisica, ELAF'93,
Argentina).Comment: 29 pages, LaTeX (4 figures not included), CERN-TH.7144/9
CP Violation
Three possibilities for the origin of CP violation are discussed: (1) the
Standard Model in which all CP violation is due to one parameter in the CKM
matrix, (2) the superweak model in which all CP violation is due to new physics
and (3) the Standard Model plus new physics. A major goal of B physics is to
distinguish these possibilities. CP violation implies time reversal violation
(TRV) but direct evidence for TRV is difficult to obtain.Comment: 13 pages, to be published in Lecture Notes of TASI-2000, edited by
Jonathan L. Rosner, World Scientific, 200
CP violation and modular symmetries
We reconsider the origin of CP violation in fundamental theory. Existing
string models of spontaneous CP violation make ambiguous predictions, due to
the arbitrariness of CP transformation and the apparent non-invariance of the
results under duality. We find an unambiguous modular CP invariance condition,
applicable to predictive models of spontaneous CP violation, which circumvents
these problems; it strongly constrains CP violation by heterotic string moduli.
The dilaton is also evaluated as a source of CP violation, but is likely
experimentally excluded. We consider the prospects for explaining CP violation
in strongly-coupled strings and brane worlds.Comment: 6 pages, REVTeX 4b5+amssymb. 2 references added, substantially the
same as published versio
CP Violation in SUSY
Supersymmetry exhibts new sources of CP violation. We discuss the
implications of these new contributions to CP violation both in the K and B
physics. We show that CP violation puts severe constraints on low energy SUSY,
but it represents also a promising ground to look for signals of new physics.Comment: 10 pages, 2 figures. Invited talk by A. Masiero at Ferrara 2000, CP
violation physic
Fast CP Violation
flavor tagging will be extensively studied at the asymmetric
factories due to its importance in CP asymmetry measurements. The primary
tagging modes are the semileptonic decays of the (lepton tag), or the
hadronic decays (kaon tag). We suggest that looking for time
dependent CP asymmetries in events where one is tagged leptonically and the
other one is tagged with a kaon could result in an early detection of CP
violation. Although in the Standard Model these asymmetries are expected to be
small, , they could be measured with about the same amount of data as
in the ``gold-plated'' decay . In the presence of physics
beyond the Standard Model, these asymmetries could be as large as ,
and the first CP violation signal in the system may show up in these
events. We give explicit examples of new physics scenarios where this occurs.Comment: 9 pages, revtex, no figures. Discussion of new physics effects on CP
violation with two lepton tags expanded. Factors of 2 correcte
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