CP VIOLATION AT BABAR

2008 ◽  
Vol 23 (21) ◽  
pp. 3273-3276
Author(s):  
◽  
CHRISTOPHE YÈCHE
Keyword(s):  
Cp Violation ◽  
Unitarity Triangle ◽  
B Factory ◽  
Babar Detector

We report recent measurements of the three CKM angles of the Unitarity Triangle using about 383 millions [Formula: see text] pairs collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC.

scholarly journals Exploring CP-Violation Through B Decays

2003 ◽  
Vol 18 (21) ◽  
pp. 1413-1433 ◽  
Author(s):  
Robert Fleischer
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
B Meson ◽  
Model Description ◽  
B Decays ◽  
Unitarity Triangle ◽  
The Standard Model ◽  
B Factory ◽  
Meson System

The B-meson system provides many strategies to perform stringent tests of the Standard-Model description of CP-violation. In this brief review, we discuss implications of the currently available B-factory data on the angles α, β and γ of the unitarity triangle, emphasize the importance of Bsstudies at hadronic B experiments, and discuss new, theoretically clean strategies to determine γ.

CP VIOLATION IN NEUTRAL B DECAYS ON THE ϒ (4S) WITH SYMMETRIC ENERGIES

1995 ◽  
Vol 10 (02) ◽  
pp. 165-172 ◽  
Author(s):  
KARL BERKELMAN
Keyword(s):  
Cp Violation ◽  
B Meson ◽  
Matrix Elements ◽  
B Decays ◽  
Unitarity Triangle ◽  
Statistical Estimator ◽  
Interaction Point ◽  
B Meson Decays ◽  
B Factory ◽  
Neutral B Decays

The favored tests of CP violation in B meson decays give sin 2α and sin 2β, where α and β are angles in the unitarity triangle relating the Kobayashi–Maskawa matrix elements. In the classic B Factory experiment sin 2α or sin 2β is obtained by observing a time dependent CP violating asymmetry in the decay of tagged B0, [Formula: see text] pairs, mediated by [Formula: see text] mixing. The same measurement can be performed at a symmetric energy collider operating at the ϒ (4S) resonance, given sufficient luminosity and vertex resolution. That is, provided the vertical spread of the beam at the interaction point is small, for two-event subclasses the centroid separation in measurements of the observed midpoint between the heights of the two decay vertices is a good statistical estimator for the CP violation parameter sin 2α or sin 2β. With a typical detector the number of events needed is about three times what an asymmetric B Factory would require for the same accuracy.

scholarly journals Study of $B^- \to D^*_2(2460)^0 \pi^-$ and $B^- \to D_1(2420)^0 \pi^-$ Decays

2005 ◽  
Vol 20 (16) ◽  
pp. 3698-3700 ◽  
Author(s):  
◽  
Vance O. Eschenburg
Keyword(s):  
Heavy Quark ◽  
B Mesons ◽  
P Wave ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Preliminary Results ◽  
B Factory ◽  
Babar Detector

We report on a study of B mesons decaying into one of the narrow P -wave charm resonances, [Formula: see text] and D1(2420)0. Our preliminary results are based on 89 million [Formula: see text] pairs collected with the BABAR detector at the PEP-II asymmetric B Factory. Our study will be useful in the investigation of the properties of Heavy Quark Effective Theory.

scholarly journals RARE DECAYS AND CP VIOLATION BEYOND THE STANDARD MODEL

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1738-1749 ◽  
Author(s):  
LUCA SILVESTRINI
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Rare Decays ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Unitarity Triangle ◽  
Minimal Flavour Violation ◽  
The Standard Model ◽  
The Status ◽  
Flavour Violation

We review the status of rare decays and CP violation in extensions of the Standard Model. We analyze the determination of the unitarity triangle and the model-independent constraints on new physics that can be derived from this analysis. We find stringent bounds on new contributions to [Formula: see text] and [Formula: see text] mixing, pointing either to models of minimal flavour violation or to models with new sources of flavour and CP violation in b → s transitions. We discuss the status of the universal unitarity triangle in minimal flavour violation, and study rare decays in this class of models. We then turn to supersymmetric models with nontrivial mixing between second and third generation squarks, discuss the present constraints on this mixing and analyze the possible effects on CP violation in b → s nonleptonic decays and on [Formula: see text] mixing. We conclude presenting an outlook on Lepton-Photon 2009.

CP VIOLATION IN B DECAYS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 266-273
Author(s):  
◽  
MAURIZIO BIASINI
Keyword(s):  
Cp Violation ◽  
B Meson ◽  
B Decays ◽  
Unitarity Triangle ◽  
Babar Experiment ◽  
Meson System ◽  
B Mixing

We present recent results on CP violation in the B meson system from the BABAR experiment at the PEP II asymmetric e+e- collider. We discuss the study of CP violation in B-mixing and present measurements of unitarity-triangle angles α, β, and constraints on γ.

SLAC's Asymmetric B Factory Will Study CP Violation

Physics Today ◽  
1999 ◽  
Vol 52 (1) ◽  
pp. 22-22 ◽  
Author(s):  
Bertram Schwarzchild
Keyword(s):  
Cp Violation ◽  
B Factory

scholarly journals Predictions for the Unitarity Triangle Angles in a New Parametrization

2003 ◽  
Vol 18 (26) ◽  
pp. 1825-1834 ◽  
Author(s):  
S. Chaturvedi ◽  
Virendra Gupta
Keyword(s):  
Cp Violation ◽  
Linear Combination ◽  
Excellent Agreement ◽  
Belle Collaboration ◽  
Isosceles Triangle ◽  
Unitarity Triangle ◽  
New Approach ◽  
Ckm Matrix ◽  
Unit Matrix ◽  
A Value

A new approach to the parametrization of the CKM matrix, V, is considered in which V is written as a linear combination of the unit matrix I and a nondiagonal matrix U which causes inter-generational-mixing, that is V = cos θ I + i sin θ U. Such a V depends on three real parameters including the parameter θ. It is interesting that a value of θ = π/4 is required to fit the available data on the CKM-matrix including CP-violation. Predictions of this fit for the angles α, β and γ for the unitarity triangle corresponding to [Formula: see text], are given. For θ = π/4, we obtain α = 88.46°, β = 45.046° and γ = 46.5°. These values are just about in agreement, within errors, with the present data. It is very interesting that the unitarity triangle is expected to be approximately a right-angle, isosceles triangle. Our prediction sin 2β = 1 is in excellent agreement with the value 0.99 ± 0.15 ± 0.05 reported by the Belle collaboration at the Lepton–Photon 2001 meeting.

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