MEASUREMENT OF CP ASYMMETRY IN $B^0 \to f_0 K^0_S$, B0 → ϕK0 AND $B^0 \to K^+K^-K^0_S$ DECAYS

2005 ◽  
Vol 20 (15) ◽  
pp. 3531-3534
Author(s):  
◽  
PAUL E. KUTTER
Keyword(s):  
Maximum Likelihood ◽  
Cp Violation ◽  
B Meson ◽  
Time Dependent ◽  
Final States ◽  
Cp Asymmetry ◽  
Meson Factory ◽  
Babar Detector ◽  
Cp Asymmetries

We present results on time-dependent CP asymmetries in [Formula: see text] and B0 → K+K-K0. The measurements use a data sample consisting of approximately [Formula: see text] and 227(B0 → K+K-K0) million B-meson pairs recorded at the ϒ(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. From a time-dependent maximum likelihood fit, we measure for [Formula: see text]: the mixing-induced CP violation parameter [Formula: see text] and the direct CP violation parameter Cf0K = -0.24 ± 0.31 ( stat ) ± 0.15 ( syst ). From a simultaneous fit to [Formula: see text] and [Formula: see text] decays, we find: [Formula: see text] and CϕK = 0.00 ± 0.23 ( stat ) ± 0.05 ( syst ). For [Formula: see text] decays with [Formula: see text] decays excluded, we find: [Formula: see text] and [Formula: see text]. From the [Formula: see text] decays with [Formula: see text] decays excluded, we extract the fraction of CP-even final states from angular moments feven = 0.89 ± 0.08 ± 0.06.

scholarly journals FIRST MEASUREMENT OF THE CP-VIOLATING ASYMMETRIES WITH BABAR

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 611-615
Author(s):  
◽  
YURY G. KOLOMENSKY
Keyword(s):  
Maximum Likelihood ◽  
B Mesons ◽  
Time Distribution ◽  
B Meson ◽  
The Other ◽  
Time Dependent ◽  
Preliminary Measurement ◽  
Neutral B Meson ◽  
Asymmetry Amplitude ◽  
Babar Detector

We report on a preliminary measurement of time-dependent CP-violating asymmetries in [Formula: see text] and [Formula: see text] decays recorded by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The data sample consisted of 9.0 fb-1 collected at the ϒ(4S) resonance and 0.8 fb-1 off-resonance. One of the pair of neutral B mesons produced at the ϒ(4S) was fully reconstructed, while the flavor of the other neutral B meson was tegged at the time of its decay. The value of the asymmetry amplitude, sin 2β, was determined from a maximum likelihood fit to the time distribution of 120 tegged candidates to be sin 2β=0.12±0.37( stat. )± 0.09( syst. ) (preliminary).

scholarly journals Recent Measurements of CP-Violation at the B-Factories

2003 ◽  
Vol 18 (30) ◽  
pp. 2083-2098
Author(s):  
Gabriella Sciolla
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
New Physics ◽  
Experimental Results ◽  
Time Dependent ◽  
The Standard Model ◽  
Substantial Progress ◽  
Cp Asymmetries

Recent measurements of time-dependent CP-asymmetries at the B-factories have led to substantial progress in our understanding of CP-violation. In this paper, we review some of these experimental results and discuss their implications in the Standard Model and their sensitivity to New Physics.

NEW RESULTS ON CP VIOLATION IN B MESON DECAY

2007 ◽  
Vol 22 (02n03) ◽  
pp. 274-281
Author(s):  
◽  
TAKEO KAWASAKI
Keyword(s):  
Cp Violation ◽  
B Meson ◽  
Unitarity Triangle ◽  
Cp Asymmetry ◽  
B Meson Decays ◽  
B Meson Decay ◽  
The Status ◽  
Mixing Matrix ◽  
Belle Experiment ◽  
Violation Measurement

The Belle experiment has started in 1999 and has collected more than 600 fb-1 data at the ϒ(4S) resonance with the KEK-B asymmetric energy e+e- collider. In this contribution, the results of CP-violation measurement in B meson decays are presented. The large CP asymmetry arises thorough the interference between [Formula: see text] mixing and decay. The results yield constraints on the angles of the unitarity triangle, which is related to the Kobayashi-Maskawa quark mixing matrix. We discuss the status of the measurements on ϕ1, ϕ2 and ϕ3 with various methods.

CP VIOLATION IN B-MESON DECAYS

2005 ◽  
Vol 20 (02n03) ◽  
pp. 385-398
Author(s):  
KLAUS R. SCHUBERT
Keyword(s):  
Cp Violation ◽  
B Meson ◽  
Unitarity Triangle ◽  
Short Introduction ◽  
B Meson Decays ◽  
Ckm Matrix ◽  
Meson Decays ◽  
Babar Experiment ◽  
Cp Asymmetries

After a short introduction on CP asymmetries in K and B meson decays, I discuss a few recent results related to CP violation, mainly from the BABAR experiment: CPT tests in [Formula: see text] mixing, search for CP violation in [Formula: see text] and [Formula: see text] decays, and measurements of the unitarity-triangle angle α in B →ππ and B →ρρ decays. I conclude with the result of a CKM-matrix fit to all relevant observations.

Measurements of Time-Dependent CP Violation in Radiative B Meson Decays at BABAR

2010 ◽  
Author(s):  
A. Lazzaro ◽  
George Alverson ◽  
Pran Nath ◽  
Brent Nelson ◽  
Keyword(s):  
Cp Violation ◽  
B Meson ◽  
Time Dependent ◽  
B Meson Decays ◽  
Meson Decays

CP violation experiments at a B-meson factory

1992 ◽  
Vol 546 (1-2) ◽  
pp. 337-357 ◽  
Author(s):  
K.R. Schubert
Keyword(s):  
Cp Violation ◽  
B Meson ◽  
Meson Factory

scholarly journals Enhanced CP asymmetries in $$B \rightarrow K \mu ^+ \mu ^-$$

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Damir Bečirević ◽  
Svjetlana Fajfer ◽  
Nejc Košnik ◽  
Aleks Smolkovič
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Cp Asymmetry ◽  
Close Vicinity ◽  
The Standard Model ◽  
Before And After ◽  
Cp Asymmetries

AbstractWe show that the current values of $$R_K^\mathrm {exp}$$ R K exp and $$R_{K^*}^\mathrm {exp}$$ R K ∗ exp can be accommodated by allowing a nonzero New Physics coupling $$\delta C_9^{\mu \mu }$$ δ C 9 μ μ to be complex, both in the scenario in which only $$\delta C_9^{\mu \mu }$$ δ C 9 μ μ is affected, and in the scenario with complex $$\delta C_{9,10}^{\mu \mu }$$ δ C 9 , 10 μ μ satisfying $$\delta C_{9}^{\mu \mu }=-\delta C_{10}^{\mu \mu }$$ δ C 9 μ μ = - δ C 10 μ μ . A presence of the weak CP-violating phase can then be tested by measuring the CP-asymmetry, $$\mathcal {A}_\mathrm {CP}$$ A CP . We show that this asymmetry is enhanced around the peak of each $$c\bar{c}$$ c c ¯ -resonance, and in fact more pronounced in the close vicinity of $$J/\psi $$ J / ψ and $$\psi (2S)$$ ψ ( 2 S ) . Therefore, measuring $$\mathcal {A}_\mathrm {CP}$$ A CP before and after the resonances’ peak could be revelatory of the CP-violation that originates from beyond the Standard Model, or to be a significant constrain when building a realistic scenario of New Physics.

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