Measurement of Time-Dependent CP-Violating Asymmetries in B0 -]K*0 Gamma (K*0-]K0[sub S] Pi0) Decays

Measurement of Time-Dependent CP-Violating Asymmetries in B0 -]K*0 Gamma (K*0-]K0[sub S] Pi0) Decays
Title Measurement of Time-Dependent CP-Violating Asymmetries in B0 -]K*0 Gamma (K*0-]K0[sub S] Pi0) Decays PDF eBook
Author
Publisher
Pages
Release 2004
Genre
ISBN

Download Measurement of Time-Dependent CP-Violating Asymmetries in B0 -]K*0 Gamma (K*0-]K0[sub S] Pi0) Decays Book in PDF, Epub and Kindle

We present a measurement of the time-dependent CP-violating asymmetries in B[sup 0] [yields] K*[sup 0][gamma](K*[sup 0] [yields] K[sub S][sup 0][pi][sup 0]) decays based on 124 million [Upsilon](4S) [yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. In a sample containing 105 [+-] 14 signal decays, we measure S[sub K*[sub [gamma]]] = 0.25 [+-] 0.63 [+-] 0.14 and C[sub K*[sub [gamma]]] = -0.57 [+-] 0.32 [+-] 0.09, where the first error is statistical and the second systematic.

Measurement of the Time-Dependent CP-Violating Asymmetry in $B^0 \to K^{0}_s\pi^0\gamma$ Decays

Measurement of the Time-Dependent CP-Violating Asymmetry in $B^0 \to K^{0}_s\pi^0\gamma$ Decays
Title Measurement of the Time-Dependent CP-Violating Asymmetry in $B^0 \to K^{0}_s\pi^0\gamma$ Decays PDF eBook
Author
Publisher
Pages 8
Release 2005
Genre
ISBN

Download Measurement of the Time-Dependent CP-Violating Asymmetry in $B^0 \to K^{0}_s\pi^0\gamma$ Decays Book in PDF, Epub and Kindle

We present a measurement of the time-dependent CP-violating asymmetry in B° 2!K*°[gamma] decays with K*° 2!K{sub S}°[pi]° based on 232 million [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy ee− collider at SLAC. In a sample containing 157 ± 16 signal decays, we measure S{sub K*°[gamma]} = -0.21 ± 0.40 ± 0.05 and C{sub K*°[gamma]} = -0.40 ± 0.23 ± 0.03, where the first error is statistical and the second systematic. We also explore B° 2!K{sub S}°[pi]°[gamma] decays with 1.1

Measurement of Time-dependent CP Asymmetries in B^0 --] K^0_s K^0_s K^0_s Decays

Measurement of Time-dependent CP Asymmetries in B^0 --] K^0_s K^0_s K^0_s Decays
Title Measurement of Time-dependent CP Asymmetries in B^0 --] K^0_s K^0_s K^0_s Decays PDF eBook
Author B. Aubert
Publisher
Pages 17
Release 2006
Genre
ISBN

Download Measurement of Time-dependent CP Asymmetries in B^0 --] K^0_s K^0_s K^0_s Decays Book in PDF, Epub and Kindle

The authors present an updated measurement of the time-dependent CP-violating asymmetry in B{sup 0} {yields} K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0} decays based on 347 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. The authors obtain the CP asymmetries S{sub f} = -0.66 {+-} 0.26 {+-} 0.08 and C{sub f} = -0.14 {+-} 0.22 {+-} 0.05, where the first uncertainties are statistical and the second systematic.

Measurement of Time-dependent CP-Violating Asymmetries in B0 -] K+K-K0L Decays

Measurement of Time-dependent CP-Violating Asymmetries in B0 -] K+K-K0L Decays
Title Measurement of Time-dependent CP-Violating Asymmetries in B0 -] K+K-K0L Decays PDF eBook
Author J. C. Chen
Publisher
Pages 19
Release 2005
Genre
ISBN

Download Measurement of Time-dependent CP-Violating Asymmetries in B0 -] K+K-K0L Decays Book in PDF, Epub and Kindle

The authors present preliminary measurements of the Cp asymmetry parameters and CP content in B{sup 0} {yields} K{sup +}K{sup -}K{sub L}{sup 0} decays, with B{sup 0} {yields} {phi}K{sub L}{sup 0} events excluded. In a sample of 227 M B{bar B} pairs collected by the BABAR detector at the PEP-II B Factory at SLAC, they find the CP parameters to be S = 0.07 {+-} 0.28(stat){sub -0.12}{sup +0.11}(syst); C = 0.54 {+-} 0.22(stat){sub -0.09}{sup +0.08}(syst) where the first error is statistical and the second is systematic. Estimating the fraction of CP-odd final states from angular moments analysis in the K{sup +}K{sup -}K{sub S}{sup 0} CP-conjugate final state, f{sub odd}(K{sup +}K{sup -}K{sub L}{sup 0}) = 0.92 {+-} 0.07(stat) {+-} 0.06(syst), they determine sin2{beta}{sub eff} = 0.09 {+-} 0.33(stat){sub -0.14}{sup +0.13}(syst) {+-} 0.10(syst CP-cont) where the last error is due to uncertainty on the CP content.

Measurement of Time-Dependent CP-Violating Asymmetries in B^0 Meson Decays to Eta' K^0_L.

Measurement of Time-Dependent CP-Violating Asymmetries in B^0 Meson Decays to Eta' K^0_L.
Title Measurement of Time-Dependent CP-Violating Asymmetries in B^0 Meson Decays to Eta' K^0_L. PDF eBook
Author J. C. Chen
Publisher
Pages 15
Release 2005
Genre
ISBN

Download Measurement of Time-Dependent CP-Violating Asymmetries in B^0 Meson Decays to Eta' K^0_L. Book in PDF, Epub and Kindle

The authors present a preliminary measurement of CP-violating parameters S and C from fits of the time-dependence of B{sup 0} meson decays to {eta}'K{sub L}{sup 0}. The data were recorded with the BABAR detector at PEP-II and correspond to 232 x 10{sup 6} B{bar B} pairs produced in e{sup +}e{sup -} annihilation through the {Upsilon}(4S) resonance. By fitting the time-dependent CP asymmetry of the reconstructed B{sup 0} {yields} {eta}'K{sub L}{sup 0} events, they find S = 0.60 {+-} 0.31 {+-} 0.04 and C = 0.10 {+-} 0.21 {+-} 0.03, where the first error quoted is statistical and the second is systematic. They also perform a combined fit using both {eta}'K{sub S}{sup 0} and {eta}'K{sub L}{sup 0} data, and find S = 0.36 {+-} 0.13 {+-} 0.03 and C = -0.16 {+-} 0.09 {+-} 0.02.

Time-Dependent CP Violation Measurements

Time-Dependent CP Violation Measurements
Title Time-Dependent CP Violation Measurements PDF eBook
Author Markus Röhrken
Publisher Springer Science & Business Media
Pages 205
Release 2013-10-17
Genre Science
ISBN 3319007262

Download Time-Dependent CP Violation Measurements Book in PDF, Epub and Kindle

This thesis describes a high-quality, high-precision method for the data analysis of an interesting elementary particle reaction. The data was collected at the Japanese B-meson factory KEKB with the Belle detector, one of the most successful large-scale experiments worldwide. CP violation is a subtle quantum effect that makes the world look different when simultaneously left and right and matter and antimatter are exchanged. This being a prerequisite for our own world to have developed from the big bang, there are only a few experimental indications of such effects, and their detection requires very intricate techniques. The discovery of CP violation in B meson decays garnered Kobayashi and Maskawa, who had predicted these findings as early as 1973, the 2008 Nobel prize in physics. This thesis describes in great detail what are by far the best measurements of branching ratios and CP violation parameters in two special reactions with two charm mesons in the final state. It presents an in-depth but accessible overview of the theory, phenomenology, experimental setup, data collection, Monte Carlo simulations, (blind) statistical data analysis, and systematic uncertainty studies.

A Study of Time-dependent CP-violating Asymmetries in B0-]J/psiK0S and B0-]psi(2S)K0S Decays

A Study of Time-dependent CP-violating Asymmetries in B0-]J/psiK0S and B0-]psi(2S)K0S Decays
Title A Study of Time-dependent CP-violating Asymmetries in B0-]J/psiK0S and B0-]psi(2S)K0S Decays PDF eBook
Author
Publisher
Pages 5
Release 2000
Genre
ISBN

Download A Study of Time-dependent CP-violating Asymmetries in B0-]J/psiK0S and B0-]psi(2S)K0S Decays Book in PDF, Epub and Kindle

We present a preliminary measurement of time-dependent CP-violating asymmetries in B° → J/[psi] K{sub S}° and B° → [psi](2S)K{sub S}° decays recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The data sample consists of 9.0 fb−1 collected at the [Upsilon](4S) resonance and 0.8 fb−1 off-resonance. One of the neutral B mesons, produced in pairs at the [Upsilon](4S), is fully reconstructed. The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The time difference between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities and the time resolution function are measured with samples of fully-reconstructed semileptonic and hadronic neutral B final states. The value of the asymmetry amplitude, sin2[beta], is determined from a maximum likelihood fit to the time distribution of 120 tagged B° → J/[psi] K{sub S}° and B° → [psi](2S) K{sub S}° candidates to be sin2[beta] = 0.12 ± 0.37(stat) ± 0.09(syst) (preliminary).