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

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Total Pages : 17 pages
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Book Synopsis Measurement of Time-dependent CP Asymmetries in B^0 --] K^0_s K^0_s K^0_s Decays by : B. Aubert

Download or read book Measurement of Time-dependent CP Asymmetries in B^0 --] K^0_s K^0_s K^0_s Decays written by B. Aubert and published by . This book was released on 2006 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 Asymmetry in B0-]ccbar K(*)0 Decays

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ISBN 13 :
Total Pages : 15 pages
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Book Synopsis Measurement of Time-Dependent CP Asymmetry in B0-]ccbar K(*)0 Decays by :

Download or read book Measurement of Time-Dependent CP Asymmetry in B0-]ccbar K(*)0 Decays written by and published by . This book was released on 2009 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present updated measurements of time-dependent Cp asymmetries in fully reconstructed neutral B decays containing a charmonium meson. The measurements reported here use a data sample of (465 ± 5) x 106 [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric energy ee− storage rings operating at the SLAC National Accelerator Laboratory. The time-dependent CP asymmetry parameters measured from J/[psi] K{sub S}°, J/[psi]K{sub L}°, [psi](2S)K{sub S}°, [eta]{sub c}K{sub S}°, [chi]{sub c1}K{sub S}° and J/[psi] K*(892)° decays are: C{sub f} = 0.024 ± 0.020(stat) ± 0.016(syst) and -[eta]{sub f}S{sub f} = 0.687 ± 0.028(stat) ± 0.012(syst).

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

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ISBN 13 :
Total Pages : 8 pages
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Book Synopsis Measurement of Time-Dependent CP-Violating Asymmetries in B0 -]K*0 Gamma (K*0-]K0{sub S} Pi0) Decays by :

Download or read book Measurement of Time-Dependent CP-Violating Asymmetries in B0 -]K*0 Gamma (K*0-]K0{sub S} Pi0) Decays written by and published by . This book was released on 2004 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the time-dependent CP-violating asymmetries in B° → K*°[gamma](K*° → K{sub S}°[pi]°) decays based on 124 million [Upsilon](4S) → 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 CP Asymmetries in B0 to K0S K0S K0S Decays

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ISBN 13 :
Total Pages : 7 pages
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Book Synopsis Measurement of CP Asymmetries in B0 to K0S K0S K0S Decays by :

Download or read book Measurement of CP Asymmetries in B0 to K0S K0S K0S Decays written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present measurements of the time-dependent CP-violating asymmetries in B° → K{sub S}°K{sub S}°K{sub S}° decays based on 384 million [Upsilon](4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. They obtain the CP asymmetry parameters C = 0.02 ± 0.21 ± 0.05 and S = -0.71 ± 0.24 ± 0.04, where the first uncertainties are statistical and the second systematic. These results are consistent with standard model expectations.

Measurement of CP Asymmetry in B0 ---] F0 K0(S), B0 ---] Phi K0 And B0 ---] K+ K- K0(S) Decays

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ISBN 13 :
Total Pages : 4 pages
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Book Synopsis Measurement of CP Asymmetry in B0 ---] F0 K0(S), B0 ---] Phi K0 And B0 ---] K+ K- K0(S) Decays by : Paul E. Kutter

Download or read book Measurement of CP Asymmetry in B0 ---] F0 K0(S), B0 ---] Phi K0 And B0 ---] K+ K- K0(S) Decays written by Paul E. Kutter and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results on time-dependent CP asymmetries in f{sub 0}(980)({yields} {pi}{sup +}{pi}{sup -})K{sub S}{sup 0} and B{sup 0} {yields} K{sup +}K{sup -}K{sup 0}. The measurements use a data sample consisting of approximately 209(f{sub 0}(980)({yields} {pi}{sup +}{pi}{sup -})K{sub S}{sup 0}) and 227(B{sup 0} {yields} K{sup +}K{sup -}K{sup 0}) million B-meson pairs recorded at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC.

Measurement of CP Asymmetries in B0 to Phi K0 and B0 to K+K-Ks Decays

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Total Pages : pages
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Book Synopsis Measurement of CP Asymmetries in B0 to Phi K0 and B0 to K+K-Ks Decays by :

Download or read book Measurement of CP Asymmetries in B0 to Phi K0 and B0 to K+K-Ks Decays written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the time-dependent CP asymmetry parameters in B° 2!KK−K° based on a data sample of approximately 227 million B-meson pairs recorded at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. We reconstruct two-body B° decays to [phi](1020)K{sub s}° and [phi](1020)K{sub L}°, and the three-body decay KK−K{sub s}° with [phi](1020)K{sub s}° excluded. For the B° 2![phi]K° decays, they measure sin 2[beta]{sub eff}([phi]K°) = +0.50 ± 0.25(stat){sub -0.04}{sup +0.07}(syst). The B° 2!K+K−K{sub s}° decays are dominated by K+K− S-wave, as determined from an angular analysis; they measure sin 2[beta]{sub eff} (K+K−K{sub s}°) = +0.55 ± 0.22(stat) ± 0.04(syst) ± 0.11(CP), where the last error is due to the uncertainty in the fraction of CP-even contributions to the decay amplitude. We find no evidence for direct CP violation.

Time Dependent CP Asymmetries and Branching RatioMeasurements in Charmless Three Body B Decays at BABAR.

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ISBN 13 :
Total Pages : 355 pages
Book Rating : 4.:/5 (893 download)

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Book Synopsis Time Dependent CP Asymmetries and Branching RatioMeasurements in Charmless Three Body B Decays at BABAR. by :

Download or read book Time Dependent CP Asymmetries and Branching RatioMeasurements in Charmless Three Body B Decays at BABAR. written by and published by . This book was released on 2007 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work we presented measurements of CP violation and decay rates of B decays in final states not involving a charm quark in the final state. In particular, the time-dependent CP asymmetries of decays which proceed through b 2!s elementary transition is a particularly sensitive probe of physics beyond the Standard Model. In fact, even if the precise measurements of CP conserving and CP violating processes show the success of the CKM picture of the flavour physics, the sector of b 2!s transitions is still not strongly constrained and leaves room for new physics contributions. In particular, we considered the decays which have the cleanest theoretical prediction within the Standard Model: B° 2![phi]K° and B° 2!K{sub s}°K{sub s}°K{sub s}° [beta]{sub eff}{sup SM} = 0.379. We examined the former with a completely new approach with respect to the past: the study of CP violation in the whole KK−K° phase space through a time-dependent Dalitz plot analysis. With this approach, we simultaneously measured the CP-violating asymmetries of the [phi]KJ°, f0(980)K° resonant and KK−K° non-resonant contributions, avoiding one of the largest uncertainties which affected the previous measurements of B° 2![phi]K°. We find [beta]{sub eff}(B° 2![phi]K°) = 0.06 ± 0.16 ± 0.05, which is lower than the Standard Model expectation, but it is consistent with it within two standard deviations. Moreover, only a recently developed experimental technique, which allows the determination of the position of B decay vertex when no charged tracks are originating from it, has made possible the measurement of the time-dependent CP asymmetry in B° 2!K{sub s}°K{sub s}°K{sub s}° decays. The mixing-induced CP parameter S in the Standard Model should be equal to sin 2[beta] parameter, which is measured with high precision in B 2![c{bar c}]K° decays by the B-factories. This statement is true, in the Standard Model, with excellent approximation for the decays studied in this work. The summary of the measurements in the b 2!s sector is shown in Fig. 9.8 A naive average of the b 2!s penguins, which does not account for the correlations existing among [phi]K°, f0(980)K° and K+K−K°, and that includes also modes with larger theoretical uncertainties, shows that -[eta]{sub CP} x S is lower than sin 2[beta]. This is not an evidence of physics beyond the Standard Model, but the systematic deviation from the expected value is an hint that there is room for it. More compelling evidence for new physics could be obtained measuring significant deviation in each decay channel from Standard Model prediction. Currently all the measurement are statistically limited and therefore an increase in accumulated statistics will shed more light into this quest for New Physics.

Update of Time-Dependent CP Asymmetry Measurements in B to C-cbar-s Decays

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ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (893 download)

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Book Synopsis Update of Time-Dependent CP Asymmetry Measurements in B to C-cbar-s Decays by :

Download or read book Update of Time-Dependent CP Asymmetry Measurements in B to C-cbar-s Decays written by and published by . This book was released on 2008 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present updated measurements of time-dependent CP asymmetries in fully reconstructed neutral B decays containing a charmonium meson. The measurements reported here use a data sample of (465 ± 5) x 106 [Upsilon](4S) → B{bar B} decays collected with the BABAR detector at the PEP-II B factory. The time-dependent CP asymmetry parameters measured from J/[psi]K{sub S}°, J/[psi]K{sub L}°, [psi](2S)K{sub S}°, [chi]{sub c1}K{sub S}°, [eta]{sub c}K{sub S}°, and J/[psi]K*° decays are: (1) C{sub f} = 0.026 ± 0.020(stat) ± 0.016(syst); and (2) S{sub f} = 0.691 ± 0.029(stat) ± 0.014(syst).

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

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ISBN 13 :
Total Pages : 5 pages
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Book Synopsis A Study of Time-dependent CP-violating Asymmetries in B0-]J/psiK0S and B0-]psi(2S)K0S Decays by :

Download or read book A Study of Time-dependent CP-violating Asymmetries in B0-]J/psiK0S and B0-]psi(2S)K0S Decays written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Measurement of the Time-Dependent CP Asymmetry in the B0-]Phi K0 Decay

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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Measurement of the Time-Dependent CP Asymmetry in the B0-]Phi K0 Decay by :

Download or read book Measurement of the Time-Dependent CP Asymmetry in the B0-]Phi K0 Decay written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the time-dependent CP asymmetry for the neutral B-meson decay B° →? K°. They use a sample of approximately 114 million B-meson pairs taken at the?(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. They reconstruct the CP eigenstates?K{sub S}° and?K{sub L}° where? → KK−, K{sub S}° →?+?−, and K{sub L}° is observed via its hadronic interactions. The other B meson in the event is tagged as either a B° or {bar B}° from its decay products. The values of the CP-violation parameters are S{sub {phi}K} = 0.47 ± 0.34(stat){sub -0.06}{sup +0.08}(syst) and C{sub {phi}K} = 0.01 ± 0.33(stat) ± 0.10(syst).

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

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ISBN 13 :
Total Pages : 19 pages
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Book Synopsis Measurement of Time-dependent CP-Violating Asymmetries in B0 -] K+K-K0L Decays by : J. C. Chen

Download or read book Measurement of Time-dependent CP-Violating Asymmetries in B0 -] K+K-K0L Decays written by J. C. Chen and published by . This book was released on 2005 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

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ISBN 13 :
Total Pages : 15 pages
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Book Synopsis Measurement of Time-Dependent CP-Violating Asymmetries in B^0 Meson Decays to Eta' K^0_L. by : J. C. Chen

Download or read book Measurement of Time-Dependent CP-Violating Asymmetries in B^0 Meson Decays to Eta' K^0_L. written by J. C. Chen and published by . This book was released on 2005 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Measurement of Time Dependent CP Asymmetry Parameters in B0 Meson Decays to OmegaKs, EtaprimeKz, and Pi0Ks

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ISBN 13 :
Total Pages : 18 pages
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Book Synopsis Measurement of Time Dependent CP Asymmetry Parameters in B0 Meson Decays to OmegaKs, EtaprimeKz, and Pi0Ks by :

Download or read book Measurement of Time Dependent CP Asymmetry Parameters in B0 Meson Decays to OmegaKs, EtaprimeKz, and Pi0Ks written by and published by . This book was released on 2008 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Improved Measurement of CP Asymmetries in B0 to (ccbar)K0(*) Decays

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ISBN 13 :
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Book Synopsis Improved Measurement of CP Asymmetries in B0 to (ccbar)K0(*) Decays by :

Download or read book Improved Measurement of CP Asymmetries in B0 to (ccbar)K0(*) Decays written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 227 x 106 [Upsilon](4S) → B{bar B} decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The amplitude of the CP asymmetry, sin2[beta] in the Standard Model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B° or {bar B}° from its decay products. We measure sin2[beta] = 0.722 ± 0.040(stat) ± 0.023(syst) in agreement with the Standard Model expectation.

Measurement of CP Violation in B0 to [Phi]K0, and of Branching Fraction and CP Violation in B0 2!F0(980) K$0\atop{S}$

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ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (96 download)

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Book Synopsis Measurement of CP Violation in B0 to [Phi]K0, and of Branching Fraction and CP Violation in B0 2!F0(980) K$0\atop{S}$ by :

Download or read book Measurement of CP Violation in B0 to [Phi]K0, and of Branching Fraction and CP Violation in B0 2!F0(980) K$0\atop{S}$ written by and published by . This book was released on 2006 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors measure the time-dependent CP asymmetry parameters in B0 2!K+K-K0 based on a data sample of approximately 277 million B-meson pairs recorded at the Y(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. They reconstruct two-body B0 decays to [Phi](1020)K$0\atop{S}$ and [Phi](1020)K$0\atop{L}$. Using a time-dependent maximum-likelihood fit, they measure sin2[beta]eff([Phi]K0) = 0.48 ± 0.28 ± 0.10, and C([Phi]K0) = 0.16 ± 0.25 ± 0.09, where the first error is statistical, and the second is systematic. They also present measurements of the CP-violating asymmetries in the decay B0 2!f0(2![pi]+[pi]- )K$0\atop{S}$. The results are obtained from a data sample of 209 x 106 Y(4S) 2!B$\bar{B}$ decays, also collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-dependent maximum-likelihood fit they measure the mixing-induced CP violation parameter S(f0(980)K$0\atop{S}$) = - sin 2[beta]efff0(980)K$0\atop{S}$ = -0.95$+0.32\atop{-0.23}$ ± 0.10 and the direct CP violation parameter C(f0(980)K$0\atop{S}$) = - 0.24 ± 0.31 ± 0.15, where the first errors are statistical and the second systematic. Finally, they present a measurement of the branching fraction of the decay B0 2!f0(2![pi]+[pi]- )K$0\atop{S}$. From a time-dependent maximum likelihood fit to a data sample of 123 x 106 Y(4S) 2!B$\bar{B}$ decays they find 93.6 ± 13.6 ± 6.4 signal events corresponding to a branching fraction of [beta](B0 2!f0(980)(2![pi]+[pi]- )K0) = (6.0 ± 0.9 ± 0.6 ± 1.2) x 10-6, where the first error is statistical, the second systematic, and the third due to model uncertainties.

Amplitude Analysis and Measurement of the Time-dependent CP Asymmetry of B0 to KsKsKs Decays

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ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Amplitude Analysis and Measurement of the Time-dependent CP Asymmetry of B0 to KsKsKs Decays by :

Download or read book Amplitude Analysis and Measurement of the Time-dependent CP Asymmetry of B0 to KsKsKs Decays written by and published by . This book was released on 2012 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the first results on the Dalitz-plot structure and improved measurements of the time-dependent CP-violation parameters of the process B° → K{sub S}°K{sub S}°K{sub S}° obtained using 468 x 106 B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. The Dalitz-plot structure is probed by a time-integrated amplitude analysis that does not distinguish between B° and {bar B}° decays. We measure the total inclusive branching fraction?(B° → K{sub S}°K{sub S}°K{sub S}°) = (6.19 ± 0.48 ± 0.15 ± 0.12) x 10−6, where the first uncertainty is statistical, the second is systematic, and the third represents the Dalitz-plot signal model dependence. We also observe evidence for the intermediate resonant states f0(980), f0(1710), and f2(2010). Their respective product branching fractions are measured to be (2.70{sub -1.19}{sup +1.25} ± 0.36 ± 1.17) x 10−6, (0.50{sub -0.24}{sup +0.46} ± 0.04 ± 0.10) x 10−6, and (0.54{sub -0.20}{sup +0.21} ± 0.03 ± 0.52) x 10−6. Additionally, we determine the mixing-induced CP-violation parameters to be S = -0.94{sub -0.21}{sup +0.24} ± 0.06 and C = -0.17 ± 0.18 ± 0.04, where the first uncertainty is statistical and the second is systematic. These values are in agreement with the standard model expectation.

Measurement of CP Violation in B0 to ?K0, and of Branching Fraction and CP Violation in B0 {u2192} F0(980) K$0\atop{S}$.

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ISBN 13 :
Total Pages : 162 pages
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Book Synopsis Measurement of CP Violation in B0 to ?K0, and of Branching Fraction and CP Violation in B0 {u2192} F0(980) K$0\atop{S}$. by :

Download or read book Measurement of CP Violation in B0 to ?K0, and of Branching Fraction and CP Violation in B0 {u2192} F0(980) K$0\atop{S}$. written by and published by . This book was released on 2006 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors measure the time-dependent CP asymmetry parameters in B0 → K+K-K0 based on a data sample of approximately 277 million B-meson pairs recorded at the Y(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. They reconstruct two-body B0 decays to ?(1020)K$0top{S}$ and ?(1020)K$0top{L}$. Using a time-dependent maximum-likelihood fit, they measure sin2?eff(?K0) = 0.48 ± 0.28 ± 0.10, and C(?K0) = 0.16 ± 0.25 ± 0.09, where the first error is statistical, and the second is systematic. They also present measurements of the CP-violating asymmetries in the decay B0 → f0(→ ?+?-)K$0top{S}$. The results are obtained from a data sample of 209 x 106 Y(4S) → B$ar{B}$ decays, also collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-dependent maximum-likelihood fit they measure the mixing-induced CP violation parameter S(f0(980)K$0top{S}$) = - sin 2?efff0(980)K$0top{S}$ = -0.95$+0.32top{-0.23}$ ± 0.10 and the direct CP violation parameter C(f0(980)K$0top{S}$) = - 0.24 ± 0.31 ± 0.15, where the first errors are statistical and the second systematic. Finally, they present a measurement of the branching fraction of the decay B0 → f0(→ ?+?-)K$0top{S}$. From a time-dependent maximum likelihood fit to a data sample of 123 x 106 Y(4S) → B$ar{B}$ decays they find 93.6 ± 13.6 ± 6.4 signal events corresponding to a branching fraction of ?(B0 → f0(980)(→ ?+?-)K0) = (6.0 ± 0.9 ± 0.6 ± 1.2) x 10-6, where the first error is statistical, the second systematic, and the third due to model uncertainties.