Download or read book CP Asymmetries at BABAR written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present recent measurements of CP asymmetries in the B meson system, based on 92 fb−1 collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC.

Download or read book The Measurement of Time Dependent CP Violating Asymmetries in Loop Dominated B Decays with BABAR written by A. Hoecker and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on preliminary measurements of time-dependent CP asymmetries in neutral B decays to CP eigenstates with transition amplitudes that are dominated by penguin-type loops. The results are obtained from a data sample of up to 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B-meson Factory at SLAC. The amplitudes of the effective mixing-induced CP asymmetries, sin2{beta}{sub eff}, are derived from decay-time distributions of events in which one neutral B meson is fully reconstructed in a final state without charm and the other B meson is determined to be either a B{sup 0} or {bar B}{sup 0} from its decay products.

Download or read book First Measurement of the CP Violating Asymmetries with BaBar written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on 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 B Factory at SLAC. The data sample consisted of 9.0 fb−1 collected at the [Upsilon](4S) resonance and 0.8 fb−1 off-resonance. One of the pair of neutral B mesons produced at the [Upsilon](4S) was fully reconstructed, while the flavor of the other neutral B meson was tagged at the time of its decay. The value of the asymmetry amplitude, sin2[beta], was determined from a maximum likelihood fit to the time distribution of 120 tagged candidates to be sin2[beta] = 0.12 ± 0.37(stat.) ± 0.09(syst.) (preliminary).

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.

Download or read book Measurement of CP Violating Asymmetry Sin2beta with the BABAR Detector written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of electroweak interactions describes CP violation in weak interactions as a consequence of a complex phase in the three-generation Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix. In this framework, measurements of CP-violating asymmetries in the time distribution of neutral B decays to charmonium final states provide a direct measurement of sin2[beta][2], where[beta][triple-bond] arg[-V[sub cd]V*[sub cb]/V[sub td]V*[sub tb]]. The authors report an updated measurement of time-dependent CP-asymmetries in samples of fully reconstructed B decays to charmonium-containing CP eigenstates (b[yields] c[bar c]s). The data for these studies were recorded at the[Upsilon](4S) resonance with the BABAR detector at the PEP-II asymmetric-energy e[sup+]e[sup -] collider at the Stanford Linear Accelerator Center.

Download or read book BaBar Status and Prospects for CP Asymmetry Measurements written by and published by . This book was released on 2007 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent experimental results on CP violation related to the angles of the Cabibbo-Kobayashi-Maskawa (CKM) unitarity triangle 2[beta] + [gamma] are summarized in these proceedings. These results are obtained with approximately 232 million [Upsilon](4S) → B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy B-factory at SLAC. Using the measurements on time-dependent CP asymmetries in B° → D{sup (*){-+}} [pi]{sup {-+}} and B° → D{sup {-+}}[rho]{sup {+-}} decays and theoretical assumptions, one finds.

Download or read book The Measurement of Time Dependent CP Violating Asymmetries in Loop Dominated B Decays with BABAR written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Measurement of CP Asymmetries and Branching Fractions in Neutral B Meson Decays to Charged Rhos and Pions kaons with the BABAR Detector written by Ran Liu and published by . This book was released on 2004 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Measurements of CP Violation in B0 to Ccbar K 0 Decays from Babar 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 new measurements of CP asymmetries in B° → (c{bar c})K{sup 0(*)} decays recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC between 1999 and 2004. We determine sin2[beta] from decay-time distributions of 7730 signal events in a data sample of approximately 227 x 106 [Upsilon](4S) → B{bar B} decays. The measured value of sin2[beta] = 0.722 ± 0.040(stat) ± 0.023(syst) is in agreement with the value expected from the Standard Model. In a separate time-dependent angular analysis of B → J/[psi] K*° (K*° → K{sub S}°[pi]°) decays we measure cos 2[beta] to be positive at 86% CL.

Download or read book Measurement of CP Asymmtetries at BABAR written by G. Mancinelli and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present preliminary measurements of CP-violating asymmetries in B decays. These include new results on the CKM angle {alpha} based on studies of the decay B {yields} {rho}{sup +}{rho}{sup -} and several charmonium and hadronic penguin modes, sensitive to the CKM angle {beta}, including results on B {yields} {phi}K{sub S}{sup 0}, B {yields} K{sup +}K{sup -}K{sup 0}, B {yields} {eta}{prime} K{sub S}{sup 0}, B {yields} f{sub 0}K{sub S}{sup 0}, and B {yields} {pi}{sup 0} K{sub S}{sup 0}. We also report on several of results related to the extraction of {gamma} and (2{beta} + {gamma}) and present limits on CPT violation in B decays.

Download or read book Measurements of Time Dependent CP Asymmetries in B to S Penguin Dominated Hadronic B Decays at BaBar written by and published by . This book was released on 2009 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report measurements of Time-Dependent CP asymmetries in several b --> s penguin dominated hadronic B decays, where New Physics contributions may appear. We find no significant discrepancies with respect to the Standard Model expectations.

Download or read book Measurements of CP violating Asymmetries and Branching Fractions in the Decays of B Mesons to Charged Pions and Kaons at the Babar Detector written by Morris Nicholas Danielson and published by . This book was released on 2005 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of CP Asymmetries for the Decays B sup D sub CP sup 0 K sup with the BABAR Detector written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present preliminary observations of the decays of charged B mesons to a K* and a D[sup 0] where the latter particle is seen in final states of even and odd CP. They express the results in terms of R[sub CP] and A[sub CP]. With more statistics, these quantities will constrain [tau][sub B], the ratio of amplitudes defined in equations provided and the angle [gamma] of the unitary triangle by application of the Gronau-London-Wyler method.

Download or read book Measurement of Branching Fraction Ratios and CP Asymmetries in B And 8594D0 CPK Decays with the BABAR Detector written by and published by . This book was released on 2005 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary goals of the BABAR experiment are the detection of CP violation (CPV) in the B meson system, the precise measurement of some of the elements of the CKM matrix and the measurement of the rates of rare B meson decays. At present, BABAR has achieved major successes: (1) the discovery, in neutral B decays, of direct and mixing-induced CP violation; (2) accurate measurements of the magnitudes of the CKM matrix elements.

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.

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.

Download or read book Measurement of CP Asymmetries for the Decays B sup D sub CP K sup with the BABAR Detector written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present preliminary observations of the decays of charged B mesons to a K* and a D° where the latter particle is seen in final states of even and odd CP. They express the results in terms of R{sub CP} and A{sub CP}. With more statistics, these quantities will constrain [tau]{sub B}, the ratio of amplitudes defined in equations provided and the angle [gamma] of the unitary triangle by application of the Gronau-London-Wyler method.