Download or read book The Measurement of CP Asymmetries in the Three body Charmless Decay B0 K0s K0s K0s written by Haleh Khani Hadavand and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 The Measurement of CP Asymmetries in the Three Body Charmless Decay Neutral B Meson Decays to Neutral Kaon S Neutral Kaon S Neutral Kaon S written by Haleh K. Hadavand and published by . This book was released on 2006 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, a measurement of CP-violating effects in decays of neutral B mesons is presented. The data sample for this measurement consists of about 272 million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2004 with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider, located at the Stanford Linear Accelerator Center. One neutral B meson is fully reconstructed in the CP eigenstate B{sup 0} {yields} K{sub S}{sup 0} K{sub S}{sup 0} K{sub S}{sup 0}. The other B meson is determined to be either a B{sup 0} or a {bar B}{sup 0}, at the time of its decay, from the properties of its decay products. The proper time {Delta}t elapsed between the decay of the two mesons is determined by reconstructing their decay vertices, and by measuring the distance between them. A novel technique for determining the B vertex of the decay to the CP eigenstate B{sup 0} {yields} K{sub S}{sup 0} K{sub S}{sup 0} K{sub S}{sup 0} has been applied since the tracks in the final state do not originate from the B decay vertex. The time-dependent CP asymmetry amplitudes are determined by the distributions of {Delta}t in events with a reconstructed B meson in the CP eigenstate. The detector resolution and the b flavor tagging parameters are constrained by the {Delta}t distributions of events with a fully reconstructed flavor eigenstate. Because of the special topology of this decay, the detector resolution on {Delta}t must be checked for consistency with decays with tracks which originate from the B decay. From a maximum likelihood fit to the {Delta}t distributions of all selected events, the value of the CP violating asymmetries are measured to be S{sub 3K{sub S}{sup 0}} = -0.71{sub -0.32}{sup +0.38} {+-} 0.04 and C{sub 3K{sub S}{sup 0}} = -0.34{sub -0.25}{sup +0.28} {+-} 0.05. Fixing C = 0 we measure the time-dependent CP asymmetry amplitude sin 2{beta} = -S{sub 3K{sub S}{sup 0}} = 0.79{sub -0.36}{sup +0.39} {+-} 0.04. The value of sin 2{beta} is in agreement with Standard Model predictions.
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 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).
Download or read book Measurement of the Branching Fraction and Time Dependent CP Asymmetry in B0 D D K0s Decays at the Belle Experiment written by Martin Ritter and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of CP Asymmetries and Branching Fractions in Charmless Two Body B Meson Decays to Pions and Kaons written by and published by . This book was released on 2012 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present improved measurements of CP-violation parameters in the decays B° →??−, B° → K+?−, and B° →?°?°, and of the branching fractions for B° →?°?° and B° → K°?°. The results are obtained with the full data set collected at the?(4S) resonance by the BABAR experiment at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory, corresponding to 467 ± 5 million B{bar B} pairs. We find the CP-violation parameter values and branching fractions S{sub?+?−} = -0.68 ± 0.10 ± 0.03, C{sub?+?−} = -0.25 ± 0.08 ± 0.02,?{sub K−?+} = -0.107 ± 0.016{sub -0.004}{sup +0.006}, C{sub?°?°} = -0.43 ± 0.26 ± 0.05,?(B° →?°?°) = (1.83 ± 0.21 ± 0.13) x 10−6,?(B° → K0?°) = (10.1 ± 0.6 ± 0.4) x 10−6, where in each case, the first uncertainties are statistical and the second are systematic. We observe CP violation with a significance of 6.7 standard deviations for B° →?+?− and 6.1 standard deviations for B° → K+{pi}{sup -}, including systematic uncertainties. Constraints on the Unitarity Triangle angle? are determined from the isospin relations among the B → {pi}{pi} rates and asymmetries. Considering only the solution preferred by the Standard Model, we find? to be in the range [71{sup o}, 109{sup o}] at the 68% confidence level.
Download or read book Time Dependent CP Asymmetries and Branching Ratio Measurements in Charmless Three Body B Decays at BABAR written by Emanuele Di Marco and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Branching Fraction and Time Dependent CP Asymmetry in B0 D D K0s Decays at the Belle Experiment written by Martin Ritter and published by . This book was released on 2014 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Brief discours sur aucunes actions des Estats G n raulx des Pays Bas s avoir sur le faict de la n gociation de paix apr s la surprise du chasteau ville de Namur l entretiennement de la pacification de Gand la puissante arm e written by and published by . This book was released on 1579 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Measurement of CP Violation in B0 J Psi K0S Decays with the LHCb Experiment written by and published by . This book was released on 2013 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Direct CP Asymmetries in Charmless Hadronic B Decays written by Emanuele Di Marco and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present recent results on time integrated and time dependent CP violation for charmless hadronic B decays using BABAR detector at the PEP-II B-factory.
Download or read book Measurement of CP Violation in B0 J K0S and B0 2S K0S Decays written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Measurement of Branching Fractions and Search for CP violating Charge Asymmetries in Charmless Two body B Decays Into Pions and Kaons 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 present measurements of the branching fractions and a search for CP-violating charge asymmetries in charmless hadronic decays of B mesons into two-body final states of kaons and pions. The results are based on a data sample of approximately 23 million BB(bar) pairs collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC.
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:
