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Languages : en
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A Dalitz plot analysis of the D[sup 0] hadronic decays D[sup 0][yields] K[sup 0]K[sup -][pi][sup+], D[sup 0][yields][bar K][sup 0] K[sup+][pi][sup -] and D[sup 0][yields][bar K][sup 0] K[sup+] K[sup -] is presented. This analysis is based on a data sample of 22 fb[sup -1] collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC running on or near the[Upsilon](4S) resonance. The events are selected from continuum e[sup+]e[sup -] annihilations using the decay D*[sup+][yields] D[sup 0][pi][sup+]. Preliminary measurements of the branching fractions of the above hadronic decays are obtained. Preliminary estimates of fractions and phases for resonant and nonresonant contributions to the Dalitz plot are also presented.

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Languages : en
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Particle physicists study the smallest particles and most basic rules of their interactions in humankind's current scope. The Charm Analysis Working Group (CWG) of the BaBar Collaboration studies decays involving the charm quark. They currently study mixing in D decays, an interesting and poorly understood phenomenon in current physics models. We, as part of the CWG, investigated the plausibility of using Dalitz plots and the BaBar analysis framework to study mixing in Wrong Sign (WS) D[sup 0][yields] K[pi][pi][sup 0] decays. Others in the CWG have studied mixing in the 2-body decay, D[sup 0][yields] K[pi]. The 3-body decay analyzed with the RooFitDalitz analysis package and Dalitz plots provides more information and another way of separating Doubly Cabibbo Suppressed Decays (DCSD) from mixing--which share the same end products. Through doing many simulations, we have demonstrated the usefulness of this approach. We selected D[sup 0][yields] K[pi][pi][sup 0] events from Simulation Production run No. 4 (SP4) and BaBar's run 1 and run 2. We made Dalitz plots with this data. Now that we better understand Dalitz plots and software, we plan to select WS D[sup 0][yields] K[pi][pi][sup 0] events and perform rate fits as discussed in BaBar Analysis Document (BAD) No. 443, as well as fits for several different decay times and resonances, in order to further distinguish DCSD from mixing.

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Languages : en
Pages : 16

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A Dalitz plot analysis of approximately 12,500 D° events reconstructed in the hadronic decay D° → {bar K}° K+K− is presented. This analysis is based on a data sample of 91.5 fb−1 collected with the BABAR detector at the PEP-II asymmetric-energy e+e− storage rings at SLAC running at center-of-mass energies on and 40 MeV below the ?(4S) resonance. The events are selected from e+e− → c{bar c} annihilations using the decay D*+ → D°?+. The following ratio of branching fractions has been obtained: BR = ?(D° → {bar K}°K+K−)/?(D° → {bar K}°?+?−) = (15.8 ± 0.1(stat.) ± 0.5 (syst.)) x 10−2. Estimates of fractions and phases for resonant and non-resonant contributions to the Dalitz plot are also presented. The a0(980) → {bar K}K projection has been extracted with little background. A search for Cp asymmetries on the Dalitz plot has been performed.

Author: Daniel Podolsky
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Languages : en
Pages : 35

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Languages : en
Pages : 30

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The authors report a Dalitz-plot analysis of the charmless hadronic decays of neutral B mesons to K{sup ±}?{sup {-+}}?°. With a sample of (231.8 ± 2.6) x 106?(4S) → B{bar B} decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, they measure the magnitudes and phases of the intermediate resonant and nonresonant amplitudes for B° and {bar B}° decays and determine the corresponding CP-averaged branching fractions and charge asymmetries. The inclusive branching fraction and CP-violating charge asymmetry are measured to be?(B° → K?−?°) = (35.7{sub -1.5}{sup +2.6} ± 2.2) x 10−6, and?{sub CP} = -0.030{sub -0.051}{sup +0.045} ± 0.055 where the first errors are statistical and the second systematic. They observe the decay B° → K*°(892)?° with the branching fraction?(B° → K*°(892)?°) = (3.6{sub -0.8}{sup +0.7} ± 0.4) x 10−6. This measurement differs from zero by 5.6 standard deviations (including the systematic uncertainties). The selected sample also contains B° → {bar D}°?° decays where {bar D}° → K+?−, and they measure?(B° → {bar D}°?°) = (2.93 ± 0.17 {+-} 0.18) x 10−4.

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Languages : en
Pages : 20

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We perform a Dalitz plot analysis of about 100,000 D{sub s}+ decays to K+K−?+ and measure the complex amplitudes of the intermediate resonances which contribute to this decay mode. We also measure the relative branching fractions of D{sub s}+ → K+K+?− and D{sub s}+ → K+K+K−. For this analysis we use a 384 fb−1 data sample, recorded by the BABAR detector at the PEP-II asymmetric-energy e+e− collider running at center-of-mass energies near 10.58 GeV.

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Category :
Languages : en
Pages : 15

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The authors report preliminary results from a study of the decay B° → {bar D}°??− using a data sample of 470.9 ± 2.8 million B{bar B} events collected with the BABAR detector at the?(4S) resonance. Using the Dalitz-plot analysis technique, they find contributions from the intermediate resonances D*2(2460)−, D*0(2400)−,?(770)° and f2(1270) as well as a?+?− S-wave term, a {bar D}°?− nonresonant S-wave term and a virtual D*(2010) amplitude. They measure the branching fractions of the contributing decays.

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Languages : en
Pages : 5

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A Dalitz plot analysis of D° events reconstructed in the hadronic decay D° 2!{bar K}°KK− is presented here. The analysis is based on a data sample of 91.5 fb−1. Herewith enclosed is an updated, preliminary analysis of D{sub sJ} states using 125 fb−1. All data have been collected with the BABAR detector at the PEP-II asymmetric-energy e+e- storage rings at SLAC running at center-of-mass energies on and 40 MeV below the [Upsilon](4S) resonance.

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Languages : en
Pages : 8

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We present for the first time a measurement of the weak phase 2[beta] + [gamma] obtained from a time-dependent Dalitz plot analysis of B° → D{sup {-+}}K°[pi]{sup ±} decays. Using a sample of approximately 347 x 106 B{bar B} pairs collected by the BABAR detector at the PEP-II asymmetric-energy storage rings, we obtain 2[beta] + [gamma] = (83 ± 53 ± 20)° and (263 ± 53 {+-} 20){sup o} assuming the ratio r of the b → u and b → c decay amplitudes to be 0.3. The magnitudes and phases for the resonances associated with the b → c transitions are also extracted from the fit.

Author:
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Languages : en
Pages : 17

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The author reports on a Dalitz plot analysis of B− → D+?−?− decays, based on a sample of about 383 million ?(4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. They find the total branching fraction of the three-body decay: ?(B− → D+ ?−?−) = (1.08 ± 0.01 ± 0.05) x 10−3. the masses and widths of D*2° and D*0°, the 2+ and 0+ c{bar u} P-wave states decaying to D+?−, are measured: m{sub D*2°} = (2460.4 ± 1.2 ± 1.2 ± 1.9) MeV/c2, ?{sub D*2°} = (41.8 ± 2.5 ± 2.1 ± 2.0) MeV, m{sub D*0°} = (2297 ± 8 ± 5 ± 19) MeV/c2 and ?{sub D*0°} = (273 ± 12 ± 17 ± 45) MeV. The stated errors reflect the statistical and systematic uncertainties, and the uncertainty related to the assumed composition of signal events and the theoretical model.