Time Dependent Dalitz Plot Analysis Of The Charmless Decay B Superior 0 K Superior 0 Inferior S Pi Pi At Babar
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Time Dependent Dalitz Plot Analysis Of The Charmless Decay B0 K0 S Pi Pi At Babar
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Author :
language : en
Publisher:
Release Date : 2009
Time Dependent Dalitz Plot Analysis Of The Charmless Decay B0 K0 S Pi Pi At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
A time-dependent amplitude analysis of B° → K{sub S}°??− decays is performed in order to extract the CP violation parameters of f0(980)K{sub S}° and?°(770)K{sub S}° and direct CP asymmetries of K*+(892)?−. The results are obtained from the final BABAR data sample of (465 ± 5)106 B{bar B} decays, collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. The time dependent CP asymmetry for f0(980)K{sub S}° and?°(770)K{sub S}° are measured to be S(f0(980)K{sub S}°) = -0.97 ± 0.09 ± 0.01 ± 0.01, and S(?°(770)K{sub S}°) = 0.67 ± 0.20 ± 0.06 ± 0.04, respectively. In decays to K*+(892)?− the direct CP asymmetry is found to be A{sub CP}(K*{sup ±}(892)?{sup {-+}}) = -0.18 ± 0.10 ± 0.04 ± 0.00. The relative phases between B° → K*+(892)?− and {bar B}° → K*−(892)?+, relevant for the extraction of the unitarity triangle angle?, is measured to be??(K*(892)?) = (34.9 ± 23.1 ± 7.5 {+-} 4.7){sup o}, where uncertainties are statistical, systematic and model-dependent, respectively. Fit fractions, direct CP asymmetries and the relative phases of different other resonant modes have also been measured. A new method for extracting longitudinal shower development information from longitudinally unsegmented calorimeters is also presented. This method has been implemented as a part of the BABAR final particle identification algorithm. A significant improvement in low momenta muon identification at BABAR is obtained.
First Observation Of The Charmless Decay B To K Pi 0 Pi 0 And Study Of Its Dalitz Plot Structure
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Author :
language : en
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Release Date : 2012
First Observation Of The Charmless Decay B To K Pi 0 Pi 0 And Study Of Its Dalitz Plot Structure written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Results for the first measurement of the inclusive branching and CP asymmetry of the charmless 3-body decay B+ → K+[pi]0[pi]0 are presented. The analysis uses a data sample with an integrated luminosity of 429.0 fb-1, recorded by the BABAR detector at the PEP-II asymmetric B Factory. This sample corresponds to 470.9 ±} 2.8 million B$\bar{B}$ pairs. Measurements of the branching fractions (B) and CP asymmetries (ACP) of some of the intermediate resonances in the K+[pi]0[pi]0 Dalitz plot are also presented.
Dalitz Plot Analyses Of Charmless B Decays
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Author : Z. Yu
language : en
Publisher:
Release Date : 2005
Dalitz Plot Analyses Of Charmless B Decays written by Z. Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
We present preliminary results of maximum-likelihood Dalitz plot analyses performed by the BABAR Collaboration of the charmless hadronic decays B{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0}, B{sup +} {yields} K{sup +}{pi}{sup -}{pi}{sup +}, and B{sup +} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup +}. We report inclusive decay rates, as well as fractions and phases for intermediate resonant decays. We also report CP-violating charge asymmetries for intermediate resonant decays of neutral B mesons.
Selected Charm Physics Results From Babar
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Author :
language : en
Publisher:
Release Date : 2004
Selected Charm Physics Results From Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
A search is performed for mixing and CP violation in D[sup 0] decays from a 57 fb[sup -1] dataset acquired by the Babar experiment near the Upsilon(4S). The time-dependence is measured of wrong-sign decays D[sup 0] --> K[sup +] [pi][sup -] and also the lifetime ratios [tau](D[sup 0] --> K[sup -][pi][sup +])/[tau](D[sup 0] --> K[sup -]K[sup +]) and [tau](D[sup 0] --> K[sup -][pi][sup +])/[tau](D[sup 0] --> [pi][sup -][pi][sup +]). For the decays D[sup 0] --> K[sub s][sup 0]K[sup [+-]][pi][sup -] and D[sup 0] --> K[sub s][sup 0]K[sup +]K[sup -], preliminary measurements are presented of their branching fractions relative to that of D[sup 0] --> K[sub s][sup 0][pi][sup +][pi][sup -], together with an analysis of their Dalitz plot distributions.
Dalitz Plot Analysis Of The Decay B0 B0bar To K Pi Pi0
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Author :
language : en
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Release Date : 2008
Dalitz Plot Analysis Of The Decay B0 B0bar To K Pi Pi0 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
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.
Time Dependent Dalitz Plot Analysis Of B0 To D K0pi Decays
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Author :
language : en
Publisher:
Release Date : 2008
Time Dependent Dalitz Plot Analysis Of B0 To D K0pi Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
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.
Preliminary Study Of D0 K Pi Pi0 Decays With Dalitz Plots
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Author :
language : en
Publisher:
Release Date : 2003
Preliminary Study Of D0 K Pi Pi0 Decays With Dalitz Plots written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
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.
Time Dependent Cp Asymmetries And Branching Ratiomeasurements In Charmless Three Body B Decays At Babar
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language : en
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Release Date : 2007
Time Dependent Cp Asymmetries And Branching Ratiomeasurements In Charmless Three Body B Decays At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
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.
2 Beta Gamma From B 0 To D Mp K 0 Pi Pm Decays At Babar
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Author :
language : en
Publisher:
Release Date : 2007
2 Beta Gamma From B 0 To D Mp K 0 Pi Pm Decays At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
The authors present the results of a simulation study to perform the extraction of 2[beta] + [gamma] from B° → D{sup {-+}}K°[pi]{sup {+-}} decays through a time-dependent Dalitz analysis of BaBar data.
Investigation Of The Charmless Decay B U2192 K K U2213 K Using A Dalitz Plot Analysis At Babar
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Author :
language : en
Publisher:
Release Date : 2006
Investigation Of The Charmless Decay B U2192 K K U2213 K Using A Dalitz Plot Analysis At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Results of an amplitude analysis of the B±→ K± K∓ K± Dalitz plot are presented. The analysis is made using an integrated luminosity of 210.6 fb-1, recorded by the BABAR detector at the PEP-II asymmetric B Factory. This dataset corresponds to 231.8 million B$ar{B}$ pairs.