Measurement Of D0 D0bar Mixing Using The Ratio Of D0 K Pi And K K Lifetimes

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Measurement Of D0 D0bar Mixing Using The Ratio Of D0 K Pi And K K Lifetimes

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Author :
language : en
Publisher:
Release Date : 2009

Measurement Of D0 D0bar Mixing Using The Ratio Of D0 K Pi And K K Lifetimes 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.

We measure the rate of D°-{bar D}° mixing with the observable y{sub CP} = (?{sub K?}/?{sub KK}) - 1, where?{sub KK} and?{sub K?} are respectively the mean lifetimes of CP-even D° → KK− and CP-mixed D° → K−?+ decays, using a data sample of 384 fb−1 collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B Factory. From a sample of D° and {bar D}° decays where the initial flavor of the decaying meson is not determined, we obtain y{sub CP} = [1.12 ± 0.26(stat) ± 0.22(syst)]%, which excludes the no-mixing hypothesis at 3.3?, including both statistical and systematic uncertainties. This result is in good agreement with a previous BABAR measurement of y{sub CP} obtained from a sample of D*+ → D°?+ events, where the D° decays to K−?+, K+K−, and {pi}+{pi}−, which is disjoint with the untagged D° events used here. Combining the two results taking into account statistical and systematic uncertainties, where the systematic uncertainties are assumed to be 100% correlated, we find y{sub CP} = [1.16 ± 0.22(stat) ± 0.18(syst)]%, which excludes the no-mixing hypothesis at 4.1?

Measurement Of D0 Overline D0 Mixing Using The Ratio Of Lifetimes For The Decays D0 To K Pi K K And Pi Pi

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Author :
language : en
Publisher:
Release Date : 2008

Measurement Of D0 Overline D0 Mixing Using The Ratio Of Lifetimes For The Decays D0 To K Pi K K And Pi Pi 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 present a measurement of D°-{bar D}° mixing parameters using the ratios of lifetimes extracted from a sample of D° mesons produced through the process D* → D°?+, that decay to K−?+, I−K+, or?−?+. the Cabibbo-suppressed modes K−K+ and?−?+ are compared to the Cabibbo-favored mode K−?+ to obtain a measurement of ycp, which in the limit of CP conservation corresponds to the mixing parameter y. The analysis is based on a data sample of 384 fb−1 collected by the BABAR detector at the PEP-II asymmetric-energy e+e− collider. They obtain ycp = [1.24 ± 0.39(stat) ± 0.13(syst)]%, which is evidence of D°-{bar D}° mixing at the 3? level, and?Y = [-0.26 ± 0.36(stat) ± 0.08(syst)]%, where?Y constrains possible CP violation. Combining this result with a previous BABAR measurement of ycp obtained from a separate sample of D° → K−K+ events, they obtain ycp = [1.03 ± 0.33(stat) ± 0.19(syst)]%.

Limits On D0 Anti D0 Mixing And Cp Violation From The Ratio Of Lifetimes For Decay To K Pi K K And Pi Pi

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Author :
language : en
Publisher:
Release Date : 2003

Limits On D0 Anti D0 Mixing And Cp Violation From The Ratio Of Lifetimes For Decay To K Pi K K And Pi Pi 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.

We present a measurement of D°-{bar D}° mixing parameters using the ratios of lifetimes extracted from samples of D° mesons decaying to K−?, K−K+, and?−?+. Using 91 fb−1 of data collected by the BABAR detector at the PEP-II asymmetric-energy B Factory, we obtain a value Y = (0.8 ± 0.4(stat.){sub -0.4}{sup +0.5}(syst.))%, which, in the limit of CP conservation, corresponds to the mixing parameter y =??/2?. Using the difference in lifetimes of D° and {bar D}° mesons, we obtain the CP-violation parameter?? = ( -0.8 ± 0.6(stat.) ± 0.2(syst.))%.

Measurement Of D0 D0bar Mixing And Cp Violation In Two Body D0 Decays

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Author :
language : en
Publisher:
Release Date : 2013

Measurement Of D0 D0bar Mixing And Cp Violation In Two Body D0 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 2013 with categories.

Determination Of The Wrong Sign Decay Rate D0 K Pi And The Sensitivity To D0 D0bar Mixing

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Author :
language : en
Publisher:
Release Date : 2002

Determination Of The Wrong Sign Decay Rate D0 K Pi And The Sensitivity To D0 D0bar Mixing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

The D[sup 0] meson can decay to the wrong sign K[sup+][pi][sup -] state either through a doubly Cabibbo suppressed decay or via mixing to the[bar D][sup 0] state followed by the Cabibbo favoured decay[bar D][sup 0][yields] K[sup+][pi][sup -]. We measure the rate of wrong sign decays relative to the Cabibbo favoured decay to (0.383[+-] 0.044[+-] 0.022)% and give our sensitivity to a mixing signal.

Measurement Of D 0 Bar D 0 Mixing From A Time Dependent Amplitude Analysis Of D 0 K Pi Pi0 Decays

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Author :
language : en
Publisher:
Release Date : 2008

Measurement Of D 0 Bar D 0 Mixing From A Time Dependent Amplitude Analysis Of D 0 K Pi Pi0 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.

Measurement Of D0 Bar D 0 Mixing With A Time Dependent Amplitude Analysis Of D0 2 K Pi Pi 0

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Author :
language : en
Publisher:
Release Date : 2013

Measurement Of D0 Bar D 0 Mixing With A Time Dependent Amplitude Analysis Of D0 2 K Pi Pi 0 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Flavor mixing of neutral mesons is a long and well known phenomenon in particle physics. Experimental evidence of mixing of the neutral kaon was obtained in 1956, followed in 1987 by the evidence of Bd mixing. In 1974, A. Pais and S.B. Treiman firstly introduced the idea of charm mixing and CP violation. Even though many searches were conducted over time, it was clear that the small scale at which both amplitude and frequency of the oscillation took place made any possible observation challenging. In 2007, both the BABAR and Belle experiments announced the first evidence of mixing in the charm sector. The analyses concerned the study of a two body decay of the D0 meson. Few months later, BABAR presented the analysis of the decay D0 2!K+[pi]-[pi]0 . This is the main topic of this thesis.

Search For A Lifetime Difference In D0 Decays

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Author :
language : en
Publisher:
Release Date : 2004

Search For A Lifetime Difference In D0 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 2004 with categories.

The D[sup 0] mixing parameter y = [Delta][Lambda]/2[Lambda] was determined by measuring the D[sup 0] lifetime separately for the K[sup -][pi][sup +] decay mode and the K[sup -]K[sup +] decay mode with 12.4 fb[sup -1] of data collected by the BABAR experiment in 2001. Backgrounds were suppressed with the D* [yields] D[sup 0][pi][sup +] decay and particle identification. The following preliminary result was obtained: y = ( -1.0 [+-] 2.2(stat) [+-] 1.7(syst))%.

D0 Anti D0 Mixing Results From Babar With D0 To K Pi Pi0

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Author :
language : en
Publisher:
Release Date : 2007

D0 Anti D0 Mixing Results From Babar With D0 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 2007 with categories.

We present a preliminary search for D°-{bar D}° mixing using the decays D° → K?−?°, additionally presenting Dalitz-plot distributions and a measurement of the branching ratio for this mode. A new tagging technique is used to produce the doubly Cabibbo-suppressed Dalitz plot, which in turn is used to motivate the method used for the D-mixing search. We analyze 230.4 fb−1 of data collected from the BABAR detector at the PEP-II collider. Assuming CP conservation, we find R{sub M}

Study Of D0 D 0 Mixing Parameters Using A Time Dependent Amplitude Analysis Of The Decay D0 K0s Pi Pi

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Author : Rolf Andreassen
language : en
Publisher:
Release Date : 2010

Study Of D0 D 0 Mixing Parameters Using A Time Dependent Amplitude Analysis Of The Decay D0 K0s Pi Pi written by Rolf Andreassen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.

I present a measurement of the mixing parameters in the D meson system, using 473.5 inverse fb of data from the BaBar detector. A time-dependent fit to the Dalitz plot of the decay D^0 -> K_S pi+ pi-, assuming no CP violation, finds for the DDbar mixing parameters, the normalised mass and width differences x and y, x = (0.43 ± 0.25 ± 0.20)% y = (0.70 ± 0.22 ± 0.17)% where the uncertainties are statistical and systematic. For D and Dbar samples separately, we find x(D) = (0.49 ± 0.36 ± 0.20)% y(D) = (0.82 ± 0.31 ± 0.17)% x(Dbar) = (0.46 ± 0.35 ± 0.20)% y(Dbar) = (0.55 ± 0.31 ± 0.17)%.