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Measurement Of D0 D0bar Mixing Using The Ratio Of D0 K Pi And K K Lifetimes
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Book Synopsis Measurement of D0-D0bar Mixing Using the Ratio of D0-]K-pi and K-K Lifetimes by :
Download or read book Measurement of D0-D0bar Mixing Using the Ratio of D0-]K-pi and K-K Lifetimes written by and published by . This book was released on 2009 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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?
Book Synopsis Measurement of D0̂-\overline{D0̂} Mixing Using the Ratio of Lifetimes for the Decays D0̂ \to K-̂\pi+̂, K-̂K+̂, and \pi-̂\pi+̂ by :
Download or read book Measurement of D0̂-\overline{D0̂} Mixing Using the Ratio of Lifetimes for the Decays D0̂ \to K-̂\pi+̂, K-̂K+̂, and \pi-̂\pi+̂ written by and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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)]%.
Book Synopsis Limits on D0 - Anti-D0 Mixing and CP Violation from the Ratio of Lifetimes for Decay to K- Pi+, K- K+, and Pi- Pi by :
Download or read book 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 published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.))%.
Book Synopsis Determination of the Wrong Sign Decay Rate D0 -] K+pi- and the Sensitivity to D0-D0bar Mixing by :
Download or read book Determination of the Wrong Sign Decay Rate D0 -] K+pi- and the Sensitivity to D0-D0bar Mixing written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Measurement of D0 - $\bar{D}$0 Mixing With a Time-Dependent Amplitude Analysis of D0 2!K+ [pi]- [pi]0 by :
Download or read book Measurement of D0 - $\bar{D}$0 Mixing With a Time-Dependent Amplitude Analysis of D0 2!K+ [pi]- [pi]0 written by and published by . This book was released on 2013 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis D0 Anti-D0 Mixing Results From BaBar with D0 to K+ Pi- Pi0 by :
Download or read book D0 Anti-D0 Mixing Results From BaBar with D0 to K+ Pi- Pi0 written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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}
Book Synopsis Measurement of D0-D0bar Mixing and CP Violation in Two-Body D0 Decays by :
Download or read book Measurement of D0-D0bar Mixing and CP Violation in Two-Body D0 Decays written by and published by . This book was released on 2013 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of D0-D̳0 Mixing Parameters Using a Time- Dependent Amplitude Analysis of the Decay D0 -] K0S̳[pi] [pi]− by : Rolf Andreassen
Download or read book Study of D0-D̳0 Mixing Parameters Using a Time- Dependent Amplitude Analysis of the Decay D0 -] K0S̳[pi] [pi]− written by Rolf Andreassen and published by . This book was released on 2010 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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)%.
Book Synopsis Measurement of D^0-\bar{D^0} Mixing From a Time-Dependent Amplitude Analysis of D^0\ -] K^+\pi^-\pi0 Decays by :
Download or read book Measurement of D^0-\bar{D^0} Mixing From a Time-Dependent Amplitude Analysis of D^0\ -] K^+\pi^-\pi0 Decays written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for a Lifetime Difference in D0 Decays by :
Download or read book Search for a Lifetime Difference in D0 Decays written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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))%.
Book Synopsis Measurement of D0 - $\bar{D}$0 Mixing With a Time-Dependent Amplitude Analysis of D0 {u2192} K+ ?- ?0 by :
Download or read book Measurement of D0 - $\bar{D}$0 Mixing With a Time-Dependent Amplitude Analysis of D0 {u2192} K+ ?- ?0 written by and published by . This book was released on 2013 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 → K+?-?0 . This is the main topic of this thesis.
Download or read book D0 - Anti-D0 Mixing at BaBar written by and published by . This book was released on 2007 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The BABAR and Belle collaborations have recently found evidence for mixing within the D meson system. We present some of the mixing search techniques used by BABAR and their status as of the beginning of the summer 2007. These have culminated in a measurement in the K[pi] decay final state of the D that is inconsistent with the no-mixing hypothesis with a significance of 3.9 standard deviations.
Download or read book D0 - D0bar Mixing written by and published by . This book was released on 2011 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, the B factory experiments BABAR and Belle as well as the CDF collaboration found evidence for mixing in the D meson system. The current status (beginning of summer 2008) of the experimental results of D° mixing is summarized. In this paper, we present an overview of D° mixing. After an introduction to the charm mixing phenomenology and analysis techniques, results of the mixing parameters and CP violation as related to mixing are summarized. They are obtained from hadronic two-body, multi-body final states and from quantum correlated D° decays of the experiments BABAR, Belle, Cleo and CDF. Mixing results from semileptonic D° decays can be found elsewhere.
Book Synopsis Measurement of CP Violation in B0d Mixing Using B0d 2!D*-[mu]+([nu][mu]X Decays by :
Download or read book Measurement of CP Violation in B0d Mixing Using B0d 2!D*-[mu]+([nu][mu]X Decays written by and published by . This book was released on 2012 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the measurement of the time-integrated semileptonic charge asymmetry in B0d mixing, ad sl, using the decay chain of B0d! D*-[mu]+([nu][mu]), D*-! D0[pi]-, D0! K+[pi]-. Decay candidates are reconstructed from 10.4 fb-1 of data recorded by the DØ detector at Fermilab's Tevatron p$\bar{p}$ collder during the 2002- 2011 'RunII' data taking period. Yields are extracted using a 2 minimising simultaneous binned fit where 490k D candidates are reconstructed. The measurements presented in this thesis was made possible due to sophisticated online and offline reconstruction software, precise tracking systems, and the first-order background asymmetry negating magnet polarity reversal of the DØ detector.
Book Synopsis String Theory and the Real World by : Gordon Kane
Download or read book String Theory and the Real World written by Gordon Kane and published by Morgan & Claypool Publishers. This book was released on 2017-03-27 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book attempts to explain why 'string theory' may provide the comprehensive underlying theory that describes and explains our world. It is an enthusiastic view of how compactified string/M-theories (plus data that may be reachable) seem to have the possibilities of leading to a comprehensive underlying theory of particle physics and cosmology, perhaps soon. We are living in a hugely exciting era for science, one during which it may be possible to achieve a real and true understanding of our physical world.
Book Synopsis The Physics of the B Factories by : Adrian Bevan
Download or read book The Physics of the B Factories written by Adrian Bevan and published by Springer. This book was released on 2015-03-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive work thoroughly introduces and reviews the set of results from Belle and BaBar - after more than two decades of independent and complementary work - all the way from the detectors and the analysis tools used, up to the physics results, and the interpretation of these results. The world’s two giant B Factory collaborations, Belle at KEK and BaBar at SLAC, have successfully completed their main mission to discover and quantify CP violation in the decays of B mesons. CP violation is a necessary requirement to distinguish unambiguously between matter and antimatter. The shared primary objective of the two B Factory experiments was to determine the shape of the so-called unitarity triangle, an abstract triangle representing interactions of quarks, the elementary constituents of matter. The area of the triangle is a measure of the amount of CP violation associated with the weak force. Many other measurements have been performed by the B Factories and are also discussed in this work.
Download or read book Neutrino Physics written by E. Bellotti and published by IOS Press. This book was released on 2003-12-08 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutrino physics contributed in an fundamental way to the progress of science, opening important windows of knowledge in elementary particle physics, as well in astrophysics and cosmology. Substantial experimental efforts are presently dedicated to improve our knowledge on neutrino properties as, in fact, we don't know yet some of the basic ones. Although very significant steps forward have been done, neutrino masses and mixings still remain largely unknown and constitute an important field for future research. Are neutrinos Majorana or Dirac particles? Have they a magnetic moment? Historically, studies on weak processes and, therefore, on neutrino physics, provided first the Fermi theory of weak interactions and then the V-A theory. Finally, the observation of weak neutral currents provided the first experimental evidence for unification of weak and electromagnetic interactions by the so called "Standard Model' of elementary particles. In addition to the results obtained from the measurement of the solar neutrino flux, the study of atmospheric neutrinos strongly supports the hypothesis of neutrino oscillation among different flavours. At the same time, the detection of neutrinos emitted by our Sun gave an important confirmation that the Sun produces energy via a chain of nuclear reactions; in particular in our Sun a specific cycle - the hydrogen cycle - is responsible for practically all the produced energy.
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