Search for CP Violation in the Decays D0 to K- K+and D0 to Pi- Pi PDF Download
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Languages : en
Pages : 7
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We measure CP-violating asymmetries of neutral charmed mesons in the modes D° → K−K and D° →?−?+ with the highest precision to date by using D° → K−?+ decays to correct detector asymmetries. An analysis of 385.8 fb−1 of data collected with the BaBar detector yields values of a{sup KK}{sub CP} = (0.00 ± 0.34 (stat.) ± 0.13 (syst.))% and a{sup?{pi}}{sub CP} = ( -0.24 ± 0.52 (stat.) ± 0.22 (syst.))%, which agree with Standard Model predictions.
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Languages : en
Pages : 7
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Book Description
We measure CP-violating asymmetries of neutral charmed mesons in the modes D° → K−K and D° →?−?+ with the highest precision to date by using D° → K−?+ decays to correct detector asymmetries. An analysis of 385.8 fb−1 of data collected with the BaBar detector yields values of a{sup KK}{sub CP} = (0.00 ± 0.34 (stat.) ± 0.13 (syst.))% and a{sup?{pi}}{sub CP} = ( -0.24 ± 0.52 (stat.) ± 0.22 (syst.))%, which agree with Standard Model predictions.
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Languages : en
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I report on a measurement of \CP-violating asymmetries ($A_{\Gamma}$) between effective lifetimes of $D^0$ or $\bar{D}^0$ in fully reconstructed $D^0\to K^+ K^-$ and $D^0\to \pi^+\pi^-$ decays collected in $p\bar{p}$ collisions by the Collider Detector at Fermilab experiment. The full CDF data set corresponding to $9.7$ fb$^{-1}$ of integrated luminosity is used. The flavor of the charm meson at production is determined by exploiting the strong-interaction decay $D^{*+} \to D^0 \pi^+$, while the contamination from mesons originated in $b$-hadron decays is evaluated and subtracted from the sample. Signal yields as functions of the observed decay-time distributions are extracted from maximum likelihood fits and used to measure the asymmetries. The results, $A_\Gamma (K^+K^- ) = \bigl( -1.9 \pm 1.5 \mathrm{(stat)} \pm 0.4 \mathrm{(syst)} \bigr)\times10^{-3}$ and $A_\Gamma (\pi^+\pi^- )= \bigl( -0.1 \pm 1.8 \mathrm{(stat)} \pm 0.3 \mathrm{(syst)} \bigr)\times10^{-3}$, and their combination, $A_\Gamma = \bigl( -1.2 \pm 1.2\bigr)\times10^{-3}$, are consistent with the SM predictions and other experimental determinations.
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Languages : en
Pages : 7
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We search for CP violation in a sample of 4.7 x 104 Cabibbo suppressed D° → KK−?+?− decays. We use 470 fb−1 of data recorded by the BABAR detector at the PEP-II asymmetric-energy e+e− storage rings running at center-of-mass energies near 10.6 GeV. CP violation is searched for in the difference between the T-odd asymmetries, obtained using triple product correlations, measured for D° and {bar D}° decays. The measured CP violation parameter is A{sub T} = (1.0 ± 5.1{sub stat} ± 4.4{sub syst}) x 10−3.
![CP Violation in the D0 -] Pi+ Pi- Decay at CDF. PDF](https://books.google.com/books/content/images/frontcover/WPLGwQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 5
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We report a measurement of the CP violating asymmetry in D° →??− decays using approximately 215,000 decays reconstructed in about 5.94 fb−1 of CDF data. We use the strong D*+ → D°?+ decay ('D* tag') to identify the flavor of the charmed meson at production time and exploit CP-conserving strong c{bar c} pair-production in p{bar p} collisions. Higher statistic samples of Cabibbo-favored D° → K−?+ decays with and without D* tag are used to highly suppress systematic uncertainties due to detector effects. The result, A{sub CP}(D° →?+?−) = [0.22 ± 0.24 (stat.) ± 0.11 (syst.)]%, is the world's most precise measurement to date and it is fully consistent with no CP violation.
Author: Troels C. Petersen
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Languages : en
Pages : 210
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Following the idea of considering three-body decays with final state B to DKpi in the pursuit of the notoriously elusive unitary angle gamma, the initial steps towards its measurement are presented. Using a sample of approximately 88 million BBbar pairs collected with the BaBar detector at the PEP-II collider, a measurement of the branching fractions BO to D+- KO pi-+ and BO to D*+- KO pi-+ are presented for the entire Dalitz region: Br(BO to D+- KO pi-+) = (4.97 +- 0.69 +- 0.55) x 10^(-4) Br(BO to D*+- KO pi-+) = (3.00 +- 0.66 +- 0.29) x 10^(-4). In both decay modes the dominant resonance is the K*+-(892) between the neutral kaon and the charged pion. Measuring the branching fractions of the corresponding resonant two-body decays yields: Br(BO to D+- K*-+) = (4.78 +- 0.58 +- 0.53) x 10^(-4) Br(BO to D*+- K*-+) = (3.22 +- 0.59 +- 0.29) x 10^(-4). Performing a time-dependent CP asymmetries fit of the resonant decay mode BO to D+- K*-+ yields: C = 0.93 +- 0.18 +- 0.03 ABS[lambda] = 0.19 +- 0.25 +- 0.04 S = 0.18 +- 0.28 +- 0.02 Delta S = 0.08 +- 0.28 +- 0.02. As the amplitude ratio ABS[lambda] is consistant with zero, no interference sensitive to gamma can be established at this point.
Author: M. V. Purohit
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Languages : en
Pages : 4
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The authors present preliminary results of a search for direct CP violation in D{sup +} {yields} K{sup +}K{sup -} {pi}{sup +} decays using 87 fb{sup -1} of data acquired by the Babar experiment running on and near the {Upsilon}(4S) from 1999-2002. The authors report the asymmetries in the signal mode and in the main resonant subchannels. Based on the same dataset, they also report a new 90% CL upper limit of 0.0042 on the rate of D{sup 0}-{bar D}{sup 0} mixing using the decay modes D*{sup +} {yields} D{sup 0}{pi}{sup +}, D{sup 0} {yields} [K/K*]ev (+c.c.).
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Category :
Languages : en
Pages : 4
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Author: Cecilia Jarlskog
Publisher: World Scientific
ISBN: 9814632457
Category :
Languages : en
Pages : 733
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Contents:CP Phenomenology:Introduction to CP Violation (C Jarlskog)CP-Violation in the K0-K0-System (K Kleinknecht)The Quark Mixing Matrix, Charm Decays and B Decays (S Stone)The Question of CP Noninvariance — As Seen through the Eyes of Neutral Beauty (I I Bigi et al.)In Search of CP Noninvariance in Heavy Quark Systems (L-L Chau)CP Violation at High Energy e+e- Colliders (J Bernabéu & M B Gavela)CP Violation in the Standard Model with Four Families (A Datta & E A Paschos)CP Effects When Neutrinos are their Own Antiparticles (B Kayser)On Spontaneous CP Violation Triggered by Scalar Bosons (I I Bigi & A I Sanda)CP Violation and Left-Right Symmetry (R N Mohapatra)CP Violation and Supersymmetry (R N Mohapatra)Electric Dipole Moments (S M Barr & W H Marciano)Special Topics: The Strong CP Problem (R D Peccei)CP Violation and Cosmology (P Langacker)Nonleptonic Interactions:The 1/N Approach to Nonleptonic Weak Interactions (A J Buras)Chiral Perturbation Theory Approach to Weak Amplitudes (E de Rafael)What We Learnt from Weak Decays of Heavy Quarks (B Stech)Weak Hamiltonian on the Lattice (G Martinelli) Readership: High energy physicists. Keywords:CP Violation;Quark Mixing Matrix;Charm Decays;B Decays;Nonleptic Interactions;Heavy QuarksReview: “Similar material is most often available in journals, but the book accomplishes a valuable service in drawing it together … the one that will probably have the greatest utility and longest lifespan is the survey of B meson physics by I Bigi, V Khoze, N Uraltsev and A Sanda … Bigi et al. here provide the most thorough and readable account of the issues that I know of. I have seen no review comparable to the excellent summary of electric dipole moments by S Barr and W Marciano … the volume offers a generally readable entry into this field for a reader who has a basic background in particle physics.” John F Donoghue Science “… this book performs a very useful service for anyone active or interested in CP violation, both as a source of primary information and as a work of reference.” K J Peach J Phys. G: Nucl. Part. Phys.
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Languages : en
Pages : 125
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We search for CP violation in a sample of 4.7 x 104 singly Cabibbo suppressed D0 2!K+ K- [pi]+[pi]- decays and 1.8(2.6) x 104 D(s)+ 2!KS0 K+ [pi]+ [pi]- decays. CP violation is searched for in the difference between the T-odd asymmetries, obtained using triple product correlations, measured for D and D decays. The measured CP violation parameters are AT(D0) = (1.0 ± 5.1(stat) ± 4.4(syst)) x 10-3, AT(D+) = ( -11.96 ± 10.04(stat) ± 4.81(syst)) x 10-3 and AT(Ds+) = ( -13.57 ± 7.67(stat) ± 4.82(syst)) x 10-3. This search for CP violation showed that the T-odd correlations are a powerful tool to measure the CP violating observable AT. The relative simplicity of an analysis based on T-odd correlations and the high quality results that can be obtained, allow to consider this tool as fundamental to search for CP violation in four-body decays. Even if the CP violation has not been found, excluding any New Physics effect to the sensitivity of about 0.5%, it is still worth to search for CP violation in D decays. The high statistics that can be obtained at the LHC or by the proposed high luminosity B-factories, make this topic to be considered in high consideration by experiments such as LHCb, SuperB or SuperBelle. The results outlined in this thesis strongly suggest to include a similar analysis into the Physics program of these experiments.
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Languages : en
Pages : 8
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We report on a search for CP violation in the decay D{sup ±} 2!K{sub S}°[pi]{sup ±} using a data set corresponding to an integrated luminosity of 469 fb−1 collected with the BABAR detector at the PEP-II asymmetric energy ee− storage rings. The CP-violating decay rate asymmetry A{sub CP} is determined to be ( -0.44 ± 0.13(stat) {+-} 0.10(syst))%, consistent with zero at 2.7 [sigma] and with the standard model prediction of ( -0.332 {+-} 0.006)%. This is currently the most precise measurement of this parameter.
