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Author: Publisher: ISBN: Category : Languages : en Pages : 183
Book Description
This work is the result of the researchers carried out during a three years Ph. D. period in the BABAR experiment. The first chapter consists in an introduction to the theoretical aspects of the D° meson lifetime determination and CP violation parameters, as well as an overview of the CP violation in the B sector, which is the main topic of the experiment. The description of the experimental apparatus follows with particular attention to the Silicon Vertex Tracker detector, the most critical detector for the determination of decay vertices and thus of lifetimes and time dependent CP violation asymmetries. In the fourth chapter the operation and running of the vertex detector is described, as a result from the experience as Operation Manager of the SVT, with particular attention to the safety of the device and the data quality assurance. The last chapter is dedicated to the determination of the D° meson lifetime with the BABAR detector, which is the main data analysis carried out by the candidate. The analysis is characterized by the selection of an extremely pure sample of D° mesons for which the decay flight length and proper time is reconstructed. The description of the unbinned maximum likelihood fit follows, as well as the discussion of the possible sources of systematic uncertainties. In the appendix is also presented a preliminary study of a possible development regarding the determination of mixing and CP violation parameters for the D° meson.
Author: Publisher: ISBN: Category : Languages : en Pages : 183
Book Description
This work is the result of the researchers carried out during a three years Ph. D. period in the BABAR experiment. The first chapter consists in an introduction to the theoretical aspects of the D° meson lifetime determination and CP violation parameters, as well as an overview of the CP violation in the B sector, which is the main topic of the experiment. The description of the experimental apparatus follows with particular attention to the Silicon Vertex Tracker detector, the most critical detector for the determination of decay vertices and thus of lifetimes and time dependent CP violation asymmetries. In the fourth chapter the operation and running of the vertex detector is described, as a result from the experience as Operation Manager of the SVT, with particular attention to the safety of the device and the data quality assurance. The last chapter is dedicated to the determination of the D° meson lifetime with the BABAR detector, which is the main data analysis carried out by the candidate. The analysis is characterized by the selection of an extremely pure sample of D° mesons for which the decay flight length and proper time is reconstructed. The description of the unbinned maximum likelihood fit follows, as well as the discussion of the possible sources of systematic uncertainties. In the appendix is also presented a preliminary study of a possible development regarding the determination of mixing and CP violation parameters for the D° meson.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The B[sup 0] lifetime has been measured with a sample of 23 million B[bar B] pairs collected by the BABAR detector at the PEP-II e[sup+]e[sup -] storage ring during 1999 and 2000. Events from the semileptonic decay B[sup 0][yields] D*[sup -][ell][sup+][nu][sub[ell]] have been selected with a partial reconstruction method in which only the charged lepton and the slow[pi] from the D*[sup -][yields][bar D][sup 0][pi][sup -] decay are reconstructed. The result is[tau][sub B][sup 0]= 1.529[+-] 0.012 (stat)[+-] 0.029 (syst) ps.
Author: Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
The authors present a simultaneous measurement of the {bar B}° lifetime [tau](B°) and mixing parameter [Delta]m{sub d}. They use a sample of about 50000 {bar B}° --> D* 1 {anti {nu}}(l) partially reconstructed decays identified with the BABAR detector at the PEP-II storage ring at SLAC, where the flavor of the other B meson is determined from the charge of another high momentum lepton in the same event. The preliminary results are: tau(B°) = (1.50 ± 0.008(stat.) ± 0.030(syst.)) ps, [Delta]m{sub d} = (0.523 ± 0.004(stat.) ± 0.007(syst.)) p{sup s}( -1).
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
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?
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
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)]%.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The neutral B meson lifetime is measured with the data collected by the BABAR detector at the PEP-II storage ring during the years 1999 and 2000, with a total integrated luminosity of 20.7 fb[sup -1]. The decays B[sup 0][yields] D*[sup -][pi][sup+] and B[sup 0][yields] D*[sup -][rho][sup+] are selected with a partial-reconstruction technique, yielding samples of 6970[+-] 240 and 5520[+-] 250 signal events, respectively. With these events, the B[sup 0] lifetime is measured to be 1.533[+-] 0.034 (stat.)[+-] 0.038 (syst.) ps. This measurement serves as a test and validation of procedures required to measure the CP violation parameter sin (2[beta]+[gamma]) with partial reconstruction of these modes.
Author: Francesco Polci Publisher: ISBN: Category : Languages : en Pages : 190
Book Description
The CP violation is explained in the Standard Model with three quark generations with an irreducible phase in the Cabibbo-Kobayashi-Maskawa quark mixing matrix. The unitarity of this matrix can be represented in a complex plane as a triangle (called Unitarity Triangle). The measurement of the parameters of the triangle is a powerful test of the Standard Model description of the CP violation. This thesis tries to measure the weak phase 2beta+ gamma through the B0 -> D+ K0 Pi- decays. Respect to the two body decays B0 -> D(*)+ Pi- and B0 -> D+ Rho- presently used for the measurement of the same weak phase, the B0 -> D+ K0 Pi- decays should show up a larger CP asymmetry and does not rely on any theoretical assumption. After a review of all the methods for the measurement of 2beta+gamma, the thesis presents the results of a feasibility study of the measurement with the B0 -> D+ K0 Pi- decays . In a second part, the analysis performed on 316 fb-1 of data collected by the BaBar detector at the B-factory PEP2 is presented, from the selection of the events to the time-dependent Dalitz fit technique used in order to extract the weak phase 2beta+gamma as well as the amplitudes and phases of the intermediate resonances contributing to the decay. The result of the analysis gives the following estimation: 2beta+gamma = 89 +/- 53(stat) +23-14(syst) degrees with an irreducible ambiguity of 180 degrees.
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Author: ![Measurement of the B0 Lifetime with Partially Reconstructed B0 -] D*- L+ /u Decays PDF](https://books.google.com/books/content/images/frontcover/nlTEjwEACAAJ?fife=w80-h100)
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Author: David Mattill Strom![Measurement of the {bar B}° Lifetime and of the B°-{bar B}° Oscillation Frequency Using Partially Reconstructed {bar B}° --] D* L− {anti {nu}}{sub L} Decays PDF](https://books.google.com/books/content/images/frontcover/MPhbAQAACAAJ?fife=w80-h100)
Author: ![Measurement of D0-D0bar Mixing Using the Ratio of D0-]K-pi and K-K Lifetimes PDF](https://books.google.com/books/content/images/frontcover/N2jMwQEACAAJ?fife=w80-h100)
Author: ![Search for D0D0̄ Mixing with the Babar Detector Using the Hadronic Decay D0 [yields] K [pi] and Measurement of the Doubly Cabibbo Suppressed Decay Rate of D0[yields] K+ [pi] ̄ PDF](https://books.google.com/books/content/images/frontcover/fBQxXc5U24QC?fife=w80-h100)
Author: Massimiliano Turri
Author: ![Measurement of the B0 Meson Lifetime with Partial Reconstruction of B0-]D*-pi+ and B0-]D*-rho+ Decays PDF](https://books.google.com/books/content/images/frontcover/QtPajwEACAAJ?fife=w80-h100)
Author: 
Author: 
Author: Francesco Polci