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Download or read book Legende obrazowa o Świetéj Jadwidge written by and published by . This book was released on 1880 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Vertexing and Lifetime Triggers and a Study of Bs Mixing Using Hadronic Decays at D Omega written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 155 pages
Book Rating : 4.:/5 (16 download)
Download or read book Development of Vertexing and Lifetime Triggers and a Study of Bs Mixing Using Hadronic Decays at written by and published by . This book was released on 2005 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The D0 detector underwent a major upgrade to maximize its ability to fully exploit Run II at the Fermilab Tevatron, the world's highest energy collider. The upgrade included a completely new central tracking system with an outer scintillating fiber tracker and an inner silicon vertex detector all within a 2T superconducting solenoid. This thesis describes the development of high level trigger algorithms including vertexing, impact parameter significance and invariant mass, that utilize tracks from these detectors. One of the main physics goals of Run II is the observation of Bs oscillations. This measurement, which cannot be performed at the B factories, will significantly constrain the ''unitarity triangle'' associated with Cp violation and so probe the Standard Model of particle physics. Furthermore this is an interesting measurement as the study of mixing in meson systems has a long history for revealing new physics. The second part of this thesis presents a study of the hadronic decay Bs → Ds?. This important mode provides the best proper time resolution for Bs mixing and is reconstructed for the first time at D0. Projections on the sensitivity to Bs oscillations are then presented.
Author : Christopher P. Barnes
Publisher :
ISBN 13 :
Total Pages : 155 pages
Book Rating : 4.:/5 (316 download)
Download or read book Development of Vertexing and Lifetime Triggers and a Study of B(s) Mixing Using Hadronic Decays at written by Christopher P. Barnes and published by . This book was released on 2005 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The D0 detector underwent a major upgrade to maximize its ability to fully exploit Run II at the Fermilab Tevatron, the world's highest energy collider. The upgrade included a completely new central tracking system with an outer scintillating fiber tracker and an inner silicon vertex detector all within a 2T superconducting solenoid. This thesis describes the development of high level trigger algorithms including vertexing, impact parameter significance and invariant mass, that utilize tracks from these detectors. One of the main physics goals of Run II is the observation of B{sub s} oscillations. This measurement, which cannot be performed at the B factories, will significantly constrain the ''unitarity triangle'' associated with Cp violation and so probe the Standard Model of particle physics. Furthermore this is an interesting measurement as the study of mixing in meson systems has a long history for revealing new physics. The second part of this thesis presents a study of the hadronic decay B{sub s} {yields} D{sub s}{pi}. This important mode provides the best proper time resolution for B{sub s} mixing and is reconstructed for the first time at D0. Projections on the sensitivity to B{sub s} oscillations are then presented.
Download or read book Development of Vertexing and Lifetime Triggers and a Study of B(s) Mixing Using Hadronic Decays at written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Not Provided.
Download or read book All Hadronic B Decay Trigger with the CDF Silicon Vertex Tracker written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon Vertex tracks are of fundamental importance for reconstructing B meson decays at a hadron collider. The upgraded CDF detector will deploy an online Silicon Vertex Tracker in the level 2 trigger. We have studied how this new device exploits the Tevatron large B meson production to select hadronic B decays fundamental for measuring CP violation and B{sub s} mixing.
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ISBN 13 :
Total Pages : 442 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-08 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download D[sup 0] Mixing, Lifetime Differences, and Hadronic Decays of Charmed Hadrons PDF Online Free](https://books.google.com/books/content/images/frontcover/tdrljwEACAAJ?fife=w200-h370)
Download or read book D[sup 0] Mixing, Lifetime Differences, and Hadronic Decays of Charmed Hadrons written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented are preliminary results from the BABAR Collaboration on charm physics, including limits on D[sup 0] mixing from the ratio of lifetimes from K[sup -][pi][sup+], K[sup+]K[sup -], and[pi][sup+][pi][sup -] final states (using 47.8 fb[sup -1] of data) and branching ratio, and Dalitz amplitude analyses of the decays D[sup 0][yields] K[sup 0]K[sup -][pi][sup+], [bar K][sup 0]K[sup+][pi][sup -], and[bar K][sup 0]K[sup+]K[sup -] (using 22 fb[sup -1] of data). The status of direct measurements of D[sup 0] mixing using wrong-sign D[sup 0][yields] K[sup+][pi][sup -] decays is also discussed.
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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (871 download)
Download or read book Bs Mixing at SLD. written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}° - {bar B}{sub s}° mixing using a sample of 400,000 hadronic Z° decays collected by the SLD experiment at the SLC during the 1996-98 run. Three analyses are presented in this paper. The first analysis partially reconstructs the B{sub s}° by combining a fully reconstructed D{sub s} with the remaining charged B decay tracks. The second analysis selects a sample of events with a partially reconstructed charm vertex and a lepton track. The third analysis reconstructs b-hadrons topologically and exploits the b 2!c cascade charge structure to determine the flavor of the b-hadron at decay. All three analyses take advantage of the large forward-backward asymmetry of the polarized Z° 2!b{bar b} decays and information in the hemisphere opposite to the reconstructed B vertex to determine the b-hadron flavor at production. The results of the three analyses are combined to exclude the following values of the B{sub s}° - {bar B}{sub s}° oscillation frequency: [Delta]m{sub s}
Download or read book Measurement of the $B^-$ Lifetime Using a Simulation Free Approach for Trigger Bias Correction written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The collection of a large number of B hadron decays to hadronic final states at the CDF II detector is possible due to the presence of a trigger that selects events based on track impact parameters. However, the nature of the selection requirements of the trigger introduces a large bias in the observed proper decay time distribution. A lifetime measurement must correct for this bias and the conventional approach has been to use a Monte Carlo simulation. The leading sources of systematic uncertainty in the conventional approach are due to differences between the data and the Monte Carlo simulation. In this paper they present an analytic method for bias correction without using simulation, thereby removing any uncertainty between data and simulation. This method is presented in the form of a measurement of the lifetime of the B− using the mode B− → D°[pi]−. The B− lifetime is measured as [tau]{sub B{sup -}} = 1.663 ± 0.023 ± 0.015 ps, where the first uncertainty is statistical and the second systematic. This new method results in a smaller systematic uncertainty in comparison to methods that use simulation to correct for the trigger bias.
Author :
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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (684 download)
Download or read book Measurement of the B and B° Lifetimes with Topological Vertexing at SLD. written by and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lifetimes of the B (B{sub u}) and B° (B{sub d}) mesons have been measured using a sample of 150,000 hadronic Z° decays collected by the SLD experiment at the SLC between 1993 and 1995. The analysis reconstructs the decay length and charge of the B meson using a novel topological technique. This method results in a high statistics sample of 6,033 (3,665) charged (neutral) vertices. The ratio of B:B° decays in the charged (neutral) sample is 1.8:1 (1:2.3).
Author : Sergio Grancagnolo
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (492 download)
Download or read book Hadronic Β Decays to Double Charm Final States written by Sergio Grancagnolo and published by . This book was released on 2005 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work is based on the analysis of the data collected at the BaBar experiment on the PEP-II collider at SLAC (Stanford Linear Accelerator Center, California) between 1999 and 2002. The data sample collected corresponds at 122.1 ± 0.6 ± 1.3 millions of BBbar pairs. The observation by BaBar of the DsJ*(2317)+ and DsJ(2460)+ mesons, discovered in 2003, raised a lot of interest for the spectroscopy of charmed hadrons. l reviewed theoretical explanations and recent experimental results. In the first part of the thesis , l studied the reconstruction efficiency of low energy pions produced in the D* meson decay. In the second part I studied the production of the new DsJ particles in the hadronic decays of the B meson with two charm quarks. To reach this goal l developed the technique to reconstruct the decays B-->DsJD(*). After clear evidence of signal on all the decay modes under study (some of them seen for the first time in the world !), l estimated the number of signal events and l computed the corresponding branching ratios, after background rejection, reconstruction efficiency evaluatlon and systematic errors estimation. The order of magnitude of the branching ratios is 10/\-3; these values are slightly smaller than the corresponding of the decays B-->DsD(*) , expected of the same order in the factorisatlon hypothesis. Using angular analysis l measured the quantum numbers of DsJ(2460)+, obtaining a result compatible with the hypothesis JP=1+
Download or read book Fully Reconstructed Hadronic B-decays at CDF. written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The CDF detector at the Tevatron Collider (Fermilab) has collected data from 1992 to 1995. During these years they performed several measurements by using B hadronic decays. All the analysis exploited lepton triggers. The new measurements the authors present here are on radiative B decays B → K{sup 0*}?, B → {var_phi}? and??. They show also preliminary study for the determination of the branching ratios B → J/?K?+?− and B →?{sub c} (1P) K+. In view of Run II they discuss CDF reaches using fully reconstructed B hadronic decays. This is done by scaling the number of events and the efficiencies found in Run I without rely on Monte Carlo simulation whenever it is possible.
Author : Jeffrey Robert Miles
Publisher :
ISBN 13 :
Total Pages : 241 pages
Book Rating : 4.:/5 (318 download)
Download or read book Observation of B0s - B−0s Oscillations Using Partially Reconstructed Hadronic Bs Decays written by Jeffrey Robert Miles and published by . This book was released on 2008 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The discovery threshold would not be achieved without inclusion of the partially reconstructed hadronic decays. We measure ... consistent with the Standard Model expectation.
Author : V. Fonseca
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (258 download)
Download or read book A Study of Hadronic Decays of the ... written by V. Fonseca and published by . This book was released on 1984 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download A Preliminary Study of the Structure of B[bar B]g Events Using Z[sup 0] Decays PDF Online Free](https://books.google.com/books/content/images/frontcover/pznkDAEACAAJ?fife=w200-h370)
Download or read book A Preliminary Study of the Structure of B[bar B]g Events Using Z[sup 0] Decays written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure of three-jet b[bar b]g events has been studied using hadronic Z[sup 0] decays recorded in the SLD experiment at SLAC. Three-jet final states were selected and the CCD-based vertex detector was used to identify two of the jets as a b or[bar b]. The distributions of the gluon energy and polar angle with respect to the electron beam were examined and were compared with perturbative QCD predictions. These distributions are potentially sensitive to an anomalous b chromomagnetic moment[kappa]. The authors measure[kappa] consistent with zero and set limits on its value.
Author :
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ISBN 13 :
Total Pages : 25 pages
Book Rating : 4.:/5 (871 download)
Download or read book Time Dependent B{sub S}°-{bar B}{sub S}° Mixing Using Inclusive and Semileptonic B Decays at SLD. written by and published by . This book was released on 1999 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}°-{bar B}{sub s}° mixing using a sample of 350,000 hadronic Z° decays collected by the SLD experiment at the SLC during the 1997-98 run. The analyses determine the b-hadron flavor at production by exploiting the large forward-backward asymmetry of polarized Z° 2!b{bar b} decays as well as information from the hemisphere opposite that of the reconstructed B decay. In one analysis, B decay vertices are reconstructed inclusively with a new topological technique, and separation between B{sub s}° and {bar B}{sub s}° decays exploits the B{sub s}° 2!D{sub s}− cascade charge structure. In the other analysis, semileptonic decays are selected and the B decay point is reconstructed by intersecting a lepton track with the trajectory of a topologically reconstructed D meson. The two analyses are combined with a third analysis described elsewhere to exclude the following values of the B{sub s}°-{bar B}{sub s}° mixing oscillation frequency: [Delta]m{sub s}
