Direct Measurement of the Decays of Charmed D Mesons PDF Download
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Author: Guy Thomas Blaylock
Publisher:
ISBN:
Category :
Languages : en
Pages : 212
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Author: Guy Thomas Blaylock
Publisher:
ISBN:
Category :
Languages : en
Pages : 212
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Book Description
![Measurement of A[sub C] with Charmed Mesons at SLD. PDF](https://books.google.com/books/content/images/frontcover/VK3IDAEACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages :
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We present a direct measurement of the parity-violation parameter A[sub c]. The measurement is based on 550k Z[sup 0] decays collected by the SLD detector. The mean electron-beam polarization isP[sub e]= 73%. The tagging of c-quark events was performed using two methods: The exclusive reconstruction of D*[sup+], D[sup+], and D[sup 0] mesons, and the inclusive P[sub T] spectrum of soft-pions ([pi][sub s]) in the decay of D*[sup+][yields] D[sup 0][pi][sub s][sup+]. The results of these two methods are combined to give A[sub c]= 0.688[+-] 0.035(stat.)[+-] 0.025(sys.) (preliminary).
Author: Max-Planck-Institut für Physik und Astrophysik München
Publisher:
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Category :
Languages : de
Pages : 18
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Author:
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Category :
Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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Results on charmed meson production and decay are presented from the Mark III at SPEAR. F anti F* associated production is observed allowing a direct measurement of the F* mass. A search for the decay D .-->. .mu.nu/sub .mu./ in the recoil of hadronically tagged D/sup + -/ decays provides a stringent limit on the pseudoscalar decay constant f/sub D/. New results on D° anti D° mixing from semileptonic D° decays and evidence for a nonresonant component in D/sub e4/ decays are also presented.
Author:
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Category :
Languages : en
Pages : 20
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We present a study of the decay properties of charmed D mesons produced near the peak of the ?" (3770) resonance in e+e− annihilation. Branching fractions for nine Cabibbo-favored and three Cabibbo-suppressed decay modes are presented along with upper limits on one additional Cabibbo-favored and four additional Cabibbo-suppressed decay modes. A study of K?? decay mode Dalitz plots reveals a large quasi-two-body pseudoscalar-vector component for the D° decays and an apparent nonuniform population an the Dalitz plot for the D+ decay into K−?+?+. Using tagged events, we measure the charged particle multiplicity and strange particle content of D decays. A measurement of the D+ and D0 semileptonic decay fractions indicates that the D+ has a significantly longer lifetime than the D0.
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Category : Power resources
Languages : en
Pages : 354
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Author: Hamish Gordon
Publisher: Springer
ISBN: 3319070673
Category : Science
Languages : en
Pages : 167
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Our current understanding of the fundamental building blocks of the Universe, summarised by the Standard Model of particle physics, is incomplete. For example, it fails to explain why we do not see equal, or almost equal, numbers of particles and their antiparticle partners. To explain this asymmetry requires, among other effects, a mechanism known as charge-parity (CP) violation that causes differences between the rates at which particles and antiparticles decay. CP violation is seen in systems containing bottom and strange quarks, but not in those with up, charm or top quarks. This thesis describes searches for particle-antiparticle asymmetries in the decay rates of charmed mesons. No evidence of CP violation is found. With current sensitivities, an asymmetry large enough to observe probably could not be explained by the Standard Model. Instead an explanation could come from new physics, for example contributions from supersymmetric or other undiscovered heavy particles. In the thesis, the development of new techniques to search for these asymmetries is described. They are applied to data from the LHCb experiment at CERN to make precise measurements of asymmetries in the D^+->K^-K^+pi^+ decay channel. This is the most promising charged D decay for CP violation searches.
Author: Larry Donnie Gladney
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Author: Sheldon Stone
Publisher: World Scientific
ISBN: 9789810218362
Category : Science
Languages : en
Pages : 676
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Book Description
This 2nd edition is an extensive update of "B Decays?. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of ?Penguin? mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the ?Standard Model? and how further tests can be done using measurements of CP violation in the B system.
