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Lattice QCD Calculations of Leptonic and Semileptonic Decays

Lattice QCD Calculations of Leptonic and Semileptonic Decays
Author:
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Total Pages:
Release: 1998
Genre:
ISBN:

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In lattice QCD, obtaining properties of heavy-light mesons has been easier said than done. Focusing on the B meson's decay constant, it is argued that towards the end of 1997 the last obstacles were removed, at least in the quenched approximation. These developments, which resulted from a fuller understanding and implementation of ideas in effective field theory, bode well for current studies of neutral meson mixing and of semileptonic decays.


Ungarsk kunst af i dag

Ungarsk kunst af i dag
Author: Inger Hanmann
Publisher:
Total Pages: 20
Release: 1972
Genre:
ISBN:

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Non-Standard Physics in Leptonic and Semileptonic Decays of Charmed Mesons

Non-Standard Physics in Leptonic and Semileptonic Decays of Charmed Mesons
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Total Pages: 9
Release: 2008
Genre:
ISBN:

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Recent measurements of the branching fraction for D{sub s} → lv disagree with the Standard Model expectation, which relies on calculations of f{sub D{sub s}} from lattice QCD. This paper uses recent preliminary measurements from CLEO and a new preliminary lattice-QCD result from this conference to update the significance of the discrepancy. The 'f{sub D{sub s}} puzzle' stands now at 3.5[sigma], with [sigma] predominantly from the statistical uncertainty of the experiments. New physics scenarios that could solve the puzzle would also lead to non-Standard amplitudes mediating the semileptonic decays D → Klv. This paper shows where the new amplitudes enter the differential rate and outlines where lattice QCD calculations are needed to confront recent and forthcoming measurements.


B Decays

B Decays
Author: Sheldon Stone
Publisher: World Scientific
Total Pages: 676
Release: 1994
Genre: Science
ISBN: 9789810218362

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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.


Particle Physics Reference Library

Particle Physics Reference Library
Author: Herwig Schopper
Publisher: Springer Nature
Total Pages: 632
Release: 2020
Genre: Heavy ions
ISBN: 3030382079

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This first open access volume of the handbook series contains articles on the standard model of particle physics, both from the theoretical and experimental perspective. It also covers related topics, such as heavy-ion physics, neutrino physics and searches for new physics beyond the standard model. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access