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

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Recent measurements of the branching fraction for D{sub s} {yields} {ell}v 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 {yields} K{ell}v. This paper shows where the new amplitudes enter ... continued below

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9 pages

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Kronfeld, Andreas S. December 1, 2008.

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Recent measurements of the branching fraction for D{sub s} {yields} {ell}v 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 {yields} K{ell}v. 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.

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9 pages

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  • Journal Name: PoS LATTICE2008:282,2008; Conference: Talk given at 26th International Symposium on Lattice Field Theory (Lattice 2008), Williamsburg, Virginia, 14-20 Jul 2008

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  • Report No.: FERMILAB-CONF-08-554-T
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 946548
  • Archival Resource Key: ark:/67531/metadc899764

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  • December 1, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 26, 2017, 12:40 p.m.

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Kronfeld, Andreas S. Non-Standard Physics in Leptonic and Semileptonic Decays of Charmed Mesons, article, December 1, 2008; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc899764/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.