Charmed-Meson Decay Constants in Three-Flavor Lattice QCD

Aubin, Christopher; Bérnard, C.; DeTar, Carleton; Pierro, Massimo Di; Freeland, E. D.; Gottlieb, Steven; Heller, Urs M.; Hetrick, J. E.; El‐Khadra, Aida X.; Kronfeld, A. S.; Levkova, L.; Mackenzie, Paul B.; Menscher, D.; Maresca, F.; Nobes, M.; Okamoto, M.; Renner, Dru B.; Simone, J. N.; Sugar, R.; Toussaint, D.; Trottier, Howard D.

doi:10.1103/physrevlett.95.122002

Cited by 151 publications

(104 citation statements)

References 48 publications

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“…The value with the smallest quoted error is from the HPQCD Collaboration, f Ds = 241 ± 3 MeV [72]. 3 The MILC collaboration obtains f Ds = 249 ± 11 MeV [74] (with a provisional update of f Ds = 260 ± 10 MeV [75]). A partially quenched calculation by the ETMC Collaboration gives f Ds = 244 ± 8 MeV [76].…”

Section: Jhep10(2010)038mentioning

confidence: 99%

Measuring V ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons

Akeroyd

Mahmoudi

2010

J. High Energ. Phys.

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The experimental prospects for precise measurements of the leptonic decays B u → τ ν/µν, B s → µ + µ − , D → µν and D s → µν/τ ν are very promising. Double ratios involving four of these decays can be defined in which the dependence on the values of the decay constants is essentially eliminated, thus enabling complementary measurements of the CKM matrix element V ub with a small theoretical error. We quantify the experimental error in a possible future measurement of |V ub | using this approach, and show that it is competitive with the anticipated precision from the conventional approaches. Moreover, it is shown that such double ratios can be more effective than the individual leptonic decays as a probe of the parameter space of supersymmetric models. We emphasize that the double ratios have the advantage of using |V ub | as an input parameter (for which there is experimental information), while the individual decays have an uncertainty from the decay constants (e.g. f Bs ), and hence a reliance on theoretical techniques such as lattice QCD.

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Section: Jhep10(2010)038mentioning

confidence: 99%

Measuring V ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons

Akeroyd

Mahmoudi

2010

J. High Energ. Phys.

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“…If only one of these reduces the discrepancy to 1σ , one can derive the bounds [8,9,10]. Another candidate is the t-channel exchange of a charge + 2 3 leptoquark, which can arise in various ways, all of which are disfavored by non-observation of τ → µss.…”

Section: New Physicsmentioning

confidence: 99%

“…Now let us turn to lattice QCD calculations of f D s . There are two calculations with 2+1 flavors of sea quarks, the first from the Fermilab Lattice and MILC Collaborations [8] and more recently from the HPQCD Collaboration [9]. These are…”

Section: Leptonic Decaysmentioning

confidence: 99%

Non-Standard Physics in Leptonic Decays

Kronfeld¹

2009

Proceedings of the XXVI International Symposium on Lattice Field Theory — PoS(LATTICE 2008)

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Recent measurements of the branching fraction for D s → ν disagree with the Standard Model expectation, which relies on calculations of f D 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 D s puzzle" stands now at 3.5σ , with σ 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 → K ν. 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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“…This is important because these parameters also appear in staggered chiral forms for other physical quantities, e.g., heavy-light decay constants and form factors [5]. Fixing the parameters from the lightlight system reduces the systematic errors in heavy-light computations [6].…”

Section: Pos(lat2005)025mentioning

confidence: 99%

Update on pi and K Physics

Bérnard¹,

DeTar²,

Maresca³

et al. 2005

Proceedings of XXIIIrd International Symposium on Lattice Field Theory — PoS(LAT2005)

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We present an update of the MILC studies of the physics of light pseudoscalars using improved staggered fermions. New runs at lighter quark mass, as well as increased statistics for older sets, are enabling us to improve the results for decay constants in full QCD. In addition, we have analyzed quenched runs at two different lattice spacings. This makes possible a test of the applicability of staggered chiral perturbation theory in a different context.

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Charmed-Meson Decay Constants in Three-Flavor Lattice QCD

Cited by 151 publications

References 48 publications

Measuring V ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons

Measuring V ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons

Non-Standard Physics in Leptonic Decays

Update on pi and K Physics

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