Tau decays with neutral kaons

Abbiendi, G.

doi:10.1007/s100520000317

Cited by 13 publications

(3 citation statements)

References 12 publications

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“…Measurements of g bb [172] rely on an inclusive lifetime-based tag applied to the jets reconstructed in the event, while measurements of g cc [131,173,174] make use of exclusive D * reconstruction, final states containing leptons, or are based on the combination of event shape variables.…”

Section: Fragmentation Of Heavy Quarksmentioning

confidence: 99%

Precision electroweak measurements on the Z resonance

2006

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We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron–positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarised beam at SLC. The measurements include cross-sections, forward–backward asymmetries and polarised asymmetries. The mass and width of the Z boson, mZmZ and ΓZΓZ, and its couplings to fermions, for example the ρρ parameter and the effective electroweak mixing angle for leptons, are precisely measured: mZ = 91.1875 ± 0.0021 GeV, Γ Z = 2.4952 ± 0.0023 GeV, ρℓ= 1.0050 ± 0.0010, sin2 θ (sup)lept (sub>eff = 0.23153 ± 0.00016. The number of light neutrino species is determined to be 2.9840 ± 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model (SM). At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward–backward asymmetry in b-quark production shows the largest difference with respect to its SM expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the Z-pole data are also used to predict the mass of the top quark, mt = 173+13 −10 GeV, and the mass of theW boson, mW = 80.363 ± 0.032 GeV. These indirect constraints are compared to the direct measurements, providing a stringent test of the SM. Using in addition the direct measurements of mt and and mWmW, the mass of the as yet unobserved SM Higgs boson is predicted with a relative uncertainty of about 50% and found to be less than 285GeV at 95% confidence level

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Section: Fragmentation Of Heavy Quarksmentioning

confidence: 99%

Precision electroweak measurements on the Z resonance

2006

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“…Two examples of results are displayed in figure 125. The figure on the left, from Opal [523], shows the results obtained from the study of the reaction e + e − → e + e − at 189 GeV. This is sensitive to the couplings |λ 1j 1 | with j = 2, 3.…”

Section: Limits From Associated Production At Lepmentioning

confidence: 99%

Supersymmetry facing experiment: much ado (already) about nothing (yet)

Pape

Treille

2006

Rep. Prog. Phys.

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This report emphasizes the comparison between supersymmetric models and experiments. A minimal theoretical introduction is included as a guide to the interpretation of results. The existing constraints from low energy measurements, accelerator searches (LEP, Tevatron and HERA) and non-accelerator searches for neutralinos are presented. Prospects for upgrades of these facilities and for the LHC and linear collider are summarized. Most discussions are made in the framework of the minimal supersymmetric standard model inspired by supergravity (MSUGRA). But alternatives such as gauge mediated supersymmetry breaking (GMSB), anomaly mediated supersymmetry breaking (AMSB), models with R-parity violation and even alternatives to supersymmetry are also briefly considered.

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“…Precision measurements of the branching fractions for various processes are essential for these studies. Despite extensive studies of τ hadronic decays performed at LEP and CLEO, prior to the B factory era, Cabibbo and phase-space suppression have resulted in limited statistics for the studies of kaon production in hadronic τ decays [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Measurements of branching fractions ofτlepton decays with one or moreKS0

Ryu

Adachi²,

Aihara

et al. 2014

Phys. Rev. D

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We report measurements of branching fractions of τ lepton decays to final states with a K 0 S meson using a 669 fb −1 data sample accumulated with the Belle detector at the KEKB asymmetric-energy e þ e − collider. The inclusive branching fraction is measured to bewhere the first uncertainty is statistical and the second is systematic. For each mode, the accuracy is improved over that of pre-B-factory measurements by a factor ranging from five to ten. In τ − → π − K 0 S K 0 S π 0 ν τ decays, clear signals for the intermediate states τ − → π − f 1 ð1285Þν τ and τ − → K Ã− K 0 S π 0 ν τ are observed.

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Tau decays with neutral kaons

Cited by 13 publications

References 12 publications

Precision electroweak measurements on the Z resonance

Precision electroweak measurements on the Z resonance

Supersymmetry facing experiment: much ado (already) about nothing (yet)

Measurements of branching fractions ofτlepton decays with one or moreKS0

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