Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>→<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ν branching ratio

Britton, D.; Ahmad, S.; Bryman, D. A.; Burnham, R. A.; Clifford, E. T. H.; Kitching, P.; Kuno, Y.; Macdonald, J. A.; Numao, T.; Olin, A.; Poutissou, J. M.; Dixit, M. S.

doi:10.1103/physrevlett.68.3000

Cited by 229 publications

(205 citation statements)

References 17 publications

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“…This assumption is also consistent with the constraint set by universality between β and µ decay [25,45]. The parameter Im(f τ l f * lτ ) M 2 h is constrained only by the measurement of τ leptonic decays.…”

Section: Multi-higgs Doublet Models (Mhd)supporting

confidence: 50%

Search for nonstandard modelCPorTviolation at theτ-charm factory

Huang

Lu²,

Tao³

1997

Phys. Rev. D

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We systematically investigate the possibility of finding CP/T violation in the τ sector at Tau-Charm Factory. CP/T violation may occur at τ pair production process, expressed as electric dipole moment, and at tau decay processes. By assuming that electric dipole moment as large as 10 −19 e-cm and CP/T violation effect orignating from τ decay as large as 10 −3 are observable at Tau-Charm Factory, we studied all the possible extensions of the SM which are relevent for generating CP/T violation in τ sector. And we pointed there are a few kind of models, which are hopeful for generating such CP/T violation. For these models we consider all the theoretical and current experimental constraints and find that there exists some parameter space which will result in a measurable CP/T violation. Therefore we conclude that Tau-Charm Factory is a hopeful place to discover CP/T violation in τ sector.

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Section: Multi-higgs Doublet Models (Mhd)supporting

confidence: 50%

Search for nonstandard modelCPorTviolation at theτ-charm factory

Huang

Lu²,

Tao³

1997

Phys. Rev. D

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“…The two experiments obtain consistent results and have similar precision: R = 1 : 2265 0:0034 0:0044 10 4 [3] R = 1 : 235 0:003 0:004 10 4 [4] where the rst errors are statistical and the second systematic. They are mainly independent and the two results can be averaged and compared with the theoretical prediction using eqn.1 giving: g e g = 0 : 9987 0:0019 in agreement with the hypothesis of e-universality.…”

Section: E-universalitysupporting

confidence: 50%

“…The most recent prediction for R T H [2] is R T H = (1:2345 0:0010) 10 4 where the uncertainty arises from uncalculated but bounded pion structure e ects. Two experiments, one performed at TRIUMF [3] and the other at PSI [4], have recently published new precise measurements of R. P ositive pions are stopped in an active target and the prompt electrons from the ! e rear decay are separated from the much larger background !…”

Section: E-universalitymentioning

confidence: 99%

Precision tests of the electroweak interaction

Rolandi¹

1992

AIP Conference Proceedings

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“…4(a) and exclude |U e4 | 2 < O(10 −3 ) when 1 keV m 4 450 keV. 4 • An experiment performed at TRIUMF used the kinematics of Γ(π → eν) to place limits on |U e4 | 2 < O(10 −8 ) at 90% CL for 10 MeV m 4 55 MeV [60,61].…”

Section: Direct Experimental Constraintsmentioning

confidence: 99%

Global constraints on a heavy neutrino

2016

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We estimate constraints on the existence of a heavy, mostly sterile neutrino with mass between 10 eV and 1 TeV. We improve upon previous analyses by performing a global combination and expanding the experimental inputs to simultaneously include tests for lepton universality, lepton flavor violating processes, electroweak precision data, dipole moments, and neutrinoless double beta decay. Assuming the heavy neutrino and its decay products are invisible to detection, we further include, in a self-consistent manner, constraints from direct kinematic searches, the kinematics of muon decay, cosmology, and neutrino oscillations, in order to estimate constraints on the values of |Ue4| 2 , |Uµ4| 2 , and |Uτ4| 2 .

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Measurement of theπ+→e+ν branching ratio

Cited by 229 publications

References 17 publications

Search for nonstandard modelCPorTviolation at theτ-charm factory

Search for nonstandard modelCPorTviolation at theτ-charm factory

Precision tests of the electroweak interaction

Global constraints on a heavy neutrino

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