Leptonic Decay of Hyperons in an Intermediate-Boson Theory

1964 ◽  
Vol 136 (5B) ◽  
pp. B1522-B1524
Author(s):  
Seitaro Nakamura ◽  
Kunio Itami
Keyword(s):  
Leptonic Decay ◽  
Intermediate Boson ◽  
Boson Theory

scholarly journals AN INTERMEDIATE BOSON THEORY (Ⅱ)——THE NONLEPTONIC DECAYS OF HYPERONS

1966 ◽  
Vol 22 (9) ◽  
pp. 1032
Author(s):  
YANG KUO-SHEN ◽  
LU TAN ◽  
LO LIAU-FU
Keyword(s):  
Intermediate Boson ◽  
Boson Theory ◽  
Nonleptonic Decays

scholarly journals AN INTERMEDIATE BOSON THEORY (Ⅰ)——BASIC HYPOTHESES AND SYMMETRIES

1966 ◽  
Vol 22 (9) ◽  
pp. 1027
Author(s):  
YANG KUO-SHEN ◽  
LO LIAU-FU ◽  
LU TAN
Keyword(s):  
Intermediate Boson ◽  
Boson Theory

Intermediate Boson Theory in the Super-Weak Coupling with Neutrino

1965 ◽  
Vol 33 (2) ◽  
pp. 290-306
Author(s):  
Seitaro Nakamura ◽  
Kunio Itami
Keyword(s):  
Weak Coupling ◽  
Intermediate Boson ◽  
Boson Theory

Reactionμ+N→e+N′: Intermediate Boson Theory

1960 ◽  
Vol 5 (10) ◽  
pp. 478-480 ◽  
Author(s):  
Frederick J. Ernst
Keyword(s):  
Intermediate Boson ◽  
Boson Theory

Resonance effects in intermediate boson theory

1961 ◽  
Vol 19 (4) ◽  
pp. 837-839 ◽  
Author(s):  
P. T. Matthews ◽  
A. Salam
Keyword(s):  
Intermediate Boson ◽  
Resonance Effects ◽  
Boson Theory

scholarly journals Search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c.

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
◽  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
...  
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Center Of Mass ◽  
Leptonic Decay ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Electron Positron

Abstract Using 10.1 × 109J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy $$ \sqrt{s} $$ s = 3.097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ(J/ψ → D−e+νe + c. c.) < 7.1 × 10−8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.

scholarly journals Contribution of the Darwin operator to non-leptonic decays of heavy quarks

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Alexander Lenz ◽  
Maria Laura Piscopo ◽  
Aleksey V. Rusov
Keyword(s):  
Standard Technique ◽  
Quark Propagator ◽  
Leptonic Decay ◽  
Leptonic Decays ◽  
Interference Contribution ◽  
The Standard Model ◽  
Strength Tensor ◽  
Quark Flavour ◽  
Quark Decay ◽  
B Quark

Abstract We compute the Darwin operator contribution ($$ 1/{m}_b^3 $$ 1 / m b 3 correction) to the width of the inclusive non-leptonic decay of a B meson (B+, Bd or Bs), stemming from the quark flavour-changing transition b → $$ {q}_1{\overline{q}}_2{q}_3 $$ q 1 q ¯ 2 q 3 , where q1, q2 = u, c and q3 = d, s. The key ideas of the computation are the local expansion of the quark propagator in the external gluon field including terms with a covariant derivative of the gluon field strength tensor and the standard technique of the Heavy Quark Expansion (HQE). We confirm the previously known expressions of the $$ 1/{m}_b^3 $$ 1 / m b 3 contributions to the semi-leptonic decay b → $$ {q}_1\mathrm{\ell}{\overline{\nu}}_{\mathrm{\ell}} $$ q 1 ℓ ν ¯ ℓ , with ℓ = e, μ, τ and of the $$ 1/{m}_b^2 $$ 1 / m b 2 contributions to the non-leptonic modes. We find that this new term can give a sizeable correction of about −4 % to the non-leptonic decay width of a B meson. For Bd and Bs mesons this turns out to be the dominant correction to the free b-quark decay, while for the B+ meson the Darwin term gives the second most important correction — roughly 1/2 to 1/3 of the phase space enhanced Pauli interference contribution. Due to the tiny experimental uncertainties in lifetime measurements the incorporation of the Darwin term contribution is crucial for precision tests of the Standard Model.

scholarly journals Leptonic decay constants and in three flavor lattice QCD

2005 ◽  
Vol 140 ◽  
pp. 443-445 ◽  
Author(s):  
J.N. Simone ◽  
C. Aubin ◽  
C. Bernard ◽  
C. DeTar ◽  
M. di Pierro ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Leptonic Decay ◽  
Decay Constants
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