scholarly journals Weak inelastic production and leptonic decays of heavy leptons

1973 ◽  
Author(s):  
A. Soni
Keyword(s):  
Leptonic Decays ◽  
Heavy Leptons

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 NLO QCD + EW corrections toZZZproduction with subsequent leptonic decays at the LHC

2016 ◽  
Vol 43 (11) ◽  
pp. 115001 ◽  
Author(s):  
Wang Hong ◽  
Zhang Ren-You ◽  
Ma Wen-Gan ◽  
Guo Lei ◽  
Li Xiao-Zhou ◽  
...  
Keyword(s):  
Leptonic Decays

scholarly journals AssociatedZ0H0production with leptonic decays at the LHC in next-to-leading order QCD

2012 ◽  
Vol 86 (3) ◽  
Author(s):  
Zhang Shi-Ming ◽  
Zhang Ren-You ◽  
Ma Wen-Gan ◽  
Guo Lei
Keyword(s):  
Leading Order ◽  
Leptonic Decays

scholarly journals Pair production of the heavy leptons associated with a gauge boson γ or Z at the ILC

2012 ◽  
Vol 860 (1) ◽  
pp. 152-166 ◽  
Author(s):  
Qing-Guo Zeng ◽  
Chong-Xing Yue ◽  
Jiao Zhang
Keyword(s):  
Pair Production ◽  
Gauge Boson ◽  
Heavy Leptons

scholarly journals NLO QCD corrections to W±Zγ production with leptonic decays

2011 ◽  
Vol 696 (4) ◽  
pp. 380-385 ◽  
Author(s):  
G. Bozzi ◽  
F. Campanario ◽  
M. Rauch ◽  
H. Rzehak ◽  
D. Zeppenfeld
Keyword(s):  
Leptonic Decays
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