Zobrazeno 1 - 10
of 1 005
pro vyhledávání: '"Koerner J"'
Autor:
Groote, S., Körner, J. G.
Publikováno v:
Nucl. Phys. B938 (2018) 416-425
We integrate three-loop sunrise-type vacuum diagrams in $D_0=4$ dimensions with four different masses using configuration space techniques. The finite parts of our results are in numerical agreement with corresponding three-loop calculations in momen
Externí odkaz:
http://arxiv.org/abs/1804.10570
Publikováno v:
Phys. Rev. D 97, 094008 (2018)
We compute the next-to-next-to-leading order (NNLO) QCD corrections to the decay $t(\uparrow) \to X_b +W^+$ of a polarized top quark. The spin-momentum correlation in this quasi two-body decay is described by the polar angle distribution $\mathrm{d}\
Externí odkaz:
http://arxiv.org/abs/1803.03658
Publikováno v:
Phys. Rev. D 97, 093001 (2018)
We identify the $T$-odd structure functions that appear in the description of polarized top quark decays in the sequential decay $t(\uparrow) \to X_b+W^+(\to \ell^+ + \nu_\ell)$ (two structure functions) and the quasi-three-body decay $t(\uparrow) \t
Externí odkaz:
http://arxiv.org/abs/1802.02492
Autor:
Groote, S., Körner, J. G.
Publikováno v:
Phys. Rev. D 96, 111301 (2017)
We derive a positivity bound on the right-chiral tensor coupling Im $g_R$ in polarized top quark decay by analyzing the angular decay distribution of the three-body polarized top quark decay $t(\uparrow)\to b+\ell^+ +\nu_\ell$ in NLO QCD. We obtain t
Externí odkaz:
http://arxiv.org/abs/1711.06432
Autor:
Groote, S., Körner, J. G.
Publikováno v:
Journal of Physics: Conference Series 938 (2018) 012053
We report on the status of an ongoing calculation of the NLO electroweak corrections to sequential polarized top quark decays $t(\uparrow) \to X_b +W^+ (\to \ell^+ +\nu_\ell)$.
Comment: 10 pages, 2 figures. Contribution to the proceedings of the
Comment: 10 pages, 2 figures. Contribution to the proceedings of the
Externí odkaz:
http://arxiv.org/abs/1710.07758
Publikováno v:
Phys. Rev. D 94, 114003 (2016)
We provide analytical results for the $O(\alpha_s)$ corrections to the double-spin density matrix elements in the reaction $e^+e^-\to t\bar t$. These concern the elements $ll$, $lt$, $ln$, $tt$, $tn$, and $nn$ of the double-spin density matrix elemen
Externí odkaz:
http://arxiv.org/abs/1609.03741
Autor:
Körner, J. G.
I discuss how to obtain angular decay distributions for sequential cascade decays using helicity methods. The angular decay distributions follow from a reasonably simple master formula involving bilinear forms of helicity amplitudes and Wigner's $d$
Externí odkaz:
http://arxiv.org/abs/1402.2787
Publikováno v:
Phys. Rev. D 90, 054028 (2014)
We calculate the next-to-leading order QCD corrections to the perturbative term in the operator product expansion of the spectral functions of light tetraquark currents. By using also configuration space methods we keep the momentum space four-loop c
Externí odkaz:
http://arxiv.org/abs/1401.4801
Publikováno v:
Phys. Part. Nucl. 45 (2014) 214-216
We discuss the polar angle decay distribution in the decay of on-shell and off-shell polarized (W,Z) gauge bosons into massive quark pairs. In particular for the off-shell decays in $H \to (W,Z) + (W^\ast,Z^\ast) (\to q_1\bar q_2)$ it is important to
Externí odkaz:
http://arxiv.org/abs/1301.5217
Publikováno v:
Eur. Phys. J. C73 (2013) 2454
We provide analytical $O(\alpha_s)$ results for the three polarized decay structure functions $H_{++},\,H_{00}$ and $H_{--}$ that describe the decay of a polarized $W$ boson into massive quark--antiquark pairs. As an application we consider the decay
Externí odkaz:
http://arxiv.org/abs/1301.0881