T -odd asymmetries in radiative top-quark decays
نویسندگان
چکیده
We study the angular distribution of the charged lepton in the top-quark decay into a bottom quark and a W boson which subsequently decays into lνl, when a hard gluon is radiated off. The absorptive part of the t → bWg decay amplitudes, which gives rise to T -odd asymmetries in the distribution, is calculated at the one-loop level in perturbative QCD. The asymmetries at a few percent level are predicted, which may be observable at future colliders.
منابع مشابه
A Note on the QCD Corrections to Forward–Backward Asymmetries of Heavy–Quark Jets in Z Decays
The measurement of the forward-backward asymmetries of heavy quarks provides one of the most precise determinations of sin θW in Z decays. We discuss in detail the one–loop QCD radiative corrections to these asymmetries. Results are given for single heavy–quark jet asymmetries and asymmetries of the thrust axis, as well as for heavy–quark two–jet final states.
متن کاملTransverse Tau Polarization in Decays of the Top and Bottom Quarks in the Weinberg Model of CP Non-conservation*
We show that the transverse polarization asymmetry of the r-lepton in the decay t + bra is extremely sensitive to CP violating phases arising from the charged Higgs exchange in the Weinberg model of CP non-conservation. Qualitatively, the polarization asymmetries are enhanced over rate or energy asymmetries by a factor of x % x O(100). Thus for optimal values of the parameters the method m, req...
متن کاملThe Supersymmetric QCD Radiative Corrections to Top Quark Semileptonic Decays
The one-loop supersymmetric QCD corrections to the top quark semileptonic decays t → b l̄ νl are considered. The corrections are found to reduce the decay width. In the still acceptable parameter space the corrections to the percentage change in top quark semileptonic decay width can reach the level of -0.7%. PACS numbers: 11.30.Pb, 12.38.Bx, 14.65.Ha Keyword(s): SUSY QCD, RADIATIVE CORRECTIONS,...
متن کاملTransverse tau polarization in decays of the top and botton quarks in the Weinberg model of CP nonconservation.
We show that the transverse polarization asymmetry of the τ -lepton in the decay t→ bτν is extremely sensitive to CP violating phases arising from the charged Higgs exchange in the Weinberg model of CP non-conservation. Qualitatively, the polarization asymmetries are enhanced over rate or energy asymmetries by a factor of ≈ mt mτ ≈ O(100). Thus for optimal values of the parameters the method re...
متن کاملar X iv : h ep - p h / 06 07 15 1 v 2 30 N ov 2 00 6 T - odd correlations in radiative K + l 3 decays and chiral perturbation theory
The charged kaon decay channel K l3γ allows for studies of direct CP violation, possibly due to non-standard mechanisms, with the help of T -odd correlation variables. In order to be able to extract a CP -violating signal from experiment, it is necessary to understand all possible standard model phases that also produce T -odd asymmetries. We complement earlier studies by considering strong int...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2007