منابع مشابه
Two-loop QCD corrections to top quark decay
It is well-known that the top quark is the heaviest fermion in the Standard Model. An immediate consequence of that fact is its very short lifetime which turns out to be shorter than the characteristic timescale of nonperturbative QCD effects. Thanks to this feature, the top behaves almost like a free quark, which is really a unique situation in QCD. Moreover, the process t → bW is an absolutel...
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We have calculated the one-loop electroweak corrections to the decay t→ bW, including the counterterm for the CKM matrix elements Vtb. Previous calculations used an incorrect δVtb that led to a gauge dependent amplitude. However, since the contribution stemming from δVtb is small, those calculations only underestimate the width by roughly one part in 10. PACS number(s): 12.15.Lk, 11.10.Gh, 12.1...
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We present the energy distribution of b-flavoured hadrons in top quark decay using the PYTHIA and HERWIG event generators, which we tune to LEP and SLD data. We find that fitting the string and cluster models is essential to reproduce the ee data and to reliably predict B-hadron production in top decay. We also compare the PYTHIA and HERWIG results with the ones yielded by resummed calculations...
متن کاملMeasurements of top quark decay properties
I report on measurements of the properties of the top quark using data collected by the CDF and DØ detectors during Run II of the Fermilab Tevatron. The helicity of the W boson arising from top quark decay, the top quark decay branching ratios, and the top quark charge have all been measured, and the results in all cases are consistent with standard model expectations.
متن کاملQcd Flavour Changing Top Quark Decay
We present a detailed and complete calculation of the gluino and scalar quarks contribution to the flavour-changing top quark decay into a charm quark and a photon, gluon, or a Z 0 boson within the minimal supersymmetric standard model including flavour changing gluino-quarks-scalar quarks couplings in the right-handed sector. We compare the results with the ones presented in an earlier paper w...
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ژورنال
عنوان ژورنال: Visión electrónica
سال: 2019
ISSN: 2248-4728,1909-9746
DOI: 10.14483/22484728.15185