منابع مشابه
A global fit of top quark effective theory to data
In this paper we present a global fit of beyond the Standard Model (BSM) dimension six operators relevant to the top quark sector to all currently available top production cross-section measurements, namely parton-level top-pair and single top production at the LHC and the Tevatron. Higher order QCD corrections are modelled using differential and global K-factors, and we use novel fast-fitting ...
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Of the particles seen so far in collider experiments, the top quark is no doubt the most expensive, and the most glamorous. It is therefore the center of attention at the Tevatron and the LHC, until of course a new star, Higgs, comes along. Expressed less colloquially, the top quark is considered an interesting study object because it has many quantum numbers and thus couples to almost all othe...
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We present updated results for the CKM matrix elements from a global fit to flavour physics data within the standard model theoretical context. We emphasise recent improvements on the determination of the CKM parameters λ and A as well as on the angle γ of the unitarity triangle.
متن کاملEffective Heavy Quark Theory
We show how heavy quark effective theory, including 1 MQ corrections, may be matched onto dynamical quark models by making a specific choice of Kμ,m and vμ in the pμ = mvμ + Kμ expansion. We note that Wigner rotations of heavy quark spins arise at O(p2/m2) in non-relativistic models but at O(ΛQCD/MQ) or O(velocity − transfer) in HQET and so are necessary for a consistent treatment. May 1992 FEC...
متن کاملLight Quark Effective Theory
The application of effective field theory methods to the low energy structure of QCD is discussed. The analysis relies on the fact that three of the quark masses happen to be light, so that QCD exhibits an approximate chiral symmetry. The Goldstone bosons associated with the spontaneous breakdown of this symmetry represent the essential degrees of freedom at low energies. I emphasize the univer...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2015
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.92.091501