at the next-to-leading order in QCD and QED

Ciuchini, M.; Franco, E.; Martinelli, G.; Reina, Laura

doi:10.1016/0370-2693(93)90699-i

Cited by 181 publications

(302 citation statements)

References 34 publications

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“…For a more detailed discussion of this point, see sect. 4. We conclude that, with a central value of ππ|Q 6 |K 0 close to the VSA one, even with a large error, it is difficult to reproduce the experimental value of ε ′ /ε, for which a conspiracy of several inputs pushing ε ′ /ε in the same direction is necessary.…”

Section: Several Features Characterize This Workmentioning

confidence: 74%

Combined analysis of the unitarity triangle and CP violation in the Standard Model

Ciuchini¹,

Franco²,

Giusti³

et al. 2000

Nuclear Physics B

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We perform a combined analysis of the unitarity triangle and of the CP violating parameter ε ′ /ε using the most recent determination of the relevant experimental data and, whenever possible, hadronic matrix elements from lattice QCD. We discuss the rôle of the main non-perturbative parameters and make a comparison with other recent analyses. We use lattice results for the matrix element of Q 8 obtained without reference to the strange quark mass. Since a reliable lattice determination of the matrix element of Q 6 is still missing, the theoretical predictions for ε ′ /ε suffer from large uncertainties. By evaluating this matrix element with the vacuum-saturation approximation, we typically find as central value ε ′ /ε = (4 ÷ 7) × 10 −4 . We conclude that the experimental data suggest large deviation of the value of the matrix element of Q 6 from the vacuum-saturation approximation, possibly due to penguin contractions.

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Section: Several Features Characterize This Workmentioning

confidence: 74%

Combined analysis of the unitarity triangle and CP violation in the Standard Model

Ciuchini¹,

Franco²,

Giusti³

et al. 2000

Nuclear Physics B

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“…A similar NLO analysis has been made by the Rome group [15]. In 1995 the latter group has updated their analysis to predict a very small ratio ε ′ /ε = (3.1 ± 2.5) · 10 −4 [16], essentially consistent with the superweak scenario.…”

mentioning

confidence: 69%

“…In table 4 To summarize, we have presented a new analysis of ε ′ /ε, showing in particular the dependence of this important ratio on various input parameters, in particular the value of m s . Our results are summarized in (11) and (13) for the case m s (m c ) = 150±20 MeV and in (14) and (15) for the case m s (m c ) = 100±20 MeV. Furthermore , table 4 gives values of ε ′ /ε for particular sets of input parameters.…”

mentioning

confidence: 99%

A 1996 analysis of the CP violating ratio ɛ′/ɛ

Buras¹,

Jamin²,

Lautenbacher³

1996

Physics Letters B

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We update our 1993 analysis of the CP violating ratio ε ′ /ε in view of the changes in several input parameters, in particular the improved value of the top quark mass. We also investigate the strange quark mass m s dependence of ε ′ /ε in view of rather low values found in the most recent lattice calculations. A simple scanning of the input parameters within one standard deviation gives the ranges: −1.2 · 10 −4 ≤ ε ′ /ε ≤ 16.0 · 10 −4 and 0 ≤ ε ′ /ε ≤ 43.0 · 10 −4 for m s (m c ) = 150 ± 20 MeV and m s (m c ) = 100 ± 20 MeV respectively. If the experimentally measured numbers and the theoretical input parameters are used with Gaussian errors, we find ε ′ /ε = (3.6 ± 3.4) · 10 −4 and ε ′ /ε = (10.4 ± 8.3) · 10 −4 respectively. We also give results for ImV * ts V td . Analyzing the dependence of ε ′ /ε on various parameters we find that only for m s (m c ) ≤ 100 MeV and a conspiration of other input parameters, values for ε ′ /ε as large as (2 − 4) · 10 −3 and consistent with the NA31 result can be obtained. † Supported by the German Bundesministerium für Bildung und Forschung under contract 06 TM 743 and DFG Project Li 519/2-1.

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“…Following [221], let us again consider two decay scenarios for t andt. In the first one, both t andt decay leptonically 5) while in the second scenario only one of the t ort decays leptonically (see also Eqs. 6.79 and 6.80 in section 6.2.3)…”

Section: Cp-odd Observables In Pp → Tt + Xmentioning

confidence: 99%

“…The SM further predicts that there is an additional CP violation in K L → ππ parameterized by the quantity ǫ ′ . The prediction is that ǫ ′ /ǫ = O(10 −4 ); the theoretical difficulties in determining the hadronic matrix element prevent us from making a more precise estimate [5]. Experimentally ℜe(ǫ ′ /ǫ) may be measured via [6]:…”

Section: Introductionmentioning

confidence: 99%

CP violation in top physics

et al. 2001

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CP violation in top physics is reviewed. The Standard Model has negligible effects, consequently CP violation searches involving the top quark may constitute the best way to look for physics beyond the Standard Model. Non-standard sources of CP violation due to an extended Higgs sector with and without natural flavor conservation and supersymmetric theories are discussed. Experimental feasibility of detecting CP violation effects in top quark production and decays in high energy e + e − , γγ, µ + µ − , pp and pp colliders are surveyed. Searches for the electric, electro-weak and the chromo-electric dipole moments of the top quark in e + e − → tt and in pp → ttX are descibed. In addition, other mechanisms that appear promising for experiments, e.g., tree-level CP violation in e + e − → tth, ttZ, ttν eνe and in the top decay t → bτ ν τ and CP violation driven by s-channel Higgs exchanges in pp, γγ, µ + µ − → tt etc., are also discussed. * A 2-up version of this postscript file may be obtained at the url

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at the next-to-leading order in QCD and QED

Cited by 181 publications

References 34 publications

Combined analysis of the unitarity triangle and CP violation in the Standard Model

Combined analysis of the unitarity triangle and CP violation in the Standard Model

A 1996 analysis of the CP violating ratio ɛ′/ɛ

CP violation in top physics

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