An upgraded analysis of ɛ′/ɛ at the next-to-leading order

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

doi:10.1007/bf01566672

Cited by 179 publications

(382 citation statements)

References 63 publications

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“…In spite of some differences in the treatment of hadronic matrix elements our results for ε ′ /ε, with m s (m c ) = 150 ± 20 MeV, using the second method agree well with the results of the Rome group [16]. On the other hand the range in (11) In [18] the hadronic matrix elements relevant for ε ′ /ε have been calculated within the chiral quark model.…”

supporting

confidence: 82%

“…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. An analysis of ε ′ /ε with different treatments of hadronic matrix elements can be found in [17][18][19] and will be briefly discussed below.…”

mentioning

confidence: 70%

“…The purpose of the present letter is to update our 1993 analysis and to confront our new result with the one of the Rome group [16] and with [17][18][19].…”

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confidence: 99%

“…The first method is the one used in our 1993 paper as well as in [37]. The second method is similar to the one used by the Rome group [16] except that these authors assume a flat distribution (with a width of 2σ) for the theoretical quantities. Whereas the first method is even more conservative than adding all errors for the various input parameters linearly, the second method yields a similar error estimate as if all errors would have been added in quadrature.…”

mentioning

confidence: 99%

“…ε ′ /ε is generally lower in the HV scheme if the same values for B we think it is sufficient to present only the results in the NDR scheme here. The results in the HV scheme can be found in [7,16].…”

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confidence: 99%

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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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supporting

confidence: 82%

mentioning

confidence: 70%

“…The purpose of the present letter is to update our 1993 analysis and to confront our new result with the one of the Rome group [16] and with [17][18][19].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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

Buras¹,

Jamin²,

Lautenbacher³

1996

Physics Letters B

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Weak Matrix Elements on the Lattice: Recent Developments in K-Physics

Talevi¹

1997

NATO ASI Series

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Lattice matrix elements and CP violation inB andK physics: Status and outlook

Soni

2004

Pramana - J Phys

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Status of lattice calculations of hadron matrix elements along with CP violation in B and in K systems is reviewed. Lattice has provided useful input which, in conjunction with experimenatl data, leads to the conclusion that CP-odd phase in the CKM matrix plays the dominant role in the observed asymmetry in B → ψK s . It is now quite likely that any beyond the SM, CP-odd, phase will cause only small deviations in B-physics. Search for the effects of the new phase(s) will consequently require very large data samples as well as very precise theoretical predictions. Clean determination of all the angles of the unitarity triangle therefore becomes essential. In this regard B → KD 0 processes play a unique role. Regarding K-decays, remarkable progress made by theory with regard to maintenance of chiral symmetry on the lattice is briefly discussed. First application already provide quantitaive information on B K and the ∆I = 1/2 rule. The enhancement in ReA 0 appears to arise solely from tree operators, esp. Q 2 ; penguin contribution to ReA 0 appears to be very small. However, improved calculations are necessary for ǫ ′ /ǫ as there the contributions of QCD penguins and electroweak penguins largely seem to cancel. There are good reasons, though, to believe that these cancellations will not survive improvements that are now underway. Importance of determining the unitarity triangle purely from K-decays is also emphasized. I IntroductionWith important input from the lattice along with the classic results of indirect CP violation in K L → ππ, the asymmetric B-factories with measurements of CP asymmetry in B → ψK s are providing valuable support to the CKM paradigm of CP violation [1]. It is now clear that the CP-odd phase in the CKM matrix is the dominant source of CP violation in B → ψK s . However, as is well known essentially compelling theoretical arguements suggest that new CP-odd phase(s) 0

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An upgraded analysis of ɛ′/ɛ at the next-to-leading order

Cited by 179 publications

References 63 publications

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

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

Weak Matrix Elements on the Lattice: Recent Developments in K-Physics

Lattice matrix elements and CP violation inB andK physics: Status and outlook

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