ar X iv : h ep - p h / 03 06 21 7 v 2 2 2 Ja n 20 04 TUM
نویسندگان
چکیده
During the last four years several parameters relevant for the analysis of the CP-violating ratio ε/ε improved and/or changed significantly. In particular, the experimental value of ε/ε and the strange quark mass decreased, the uncertainty in the CKM factor has been reduced, and for a value of the hadronic matrix element of the dominant electroweak penguin operator Q8, some consensus has been reached among several theory groups. In view of this situation, ten years after the first analyses of ε/ε at the next-to-leading order, we reconsider the analysis of ε/ε within the SM and investigate what can be said about the hadronic Q6 matrix element of the dominant QCD penguin operator on the basis of the present experimental value for ε/ε and todays values of all other parameters. Employing a conservative range for the reduced electroweak penguin matrix element R8 = 1.0±0.2 from lattice QCD, and present values for all other input parameters, on the basis of the current world average for ε/ε, we obtain the reduced hadronic matrix element of the dominant QCD penguin operator R6 = 1.23 ± 0.16 implying 〈Q6〉 0 (mc) ≈ − 0.8 〈Q8〉 2 (mc). We compare these results with those obtained in large–Nc approaches in which generally R6 ≈ R8 and 〈Q6〉 0 (mc) is chirally suppressed relatively to 〈Q8〉 2 (mc). We present the correlation between R6 and R8 that is implied by the data on ε /ε provided new physics contributions to ε/ε can be neglected. PACS: 12.15.y, 13.25.Es, 11.30.Er
منابع مشابه
ar X iv : h ep - e x / 05 01 05 7 v 1 2 1 Ja n 20 05 UCHEP - 04 - 03 φ 2 Measurement Using B → ρπ decays at Belle
We present measurements of time-dependent asymmetries in decays of neutral B mesons to the final states B 0 → ρ ± π ∓. Measurements are based on a 140 f b −1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e + e − collider.
متن کاملar X iv : h ep - t h / 03 11 02 3 v 2 2 6 Ja n 20 04 SUBATECH – 2003 – 06 Weak Supersymmetry
We explore “weak” supersymmetric systems whose algebra involves, besides Poincare generators, extra bosonic generators not commuting with supercharges. This allows one to have inequal number of bosonic and fermionic 1–particle states in the spectrum. Coleman–Mandula and Haag–Lopuszanski–Sohnius theorems forbid the presence of such extra bosonic charges in interacting theory for d ≥ 3. However, ...
متن کاملar X iv : h ep - t h / 03 01 12 7 v 1 1 7 Ja n 20 03 Supersymmetry in Spaces of Constant Curvature
متن کامل
ar X iv : h ep - t h / 03 06 17 5 v 2 2 9 Ja n 20 04 Superfield algorithm for higher order gauge field theories
We propose an algorithm for the construction of higher order gauge field theories from a superfield formulation within the Batalin-Vilkovisky formalism. This is a generalization of the superfield algorithm recently considered by Batalin and Marnelius. This generalization seems to allow for non-topological gauge field theories as well as alternative representations of topological ones. A five di...
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 2004