Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-06-20
Nucl.Phys. B564 (2000) 391-429
Physics
High Energy Physics
High Energy Physics - Phenomenology
49 pages, 10 figures. Minor changes in wording, references corrected. To appear in Nuclear Physics B
Scientific paper
10.1016/S0550-3213(99)00600-8
We present a new analysis of the ratio \epsilon'/\epsilon which measures the direct CP violation in K\to\pi\pi decays. We use the 1/N_c expansion within the framework of the effective chiral lagrangian for pseudoscalar mesons. The 1/N_c corrections to the hadronic matrix elements of all operators are calculated at leading order in the chiral expansion. Numerically, doing a simple scanning of the input parameters we find 1.5 \cdot 10^{-4}\leq \epsilon'/\epsilon \leq 31.6\cdot 10^{-4}. We also investigate, in the chiral limit, the 1/N_c corrections to the operator Q_6 at next-to-leading order in the chiral expansion. We find large positive corrections which can further enhance \epsilon'/\epsilon and bring the standard model prediction close to the measured value for central values of the parameters. Our result indicates that a \Delta I=1/2 enhancement may be operative for Q_6 similar to the one of Q_1 and Q_2 which dominate the CP conserving amplitude.
Hambye Thomas
Koehler Gerhard O.
Paschos Emmanuel A.
Soldan Peter H.
No associations
LandOfFree
Analysis of ε'/εin the 1/N_c Expansion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Analysis of ε'/εin the 1/N_c Expansion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analysis of ε'/εin the 1/N_c Expansion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-171646