Direct CP Violation in K_L --> π^0 e^+e^- Beyond Leading Logarithms

Details Direct CP Violation in K_L --> π^0 e^+e^- Beyond Leading Logarithms Direct CP Violation in K_L --> π^0 e^+e^- Beyond Leading Logarithms

1994-02-24

arxiv.org/abs/hep-ph/9402347v1

Nucl.Phys.B423:349-383,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

35 pages (with 9 PostScript figures available separately), Munich Technical University preprint TUM-T31-60/94, Max-Planck Inst

Scientific paper

10.1016/0550-3213(94)90138-4

We analyze the direct CP violation in the rare decay K_L --> Pi^0 e+e- with QCD effects taken into account consistently in the next-to-leading order. We calculate the two-loop mixing between the four-quark \Delta S=1 operators and the operator Q_7V = (sd)_(V-A)(ee)_V in the NDR and HV renormalization schemes. Using the known two-loop anomalous dimension matrix of the four-quark operators, we find that the coefficient C_7V(\mu) depends only very weakly on \mu, renormalization scheme and \Lambda_MSbar. The next-to-leading QCD corrections enhance the direct CP violating contribution over its leading order estimate so that it remains dominant in spite of the recent decrease of |V_ub/V_cb| and |V_cb|. We expect typically BR(K_L --> \pi^0 e^+ e^-)_dir ~ 6*10^(-12), although values as high as 10^(-11) are not yet excluded.

Affiliated with

Also associated with

No associations

Rating

Direct CP Violation in K_L --> π^0 e^+e^- Beyond Leading Logarithms 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 Direct CP Violation in K_L --> π^0 e^+e^- Beyond Leading Logarithms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct CP Violation in K_L --> π^0 e^+e^- Beyond Leading Logarithms will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-99597