[SEMINARI]: Dr. Jamin: change of time of seminar.

[Arcadi Santamaria]

After consulting the people we have decided to change the time of
seminars. Since now on they will be on thursday at 11:30, in particular
the seminar by Dr. Jamin this thusday.
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                              S E M I N A R I

        [Image]        Departament de Física Teòrica         [Image]
                  Universitat de València - IFIC (UV-CSIC)
                      46100 Burjassot (València) Spain

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       STANDARD MODEL CONFRONTING NEW RESULTS FOR EPSILON-PRIME / EPSILON.

                               Matthias Jamin

                             (Univ. Heidelberg)

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         Sala de Juntes de l'edifici de l'IFIC a Paterna, primer pis
                 Thursday 07 of October of 1999 at 11:30 AM
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                                    Resum

   We analyze the CP violating ratio \epe=epsilon'/epsilon in the Standard
 Model in view of the new experimental results. We review the present status
 of the most important non-perturbative parameters B_6, B_8, B_K and of the
  strange quark mass m_s. We also briefly discuss the issues of final state
 interactions and renormalization scheme dependence. Updating the values of
 the CKM parameters, of m_t and Lambda (MSbar) and using Gaussian errors for
the experimental input and flat distributions for the theoretical parameters
       we find \epe substantially below the NA48 and KTeV data: \epe=
(7.7^{+6.0}_{-3.5}) 10^{-4} and \epe= (5.2^{+4.6}_{-2.7}) 10^{-4} in the NDR
 and HV renormalization schemes respectively. A simple scanning of all input
  parameters gives on the other hand 1.05 10^{-4} < \epe < 28.8 10^{-4} and
0.26 10^{-4} < \epe < 22.0 10^{-4} respectively. Analyzing the dependence on
 various parameters we find that only for extreme values of B_6, B_8 and m_s
 and suitable values of CKM parameters and Lambda(MSbar), the ratio \epe can
  be made consistent with data. We analyze the impact of these data on the
  lower bounds for Im(V_{td}V_{ts}^*), Br(K_L to pi^0 nu barnu), Br(K_L to
   pi^0e^+e^-)_{dir} and on tan(beta) in the Two Higgs Doublet Model II.

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