O ct 1 99 7 BNL - 64627 PRINCETON / HEP / 97 - 11 TRI – PP – 97 – 27 KEK Preprint 97 - 114 Observation of the Decay K + → π + μ + μ −

Bnl - 68328 Princeton / Hep / 2001 - 1 Tri – Pp –

We have performed a search for the angular-momentum forbidden decay K+→π+γ with the E787 detector at BNL. No events were observed in the π+ kinematic region around 227 MeV/c. An upper limit on the branching ratio for the decay is determined to be 3.6× 10−7 at 90% confidence level. Typeset using REVTEX

KEK Preprint 97 - 113 Observation of the Decay K + → π + γγ

The first observation of the decay K+ → π+γγ is reported. A total of 31 events was observed with an estimated background of 5.2±3.3 events in the π+ momentum range from 100 MeV/c to 180 MeV/c. The corresponding partial branching ratio, B(K+ → π+γγ, 100 MeV/c < Pπ+ < 180 MeV/c), is (6.0±1.4{stat}±0.7{sys})×10−7. No K+ → π+γγ decay was observed in the π+ momentum region greater than 215 MeV/c. Th...

0 v 1 7 J ul 1 99 7 KEK CP - 056 KEK Preprint 97 - 68 AUTOMATIC CALCULATION OF COMPLETE

ar X iv : h ep - p h / 97 10 23 0 v 1 3 O ct 1 99 7 KEK - TH - 546 Oct . ’ 97 Domain wall solution for vectorlike model

Domain wall solution for Nc = Nf supersymmetric QCD is constructed. Astrophysical implications of the domain wall configuration is also discussed. [email protected] 1

Implication of improved upper bounds on |1L| = 2 processes

We discuss implications of improved upper bounds on the |1L| = 2 processes (i) K+ → π−μ+μ+, from an experiment at BNL, and (ii) μ− → e+ conversion, from an experiment at PSI. In particular, we address the issue of constraints on neutrino masses and mixing, and on supersymmetric models with R-parity violation.  2000 Published by Elsevier Science B.V. PACS: 13.20.Eb; 14.60.Pq; 14.60.St; 14.80.Ly...