K → πνν̄ : New Contributions from Unit-Charged Scalars in Topcolor-Assisted Technicolor Models

Abstract

We calculate the new contributions to the rare K-decays K+ + .rr+uL and K L + .rroui7 from the unit-charged scalars appearing in the topcolor-assisted technicolor models. By using the square-root ans@ for the mixing matrices DL and D R , we find that: (a) the new contributions from top-pions ?' and b-pions H' dominate over that from ordinary technipions 7r1 and .rrs; (b) for ag'a; = -114, the enhancements to the ratios B(K+ + .rr+uL) and B ( K L + .rrovF) from new scalars can be as large as a factor 7 and 11, respectively; (c) the theoretical predictions are still consistent with the data afier including the new contributions.

Measurement of the $K^+\toπ^+ν\barν$ Branching Ratio

“…There have been numerous predictions for K + → π + ν ν in the models beyond the SM and applications of the measured branching ratio to constrain new models. These include the Minimal Supersymmetric Standard Model with [21,22] and without [22,23] new sources of flavor-or CP-violation, generic SUSY with minimal particle content [24], SUSY with non-universal A terms [25], SUSY with broken R-parity [26,27], topcolor [28], topcolor-assisted technicolor models [29,30], multiscale walking technicolor [31], four generation models [32], leptoquarks [33], Left-Right model with right-handed Z ′ [34], extension of the SM to a gauge theory with J = 0 mesons [35], a multi-Higgs multiplet model [36], light sgoldstinos [37], universal extra dimensions [38], 5-dimensional split fermions [39], a Randell-Sundrum scenario [40], a littlest Higgs model [41,42], non-standard neutrino interactions [43], and a minimal 3-3-1 model [44].…”

Measurement of theK+→π+νν¯branching ratio

“…in the models beyond the SM and applications of the measured branching ratio to constrain new models. These include the minimal supersymmetric standard model with [21,22] and without [22,23] new sources of flavor or CP violation, generic supersymmetry (SUSY) with minimal particle content [24], SUSY with nonuniversal A terms [25], SUSY with broken R parity [26,27], topcolor [28], topcolor-assisted technicolor models [29,30], multiscale walking technicolor [31], four generation models [32], leptoquarks [33], left-right model with right-handed Z 0 [34], extension of the SM to a gauge theory with J 0 mesons [35], a multi-Higgs multiplet model [36], light sgoldstinos [37], universal extra dimensions [38], 5-dimensional split fermions [39], a Randell-Sundrum scenario [40], a littlest Higgs model [41,42], nonstandard neutrino interactions [43], and a minimal 3-3-1 model [44].…”