Constraints on New Physics from $K \to πν\barν$

Details Constraints on New Physics from $K \to πν\barν$ Constraints on New Physics from $K \to πν\barν$

2004-07-02

arxiv.org/abs/hep-ph/0407021v3

Phys.Rev. D70 (2004) 093003

Physics

High Energy Physics

High Energy Physics - Phenomenology

K_L --> pi^0 e+ e- section has been altered, new references to this process are cited. One Figure has been removed and other F

Scientific paper

10.1103/PhysRevD.70.093003

We study constraints on new physics from the recent measurement of Br ($K^+ \to \pi^+ \nu \bar \nu)$ by the E787 and E949 Collaborations. In our analysis we consider two models of new physics: $(a)$ extra down type singlet quark model (EDSQ) and $(b)$ R-parity violating Minimal Supersymmetric Standard Model(MSSM). We find that $K^+\to \pi^+ \nu\bar \nu$ along with other processes like $K_L \to \mu^+ \mu^-, \epsilon^\prime/\epsilon $ provide useful bounds on the parameter $U_{sd}$, characterizing the off-diagonal $Z-d-\bar s $ coupling of model $(a)$. The bounds on the ${\rm Re}(U_{sd})$ from $(K_L \to \mu^+\mu^-)_{\rm SD}$ and ${\rm Im}(U_{sd})$ from $\epsilon^\prime/\epsilon$ are so tight that the branching ratio of $K^+\to \pi^+ \nu \bar \nu $ can exceed the standard model value by at most a factor of two For model b), we also obtain stringent bounds on certain combinations of product of two $\lp_{ijk}$ couplings originating from $L$ number violating operator $ L_i Q_j D^c_k $ using $K^+ \to \pi^+ \nu \bar \nu $ and $K_L \to \mu^+ \mu^-$ processes. Even with the stringent constraints on $U_{sd}$ (in model $(a)$) and on products of two $\rp$couplings (model $(b)$), we find that the branching ratios for $K_L \to \pi^0 \nu \bar \nu$ and $K_L \to \pi^0 e^+ e^-$ can be substantially different in both the above models from those predicted in the standard model.

Affiliated with

Also associated with

No associations

Rating

Constraints on New Physics from $K \to πν\barν$ 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 Constraints on New Physics from $K \to πν\barν$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on New Physics from $K \to πν\barν$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-203732