Date: Friday September 13, 2013 at 1pm

Location: 223 Herman Brown Hall, Rice University
Title: The Search for a CP-Odd Light Higgs Boson in $\Upsilon(1S)$ Data at Belle
Speaker: Jamal Rorie (Univ. of Hawai’i)
Abstract: We conduct a search for a CP-odd light Higgs, $A^0$, in a sample of $(102\pm2) \times10^{6}$ $\Upsilon(1S)$ by looking for $\Upsilon(1S) \rightarrow \gamma A^0$ radiative decays with $A^0\rightarrow\tau^+\tau^-$.  No significant evidence of such decays is found. We set an 90\% confidence level upper limit on $BR(\Upsilon(1S)\rightarrow\gamma A^0) \times BR(A^0\rightarrow\tau^+\tau^-)$ between $4.0\times10^{-6}$ to $4.5\times10^{-5}$ for $A^0$ masses ranging from 3.6 GeV to 9.3 GeV.  This represents a twofold improvement on current world limits for using $\Upsilon(1S)$ from $e^+e^-\rightarrow\Upsilon(1S)$ production and is in agreement with recent limits using $\Upsilon(1S)$ from $\Upsilon(3S)\rightarrow\pi\pi\Upsilon(1S)$ decays.
Host: Paul Padley