Publications (2)0 Total impact
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ABSTRACT: The CLAS detector was used to obtain the first ever measurement of the
electromagnetic decay of the $\Sigma^{*+}(1385)$ from the reaction $\gamma p
\to K^0 \Sigma^{*+}(1385)$. A real photon beam with a maximum energy of 3.8 GeV
was incident on a liquid-hydrogen target, resulting in the photoproduction of
the kaon and $\Sigma^*$ hyperon. Kinematic fitting was used to separate the
reaction channel from the background processes. The fitting algorithm exploited
a new method to kinematically fit neutrons in the CLAS detector, leading to the
partial width measurement of $250.0\pm56.9(stat)^{+34.3}_{-41.2}(sys)$ keV. A
U-spin symmetry test using the SU(3) flavor-multiplet representation yields
predictions for the $\Sigma^{*+}(1385)\to\Sigma^{+}\gamma$ and
$\Sigma^{*0}(1385)\to\Lambda\gamma$ partial widths that agree with the
experimental measurements.
11/2011;
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ABSTRACT: The electromagnetic decay $\Sigma^0(1385) \to \Lambda \gamma$ was studied
using the CLAS detector at the Thomas Jefferson National Accelerator Facility.
A real photon beam with a maximum energy of 3.8 GeV was incident on a proton
target, producing an exclusive final state of $K^+\Sigma^{*0}$. We report the
decay widths ratio $\Sigma^0(1385) \to \Lambda\gamma$/ $\Sigma^0(1385) \to
\Lambda\pi^0$ = $1.42 \pm 0.12(\text{stat})_{-0.07}^{+0.11}(\text{sys})$%. This
ratio is larger than most theoretical predictions by factors ranging from
1.5-3, but is consistent with the only other experimental measurement. From the
reported ratio we calculate the partial width and electromagnetic transition
magnetic moment for $\Sigma^0(1385) \to \Lambda\gamma$.
03/2011;
