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\begin{titlepage}
\noindent
%Date:   \today       \\
H1prelim-05-031          \\
%Editors: \myref{mailto:ozerov@mail.desy.de}{D.~Ozerov},
%               \myref{mailto:risler@mail.desy.de}{C.~Risler}\\
%Referees: \myref{mailto:glazov@mail.desy.de}{A.~Glazov},
%          \myref{mailto:kleinwrt@mail.desy.de}{C.~Kleinwort}       \\
\vspace{2cm}
\begin{center}
\begin{Large}
{\bf  H1 Search for a Narrow Baryonic Resonance Decaying to ${\bf K^0_s p(\bar p}$)}
\vspace{2cm}

H1 Collaboration

\end{Large}
%to be presented at\\
%XIIIth International Workshop on\\
%Deep Inelastic Scattering, DIS 2005\\
%April, 2005, Madison
\end{center}

\begin{abstract}
Recently observations of a narrow baryonic state decaying to charged kaons and neutrons or $K^0_s$ mesons and protons have been reported by several experiments. This resonance could be identified as a candidate for the exotic 
$\theta^+(1530)$ pentaquark state. 
The H1 results on the search for the $\theta^+(1530)$ and its antiparticle in 
the invariant mass combinations of $K^0_s$ mesons with protons and 
antiprotons in deep inelastic scattering at HERA are reported. \\

The analysed data was collected in the years 1996 to 2000 by the H1 detector
and corresponds to a luminosity of 75$\rm pb^{-1}$. The kinematic range
$Q^2>5 \rm GeV^2$ and $0.1 < y < 0.6$ is investigated.\\
Upper limits at 95\% confidence level on the cross section
$\sigma(ep\rightarrow e \theta X \rightarrow e K^0 p(\bar p) X)$ 
are extracted as a function of the invariant $K^0_S p$ mass in bins of $Q^2$
for a visible range 
$p_T(K^0_s p)>0.5 \rm GeV$ and $|\eta(K^0_S p)|<1.5$ of the $p K^0$ system.\\
Over the mass range $1.48 < M < 1.7 \rm GeV$ these
upper limits vary between 40 and 120 pb.\\
For comparison with ZEUS upper limits are also extracted for the highest $Q^2$ 
bin, $20 < Q^2 < 100 \rm GeV^2$, 
using a visual $dE/dx$ selection and restricting protons 
to $p(pr)<1.5 \rm GeV$.
At a mass of M=1.522 GeV an upper limit on the $\theta^+$ production 
cross section  of 90 and 116 pb is observed, assuming a detector resolution of
5 and 8 MeV, respectively. 
This upper limit is compatible with the observed cross section of 
$\sigma(ep\rightarrow e \theta^+X \rightarrow eK^0pX)=
125 \pm 27(stat) +36 -28 (syst.) pb$  at $Q^2>20 \rm GeV^2$, 
$0.04 < y <0.95$, preliminary result from the ZEUS collaboration.

\end{abstract}
\end{titlepage}

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\begin{figure}[ht]
\begin{center}
\epsfig{figure=H1prelim-05-031.fig1.eps,width=0.5\textwidth}
\caption{Inclusive $K^0_S$ signal for $Q^2>5 {\rm GeV}^2$. 
%The data is described by a fit of 
%a polynomial describing the background and two gaussians.
We observe $142505 \pm 430  K^0_S$ at a mass of $M= 496.08 \pm 0.03$ MeV
using a fit of a  polynomial describing the background and two gaussians
with a width of $\sigma_1=7.06+-0.07$ MeV and 
$\sigma_2=17.47+-0.02$ MeV, respectively.
\label{k0ssignal}}
\end{center}
\end{figure}

\begin{figure}[hb]
\begin{center}
\epsfig{figure=H1prelim-05-031.fig2.eps,width=0.5\textwidth}
\caption{Inclusive $K^{*}$ signal for $Q^2>5 {\rm GeV}^2$.
The signal is fitted by a convolution of a Breit-Wigner function
with a fixed natural width of 50.9 MeV and a guassian.
We observe $18939 \pm  844$ $K^*$ at a mass of $M=0.891 \pm 0.0007$ GeV.
The gaussian width of $7.79 \pm 2.34$ MeV refelects the detector
resolution.
\label{kstarsignal}}
\end{center}
\end{figure}

\begin{figure}[ht]
\epsfig{figure=H1prelim-05-031.fig3a.eps,width=0.5\textwidth}
\epsfig{figure=H1prelim-05-031.fig3b.eps,width=0.5\textwidth}
\epsfig{figure=H1prelim-05-031.fig3c.eps,width=0.5\textwidth}
\caption{
Invariant $K^0_S p(\bar p)$ mass spectra for the standard H1 $dE/dx$ selection
in bins of $Q^2$, which are used for the limit extraction.
The full line shows the result from the fit of a 
background function to the data. The mass spectra show upward 
fluctuations at different masses but no significant peak is observed.
\label{massspectra}}
\end{figure}

\begin{figure}[hb]
\begin{center}
\epsfig{figure=H1prelim-05-031.fig4.eps,width=0.8\textwidth}
\caption{Upper limits on the cross section 
$\sigma_{U.L.}(ep \rightarrow e \theta^+ X \rightarrow e K^0 p(\bar p) X)$
at 95\% confidence level in bins of $Q^2$ in the visible range
$p_T(K^0_s p)>0.5 \rm GeV$ and $|\eta(K^0_S p)|<1.5$.
The full and dashed line represents the limit assuming a 
detector resolution of 5 and 8 MeV, respectively. 	
\label{limits}}
\end{center}
\end{figure}

\begin{figure}[ht]
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\epsfig{figure=H1prelim-05-031.fig5a.eps,width=0.5\textwidth}
\epsfig{figure=H1prelim-05-031.fig5b.eps,width=0.5\textwidth}
\caption{Upper limits on the cross section 
$\sigma_{U.L.}(ep \rightarrow e \theta^+ X \rightarrow e K^0 p X)$
at 95\% confidence level in bins of $Q^2$ for $K^0_s p$ (left) 
and $K^0_s \bar p$  (right)
separately.
\label{limits_charges}}
\end{figure}


\begin{figure}[hb]

\epsfig{figure=H1prelim-05-031.fig6a.eps,width=0.5\textwidth}\\
\epsfig{figure=H1prelim-05-031.fig6b.eps,width=0.5\textwidth}
\epsfig{figure=H1prelim-05-031.fig6c.eps,width=0.5\textwidth}
\caption{
Invariant $K^0_S p$ mass spectra in the highest $Q^2$ bin, 
$20 < Q^2 < 100 \rm GeV^2$, for the low momentum $dE/dx$ selection,
where instead of likelihoods a visual $dE/dx$ selection and
an upper momentum cut $p(pr) < 1.5 \rm GeV$ is applied.
The upper left plot shows the invariant mass for $K^0_s p$ and $K^0_s \bar p$ 
combinations, the lower left and right plot the mass spectra for
the positive and negative combinations, respectively.
\label{massspectra_zeusselection}}
\end{figure}

\begin{figure}[hb]
\epsfig{figure=H1prelim-05-031.fig7.eps,width=1\textwidth}
\caption{Upper limits on the cross section 
$\sigma_{U.L.}(ep \rightarrow e \theta^+ X \rightarrow e K^0 p(\bar p) X)$
at 95\% confidence level for $20 < Q^2 <100 GeV^2$ 
and the low momentum $dE/dx$ selection.
\label{limits2}}
\end{figure}

\begin{figure}[hb]
\epsfig{figure=H1prelim-05-031.fig8a.eps,width=1\textwidth}
\epsfig{figure=H1prelim-05-031.fig8b.eps,width=1\textwidth}
\caption{Upper limits on the cross section 
$\sigma_{U.L.}(ep \rightarrow e \theta^+ X \rightarrow e K^0 p(\bar p) X)$
at 95\% confidence level for $20 < Q^2 <100 GeV^2$ 
and the low momentum $dE/dx$ selection for $K^0_s p$ (top) and
$K^0_S \bar p$ (bottom).
\label{limits3}}
\end{figure}


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