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We present measurements of branching fractions of $B^0$ decays to multi-bodyfinal states containing protons, based on 232 million $\Upsilon(4S)\toB\bar{B}$ decays collected with the BaBar detector at the SLAC PEP-IIasymmetric-energy $B$ factory. We measure the branching fractions ${\cal B}(B^0\to \bar{D}^0\proton\antiproton)=(1.13\pm0.06\pm0.08)\times 10^{-4}$, ${\calB}(B^0 \to \bar{D}^{*0}\proton\antiproton)=(1.01\pm0.10\pm0.09)\times 10^{-4}$,${\cal B}(B^0 \to D^{-}\proton\antiproton\pi^+)=(3.38\pm0.14\pm0.29)\times10^{-4}$, and ${\cal B}(B^0 \toD^{*-}\proton\antiproton\pi^+)=(4.81\pm0.22\pm0.44)\times 10^{-4}$ where thefirst error is statistical and the second systematic. We present a search forthe charmed pentaquark state, $\Theta_c(3100)$ observed by H1 and put limits onthe branching fraction ${\cal B} (B^0 \to \Theta_c \antiproton\pi^+)\times{\calB}(\Theta_c \to D^{*-}\proton)<14\times10^{-6}$ and ${\cal B}(B^0 \to \Theta_c\antiproton\pi^+)\times{\cal B}(\Theta_c\to D^-\proton)<9\times10^{-6}$. Uponinvestigation of the decay structure of the above four $B^{0}$ decay modes, wesee an enhancement at low $p\bar{p}$ mass and deviations from phase-space inthe $\bar{D}\bar{p}$ and $\bar{D}p$ invariant mass spectra.Comment: 9 pages, 26 postscript figures, submitted to PRD-R

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Measurements of the decays<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mover accent="true"><mml:mi>D</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn…

Measurements of the decaysB0→D¯0pp¯,B