Measurement of $\sigma ({\Lambda }_b)/\sigma (B^0)\times BR({\Lambda }_b\to {\Lambda }_c{\pi }^{-})/BR(B^0\to D^{+}{\pi }^{-})$ in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV

Abstract

We present the first observation of the baryon decay ${\Lambda }_b\to {\Lambda }_c{\pi }^{-}$ followed by ${\Lambda }_c\to p{K}^{-}{\pi }^{+}$ in 106 pb-1 of $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV in the CDF experiment. In order to reduce systematic error, the measured rate for ${\Lambda }_b$ decay is normalized to the kinematically similar meson decay $B^0\to D^{+}{\pi }^{-}$ followed by $D^{+}\to {\pi }^{+}{K}^{-}{\pi }^{+}$. We report the ratio of production cross sections ($\sigma$) times the ratio of branching fractions (BR) for the momentum region integrated above $p_T>6$ GeV/c and pseudorapidity range $|\eta |<1.3$: $\sigma (p\bar{p}\to {\Lambda }_{b}X)/\sigma (p\bar{p}\to B^{0}X)\times BR({\Lambda }_b\to {\Lambda }_c{\pi }^{-})/BR(B^0\to D^{+}{\pi }^{-})=0.82\pm 0.08(stat)\pm 0.11(syst)\pm 0.22(BR({\Lambda }_c\to p{K}^{-}{\pi }^{+}))$.

Submitted to Phys.Rev.Lett

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