Searches for $\Lambda^0_{b}$ and $\Xi^{0}_{b}$ decays to $K^0_{\rm S} p \pi^{-}$ and $K^0_{\rm S}p K^{-}$ final states with first observation of the $\Lambda^0_{b} \rightarrow K^0_{\rm S}p \pi^{-}$ decay - INSPIRE

DataBETA

Searches for $\Lambda^0_{b}$ and $\Xi^{0}_{b}$ decays to $K^0_{\rm S} p \pi^{-}$ and $K^0_{\rm S}p K^{-}$ final states with first observation of the $\Lambda^0_{b} \rightarrow K^0_{\rm S}p \pi^{-}$ decay

LHCb

Collaboration

Feb 4, 2014

24 pages

Published in:

JHEP 04 (2014) 087

Published: 2014

e-Print:

1402.0770 [hep-ex]

DOI:

10.1007/JHEP04(2014)087

PDG:

{{\mathit \Lambda}_{{{b}}}^{0}}

\rightarrow

{{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit \pi}^{-}}

Report number:

LHCB-PAPER-2013-061,
CERN-PH-EP-2014-012

Experiments:

CERN-LHC-LHCb

View in:

reference search66 citations

Citations per year

Abstract: (arXiv)

A search for previously unobserved decays of beauty baryons to the final states

K^0_{\rm\scriptscriptstyle S} p \pi^{-}

and

K^0_{\rm\scriptscriptstyle S}p K^{-}

is reported. The analysis is based on a data sample corresponding to an integrated luminosity of

1.0\,

fb

^{-1}

of

pp

collisions. The

\Lambda^0_{b} \rightarrow \overline{\kern -0.2em K}^0_{\rm\scriptscriptstyle S}p \pi^{-}

decay is observed with a significance of

8.6\,\sigma

, with branching fraction \begin{eqnarray*} {\cal{B}}(\Lambda^0_{b} \rightarrow \overline{\kern -0.2em K}^0 p \pi^{-}) & = & \left(1.26 \pm 0.19 \pm 0.09 \pm 0.34 \pm 0.05 \right) \times 10^{-5} \,, \end{eqnarray*} where the uncertainties are statistical, systematic, from the ratio of fragmentation fractions

f_{\Lambda}/f_{d}

, and from the branching fraction of the

B^0 \rightarrow K^0_{\rm\scriptscriptstyle S}\pi^{+}\pi^{-}

normalisation channel, respectively. A first measurement is made of the

CP

asymmetry, giving \begin{eqnarray*} A_{C/!P} (\Lambda^0_{b} \rightarrow \overline{\kern -0.2em K}^0 p \pi^{-}) & = & 0.22 \pm 0.13\mathrm{\,(stat)} \pm 0.03\mathrm{\,(syst)} \, . \end{eqnarray*} No significant signals are seen for

\Lambda^0_{b} \rightarrow K^0_{\rm\scriptscriptstyle S}p K^{-}

decays,

\Xi^{0}_{b}

decays to both the

K^0_{\rm\scriptscriptstyle S}p \pi^{-}

and

K^0_{\rm\scriptscriptstyle S}p K^{-}

final states, and the

\Lambda^0_{b} \rightarrow D^{-}_{s} (\rightarrow K^0_{\rm\scriptscriptstyle S} K^{-}) p

decay, and upper limits on their branching fractions are reported.

Note:

27 pages, 4 figures

Hadron-Hadron Scattering
Branching fraction
B physics
Flavor physics
p p: scattering
Lambda/b0: hadronic decay
Lambda/b0: branching ratio: measured
Xi/b0: hadronic decay
branching ratio: upper limit
final state: (0charm)

References(38)

Figures(0)

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