Measurement of the absolute branching fraction of the three-body decay <math display="inline"><msubsup><mi mathvariant="normal">Λ</mi><mi>c</mi><mo>+</mo></msubsup><mo stretchy="false">→</mo><msup><mi mathvariant="normal">Ξ</mi><mn>0</mn></msup><msup><mi>K</mi><mo>+</mo></msup><msup><mi>π</mi><mn>0</mn></msup></math> and search for <math display="inline"><msubsup><mi mathvariant="normal">Λ</mi><mi>c</mi><mo>+</mo></msubsup><mo stretchy="false">→</mo><mi>n</mi><msup><mi>K</mi><mo>+</mo></msup><msup><mi>π</mi><mn>0</mn></msup></math>, <math display="inline"><msup><mi mathvariant="normal">Σ</mi><mn>0</mn></msup><msup><mi>K</mi><mo>+</mo></msup><msup><mi>π</mi><mn>0</mn></msup></math>, and <math display="inline"><mi mathvariant="normal">Λ</mi><msup><mi>K</mi><mo>+</mo></msup><msup><mi>π</mi><mn>0</mn></msup></math>

collision data at center-of-mass energies between 4.600 and 4.840 GeV, collected with the BESIII detector at the BEPCII collider. With a double-tag method, the branching fraction of the three-body decay

Λ_{c}^{+} \to Ξ^{0} K^{+} π^{0}

is measured to be

(7.79 \pm 1.46 \pm 0.95) \times 10^{- 3}

, where the first and second uncertainties are statistical and systematic, respectively. The branching fraction of the two-body decay

Λ_{c}^{+} \to Ξ (1530)^{0} K^{+}

is

(5.99 \pm 1.04 \pm 0.32) \times 10^{- 3}

, which is consistent with the previous result of

(5.02 \pm 0.99 \pm 0.31) \times 10^{- 3}

. In addition, the upper limit on the branching fraction of the doubly Cabbibo-suppressed decay

Λ_{c}^{+} \to n K^{+} π^{0}

is

7.1 \times 10^{- 4}

at the 90% confidence level. The upper limits on the branching fractions of

Λ_{c}^{+} \to Σ^{0} K^{+} π^{0}

and

Λ K^{+} π^{0}

are also determined to be

1.8 \times 10^{- 3}

and

2.0 \times 10^{- 3}

, respectively.

Note:

15 pages, 20 figures

electron positron: annihilation
electron positron: colliding beams
Lambda/c+: hadronic decay
Lambda/c+: decay modes
Lambda/c+: branching ratio
branching ratio: measured
branching ratio: upper limit
Beijing Stor
Xi
Xi(1530)

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Measurement of the absolute branching fraction of the three-body decay Λc+→Ξ0K+π0 and search for Λc+→nK+π0, Σ0K+π0, and ΛK+π0

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Measurement of the absolute branching fraction of the three-body decay $Λ_{c}^{+} \to Ξ^{0} K^{+} π^{0}$ and search for $Λ_{c}^{+} \to n K^{+} π^{0}$ , $Σ^{0} K^{+} π^{0}$ , and $Λ K^{+} π^{0}$