Measurement of branching fractions of $\Lambda_{c}^{+} \rightarrow \eta\Lambda\pi^{+}$, $\eta \Sigma^{0} \pi^{+}$, $\Lambda(1670) \pi^{+}$, and $\eta \Sigma(1385)^{+}$ - INSPIRE

DataBETA

Measurement of branching fractions of $\Lambda_{c}^{+} \rightarrow \eta\Lambda\pi^{+}$ , $\eta \Sigma^{0} \pi^{+}$ , $\Lambda(1670) \pi^{+}$ , and $\eta \Sigma(1385)^{+}$

Belle

Collaboration

•

J.Y. Lee
(
- Seoul Natl. U.
)

Aug 26, 2020

12 pages

Published in:

Phys.Rev.D 103 (2021) 5, 052005

Published: Mar 16, 2021

e-Print:

2008.11575 [hep-ex]

DOI:

10.1103/PhysRevD.103.052005

PDG:

{{\mathit \Lambda}{(1670)}}

Experiments:

KEK-BF-BELLE

View in:

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Abstract: (APS)

We report branching fraction measurements of four decay modes of the Λc+ baryon, each of which includes an η meson and a Λ baryon in the final state, and all of which are measured relative to the Λc+→pK-π+ decay mode. The results are based on a 980 fb-1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e- collider. Two decays, Λc+→ηΣ0π+ and Λ(1670)π+, are observed for the first time, while the measurements of the other decay modes, Λc+→ηΛπ+ and ηΣ(1385)+, are more precise than those made previously. We obtain relative branching fractions of B(Λc+→ηΛπ+)/B(Λc+→pK-π+)=0.293±0.003±0.014, B(Λc+→ηΣ0π+)/B(Λc+→pK-π+)=0.120±0.006±0.010, B(Λc+→Λ(1670)π+)×B(Λ(1670)→ηΛ)/B(Λc+→pK-π+)=(5.54±0.29±0.73)×10-2, and B(Λc+→ηΣ(1385)+)/B(Λc+→pK-π+)=0.192±0.006±0.016. The mass and width of the Λ(1670) are also precisely determined to be 1674.3±0.8±4.9 MeV/c2 and 36.1±2.4±4.8 MeV, respectively, where the uncertainties are statistical and systematic, respectively.

Note:

To be submitted to Physical Review D

Particle Physics Experiments
electron positron: annihilation
electron positron: colliding beams
Lambda/c+: hadronic decay
Lambda
eta
Sigma0
Lambda(1670): mass: measured
Lambda(1670): width
mass: width

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