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The first direct measurement on the Λc+ decays at the threshold

2016-03-18
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Report in CERN Courier

 

image001

 

The charmed baryon Λc+ was first observed in 1979 by the Mark II experiment. Its decays to hadrons proceed only through the weak interaction. Hence, the Λc+ decay branching fractions are key probes to understand the weak interactions inside a baryon. Especially precise measurement of the Λc+ decays will provide important information on the final state strong interaction in the charm sector, thereby improving our understanding of Quantum Chromodynamics in the non-perturbative energy region. In addition, most excited Λc- and Σc-type baryons and b-flavored baryons eventually decay into a Λc+, and studies of these baryons are directly connected to understanding the ground state Λc+.

However, measurements of the ground state Λc+ were mostly performed by experiments more than 20 years ago. Most decay rates of the Λc+ are measured relative to the decay mode Λc+→pK-π+. There are no completely model-independent measurements of the absolute branching fraction for this decay mo

 

     image002image003

 

The charmed baryon Λc+ was first observed in 1979 by the Mark II experiment. Its decays to hadrons proceed only through the weak interaction. Hence, the Λc+ decay branching fractions are key probes to understand the weak interactions inside a baryon. Especially precise measurement of the Λc+ decays will provide important information on the final state strong interaction in the charm sector, thereby improving our understanding of Quantum Chromodynamics in the non-perturbative energy region. In addition, most excited Λc- and Σc-type baryons and b-flavored baryons eventually decay into a Λc+, and studies of these baryons are directly connected to understanding the ground state Λc+.

However, measurements of the ground state Λc+ were mostly performed by experiments more than 20 years ago. Most decay rates of the Λc+ are measured relative to the decay mode Λc+→pK-π+. There are no completely model-independent measurements of the absolute branching fraction for this decay mo

 

Further reading

BESIII collaboration 2016, Phys. Rev. Lett. 116, 052001

BESIII collaboration 2015, Phys. Rev. Lett. 115, 221805