First observation of doubly Cabibbo-suppressed decay of a charmed baryon; $Lambda_c^{+} rightarrow pK^+pi^-$

Yang, S. B.*; Tanida, Kiyoshi ; Belle Collaboration*; 191 of others*

We report the first observation of the decay $Lambda_c^{+} rightarrow pK^+pi^-$ using a 980 fb $^{-1}$ data sample collected by the Belle detector at the KEKB asymmetric-energy collider. This is the first observation of a doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be ${cal B}(Lambda_c^{+} rightarrow pK^+pi^-)/{cal B}(Lambda_c^{+} rightarrow pK^+pi^+)=(2.35 pm 0.27 pm 0.21)times 10^{-3}$ , where the uncertainties are statistical and systematic, respectively.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	117
Number	:	1
Pages	:	p.011801_1 - 011801_6
Publication Year/Month	:	2016/07
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PDF	:	AA2016-0388.pdf:0.49MB
Paper URL	:	https://doi.org/10.1103/PhysRevLett.117.011801
DOI for research data	:
Keywords	:	ハドロン分光
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Article of JAEA R&D Review	:
Cooperating Institute	:	高エネルギー加速器研究機構

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Registration No. : AA20160388
JAEA Abstracts No. : 45000044
Paper Submission No. : 18380

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