We report the first observation of the decay Λc +→Σ−π+π+π0, based on data obtained in e+e− annihilations with an integrated luminosity of 567 pb−1 at s=4.6 GeV. The data were collected with the BESIII detector at the BEPCII storage rings. The absolute branching fraction B(Λc +→Σ−π+π+π0) is determined to be (2.11±0.33(stat.)±0.14(syst.))%. In addition, an improved measurement of B(Λ+ c→Σ−π+π+) is determined as (1.81±0.17(stat.)±0.09(syst.))%.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Sep 10 2017|
Bibliographical noteFunding Information:
The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. This work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700 ; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11125525 , 11235011 , 11275266 , 11305180 , 11322544 , 11322544 , 11335008 , 11425524 , 11505010 ; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U1332201 , U1532257 , U1532258 ; CAS under Contracts Nos. KJCX2-YW-N29 , KJCX2-YW-N45 , QYZDJ-SSW-SLH003 ; 100 Talents Program of CAS ; National 1000 Talents Program of China ; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology ; German Research Foundation DFG under Contracts Nos. Collaborative Research Center CRC 1044 , FOR 2359 ; Istituto Nazionale di Fisica Nucleare , Italy; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No. 530-4CDP03 ; Ministry of Development of Turkey under Contract No. DPT2006K-120470 ; National Science and Technology fund ; The Swedish Research Council ; U.S. Department of Energy under Contracts Nos. DE-FG02-05ER41374 , DE-SC-0010118 , DE-SC-0010504 , DE-SC-0012069 ; University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0 . This paper is also supported by Beijing municipal government under Contract Nos. KM201610017009 , 2015000020124G064 , CIT&TCD201704047 .
© 2017 The Author(s)
- Branching fraction
- Charmed baryon
- Weak decays
- ee annihilation