摘要
We study the hadronic decays of ∧c^+ to the final states ∑^+η and ∑^+η, using an e^+e^- annihilation data sample of 567 pb^-1 taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCII collider. We find evidence for the decays ∧^+→∑^+η and ∑^+η' and with statistical significance of and , respectively. Normalizing to the reference decays ∧^+→∑^+π^0 and ∑^+ω, we obtain the ratios of the branching fractions B(∧C^+→∑^+η)/V(∧^→∑^+π^0)and B(∧C^+→∑^+η)/B(∧C^+→∑^+ω)to be and , respectively. The upper limits at the 90% confidence level are set to be B(∧C^→∑^+η)/V(∧^+→∑^+π^0)<0.58 and B(∧C^+→∑^+η)/B(∧C^+→∑^+ω)<1.2. Using BESIII measurements of the branching fractions of the reference decays, we determine B(∧C^+→∑^+η)=(0.41±019±0.05)%(<0.68%) and B(∧C^+→∑^+η)=(1.34+0.53+0.19)%(<1.9%). Here, the first uncertainties are statistical and the second systematic. The obtained branching fraction of ∧C^+→∑^+η is consistent with the previous measurement, and the branching fraction of ∧C^+→∑^+η is measured for the first time.
We study the hadronic decays of ∧c+ to the final states ∑+η and ∑+η’,using an e+e-annihilation data sample of 567 pb-1 taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCⅡ collider.We find evidence for the decays ∧c+→∑+η and ∑+η’ with statistical significance of 2.5σ and 3.2σ,respectively.Normalizing to the reference decays ∧c+→∑+π0 and ∑+ω,we obtain the ratios of the branching fractions■and ■to be 0.35±0.16±0.02 and 0.86±0.34±0.04,respectively.The upper limits at the 90% confidence level are set to be■and■.Using BESIII measurements of the branching fractions of the reference decays,we determine B（∧c+→∑+η）=（0.41±0.19±0.05）%（<0.68%）and B（∧c+→∑+η’）=（1.34±0.53 ±0.19）%（<1.9%）.Here,the first uncertainties are statistical and the second systematic.The obtained branching fraction of ∧c+→∑+η is consistent with the previous measurement,and the branching fraction of ∧c+→∑+η’ is measured for the first time.
基金
Supported in part by National Key Basic Research Program of China(2015CB856700)
National Natural Science Foundation of China(NSFC)(11235011,11275266,11335008,11425524,11625523,11635010)
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(U1332201,U1532257,U1532258)
CAS(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(Collaborative Research Center CRC 1044,FOR 2359)
Istituto Nazionale di Fisica Nucleare,Italy
Koninklijke Nederlandse Akademie van Wetenschappen(KNAW)(530-4CDP03)
Ministry of Development of Turkey(DPT2006K-120470)
National Science and Technology fund
The Swedish Research Council
U.S. Department of Energy under(DE-FG02-05ER41374,DE-SC-0010118,DE-SC-0010504,DE-SC-0012069)
University of Groningen(RuG)
the Helmholtzzentrum fuer Schwerionenforschung GmbH(GSI),Darmstadt
WCU Program of National Research Foundation of Korea(R32-2008-000-10155-0)
