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Register a new userMeasurements of Baryon Pair Decays of $chi_{cJ}$ Mesons
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Xiongfei Wang et al.
Publication date
2012
fields
Physics
and research's language is
English
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Using 106 $times 10^{6}$ $psi^{prime}$ decays collected with the BESIII detector at the BEPCII, three decays of $chi_{cJ}$ ($J=0,1,2$) with baryon pairs ($llb$, $ssb$, $SSB$) in the final state have been studied. The branching fractions are measured to be $cal{B}$$(chi_{c0,1,2}rightarrowLambdabarLambda) =(33.3 pm 2.0 pm 2.6)times 10^{-5}$, $(12.2 pm 1.1 pm 1.1)times 10^{-5}$, $(20.8 pm 1.6 pm 2.3)times 10^{-5}$; $cal{B}$$(chi_{c0,1,2}rightarrowSigma^{0}barSigma^{0})$ = $(47.8 pm 3.4 pm 3.9)times 10^{-5}$, $(3.8 pm 1.0 pm 0.5)times 10^{-5}$, $(4.0 pm 1.1 pm 0.5) times 10^{-5}$; and $cal{B}$$(chi_{c0,1,2}rightarrowSigma^{+}barSigma^{-})$ = $(45.4 pm 4.2 pm 3.0)times 10^{-5}$, $(5.4 pm 1.5 pm 0.5)times 10^{-5}$, $(4.9 pm 1.9 pm 0.7)times 10^{-5}$, where the first error is statistical and the second is systematic. Upper limits on the branching fractions for the decays of $chi_{c1,2}rightarrowSigma^{0}barSigma^{0}$, $Sigma^{+}barSigma^{-}$, are estimated to be $cal{B}$$(chi_{c1}rightarrowSigma^{0}barSigma^{0}) < 6.2times 10^{-5}$, $cal{B}$$(chi_{c2}rightarrowSigma^{0}barSigma^{0}) < 6.5times 10^{-5}$, $cal{B}$$(chi_{c1}rightarrowSigma^{+}barSigma^{-}) < 8.7times 10^{-5}$ and $cal{B}$$(chi_{c2}rightarrowSigma^{+}barSigma^{-}) < 8.8times 10^{-5}$ at the 90% confidence level.
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Decays $chi_{cJ}~(J=0,1,2)toomegaphi$ are studied using $(448.1pm2.9)times 10^{6} ~psi(3686)$ events collected with the BESIII detector in 2009 and 2012. In addition to the previously established $chi_{c0}toomegaphi$, first observation of $chi_{c1} to omega phi$ is reported in this paper. The measured product branching fractions are ${cal{B}}(psi(3686)togammachi_{c0})times{cal{B}}(chi_{c0}toomegaphi)=(13.83pm 0.70pm 1.01)times10^{-6}$ and ${cal{B}}(psi(3686)togammachi_{c1})times{cal{B}}(chi_{c1}toomegaphi)=(2.67pm 0.31pm 0.27)times10^{-6}$, and the absolute branching fractions are ${cal{B}}(chi_{c0}toomegaphi)=(13.84pm 0.70pm 1.08)times10^{-5}$ and ${cal{B}}(chi_{c1}toomegaphi)=(2.80pm 0.32pm 0.30)times10^{-5}$. We also find a strong evidence for $chi_{c2}toomegaphi$ with a statistical significance of 4.8$sigma$, and the corresponding product and absolute branching fractions are measured to be ${cal{B}}(psi(3686)togammachi_{c2})times{cal{B}}(chi_{c2}toomegaphi)=(0.91pm0.23pm0.12)times10^{-6} $ and ${cal{B}}(chi_{c2}toomegaphi)=(1.00pm0.25pm0.14)times10^{-5}$. Here, the first errors are statistical and the second ones systematic.
We measured the branching fractions of the decays $chi_{cJ}toSigma^{-}bar{Sigma}^{+}$ for the first time using the final states $nbar{n}pi^{+}pi^{-}$. The data sample exploited here is $448.1times10^{6}$ $psi(3686)$ events collected with BESIII. We find $mathcal{B}(chi_{cJ}rightarrowSigma^{-}bar{Sigma}^{+}) = (51.3pm2.4pm4.1)times10^{-5},, (5.7pm1.4pm0.6)times10^{-5},, rm{and}~ (4.4pm1.7pm0.5)times10^{-5}$, for $J=0,1,2$, respectively, where the first uncertainties are statistical and the second systematic.
Decays of the chi_{cJ} states (J=0, 1, 2) to Lambda Lambda bar pi^{+} pi^{-}, including processes with intermediate Sigma(1385), are studied through the E1 transition psi-->gamma chi_{cJ} using 106 million psi events collected with the BESIII detector at BEPCII. This is the first observation of chi_{cJ} decays to the final state LambdaLambda bar pi^{+}pi^{-}. The branching ratio of the intermediate process chi_{cJ}-->Sigma(1385)^{+/-} bar{Sigma}(1385)^{-/+} is also measured for the first time, and the results agree with the theoretical predictions based on the color-octet effect.
Using a data sample of $(448.1pm2.9)times10^{6}$ $psi(3686)$ decays collected by the BESIII detector at the Beijing Electron Positron Collider (BEPCII), we observe the decays $chi_{cJ}to phiphieta~(J=0,~1,~2)$, where the $chi_{cJ}$ are produced via the radiative processes $psi(3686)togammachi_{cJ}$. The branching fractions are measured to be $mathcal B(chi_{c0}tophiphieta)=(8.41pm0.74pm0.62)times10^{-4}$, $mathcal B(chi_{c1}tophiphieta)=(2.96pm0.43pm0.22)times 10^{-4}$, and $mathcal B(chi_{c2} to phiphieta)=(5.33pm0.52pm0.39) times 10^{-4}$, where the first uncertainties are statistical and the second are systematic. We also search for intermediate states in the $phiphi$ or $etaphi$ combinations, but no significant structure is seen due to the limited statistics.
Using a sample of 106 million $psi(3686)$ decays, the branching fractions of $psi(3686) to gamma chi_{c0}, psi(3686) to gamma chi_{c1}$, and $psi(3686) to gamma chi_{c2}$ are measured with improved precision to be $(9.389 pm 0.014 pm 0.332),%$, $(9.905 pm 0.011 pm 0.353),% $, and $(9.621 pm 0.013 pm 0.272),% $, respectively, where the first uncertainties are statistical and the second ones are systematic. The product branching fractions of $psi(3686) to gamma chi_{c1}, chi_{c1} to gamma J/psi$ and $psi(3686) to gamma chi_{c2}, chi_{c2} to gamma J/psi$ and the branching fractions of $chi_{c1} to gamma J/psi$ and $chi_{c2} to gamma J/psi$ are also presented.
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