اشترك بالحزمة الذهبية واحصل على وصول غير محدود شمرا أكاديميا
تسجيل مستخدم جديدObservation of chi_{cJ} Decays to Lambda Lambda barpi^{+}pi^{-}
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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.
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o 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.
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^{-6}$, where the first uncertainty is statistical, the second is systematic, and the third is the uncertainty arising from interference with the continuum. This result is significantly smaller than the measurement based on CLEO-c data sets. The decays $chi_{cJ} rightarrowLambdabar{Lambda}$ are measured via $psi(3686)rightarrowgammachi_{cJ}$, and the branching fractions are determined to be $mathcal{B}left(chi_{c0}rightarrowLambdabar{Lambda}right)=(3.64 pm 0.10 pm 0.10 pm 0.07)times 10^{-4}$, $mathcal{B}left(chi_{c1}rightarrowLambdabar{Lambda}right)=(1.31pm0.06 pm 0.06 pm0.03)times 10^{-4}$, $mathcal{B}left(chi_{c2}rightarrowLambdabar{Lambda}right)=(1.91pm0.08 pm 0.17 pm0.04)times 10^{-4}$, where the third uncertainties are systematic due to the $psi(3686) rightarrow gamma chi_{c J}$ branching fractions.
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