M. Ablikim, M. Achasov, P. Adlarson, S. Ahmed, M. Albrecht, R. Aliberti, A. Amoroso, M. An, Q. An, X. Bai, Y. Bai, O. Bakina, R. Ferroli, I. Balossino, Y. Ban, K. Begzsuren, N. Berger, M. Bertani, D. Bettoni, F. Bianchi, J. Bloms, A. Bortone, I. Boyko, R. Briere, H. Cai, X. Cai, A. Calcaterra, G. Cao, N. Cao, S. Çetin, J. F. Chang, W. Chang, G. Chelkov, D. Y. Chen, G. Chen, H. S. Chen, M. L. Chen, S. J. Chen, X. R. Chen, Y. B. Chen, Z. J. Chen, W. Cheng, G. Cibinetto, F. Cossio, X. Cui, H. Dai, X. Dai, A. Dbeyssi, R. de Boer, D. Dedovich, Z. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, Y. Ding, C. Dong, J. Dong, L. Dong, M. Dong, X. Dong, S. Du, Y. L. Fan, J. Fang, S. Fang, Y. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Feng, J. H. Feng, M. Fritsch, C. Fu, Y. Gao, Y. G. Gao, I. Garzia, P. Ge, C. Geng, E. Gersabeck, A. Gilman, K. Goetzen, L. Gong, W. Gong, W. Gradl, M. Greco, L. Gu, M. Gu, S. Gu, Y. Gu, C. Guan, A. Guo, L. B. Guo, R. Guo, Y. P. Guo, A. Guskov, T. Han, W. Han, X. Ha
{"title":"通过反应测定$\\Lambda_c^+$自旋 $e^+e^-\\to\\Lambda_c^+\\bar\\Lambda_c^-$","authors":"M. Ablikim, M. Achasov, P. Adlarson, S. Ahmed, M. Albrecht, R. Aliberti, A. Amoroso, M. An, Q. An, X. Bai, Y. Bai, O. Bakina, R. Ferroli, I. Balossino, Y. Ban, K. Begzsuren, N. Berger, M. Bertani, D. Bettoni, F. Bianchi, J. Bloms, A. Bortone, I. Boyko, R. Briere, H. Cai, X. Cai, A. Calcaterra, G. Cao, N. Cao, S. Çetin, J. F. Chang, W. Chang, G. Chelkov, D. Y. Chen, G. Chen, H. S. Chen, M. L. Chen, S. J. Chen, X. R. Chen, Y. B. Chen, Z. J. Chen, W. Cheng, G. Cibinetto, F. Cossio, X. Cui, H. Dai, X. Dai, A. Dbeyssi, R. de Boer, D. Dedovich, Z. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, Y. Ding, C. Dong, J. Dong, L. Dong, M. Dong, X. Dong, S. Du, Y. L. Fan, J. Fang, S. Fang, Y. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Feng, J. H. Feng, M. Fritsch, C. Fu, Y. Gao, Y. G. Gao, I. Garzia, P. Ge, C. Geng, E. Gersabeck, A. Gilman, K. Goetzen, L. Gong, W. Gong, W. Gradl, M. Greco, L. Gu, M. Gu, S. Gu, Y. Gu, C. Guan, A. Guo, L. B. Guo, R. Guo, Y. P. Guo, A. Guskov, T. Han, W. Han, X. Ha","doi":"10.1103/PhysRevD.103.L091101","DOIUrl":null,"url":null,"abstract":"We report on a comparison of two possible $\\Lambda_c^+$ spin hypotheses, $J=\\frac{1}{2}$ and $\\frac{3}{2}$, via the process $e^+e^-\\to\\Lambda_c^+\\bar\\Lambda_c^-$, using the angular distributions of $\\Lambda_c^+$ decays into $pK_S^0$, $\\Lambda\\pi^+$, $\\Sigma^0\\pi^+$, and $\\Sigma^+\\pi^0$. The data were recorded at $\\sqrt s = 4.6$ GeV with the BESIII detector and correspond to an integrated luminosity of 587 pb$^{-1}$. The $\\Lambda_c^+$ spin is determined to be $J=\\frac{1}{2}$, with this value favored over the $\\frac{3}{2}$ hypothesis with a significance of $7.98$ standard deviations ($\\sigma$) with a boundary $(7.89\\sim8.84)\\sigma$, corresponding to the observed range of systematic variations.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":"22 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Determination of the $\\\\Lambda_c^+$ spin via the reaction $e^+e^-\\\\to\\\\Lambda_c^+\\\\bar\\\\Lambda_c^-$\",\"authors\":\"M. Ablikim, M. Achasov, P. Adlarson, S. Ahmed, M. Albrecht, R. Aliberti, A. Amoroso, M. An, Q. An, X. Bai, Y. Bai, O. Bakina, R. Ferroli, I. Balossino, Y. Ban, K. Begzsuren, N. Berger, M. Bertani, D. Bettoni, F. Bianchi, J. Bloms, A. Bortone, I. Boyko, R. Briere, H. Cai, X. Cai, A. Calcaterra, G. Cao, N. Cao, S. Çetin, J. F. Chang, W. Chang, G. Chelkov, D. Y. Chen, G. Chen, H. S. Chen, M. L. Chen, S. J. Chen, X. R. Chen, Y. B. Chen, Z. J. Chen, W. Cheng, G. Cibinetto, F. Cossio, X. Cui, H. Dai, X. Dai, A. Dbeyssi, R. de Boer, D. Dedovich, Z. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, Y. Ding, C. Dong, J. Dong, L. Dong, M. Dong, X. Dong, S. Du, Y. L. Fan, J. Fang, S. Fang, Y. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Feng, J. H. Feng, M. Fritsch, C. Fu, Y. Gao, Y. G. Gao, I. Garzia, P. Ge, C. Geng, E. Gersabeck, A. Gilman, K. Goetzen, L. Gong, W. Gong, W. Gradl, M. Greco, L. Gu, M. Gu, S. Gu, Y. Gu, C. Guan, A. Guo, L. B. Guo, R. Guo, Y. P. Guo, A. Guskov, T. Han, W. Han, X. Ha\",\"doi\":\"10.1103/PhysRevD.103.L091101\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report on a comparison of two possible $\\\\Lambda_c^+$ spin hypotheses, $J=\\\\frac{1}{2}$ and $\\\\frac{3}{2}$, via the process $e^+e^-\\\\to\\\\Lambda_c^+\\\\bar\\\\Lambda_c^-$, using the angular distributions of $\\\\Lambda_c^+$ decays into $pK_S^0$, $\\\\Lambda\\\\pi^+$, $\\\\Sigma^0\\\\pi^+$, and $\\\\Sigma^+\\\\pi^0$. The data were recorded at $\\\\sqrt s = 4.6$ GeV with the BESIII detector and correspond to an integrated luminosity of 587 pb$^{-1}$. 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引用次数: 3
摘要
通过$e^+e^-\to\Lambda_c^+\bar\Lambda_c^-$的过程，利用$\Lambda_c^+$衰变为$pK_S^0$、$\Lambda\pi^+$、$\Sigma^0\pi^+$和$\Sigma^+\pi^0$的角分布，对$J=\frac{1}{2}$和$\frac{3}{2}$两种可能的自旋假设$\Lambda_c^+$进行比较。用BESIII探测器在$\sqrt s = 4.6$ GeV记录数据，对应的综合光度为587 pb $^{-1}$。确定$\Lambda_c^+$自旋为$J=\frac{1}{2}$，该值优于$\frac{3}{2}$假设，其显著性为$7.98$标准差($\sigma$)，边界为$(7.89\sim8.84)\sigma$，与观察到的系统变化范围相对应。
Determination of the $\Lambda_c^+$ spin via the reaction $e^+e^-\to\Lambda_c^+\bar\Lambda_c^-$
We report on a comparison of two possible $\Lambda_c^+$ spin hypotheses, $J=\frac{1}{2}$ and $\frac{3}{2}$, via the process $e^+e^-\to\Lambda_c^+\bar\Lambda_c^-$, using the angular distributions of $\Lambda_c^+$ decays into $pK_S^0$, $\Lambda\pi^+$, $\Sigma^0\pi^+$, and $\Sigma^+\pi^0$. The data were recorded at $\sqrt s = 4.6$ GeV with the BESIII detector and correspond to an integrated luminosity of 587 pb$^{-1}$. The $\Lambda_c^+$ spin is determined to be $J=\frac{1}{2}$, with this value favored over the $\frac{3}{2}$ hypothesis with a significance of $7.98$ standard deviations ($\sigma$) with a boundary $(7.89\sim8.84)\sigma$, corresponding to the observed range of systematic variations.
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