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Dipion decays of heavy baryons

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Chinese Physics C 2014年第11期38卷 1-15页

作者：牟春王霄陈晓林刘翔朱世林 Department of Physics and State Key Laboratory of Nuclear Physics and Technology and Center of High Energy Physics Peking University Research Center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of Chinese Academy of Sciences School of Physical Science and Technology Lanzhou University Collaborative Innovation Center of Quantum Matter

Compared with the charmed baryons, the bottom baryons are not very well known, either experimentally Or theoretically. In this paper, we investigate the dipion strong decays of the P-wave and D-wave excited bottom bar... 详细信息

关键词： bottom baryon charmed baryon dipion decay the quark pair creation model

Λ_c~* in a coupled-channel baryon-meson scattering

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Chinese Physics C 2011年第1期35卷 16-21页

作者：梁伟红邱玉凤胡建雄沈彭年 Department of physics Guangxi Normal University Theoretical Physics Center for Science Facilities (TPCSF) Chinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Sciences

Possible structures and properties of some excited states of ∧^＋c dynamically generated in the coupled-channel P-wave meson-baryon scattering are studied by solving the Bethe-Salpeter（BS） equation in the framework of the Chiral Unitary Approach. It is shown that both ∧^＋c（2765） and ∧^＋c（2940） could be generated dynamically and could be compound states with multi-configuration molecular-like structures. The couplings of the generated states to various reaction channels are also calculated. Moreover, two highly excited states, ∧^＋c（3024） and ∧^＋c（3134）, are predicted.

关键词： charmed baryon multi-channel scattering chiral unitary approach

Weak decays ofΞ^((′))_(c)→Ξin the light-front quark model

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Chinese Physics C 2021年第11期45卷 34-44页

作者： Hong-Wei Ke Qing-Qing Kang Xiao-Hai Liu Xue-Qian Li School of Science Tianjin UniversityTianjin 300072China School of Physics Nankai UniversityTianjin 300071China

Without contamination from the final state interactions,the calculation of the branching ratios of semileptonic decays Ξ^((′))_(c)→Ξ+e^(+)ν_(e) may provide further information about the inner structure of charmed ***,by studying such processes,one can better determine the form factors of Ξ_(c)→Ξ that can be further applied to relevant *** this study,we used the light-front quark model to carry out computations where the three-body vertex functions forΞ_(c) and Ξ are *** fit the new data of the Belle II,we re-adjusted the model parameters to obtain β_(s[sq])=1.07 GeV,which is 2.9 times larger than β_(ss)=0.366 *** value may imply that the ss pair in Ξ constitutes a more compact ***,we investigated the non-leptonic decays of Ξ^((′))_(c)→Ξ,which will be experimentally measured ***,our model will be tested in terms of consistency with the new data.

关键词： charmed baryon weak decay relativistic quark model

Λ_(c)^(+)→Λh^(+)和Λc+→∑^(0)h^(+)(h=K,π)衰变道CP破坏的寻找和其分支比与衰变不对称参数的测量

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Science Bulletin 2023年第6期68卷 583-592,M0004页

作者： Belle合作组 L.K.Li Belle合作组

本文报告了粲重子Λ_(c)^(+)的四个弱衰变道Λ_(c)^(+)→Λh^(+)和Λ_(c)^(+)→∑^(0)h^(+)(h=K,π)的系列研究.基于在KEKB能量不对称的正负电子对撞机上的Belle探测器收集的980 fb-1数据样本,作者测量了粲重子两体单卡比玻压低(SCS)衰... 详细信息

本文报告了粲重子Λ_(c)^(+)的四个弱衰变道Λ_(c)^(+)→Λh^(+)和Λ_(c)^(+)→∑^(0)h^(+)(h=K,π)的系列研究.基于在KEKB能量不对称的正负电子对撞机上的Belle探测器收集的980 fb-1数据样本,作者测量了粲重子两体单卡比玻压低(SCS)衰变过程中的直接电荷共轭-宇称(CP)不对称:ACPdir(Λ_(c)^(+)→ΛK^(+))=+0.021±0.026±0.001和ACPdir(Λ_(c)^(+)→∑^(0)K^(+))=+0.025±0.054±0.004;精确测量了衰变不对称参数(α)和其引起的CP不对称度:AC^(α)_(P)(Λ_(c)^(+)→ΛK^(+))=-0.023±0.086±0.071和AC^(α)_(P)(Λ_(c)^(+)→∑^(0)K^(+))=+0.08±0.035±0.14.这是粲重子SCS衰变的第一个AC^(α)_(P)结果;其次,作者在实验上利用粲重子衰变来寻找超子CP破坏,即利用Λ_(c)^(+)→(Λ,∑^(0))π^(+)衰变获得AC^(α)_(P)(Λ→pπ-)=+0.013±0.007±0.011.以上测量均未发现重子CP破坏的证据.此外,该文还报告了Λ_(c)^(+)两个SCS衰变道的分支比测量:B(Λ_(c)^(+)-ΛK^(+))=(6.57±0.17±0.11±0.35)×10^(-4)和B(Λ_(c)^(+)→∑^(0)K^(+))=(3.58±0.19±0.06±0.19)×10^(-4),这些均为目前最精确的结果.

关键词： CP violation charmed baryon Singly Cabibbo-suppressed decay Branching fraction Decay asymmetry parameter CP asymmetry

Measurement of the lifetimes of promptly produced Ω_(c)^(0) and Ξ_(c)^(0) baryons

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Science Bulletin 2022年第5期67卷 479-487,M0003页

作者： LHCb Collaboration LHCb Collaboration

A measurement of the lifetimes of theΩ_(c)^(0)andΞ_(c)^(0)baryons is reported using proton-proton collision data at a centre-of-mass energy of 13 TeV,corresponding to an integrated luminosity of 5.4 fb;collected by the LHCb ***Ω_(c)^(0)andΞ_(c)^(0)baryons are produced directly from proton interactions and reconstructed in the p K^(-)K^(+)π^(+)nal ***Ω_(c)^(0)lifetime is measured to be 276.5±13.4±4.4±0.7 fs,and theΞ_(c)^(0)lifetime is measured to be 148.0±2.3±2.2±0.2 fs,where the first uncertainty is statistical,the second systematic,and the third due to the uncertainty on the D^(0)*** results con firm previous LHCb measurements based on semileptonic beauty-hadron decays,which disagree with earlier results of a four times shorterΩ_(c)^(0)lifetime,and provide the single most precise measurement of theΩ_(c)^(0)lifetime.

关键词： charmed baryon Flavour physics QCD Lifetime Charm physics LHCb