Measurement of the mass difference and relative production rate of the O b - and ? b - baryons
Measurement of the mass difference and relative production rate of the O b - and ? b - baryons
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O b - 和α 的质量差和相对生产率的测量
DOI：
10.1103/physrevd.108.052008
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发表时间：
2023
影响因子：
5
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
利用LHCb实验收集的质子-质子碰撞数据测量了重子和重子之间的质量差，对应于积分光度，并发现m（Ωb-）-m（Ξb-）=248.54±0.51（stat）±0.38(syst) MeV/c2。重子的质量测量为m（Ωb-）=6045.9±0.5（stat）±0.6(syst) MeV/c2。这是迄今为止最精确的质量测定。此外，利用在质心能量为13 TeV，对应于综合光度为的地方收集的LHCb数据，首次测量了碰撞中重子相对于重子的产生率。重建运动区内的美重子，并将其衰变为亚子和超子，得到比值fΩb-fΞb-×B（Ωb-→J/ψΩ-）B（Ξb-→J/ψΞ-）=0.120±0.008（stat）±0.008(syst)，其中分别为夸克分裂为和重子的碎片分数，表示各自衰变的分支分数。
The mass difference between theandbaryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of, and is found to be m(Ωb-)-m(Ξb-)=248.54±0.51(stat)±0.38(syst) MeV/c2. The mass of thebaryon is measured to be m(Ωb-)=6045.9±0.5(stat)±0.6(syst) MeV/c2. This is the most precise determination of themass to date. In addition, the production rate ofbaryons relative to that ofbaryons is measured for the first time incollisions, using an LHCb dataset collected at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of. Reconstructing beauty baryons in the kinematic regionandwith their decays to ameson and a hyperon, the ratio fΩb-fΞb-×B(Ωb-→J/ψΩ-)B(Ξb-→J/ψΞ-)=0.120±0.008(stat)±0.008(syst), is obtained, whereandare the fragmentation fractions ofquarks intoandbaryons, respectively, andrepresents the branching fractions of their respective decays.