Calculation of doubly heavy baryons decay

IF 0.2 Q4 PHYSICS, MULTIDISCIPLINARY Recent Contributions to Physics Pub Date : 2021-09-01 DOI:10.26577/rcph.2021.v78.i3.01
Z. Tyulemissov, A. Issadykov, A. Bekbaev, D. Aznabaev, K. Nurlan
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Abstract

We calculated a subclass of four nonleptonic two-body weak decays of the double charm baryon ground states Ξcc++. Nonleptonic decays can be dividedinto two group: factorizable and nonfactorizable decays. The first one can be easily calculated from first principles. Therefore, its good example understands all pros and cons of a model. We focused on a weak two-body nonleptonic decay consists only fromthe factorizing contribution precluding a contamination from W-exchange. We use the covariant confined quark model previously developed by us to calculate the various helicity amplitudes which describe the dynamics of the transition induced by the Cabibbo-favored effective currents. Achievement of CCQM is that only size parameter Λvarying can describe all tree diagrams of nonleptonic decay. We then proceed to calculate the rates of the decay. The rates, branching ratios and helicity amplitude were calculated using dimensionless invariant form factors. Also, we calculated leptonic constant for scalar and vector mesons which has good agreement with experimental data. There isn’t any experimental data about the decay so we waiting for new experimental observation in the heavy baryon sector.
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双重子衰变的计算
我们计算了双魅力重子基态的四个非轻子二体弱衰变的一个子类。非轻子衰变可分为两组:可因子分解衰变和非因子分解衰变。第一个可以很容易地根据第一性原理进行计算。因此,它的好例子理解了模型的所有优点和缺点。我们关注的是一个弱的两体非轻子衰变,它只由排除W交换污染的因子贡献组成。我们使用我们以前开发的协变受限夸克模型来计算各种螺旋度振幅,这些振幅描述了由Cabibbo有利有效电流引起的跃迁的动力学。CCQM的成就是,只有尺寸参数∧变化才能描述所有非轻子衰变的树状图。然后我们继续计算衰变率。使用无量纲不变形式因子计算速率、分支比和螺旋度幅度。此外,我们还计算了标量介子和矢量介子的轻子常数,这与实验数据有很好的一致性。目前还没有任何关于衰变的实验数据,所以我们正在等待重重子区的新实验观测。
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