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arXiv 1902.04870hep-phhep-ex
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辐射$b$ -重子衰变测量光子和$b$ -重子极化

Radiative $b$-baryon decays to measure the photon and $b$-baryon polarization

Luis Miguel García Martín, Brij Jashal, Fernando Martínez Vidal, Arantza Oyanguren, Shibasis Roy, Ria Sain, Rahul Sinha

摘要:

$b$ -重子的辐射衰变促进了对$b\to sγ$跃迁中光子螺旋度的直接测量,从而成为超越标准模型的重要物理检验。本文在初始极化$b$ -重子样品的假设下,分析了基态$b$ -重子($Λ_{b}^{0}$和$Ξ_{b}^{-}$)辐射衰变到多体末态的全角分布.我们的灵敏度研究表明,光子偏振不对称性可以提取到一个很好的精度,随着初始$b$重子极化的同时测量。随着大型强子对撞机(LHC)后续运行中$b$重子产量的提高,我们发现光子偏振测量可以在约束不同的新物理场景中发挥关键作用。

英文摘要:

The radiative decays of $b$-baryons facilitate the direct measurement of photon helicity in $b\to sγ$ transitions thus serving as an important test of physics beyond the Standard Model. In this paper we analyze the complete angular distribution of ground state $b$-baryon ($Λ_{b}^{0}$ and $Ξ_{b}^{-}$) radiative decays to multibody final states assuming an initially polarized $b$-baryon sample. Our sensitivity study suggests that the photon polarization asymmetry can be extracted to a good accuracy along with a simultaneous measurement of the initial $b$-baryon polarization. With higher yields of $b$-baryons, achievable in subsequent runs of the Large Hadron Collider (LHC), we find that the photon polarization measurement can play a pivotal role in constraining different new physics scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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