Abstract
We utilize a novel method for the partial-wave unitarity recently suggested in [1] to analyse the hypergeometric Coon amplitude. In this approach we use a new type of harmonic numbers as a basis. Owing to the properties of the harmonic numbers this method bypasses lots of difficulties and can be used to derive a clear and unified form for the partial-wave coefficients. This new approach further streamlines the partial-wave unitarity analysis. As an instance, we re-derive the unitarity bounds from Regge trajectory analysis and find the new critical condition of the hypergeometric Coon amplitude. Our new method also benefits the discussion on the various limits of this amplitude. Specifically, we demonstrate the manifest positivity of super string below d ≤ 10 from our new perspective.
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Acknowledgments
BW would like to thank Zhongjie Huang, Konstantinos C. Rigatos and Ellis Ye Yuan for helpful discussions. BW is also grateful to Konstantinos C. Rigatos and Ellis Ye Yuan for the detailed comments on the draft. The work of BW is supported by National Science Foundation of China under Grant No. 12175197, Grant No. 11935013 and Grand No. 12347103. BW is also supported by the Fundamental Research Funds for the Chinese Central Universities under Grant No. 226-2022-00216.
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Wang, B. Positivity of the hypergeometric Coon amplitude. J. High Energ. Phys. 2024, 143 (2024). https://doi.org/10.1007/JHEP04(2024)143
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DOI: https://doi.org/10.1007/JHEP04(2024)143