Nature of X(3872) from the line shape

2019/12/01 by Kang, Xian-Wei, Oller, J. A.
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.1912.00344

Abstract

Using a general parameterization of two-body scattering amplitude, we systematically analyze the corresponding data on X(3872), more explicitly, the CDF data on inclusive pp scattering to J/ψπ⁺π^-, and the Belle and BaBar data on B decays to K J/ψπ⁺π^- and K DD^*0 around the D⁰D^*0 threshold. We achieve a good reproduction of data and find that the X(3872) can be interpreted as a bound and/or virtual state, or even higher-order (double or triple) virtual sate pole. The latter point was not realized previously in the literature. % The latter point has not been realized in other literatures. As a result, the compositeness of the X(3872) can vary largely from nearly 0 to 1. More higher-precision data is needed to discriminate its pole structure and nature.

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