Nakamura, S. X. and Luo, X. (2024) Threshold-cusp explanation for X and Zcs in B+→J/ψϕK+. Il nuovo cimento C, 47 (4). pp. 1-5. ISSN 1826-9885
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Abstract
Several X and Zcs exotic hadrons were claimed in the LHCb’s amplitude analysis on B+ → J/ψφK+. The data shows that all the peaks and also dips in the spectra are located at thresholds of seemingly relevant meson-meson channels. While the LHCb analysis fitted the peaks with Breit-Wigner resonances, threshold kinematical cusps might be the cause of such structures. We thus analyze the LHCb data considering the threshold cusps. Our model is simultaneously fitted to J/ψφ, J/ψK+, and K+φ invariant mass distributions. The threshold cusps fit well all the X, Zcs, and dip structures. Our analysis indicates that spin-parity of the X(4274) and X(4500) structures are 0− and 1−, respectively. This is different from the LHCb’s spin-parity assignments (1+ and 0+). The number of fitting parameters can be significantly reduced by considering the relevant threshold cusps. Our analysis shows that D(∗) s D¯ ∗ scattering lengths are consistent with zero. This disfavors an explanation of Zcs(4000) and Zcs(4220) as D(∗) s D¯ ∗ molecules, which is consistent with lattice QCD via the SU (3) relation.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 11 Sep 2024 15:35 |
| Last Modified: | 11 Sep 2024 15:35 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23142 |
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