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Experimental Constraints on the Spin and Parity of the Lambda_c(2880)

High Energy Physics - Experiment 2019-08-14 v2
Authors: R. Mizuk
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Abstract

We report the results of several studies of the Lambda_c+pi+pi-X final state in continuum e+e- annihilation data collected by the Belle detector. An analysis of angular distributions in Lambda_c(2880)->Sigma_c(2455)pi decays strongly favors a Lambda_c(2880) spin assignment of 5/2 over 3/2 or 1/2. We find evidence for Lambda_c(2880)->Sigma_c(2520)pi decay and measure the ratio of Lambda_c(2880) partial widths Gamma[Sigma_c(2520)pi]/Gamma[Sigma_c(2455)pi]=0.225+-0.062+-0.025. This value favors the Lambda_c(2880) spin-parity assignment of 5/2+ over 5/2-. We also report the first observation of Lambda_c(2940)->Sigma_c(2455)pi decay and measure Lambda_c(2880) and Lambda_c(2940) parameters. These studies are based on a 553/fb data sample collected at or near the Upsilon(4S) resonance, at the KEKB collider.

Keywords

Lambda_c(2880) spin parity Sigma_c Belle partial widths

Cite

@article{arxiv.hep-ex/0608043,
  title  = {Experimental Constraints on the Spin and Parity of the Lambda_c(2880)},
  author = {R. Mizuk},
  journal= {arXiv preprint arXiv:hep-ex/0608043},
  year   = {2019}
}

Comments

6 pages, 3 figures; submitted to PRL

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