Observation of Xi(1620)(0) and Evidence for Xi(1690)(0) in Xi(+)(c) -> Xi(-) pi(+) pi(+) Decays

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Date
2019-02-21
Author
Belle Collaboration
Schnell, Gunar
Van Hulse, Charlotte Barbara
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Physical Review Letters 122(7) : (2019) // Article ID 072501
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http://hdl.handle.net/10810/32824
Abstract
We report the first observation of the double strange baryon Xi(1620)(0) in its decay to Xi(-) pi(+) via Xi(+)(c) -> Xi(-)pi(+)pi(+) decays based on a 980 fb(-1) data sample collected with the Belle detector at the KEKB asymmetricenergy e(+)e(-) collider. The mass and width are measured to be 1610.4 +/- 6.0(stat)(-4.2)(+6.1) (syst) MeV/c(2) and 59.9 +/- 4.8(stat)(-7.1)(+2.8)(syst) MeV, respectively. We obtain 4.0 sigma evidence of the Xi(1690)(0) with the same data sample. These results shed light on the structure of hyperon resonances with strangeness S = -2.
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Attribution 4.0 International (CC BY 4.0)