Triangle singularity in the J/ψ→K+K-f0(980)(a0(980)) decays

We study the J / ψ → K + K - f 0 ( 980 ) ( a 0 ( 980 ) ) reaction and find that the mechanism to produce this decay develops a triangle singularity around M inv ( K - f 0 / K - a 0 ) ≈ 1515  MeV. The differential width d Γ / d M inv ( K - f 0 / K - a 0 ) shows a rapid growth around the invariant mas...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2019-05, Vol.79 (5)
Main Authors: Liang, Wei-Hong, Chen, Hua-Xing, Oset, Eulogio, Wang, En
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Elementary Particles
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
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Summary:We study the J / ψ → K + K - f 0 ( 980 ) ( a 0 ( 980 ) ) reaction and find that the mechanism to produce this decay develops a triangle singularity around M inv ( K - f 0 / K - a 0 ) ≈ 1515  MeV. The differential width d Γ / d M inv ( K - f 0 / K - a 0 ) shows a rapid growth around the invariant mass being 1515 MeV as a consequence of the triangle singularity of this mechanism, which is directly tied to the nature of the f 0 ( 980 ) and a 0 ( 980 ) as dynamically generated resonances from the interaction of pseudoscalar mesons. The branching ratios obtained for the J / ψ → K + K - f 0 ( 980 ) ( a 0 ( 980 ) ) decays are of the order of 10 - 5 , accessible in present facilities, and we argue that their observation should provide relevant information concerning the nature of the low-lying scalar mesons.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-019-6928-8