Understanding the internal structures of X(4140), X(4274), X(4500) and X(4700)

We investigate the newly observed X (4500) and X (4700) based on the diquark–antidiquark configuration within the framework of QCD sum rules. Both of them may be interpreted as the D -wave c s c ¯ s ¯ tetraquark states of J P = 0 + , but with opposite color structures, which is remarkably similar to...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2017-03, Vol.77 (3), p.1-7, Article 160
Main Authors: Chen, Hua-Xing, Cui, Er-Liang, Chen, Wei, Liu, Xiang, Zhu, Shi-Lin
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Color
Elementary Particles
Hadrons
Heavy Ions
Mass distribution
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
Sum rules
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Summary:We investigate the newly observed X (4500) and X (4700) based on the diquark–antidiquark configuration within the framework of QCD sum rules. Both of them may be interpreted as the D -wave c s c ¯ s ¯ tetraquark states of J P = 0 + , but with opposite color structures, which is remarkably similar to the result obtained in Chen and Zhu (Phys Rev D 83:034010, 2011 ) that X (4140) and X (4274) can be both interpreted as the S -wave c s c ¯ s ¯ tetraquark states of J P = 1 + , also with opposite color structures. However, the extracted masses and these suggested assignments to these X states do depend on these running quark masses where m s ( 2 GeV ) = 95 ± 5  MeV and m c ( m c ) = 1.23 ± 0.09  GeV. As a byproduct, the masses of the hidden-bottom partner states of X (4500) and X (4700) are extracted to be both around 10.64 GeV, which can be searched for in the Υ ϕ invariant mass distribution.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-017-4737-5