Abstract
In this work, we carry out the study of heavy flavor pentatuarks with four heavy quarks, which have typical $QQQQ\bar q$ configuration. Within the Chromomagnetic Interaction model, the mass spectrum of these discussed $QQQQ\bar q$ pentaquarks is given. In addition to the mass spectrum analysis, we also illustrate their two-body strong decay behavior by estimating some ratios of decay channels. By these effort, we suggest that future experiment should pay attention to this kind of pentaquark.
Highlights
On March 3, 2021, LHC announced that 59 new hadrons were reported over the past decade [1]
We systematically present the mass spectrum of the S-wave QQQQqsystem within the framework of chromomagnetic interaction (CMI) model [44], which has been widely adopted to study the mass spectra of multiquark systems [41,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62]
The observation of the Pcð4312Þ, Pcð4440Þ, and Pcð4457Þ states achieved by the LHCb Collaboration and the study of the possible stable QQqqtetraquark states give us strong confidence to study the mass spectra of the QQQQqpentaquark system within the framework of CMI model
Summary
On March 3, 2021, LHC announced that 59 new hadrons were reported over the past decade [1]. The present situation of hadronic states is far beyond what GellMann and Zweig thought possible [2,3,4] Among these observed states, these Pc states existing in the Λb → J=ψK−p decay are good candidates of exotic molecular pentaquark [5,6,7,8,9,10,11,12,13,14,15]. Some high precision experiments such as BES [28], BABAR [29], Belle [30], and CDF [31] did not confirm the existence of Θþð1540Þ Facing this situation, one realized again that our understanding of nonperturbative behavior of quantum chromodynamics is still absent, which is a lesson of Θþð1540Þ.
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