Understanding the newly observed heavy pentaquark candidates
By Xiao-Hai Liu, Qian Wang, Qiang Zhao. 2015
232 citations recorded by the source corpus.
Abstract We find that several thresholds can contribute to the enhancements of the newly observed heavy pentaquark candidates P c + ( 4380 ) and P c + ( 4450 ) via the anomalous triangle singularity (ATS) transitions in the specific kinematics of Λ b → J / ψ K − p . Apart from the observed two peaks we find that another peaks around 4.5 GeV can also be produced by the ATS. We also show that the Σ c ( ⁎ ) can be produced at leading order in Λ b decay. This process is different from the triangle diagram and its threshold enhancement only appears as CUSP effects if there is no pole structure or the ATS involved. The threshold interaction associated with the presence of the ATS turns out to be a general phenomenon and plays a crucial role in the understanding of candidates for exotic states.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/3bc1906907380aa039c52c01a44ced7a6fafdf9a
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In Nuclear and High Energy Physics
- T. Skwarnicki
- S. Stone
- J. Rosner
- M. Karliner
- Vladimir Vava Gligorov
- Jure Zupan
- Ediotors A. Cerri
- S. Malvezzi
Citations in the corpus
- Exotic Hadrons from Heavy Ion Collisions (2017, background): “It was even suggested that the observed structures could be due to kinematical triangle singularities [210, 211, 212].”
- Hadronic molecules (2017, methodology): “It provides a natural explanation for the newly observed a1(1420) by the COMPASS Collaboration (Adolph et al., 2015) in π−p → π−π−π+p and π−π0π0p (Liu et al., 2016a; Mikhasenko et al., 2015).”
- Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in $\Lambda_b^0 \to J/\psi K^- p$ Decays (2015, background): “[88] employ a variety of rescatterings which result in two-point or triangle singularities.”
- Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “One complexity in interpreting the experimental observation comes from triangle singularities, which are indeed present in this mass region [657, 658].”
- Multiquark States (2017, background): “via the so-called triangle anomaly, must happen in an S-wave to be pronounced, thus cannot account for spin 5/2 either [171, 172, 43].”