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Substructure of Multiquark Hadrons (Snowmass 2021 White Paper) / Brambilla, Nora (Munich, Tech. U. ; TUM-IAS, Munich ; MCQST, Munich) ; Chen, Hua-Xing (Southeast U., Nanjing) ; Esposito, Angelo (Princeton, Inst. Advanced Study) ; Ferretti, Jacopo (Jyvaskyla U.) ; Francis, Anthony (Bern U. ; Taiwan, Natl. Chiao Tung U. ; CERN) ; Guo, Feng-Kun (Beijing, Inst. Theor. Phys. ; Beijing, GUCAS) ; Hanhart, Christoph (Julich, Forschungszentrum) ; Hosaka, Atsushi (Osaka U., Res. Ctr. Nucl. Phys.) ; Jaffe, Robert L. (MIT) ; Karliner, Marek (Tel Aviv U.) et al.
In recent years there has been a rapidly growing body of experimental evidence for existence of exotic, multiquark hadrons, i.e. [...]
arXiv:2203.16583. - 47 p.
eConf - Fulltext

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Decoding the nature of the pentaquark states from LHCb / Du, Meng-Lin (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP) ; Baru, Vadim (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP ; Moscow, ITEP ; Lebedev Inst.) ; Guo, Feng-Kun (Beijing, KITPC ; Beijing, GUCAS) ; Hanhart, Christoph (IAS, Julich ; JCHP, Julich) ; Meißner, Ulf-G. (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP ; IAS, Julich ; JCHP, Julich ; Tbilisi State U.) ; Oller, José A. (Murcia U.) ; Wang, Qian (South China Normal U. ; Beijing, Inst. High Energy Phys.)
The updated analysis of LHCb of the $\Delta_b^0 \to J/\psi pK^-$ process with an order of magnitude larger data sample led to three narrow pentaquark states, i.e. $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. [...]
2020 - Published in : 10.1142/9789811219313_0045
In : XVIII International Conference on Hadron Spectroscopy and Structure, Guilin, China, 16 - 21 Aug 2019, pp.275-280

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Coupled-channel interpretation of the LHCb double-$J/\psi$ spectrum and hints of a new state near the $J/\psi J/\psi$ threshold / Dong, Xiang-Kun (Beijing, Inst. Theor. Phys. ; Beijing, GUCAS) ; Baru, Vadim (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP ; Kurchatov Inst., Moscow ; Lebedev Inst.) ; Guo, Feng-Kun (Beijing, Inst. Theor. Phys. ; Beijing, GUCAS) ; Hanhart, Christoph (IAS, Julich ; Julich, Forschungszentrum ; JCHP, Julich) ; Nefediev, Alexey (LPI, Moscow (main) ; Moscow, MIPT)
Recently, the LHCb Collaboration reported pronounced structures in the invariant mass spectrum of $J/\psi$-pairs produced in proton-proton collisions at the Large Hadron Collider. In this Letter, we argue that the data can be very well described within two variants of a coupled-channel approach employing $T$-matrices consistent with unitarity: (i) with just two channels, $J/\psi J/\psi$ and $\psi(2S)J/\psi$, as long as energy-dependent interactions in these channels are allowed, or (ii) with three channels $J/\psi J/\psi$, $\psi(2S)J/\psi$ and $\psi(3770)J/\psi$ with just constant contact interactions. [...]
arXiv:2009.07795.- 2021-09-07 - 6 p. Article from SCOAP3: PDF; Fulltext: PDF;

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Interpretation of the LHCb $P_c$ States as Hadronic Molecules and Hints of a Narrow $P_c(4380)$ / Du, Meng-Lin (Bonn U. ; Bonn U., HISKP) ; Baru, Vadim (Bonn U. ; Bonn U., HISKP ; Moscow, ITEP ; Lebedev Inst.) ; Guo, Feng-Kun (Beijing, KITPC ; Beijing, GUCAS) ; Hanhart, Christoph (IAS, Julich ; JCHP, Julich) ; Meißner, Ulf-G (Bonn U. ; Bonn U., HISKP ; IAS, Julich ; JCHP, Julich ; Tbilisi State U.) ; Oller, José A. (Murcia U.) ; Wang, Qian (South China Normal U. ; TPCSF, Beijing)
Three hidden-charm pentaquark $P_c$ states, $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ were revealed in the $\Lambda_b^0\to J/\psi p K^-$ process measured by LHCb using both run I and run II data. Their nature is under lively discussion, and their quantum numbers have not been determined. [...]
arXiv:1910.11846.- 2020-02-20 - 7 p. - Published in : Phys. Rev. Lett. 124 (2020) 072001 Article from SCOAP3: PDF; Fulltext: PDF;

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Supernova Constraints on MeV Dark Sectors from e+ e- Annihilations / Dreiner, Herbert K. (Bonn U.) ; Fortin, Jean-François (CERN ; Stanford U., Phys. Dept. ; Stanford U., ITP) ; Hanhart, Christoph (Julich, Forschungszentrum) ; Ubaldi, Lorenzo (Bonn U.)
Theories with dark forces and dark sectors are of interest for dark matter models. In this paper we find the region in parameter space that is constrained by supernova cooling constraints when the models include dark sector particles with masses around 100 MeV or less. [...]
arXiv:1310.3826; BONN-TH-2013-18; CERN-PH-TH-2013-242; SU-ITP-13-19; CETUP2013-017; BONN-TH-2013-18; CERN-PH-TH-2013-242; SU-ITP-13-19; CETUP2013-017.- 2014-05-16 - 9 p. - Published in : Phys. Rev. D 89 (2014) 105015 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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