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Phenomenological predictions for pentaquark masses from fits to baryon masses
KTH, School of Engineering Sciences (SCI), Physics. AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0003-2189-0287
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. KTH Royal Inst Technol, Sch Engn Sci, AlbaNova Univ Ctr, Dept Phys, Roslagstullsbacken 21, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0002-3525-8349
2020 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 800, article id 135108Article in journal (Refereed) Published
Abstract [en]

We investigate the mass spectra of exotic hadrons known as pentaquarks. We extend a simple phenomenological model based on the Gursey-Radicati mass formula for hadrons to include both charmed and bottom baryons as well as to be able to predict masses of pentaquark states including both charm and bottom quark-antiquark pairs. In particular, we perform numerical fits of this model, which includes seven free parameters, to masses of 21 baryons. We find that the model can be well fitted to the experimental values of the baryon masses and observe that the predicted value of about 4400 MeV for the mass of the pentaquark P-c(4380)(+) lies within the experimental range reported by the LHCb experiment. In addition, the predicted value of about 4500 MeV for the mass of the pentaquark P-c(4450)(+) is close to the experimental value. Finally, in the future, other predicted values for masses of additional pentaquarks could be shown to agree with upcoming experimental results.

Place, publisher, year, edition, pages
ELSEVIER , 2020. Vol. 800, article id 135108
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Subatomic Physics
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URN: urn:nbn:se:kth:diva-266921DOI: 10.1016/j.physletb.2019.135108ISI: 000503832500042Scopus ID: 2-s2.0-85075556683OAI: oai:DiVA.org:kth-266921DiVA, id: diva2:1393220
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QC 20200214

Available from: 2020-02-14 Created: 2020-02-14 Last updated: 2020-02-14Bibliographically approved

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Holma, PontusOhlsson, Tommy

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