[seminar] Maxim Polyakov, 24.03. (četvrtak) 14h (c.t.), predavaona III krila IRB

[Kornelija Passek-Kumericki]

                       SEMINAR  TEORIJSKE  FIZIKE


   (Zajednički seminari Fizičkog odsjeka PMF-a te Zavoda za teorijsku
    fiziku i Zavoda za eksperimentalnu fiziku IRB-a)

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LHCb pentaquarks


Maxim Polyakov
Ruhr-Universitaet Bochum


   Datum:  cetvrtak, 24. ozujak 2016.
   Vrijeme: 14 sati c.t.
   Mjesto: IRB, predavaona III krila



Sazetak:

We interpret the newly discovered pentaquark $P_c(4450)$ as a bound state of
charmonium $\psi(2S)$ and the nucleon. The binding potential is due to
charmonium-nucleon interaction that in the heavy quark approximation is
proportional to the product of the charmonium chromoelectric polarizability
and the nucleon energy-momentum distribution. We use the large $N_c$
expansion to estimate the quarkonium polarizability and calculate the
nucleon properties in the framework of the mean-field picture of light
baryons. Two almost degenerate states $J^P=(1/2)^-$ and $J^P=(3/2)^-$ are
predicted at the position of the $P_c(4450)$ pentaquark. We find that the
nucleon-$\psi(2S)$ bound state has a naturally narrow width in the range of
tens of MeV. The unitary multiplet partners of the $P_c(4450)$ pentaquark
and the generalization to $b \bar b$-nucleon pentaquark bound states are
discussed.



Voditeljica seminara: Kornelija Passek-Kumericki (passek at irb dot hr)
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