ELFT HÍRADÓ

[Somogyi Gábor <somogyi.gabor AT wigner.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


           George Rupp
           (CFTP, Lisbon)


"Scalar-Meson Pole Trajectories”


címmel tartandó szemináriumára.


Kivonat:



The light scalar mesons have been haunting both theorists and 
experimentalists for many years, as their low masses cannot be understood in 
the context of the static constituent quark model. This led R.L. Jaffe in 
1977 to suggest a description in terms of tetraquark configurations, thus 
allowing to obtain scalar-meson masses below 1 GeV owing to a very large and 
attractive colour-hyperfine interaction. However, a few years later my 
co-authors and I showed that the light scalar mesons can be reproduced as 
dynamical quark-antiquark resonances, provided that the effects of strong 
decay are included non-perturbatively. This has been confirmed in recent 
years with lattice simulations. 

In models and on the lattice, much can be learned about the nature of the 
scalar mesons from their mass dependence on coupling constants or the 
employed pion mass. Thus, in the present talk I shall present model results 
for scalar-meson pole trajectories, both as a function of overall coupling 
and of pion mass, the latter allowing to compare with the lattice. The first 
part of my talk will briefly summarise a contribution to the Gribov-90 
Memorial Volume, inspired by Gribov's suggestion of novel mesons as scalar 
vacuum excitations of a condensate of light quark-antiquark pairs.



Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2024 május 6. hétfő d.e. 11 óra (SZOKÁSOSTÓL ELTÉRŐ IDŐPONT)

Szívesen látunk minden érdeklődőt.


                      Somogyi Gábor