Abstract
We present preliminary results from a lattice calculation of tetraquark states in the charm and bottom sector of the type udbb, usbb, udcc and scbb. These calculations are performed on Nf = 2 + 1 + 1 MILC ensembles with lattice spacing of a = 0:12 fm and a = 0:06 fm. A relativistic action with overlap fermions is employed for the light and charm quarks while a non-relativistic action with non-perturbatively improved coefficients is used in the bottom sector. Preliminary results provide a clear indication of presence of energy levels below the relevant thresholds of different tetraquark states in the double bottom sector while a scattering state is observed in the charm sector.
Highlights
The discovery of the resonances Zb(10607) & Zb(10650) by BELLE [1] in 2012 has shown the existence of multiquark exotic states in the bottom sector
In the work presented at the conference, we explore the tetraquarks of type udbb, as in Ref [5], confirming a presence of a level well below the threshold state and explore other flavour channels
The calculation has been extended to smaller pion masses and the preliminary results are shown in the right panel
Summary
The discovery of the resonances Zb(10607) & Zb(10650) by BELLE [1] in 2012 has shown the existence of multiquark exotic states in the bottom sector. The calculation in Ref [4] computed a potential of two heavy static antiquarks in presence of two light quarks in lattice QCD. This was used to solve a coupled non-relativistic Schrödinger equation to find a binding energy of ∆E = 90+−4336 MeV in the udbbchannel with I(JP) = 0(1+). In the work presented at the conference, we explore the tetraquarks of type udbb, as in Ref [5], confirming a presence of a level well below the threshold state and explore other flavour channels
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
