132 research outputs found
Noise reduction algorithm for Glueball correlators
We present an error reduction method for obtaining glueball correlators from
monte carlo simulations of SU(3) lattice gauge theory. We explore the scalar
and tensor channels at three different lattice spacings. Using this method we
can follow glueball correlators to temporal separations even up to 1 fermi. We
estimate the improvement over the naive method and compare our results with
existing computations.Comment: 6 pages, 4 tables and 2 figures, computations at larger volumes
added, article partially rewritten, main conclusions unchange
Heavy light tetraquarks from Lattice QCD
We present preliminary results from a lattice calculation of tetraquark
states in the charm and bottom sector of the type ,
, and . These
calculations are performed on MILC ensembles with lattice
spacing of and . 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. While in double charm sector we find shallow bound levels, our results
suggest deeply bound levels with double bottom tetraquarks.Comment: Corrected threshold for the tetraquark state.
Proceedings of the 35th International Symposium on Lattice Field Theory,
18-24 June 2017, Granada, Spain. TIFR preprint no : TIFR/TH/17-3
Spectroscopy of Charmed and Bottom Hadrons using Lattice QCD
We present preliminary results on the light, charmed and bottom baryon
spectra using overlap valence quarks on the background of 2+1+1 flavours HISQ
gauge configurations of the MILC collaboration. These calculations are
performed on three different gauge ensembles at three lattice spacings (a ~
0.12 fm, 0.09 fm and 0.06 fm) and for physical strange, charm and bottom quark
masses. The SU(2) heavy baryon chiral perturbation theory is used to
extrapolate baryon masses to the physical pion mass and the continuum limit
extrapolations are also performed. Our results are consistent with the well
measured charmed baryons. We predict the masses of many other states which are
yet to be discovered.Comment: 8 pages, Proceedings of the 35th International Symposium on Lattice
Field Theory (Lattice 2017
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