Tapobrata Bhattacharya

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In Reference [1], we studied the improvement of the Wilson-Dirac theory by removing all lattice artifacts linear in the lattice spacing a in on-shell matrix elements. In general, such an improvement for the dimension 3 fermion bilinear operators requires one to tune the coefficient of the clover operator in the action, determine the coefficient of an extra(More)
One of the primary goals of phenomenology is to determine the fundamental parameters of the standard model. Of these, the five quark masses mu,md,ms,mc,mb are amongst the least well known, and cannot be measured in experiments. They have to be inferred from the pattern of the observed hadron spectrum (chiral perturbation theory (χPT), HQET, and lattice QCD(More)
We develop an ansatz for expressing the free energy of the two dimensional q-states Potts model for q > 4 near its first order phase transition point. We notice that for the moderate values of q . 15, the energy profile at the phase transition is not expressible as a sum of gaussians. We discuss how this affects the traditional finite size analysis of this(More)
This talk summarizes the quenched calculation of fB and fBs presented in [1]. The heavy quark is simulated using an O(1/M) improved NRQCD action, and the tadpole improved clover action is used for the light quarks. The axial current includes the O(1/M) corrections in one-loop perturbation theory and the O(1/M) ones at tree-level. We discuss the various(More)
We estimate, using a large-scale Monte Carlo simulation, the critical exponents of the antiferromagnetic Heisenberg model on a stacked triangular lattice. We obtain the following estimates: γ/ν = 2.011± .014, ν = .585± .009. These results contradict a perturbative 2 + ǫ Renormalization Group calculation that points to Wilson-Fisher O(4) behaviour. While(More)
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