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- T Bhattacharya, R Lacaze, A Morel, Chercheur Au Cnrs
- 2008

The free energy of the Potts model : from the continuous to the first-order transition region. ABSTRACT We present a large q expansion of the 2d q-states Potts model free energies up to order 9 in 1/ √ q. Its analysis leads us to an ansatz which, in the first-order region, incorporates properties inferred from the known critical regime at q = 4, and… (More)

- T. Bhattacharya
- 1993

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)

- T. Bhattacharya
- 1998

This talk summarizes the quenched calculation of fB and fB s presented in [1]. The heavy quark is simulated using an O(1/M 2) 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 2) ones at tree-level. We discuss the various… (More)

- T. Bhattacharya
- 1997

Significant progress has been made in the determination of the light quark masses, using both lattice QCD and sum rule methods, in the last year. We discuss the different methods and review the status of current results. Finally, we review the calculation of bottom and charm masses.

- T. Bhattacharya
- 1994

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)

- A Ali Khan, T Bhattacharya
- 1996

We present preliminary results from our study of the heavy-light spectrum and decay constants. For the heavy quark, we use NRQCD at various masses around and above the b quark mass. For the first time, the heavy quark action and the heavy-light current consistently include corrections at second order in the non-relativistic expansion, as well as the leading… (More)

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