arXiv subjects

Tanmoy Bhattacharya

Publications and source records attributed to Tanmoy Bhattacharya.

149 records · Page 9Linked to original sources

arXiv1995

Decay constants with Wilson fermions at $β=6.0$

We present results of a high statistics study of $f_π$, $f_K$, $f_D$, $f_{D_s}$, and $f_V^{-1}$ in the quenched approximation using Wilson fermions at $β=6.0$ on $32^3 \times 64$ lattices. We find that the various sources of systematic errors (due to setting the quark masses, renormalization constant, and lattice scale) are now larger than the statistical errors. Our best estimates, without extrapolation to the continuum limit, are $f_π=134(4) \MeV$, $f_K =159(3) \MeV$, $f_D = 229(7) \MeV$, $f_{D_s} = 260(4) \MeV$, and $f_V^{-1}(m_ρ) = 0.33(1)$, where only statistical errors have been shown. We discuss the extrapolation to the continuum limit by combining our data with those from other collaborations.

hep-lat↗

arXiv1995

Phenomenology from 100 large lattices

We present a status report on simulations being done on $32^3 \times 64$ lattices at $β= 6.0$ using quenched Wilson fermions. Phenomenologically relevant results for the spectrum, decay constants, the kaon B-parameter $B_K$, $B_7$, $B_8$, semi-leptonic and $B\to K^* γ$ form factors are given based on a statistical sample of 100 configurations.

hep-lat↗

arXiv1994

Semi-leptonic form-factors from lattice qcd

We present results for semi-leptonic form-factors obtained on a statistical sample of $66$ $32^3 \times 64$ lattices at $β= 6.0$ using quenched Wilson fermions. We find $f_+^{D \to K l ν}(q^2 = 0) = 0.73 \pm 0.06$, $A_2/A_1({D \to K^* l ν}) = 0.72 \pm 0.22$, $V/A_1({D_s \to ϕl ν}) = 1.91 \pm 0.04$, and $A_2/A_1({D_s \to ϕl ν}) = 0.68 \pm 0.09$, where the error estimate includes statistical errors and errors due to extrapolation to $q^2 =0$ and to physical values of $(m_u + m_d)/2$ and $m_s$. The remaining sources of systematic errors are those due to $O(a)$ discretization errors and those due to quenching, which our results indicate may be small. We also comment on the validity of pole-dominance in these form-factors. Source available from http://nqcd.lanl.gov/Lattice_QCD/papers/dpf94/

hep-ph↗

arXiv1994

A pot-pourri of results in QCD from large lattice simulations on the CM5

We present a status report on simulations being done on $32^3 \times 64$ lattices at $β= 6.0$ using quenched Wilson fermions. Results for the spectrum, decay constants, the kaon B-parameter $B_K$, and semi-leptonic form factors are given based on the current statistical sample of 28 configurations. These ``Grand Challenge'' calculations are being done on the CM5 at Los Alamos in collaboration with G. Kilcup, S. Sharpe and P. Tamayo. We end with a brief statement of code performance.

hep-lat↗

arXiv1993

Semileptonic form factors of heavy-light mesons from lattice QCD

The form factors for the semileptonic decays of heavy-light pseudoscalar mesons of the type $D \to Keν$ are studied in quenched lattice QCD at $β=6.0$ using Wilson fermions. We explore new numerical techniques for improving the signal and study $O(a)$ corrections using three different lattice transcriptions of the vector current. We present a detailed discussion of the relation of these lattice currents to the continuum vector current and show that the disagreement between the previous results is to a large extent due to the value of $Z_V$ used in the calculations. We also present results for the decay constants of light-light, heavy-light and heavy-heavy mesons.

hep-lat↗