Los Alamos National Laboratory

Los Alamos National Laboratory

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Lattice QCD

Understanding discoveries at the Energy, Intensity, and Cosmic Frontiers

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Lattice QCD at Los Alamos

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Figure: (Above) The behavior of (energy – 3 x pressure) of QCD as a function of the temperature calculated by the HotQCD collaboration. The equation of state of QCD is extracted from this data and used in the analysis of experimental data produced in the collisions of relativistic heavy ions at Brookhaven National Lab and the Large Hadron Collider.

Lattice QCD (LQCD) is a non-perturbative formulation on a discrete Eucledian space-time grid of Quantum Chromodynamics (QCD), the regnant theory of strong interactions. Large scale simulations of lattice QCD are providing increasingly precise estimates, from first principles, of many properties of QCD that are being used to both validate QCD and search for new physics beyond the standard model of elementary particles and interactions.

The Los Alamos lattice QCD group has made many pioneering contributions since its inception in 1984. Current members include Tanmoy Bhattacharya, Vicenzo Cirigliano, Michael Graesser, Rajan Gupta, Anosh Joseph (moved to DESY Zeuthen) and Boram Yoon. They are currently engaged in four projects:

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Figure: (Above) The allowed parameter region of novel scalar and tensor interactions at the TeV Scale using different experimental and theoretical inputs invested by the PNDME collaboration. The constraints from different low-energy nuclear experiments using model estimates by colored regions with the improvement on using future Ultra Cold Neutron decay experiments and lattice estimates of matrix elements given by the innermost regions. These low-energy constraints are also compared to those from the LHC. The outer brown dashed line is an existing experimental bound, the middle dashed purple and inner dotted magenta lines are the future near-term and long-term expectations.


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