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High Energy Physics - Lattice

New submissions

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New submissions for Fri, 22 Jun 18

[1]  arXiv:1806.08190 [pdf, other]
Title: Higher-order hadronic-vacuum-polarization contribution to the muon g-2 from lattice QCD
Comments: 11 pages, 5 tables, 5 figures
Subjects: High Energy Physics - Lattice (hep-lat)

We calculate the ${{\rm O}}(\alpha^3)$ hadronic-vacuum-polarization contribution to the muon anomalous magnetic moment for the first time from $ab$-$initio$ lattice QCD. We employ previously-published results for the Taylor coefficients of the renormalized vacuum polarization function that were obtained on four-flavor QCD gauge-field configurations with physical light-quark masses. We obtain $10^{10} a_\mu^{\rm HVP,HO} = -9.3(1.3)$, in agreement with determinations from $e^+e^- \to {\rm hadrons}$ data plus dispersion relations. The total uncertainty is below the target precision of the Muon $g-2$ Experiment. We also provide new expressions suitable for computing the ${{\rm O}}(\alpha^3)$ hadronic vacuum polarization contributions from the renormalized vacuum polarization function ${\widehat\Pi}(q^2)$, or directly from the lattice vector-current correlator in Euclidean space.

Cross-lists for Fri, 22 Jun 18

[2]  arXiv:1806.07813 (cross-list from hep-ph) [pdf, ps, other]
Title: There Is No Proof of Thermalized Quark-Gluon Plasma at RHIC and LHC
Authors: Gouranga C Nayak
Comments: 14 pages latex
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Lattice (hep-lat); Nuclear Theory (nucl-th)

Although Tevatron has discovered top quark and LHC (pp collisions) has discovered Higgs boson but the RHIC and LHC heavy-ion colliders have not discovered thermalized quark-gluon plasma (QGP). This is because the experimental data of top quark at Tevatron and the experimental data of Higgs boson at LHC are compared with the exact first principle calculation but the experimental data at RHIC and LHC are compared with simplistic models and assumptions which are not exact first principle calculation. In this paper we show that the exact first principle method to study quark-gluon plasma at RHIC and LHC is the nonequilibrium-nonperturbative QCD by using closed-time path integral formalism. Hence in the absence of such exact first principle calculation we conclude that there is no proof of thermalized quark-gluon plasma at RHIC and LHC.

[3]  arXiv:1806.07994 (cross-list from nucl-th) [pdf, other]
Title: Neutron-proton scattering with lattice chiral effective field theory at next-to-next-to-next-to-leading order
Comments: 24 pages, 14 figures and 2 tables
Subjects: Nuclear Theory (nucl-th); High Energy Physics - Lattice (hep-lat)

We present a new lattice formulation of chiral effective field theory interactions with a simpler decomposition into spin channels. With these interactions the process of fitting to the empirical scattering phase shifts is simplified, and the resulting lattice phase shifts are more accurate than in previous studies. We present results for the neutron-proton system up to next-to-next-to-next-to-leading order for lattice spacings of $1.97~{\rm fm}$, $1.64~{\rm fm}$, $1.32~{\rm fm}$, and $0.99~{\rm fm}$. Our results provide a pathway to $\textit{ab initio}$ lattice calculations of nuclear structure, reactions, and thermodynamics with accurate and systematic control over the chiral nucleon-nucleon force.

Replacements for Fri, 22 Jun 18

[4]  arXiv:1710.11618 (replaced) [pdf, other]
Title: On the gauge invariant path-integral measure for the overlap Weyl fermions in $\underline{16}$ of SO(10)
Authors: Yoshio Kikukawa
Comments: 67 pages, references added, a wrong explanation in the last paragraph of subsec. 4.1 corrected, and revised
Subjects: High Energy Physics - Lattice (hep-lat); High Energy Physics - Theory (hep-th)
[ total of 4 entries: 1-4 ]
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