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Precision Nucleon Charges and Form Factors Using 2+1-flavor Lattice QCD
Similarly, we find evidence that the $N\pi\pi $ excited state contributes to the correlation functions with the vector current, consistent with the vector meson dominance model.
High Energy Physics - Lattice High Energy Physics - Phenomenology
Contribution of the QCD $Θ$-term to nucleon electric dipole moment
Using the excited state spectrum from fits to the two-point function, we find $d_n^\Theta$ is small, $|d_n^\Theta| \lesssim 0. 01 \overline \Theta e$ fm, whereas for the proton we get $|d_p^\Theta| \sim 0. 02 \overline \Theta e$ fm.
High Energy Physics - Lattice High Energy Physics - Phenomenology
Qubit regularization of asymptotic freedom
We provide strong evidence that the asymptotically free (1+1)-dimensional non-linear O(3) sigma model can be regularized using a quantum lattice Hamiltonian, referred to as the "Heisenberg-comb", that acts on a Hilbert space with only two qubits per spatial lattice site.
High Energy Physics - Lattice Strongly Correlated Electrons High Energy Physics - Theory Nuclear Theory Quantum Physics
Nucleon Momentum Fraction, Helicity and Transversity from 2+1-flavor Lattice QCD
Our final results, in the $\overline{\rm MS}$ scheme at 2 GeV, are $\langle x \rangle_{u-d} = 0. 160(16)(20)$, $\langle x \rangle_{\Delta u-\Delta d} = 0. 192(13)(20)$ and $\langle x \rangle_{\delta u-\delta d} = 0. 215(17)(20)$, where the first error is the overall analysis uncertainty assuming excited-state contributions have been removed, and the second is an additional systematic uncertainty due to possible residual excited-state contributions.
High Energy Physics - Lattice
State preparation and measurement in a quantum simulation of the O(3) sigma model
Recently, Singh and Chandrasekharan showed that fixed points of the non-linear O(3) sigma model can be reproduced near a quantum phase transition of a spin model with just two qubits per lattice site.
Quantum Physics High Energy Physics - Lattice
SEIR and Regression Model based COVID-19 outbreak predictions in India
In this study, outbreak of this disease has been analysed for India till 30th March 2020 and predictions have been made for the number of cases for the next 2 weeks.
