SEARCH · Engineering Papers
Results for “thresholds”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
J / ψ near threshold in holographic QCD: A and D gravitational form factors
Not Available
Measurement of the e + e − → Λ Λ ¯ cross section from threshold to 3.00 GeV using events with initial-state radiation
Not Available
Measurement of e + e − → Λ Λ ¯ η from 3.5106 to 4.6988 GeV and study of Λ Λ ¯ mass threshold enhancement
Not Available
How to measure the reactor neutrino flux below the inverse beta decay threshold with CE ν NS
Not Available
Updated analysis of near-threshold heavy quarkonium production for probe of proton’s gluonic gravitational form factors
Not Available
Dynamics in near-threshold J / ψ photoproduction
Not Available
Lattice QCD calculation of 𝑥-dependent meson distribution amplitudes at physical pion mass with threshold logarithm resummation
We present a lattice quantum chromodynamics (QCD) calculation of the 𝑥-dependent pion and kaon distribution amplitudes (DA) in the framework of large momentum effective theory. This calculation is performed on a fine lattice of 𝑎 = 0.076 fm at physical pion mass, with the pion boosted to 1.8 GeV and kaon boosted to 2.3 GeV. We renormalize the matrix elements in the hybrid scheme and match to Math output error with a subtraction of the leading renormalon in the Wilson-line mass. The perturbative matching is improved by resumming the large logarithms related to the small quark and gluon momenta in the soft-gluon limit. After resummation, we demonstrate that we are able to calculate a range of 𝑥 ∈[𝑥 0 ,1 − 𝑥 0 ] with 𝑥 0 = 0.25 for pion and 𝑥 0 = 0.2 for kaon with theoretical systematic errors under control. The kaon DA is shown to be slighted skewed, and narrower than pion DA. Although the 𝑥-dependence cannot be direct calculated beyond these ranges, we estimate higher moments of the pion and kaon DAs by complementing our calculation with short-distance factorization.
Observation of a Near-Threshold Structure in the K + Recoil-Mass Spectra in e + e − → K + ( D s − D * 0 + D s * − D 0 )
Not Available
Global QCD Analysis of Pion Parton Distributions with Threshold Resummation
Not Available
Interpretation of Neutral Charm Mesons near Threshold as Unparticles
Not Available
Evidence for a Neutral Near-Threshold Structure in the K S 0 Recoil-Mass Spectra in e + e − → K S 0 D s + D * − and e + e − → K S 0 D s * + D −
Not Available
High-Threshold Quantum Computing by Fusing One-Dimensional Cluster States
Not Available
Observation of the Anomalous Shape of X ( 1840 ) in J / ψ → γ 3 ( π + π − ) Indicating a Second Resonance Near p p ¯ Threshold
Using a sample of ( 10087 ± 44 ) × 10 6 J / ψ events, which is about 45 times larger than that was previously analyzed, a further investigation on the J / ψ → γ 3 ( π + π − ) decay is performed. A significant distortion at 1.84 GeV / c 2 in the line shape of the 3 ( π + π − ) invariant mass spectrum is observed for the first time, which could be resolved by two overlapping resonant structures, X ( 1840 ) and X ( 1880 ) . The new state X ( 1880 ) is observed with a statistical significance larger than 10 σ . The mass and width of X ( 1880 ) are determined to be 1882.1 ± 1.7 ± 0.7 MeV / c 2 and 30.7 ± 5.5 ± 2.4 MeV , respectively, which indicates the existence of a p p ¯ bound state. Published by the American Physical Society 2024
Bond percolation thresholds on Archimedean lattices from critical polynomial roots
Not Available