Upper Bound on Possible Mass Spectra from Single-Particle Saturation of Current Algebra Sum Rules

1967 ◽  
Vol 19 (6) ◽  
pp. 332-335 ◽  
Author(s):  
I. T. Grodsky ◽  
M. Martinis ◽  
M. S̀wiȩcki
Keyword(s):  
Current Algebra ◽  
Single Particle ◽  
Upper Bound ◽  
Mass Spectra ◽  
Sum Rules

LIMITS SET BY ANALYTICITY AND CURRENT ALGEBRA ON THE EXISTENCE OF A HEAVY NUCLEON

1990 ◽  
Vol 05 (02) ◽  
pp. 101-106 ◽  
Author(s):  
LUIS MASPERI ◽  
GALILEO VIOLINI
Keyword(s):  
Excited State ◽  
Current Algebra ◽  
Upper Bound ◽  
Sum Rules ◽  
Dispersion Relations ◽  
Order Of Magnitude ◽  
Pion Nucleon ◽  
Analysis Of Dispersion

We estimate through the analysis of dispersion relations and current algebra sum rules that the experimentally searched excited state of nucleon with mass below pion-nucleon threshold must have a coupling one order of magnitude smaller than the normal pion-nucleon one [Formula: see text] as an upper bound.

Mass spectra of the heavy baryonsΛQandΣQ(*)from QCD sum rules

2008 ◽  
Vol 77 (9) ◽  
Author(s):  
Jian-Rong Zhang ◽  
Ming-Qiu Huang
Keyword(s):  
Mass Spectra ◽  
Sum Rules ◽  
Qcd Sum Rules

scholarly journals Single-particle measurements of bouncing particles and in situ collection efficiency from an airborne aerosol mass spectrometer (AMS) with light-scattering detection

2017 ◽  
Vol 10 (10) ◽  
pp. 3801-3820 ◽  
Author(s):  
Jin Liao ◽  
Charles A. Brock ◽  
Daniel M. Murphy ◽  
Donna T. Sueper ◽  
André Welti ◽  
...  
Keyword(s):  
Light Scattering ◽  
Mass Spectrometer ◽  
Single Particle ◽  
Total Mass ◽  
Mass Spectra ◽  
Collection Efficiency ◽  
Aerosol Mass Spectrometer ◽  
Mass Spectral ◽  
Aerosol Mass ◽  
Spectral Signal

Abstract. A light-scattering module was coupled to an airborne, compact time-of-flight aerosol mass spectrometer (LS-AMS) to investigate collection efficiency (CE) while obtaining nonrefractory aerosol chemical composition measurements during the Southeast Nexus (SENEX) campaign. In this instrument, particles scatter light from an internal laser beam and trigger saving individual particle mass spectra. Nearly all of the single-particle data with mass spectra that were triggered by scattered light signals were from particles larger than ∼ 280 nm in vacuum aerodynamic diameter. Over 33 000 particles are characterized as either prompt (27 %), delayed (15 %), or null (58 %), according to the time and intensity of their total mass spectral signals. The particle mass from single-particle spectra is proportional to that derived from the light-scattering diameter (dva-LS) but not to that from the particle time-of-flight (PToF) diameter (dva-MS) from the time of the maximum mass spectral signal. The total mass spectral signal from delayed particles was about 80 % of that from prompt ones for the same dva-LS. Both field and laboratory data indicate that the relative intensities of various ions in the prompt spectra show more fragmentation compared to the delayed spectra. The particles with a delayed mass spectral signal likely bounced off the vaporizer and vaporized later on another surface within the confines of the ionization source. Because delayed particles are detected by the mass spectrometer later than expected from their dva-LS size, they can affect the interpretation of particle size (PToF) mass distributions, especially at larger sizes. The CE, measured by the average number or mass fractions of particles optically detected that had measurable mass spectra, varied significantly (0.2–0.9) in different air masses. The measured CE agreed well with a previous parameterization when CE > 0.5 for acidic particles but was sometimes lower than the minimum parameterized CE of 0.5.

Dispersive sum rules from current algebra

1967 ◽  
Vol 22 (1-4) ◽  
pp. 239-280 ◽  
Author(s):  
G. Furlan ◽  
C. Rossetti
Keyword(s):  
Current Algebra ◽  
Sum Rules

U(3)Current Algebra and Spectral Sum Rules for Vector Mesons

1969 ◽  
Vol 188 (5) ◽  
pp. 2117-2120 ◽  
Author(s):  
B. R. Wienke ◽  
N. G. Deshpande
Keyword(s):  
Current Algebra ◽  
Sum Rules ◽  
Vector Mesons ◽  
Spectral Sum Rules
Sign in / Sign up

Export Citation Format

Share Document