scholarly journals RADIATIVE π-γ TRANSITIONS OF EXCITED LIGHT-QUARK MESONS IN THE COVARIANT OSCILLATOR QUARK MODEL

2014 ◽  
Vol 35 ◽  
pp. 1460454 ◽  
Author(s):  
TOMOHITO MAEDA ◽  
KENJI YAMADA ◽  
MASUHO ODA ◽  
SHIN ISHIDA
Keyword(s):  
Quark Model ◽  
Single Photon ◽  
Light Quark ◽  
Experimental Studies ◽  
Light Meson ◽  
Transition Rates ◽  
Compass Collaboration ◽  
Model Classification ◽  
Internal Structures

A study of the light-meson couplings to the single photon in the framework of the covariant oscillator quark model (COQM) is reported. The transition rates of {ρ(770), b1(1235), a1(1260), a2(1320), π2(1670), ρ3(1690), ρ(1700)}± into π±γ, being expected to be measured by the COMPASS collaboration in their Primakoff-reaction experiments, are calculated. It could be useful not only for understanding the internal structures of observed light-quark mesons and their quark-model classification but also for the ongoing experimental studies by COMPASS.

A NEW METRIC DESIGN TO AUTOMATIC DETECTION OF PATIENT MOTION IN SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY

2013 ◽  
Vol 25 (06) ◽  
pp. 1350053
Author(s):  
Valiallah Saba ◽  
Saeed Setayeshi
Keyword(s):  
Linear Prediction ◽  
Single Photon ◽  
Photon Emission ◽  
Experimental Studies ◽  
Emission Computed Tomography ◽  
Projection Data ◽  
Distance Metrics ◽  
Distance Metric ◽  
High Detection Rate ◽  
Prediction Filter

Amongst the motion detection and correction algorithms during the scanning procedures, data-processing methods are the most frequently proposed solution to detect and correct patient motions. There are different distance metrics which have been used to detect the patient motions using information contained in the projections. Unfortunately, the performance of usually used metrics is low in the case of small motions while detecting the motions with magnitude of 1 pixel and smaller are very important in the accuracy of diagnosis. In this work, a new distance metric, normalized prediction of projection data algorithm (NPPDA) is developed based on the linear prediction filter. The performance of the NPPDA is quantitatively evaluated and compared with usual distance metrics by different experimental studies. A high detection rate is achieved by means of the newly developed distance metric, NPPDA.

scholarly journals Light-meson masses in an unquenched quark model

2018 ◽  
Vol 97 (9) ◽  
Author(s):  
Xiaoyun Chen ◽  
Jialun Ping ◽  
Craig D. Roberts ◽  
Jorge Segovia
Keyword(s):  
Quark Model ◽  
Light Meson

scholarly journals DECAY CONSTANTS OF HEAVY–LIGHT MESONS IN THE RELATIVISTIC QUARK MODEL

2002 ◽  
Vol 17 (13) ◽  
pp. 803-807 ◽  
Author(s):  
D. EBERT ◽  
R. N. FAUSTOV ◽  
V. O. GALKIN
Keyword(s):  
Quark Model ◽  
Light Quark ◽  
Relativistic Effects ◽  
Relativistic Quark Model ◽  
Sum Rule ◽  
Decay Constants ◽  
Model Predictions ◽  
Relativistic Treatment ◽  
Light Mesons ◽  
Good Agreement

The decay constants of pseudoscalar and vector heavy–light mesons are calculated in the framework of the relativistic quark model with the completely relativistic treatment of the light quark. It is argued that relativistic effects play a significant role. Good agreement of the model predictions with recent lattice and QCD sum rule calculations as well as available experimental data are found.

scholarly journals Universal light quark mass dependence and heavy-light meson spectroscopy

2004 ◽  
Vol 69 (7) ◽  
Author(s):  
Theodore J. Allen ◽  
Todd Coleman ◽  
M. G. Olsson ◽  
Siniša Veseli
Keyword(s):  
Quark Mass ◽  
Light Quark ◽  
Light Meson ◽  
Mass Dependence ◽  
Meson Spectroscopy ◽  
Light Quark Mass ◽  
Quark Mass Dependence

LIGHT MESON STUDIES WITH WASA-AT-COSY

2014 ◽  
Vol 35 ◽  
pp. 1460446
Author(s):  
L. HEIJKENSKJÖLD ◽  
Keyword(s):  
Present Status ◽  
Experimental Studies ◽  
Theoretical Models ◽  
Light Meson ◽  
Wide Angle ◽  
Fixed Target ◽  
Proton Proton ◽  
Light Mesons

Detailed experimental studies of the decays and interactions of light mesons, such as π0, η and ω, are highly needed as precision tests for theoretical models. The Wide Angle Shower Apparatus (WASA) detector is one of the available experimental set-ups optimized for studying production and decays of light mesons. In contrast to the focus of this workshop, the mesons are produced through proton-proton or proton-deuteron collisions using a fixed target. This paper will present status of studies performed by the WASA-at-COSY collaboration in the field of light meson interactions.

scholarly journals N* Experiments and what they tell us about Strong QCD Physics

2020 ◽  
Vol 241 ◽  
pp. 01004
Author(s):  
V. D. Burkert
Keyword(s):  
Excited States ◽  
Degrees Of Freedom ◽  
Full Employment ◽  
Light Quark ◽  
Experimental Studies ◽  
Form Factors ◽  
Negative Parity ◽  
Helicity Amplitudes ◽  
Coupled Channel ◽  
Electromagnetic Beams

I give an overview on experimental studies of the spectrum and the structure of the excited states of the nucleon and what we can learn about their in ternal structure. One focus is on the efforts to obtain a more complete picture of the light-quark baryon exci tation spectrum employing electromagnetic beams that will allow us to draw some conclusions on the symme tries underlying the spectrum. For the higher mass ex citations, the full employment of coupled channel ap proaches is essential when searching for new excited states in the large amounts of data already accumulated in different channels involving a variety of polarization observables. The other focus is on the study of transition form factors and helicity amplitudes and their de pendences on Q2, especially on some of the more promi nent resonances, especially Δ(1232)3/2+, N(1440)1/2+, and negative parity states N(1535)1/2-, and N(1675)5/2-.These were obtained in pion and eta electroproduction experi ments off proton targets and have already led to further insights in the active degrees-of-freedom as a function of the distance scale involved.

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