scholarly journals Mass formula for light nonstrange mesons and Regge trajectories in quark model

2017 ◽  
Vol 32 (25) ◽  
pp. 1750153 ◽  
Author(s):  
Duojie Jia ◽  
Cheng-Qun Pang ◽  
Atsushi Hosaka
Keyword(s):  
Experimental Data ◽  
Angular Momentum ◽  
Quark Model ◽  
Excited States ◽  
Orbital Angular Momentum ◽  
Mass Formula ◽  
Field Method ◽  
Auxiliary Field ◽  
Regge Trajectories ◽  
Light Mesons

We study the Regge-like spectra of light mesons in a relativized quark model. An analytical mass formula is presented for the light unflavored mesons with the help of auxiliary field method, by which a quasi-linear Regge–Chew–Frautschi plot is predicted for the orbitally excited states. We show that the trajectory slope is proportional to the inverse of the confining parameter [Formula: see text] when the orbital angular momentum [Formula: see text] is large. The result is tested against the experimental data of the spectra of the meson families [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] in the [Formula: see text] planes, with the fitted parameters consistent with that in the literatures.

scholarly journals A quark model analysis of orbital angular momentum

1999 ◽  
Vol 460 (1-2) ◽  
pp. 8-16 ◽  
Author(s):  
Sergio Scopetta ◽  
Vicente Vento
Keyword(s):  
Angular Momentum ◽  
Quark Model ◽  
Orbital Angular Momentum ◽  
Model Analysis

The chemical shift. II. A study of 14N chemical shifts in nitrogen–oxygen–halogen compounds

1970 ◽  
Vol 48 (22) ◽  
pp. 3504-3509 ◽  
Author(s):  
F. Aubke ◽  
F. G. Herring ◽  
A. M. Qureshi
Keyword(s):  
Angular Momentum ◽  
Chemical Shift ◽  
Excited States ◽  
Orbital Angular Momentum ◽  
Chemical Shifts ◽  
Hartree Fock ◽  
Halogen Compounds ◽  
Good Agreement

The chemical shifts of the 14N nucleus in a number of nitrogen–halogen–oxygen compounds have been estimated within the framework of the i.n.d.o.-l.c.a.o.-s.c.f. method using approximate perturbed Hartree–Fock theory. Generally good agreement with experiment is achieved. The calculations indicate that the variation in 14N chemical shift is due to either changes in orbital angular momentum, or to the presence of low lying excited states, or to a combination of both effects.

Measuring the Sea Quark Sivers Asymmetry: The E1039 Experiment at Fermilab

2015 ◽  
Vol 37 ◽  
pp. 1560064
Author(s):  
Andi Klein
Keyword(s):  
Experimental Data ◽  
Angular Momentum ◽  
Transverse Momentum ◽  
Proton Beam ◽  
Orbital Angular Momentum ◽  
Nucleon Spin ◽  
Spin Direction ◽  
Sivers Function

One of the continuing puzzles in QCD is the origin of the nucleon spin. All of the existing experimental data suggest that the contributions from the quark and gluon spins account only for about 50% of the nucleon spin. In order to account for the remaining 50%, one has to include the orbital angular momentum of the quarks and gluons. One way to establish if quarks carry significant angular momentum, is to perform a measurement of the Sivers function, which describes the correlation of the spin direction of the nucleon with the transverse momentum of the quark. We will describe the E1039 experiment at Fermilab, which will measure the Sivers asymmetry of the sea quarks via the Drell-Yan process, using a 120 GeV unpolarized proton beam on a transversely polarized NH 3 target.

New empirical formula for α-decay calculations

2018 ◽  
Vol 27 (08) ◽  
pp. 1850068 ◽  
Author(s):  
Dashty T. Akrawy ◽  
Ali H. Ahmed
Keyword(s):  
Experimental Data ◽  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Ground State ◽  
Empirical Formula ◽  
State Transitions ◽  
Α Decay ◽  
O Isotopes

A set of empirical formulae have been proposed to calculate the [Formula: see text]-decay half-lives from ground state to ground state transitions of 356 nuclei classified to different set of e–e, e–o, o–e and o–o isotopes. Within these formulae, modification of the previous set of Royer expressions were done by introducing three different physical terms, including the orbital angular momentum and isobaric asymmetry factors. The predicted [Formula: see text]-decay half-lives compared with those adopted by former proposed models for the depended experimental data, and significant improvements were noticed for all the studied sets of isotopes.

scholarly journals BARYON SPECTRA IN DEFORMED OSCILLATOR QUARK MODEL

1998 ◽  
Vol 13 (21) ◽  
pp. 1699-1707 ◽  
Author(s):  
A. HOSAKA ◽  
H. TOKI ◽  
M. TAKAYAMA
Keyword(s):  
Experimental Data ◽  
Symmetry Breaking ◽  
Quark Model ◽  
Excited States ◽  
Principal Quantum Number ◽  
Chiral Symmetry Breaking ◽  
Quark Confinement ◽  
Spatial Deformation ◽  
Deformed Oscillator ◽  
Baryon Spectra

We study theoretically the baryon spectra in terms of a deformed oscillator quark (DOQ) model. This model is motivated by confinement of quarks and chiral symmetry breaking, which are the most important nonperturbative phenomena of QCD. The minimization of the DOQ Hamiltonian with respect to the deformation for each principal quantum number results in deformations for the intrinsic states of excited baryonic states. We find that the resulting baryon spectra agree very well with the existing experimental data including SU(3) baryons. The spatial deformation of the baryonic excited states carry useful information on the quark confinement and provide a clue to understand the confining mechanism.

scholarly journals CHARM SPECTROSCOPY FROM B FACTORIES

2011 ◽  
Vol 02 ◽  
pp. 158-162
Author(s):  
◽  
J. BENITEZ
Keyword(s):  
Angular Momentum ◽  
Excited States ◽  
Orbital Angular Momentum ◽  
Precision Measurement ◽  
D Mesons ◽  
Final States

A brief review of the excited Ds and D mesons is presented. A precision measurement of the Ds1(2536) mass and width parameters is reported by BABAR. Finally, a recent BABAR study of the Dπ and D*π final states shows first observations of the radial excitations of the D0, D*0, and D*+, as well as the L = 2 excited states of the D0 and D+, where L is the orbital angular momentum of the quarks.

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