Polarization of the. chi. sub c 2 in p p annihilation: Massless QCD versus diquarks

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.4340· OSTI ID:7287185

Anselmino, M ^[1]; Caruso, F ^[2]; Mussa, R ^[3]

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1. Dipartimento di Fisica Teorica, Universita di Torino, Torino (Italy) Instituto Nazionale di Fisica Nucleare, Sezione di Cagliari, Via Pietro Giuria 1, I-10125 Torino (Italy)
2. Centro Brasileiro de Pesquisas Fisicas/Conselho Nacional de Desenvolvimento Cientifico e Technologico, Rua Dr. Xavier Sigaud 150, 22290, Rio de Janeiro (Brazil) Instituto de Fisica, Universidade do Estado do Rio de Janeiro, Rio de Janeiro (Brazil)
3. Dipartimento di Fisica Sperimentale, Universita di Torino, Torino (Italy) Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Via Pietro Giuria 1, I-10125 Torino (Italy)

The measurement of the diagonal spin-density matrix elements {rho}{sub {ital M}{ital M}} of the {chi}{sub {ital c}2} produced in exclusive {ital p{bar p}} annihilation, via its radiative decay into {ital J}/{psi}{gamma}, can discriminate between different nucleon models. Whereas perturbative massless QCD predicts the {chi}{sub {ital c}2} to be entirely in {ital M}={plus minus}1 states (i.e., only {rho}{sub 11}={rho}{sub {minus}1{minus}1}{ne}0), quark-diquark models of the nucleon allow also {ital M}=0 states ({rho}{sub 00}{ne}0). Predictions of a particular model are given.

• OSTI ID: 7287185
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:11; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662230* -- Quantum Chromodynamics-- (1992-)
662340 -- Hadron Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR MOMENTUM
ANNIHILATION
BARYON-BARYON INTERACTIONS
BARYONS
BASIC INTERACTIONS
BRANCHING RATIO
COMPOSITE MODELS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EQUATIONS
EXCLUSIVE INTERACTIONS
FERMIONS
FIELD THEORIES
HADRON-HADRON INTERACTIONS
HADRONS
HELICITY
INTERACTIONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATRIX ELEMENTS
NUCLEON-ANTINUCLEON INTERACTIONS
NUCLEONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PARTICLE STRUCTURE
PERTURBATION THEORY
POLARIZED PRODUCTS
PROTON-ANTIPROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
RADIATIVE DECAY
SPIN
SUM RULES