Published March 1, 2002 | Version v1
Journal article Metadata-only

Study of the angular distributions of the reactions p(bar sign)p→χc1, χc2→J/ψ γ→e+e-γ

Creators

  • 1. Istituto Nazionale di Fisica Nucleare and University of Ferrara, 44100 Ferrara (Italy)
  • 2. Istituto Nazionale di Fisica Nucleare and University of Torino, 10125 Torino (Italy)
  • 3. Istituto Nazionale di Fisica Nucleare and University of Genova, 16146 Genova (Italy)

Description

We report on a study of the angular distributions in the radiative decay of the χc1 and χc2 states formed in p(bar sign)p annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 χc1 and 5908 χc2 events, we have measured the fractional magnetic quadrupole amplitude to be a2(χc1)≅M2/E1=0.002±0.032, and a2(χc2)=-0.093-0.041+0.039. We have also measured the square of the helicity 0 fractional amplitude in the χc2 formation process to be B02=0.13±0.08

Additional details

Identifiers

DOI
10.1103/PhysRevD.65.052002;

Publishing Information

Journal Title
Physical Review. D, Particles Fields
Journal Volume
65
Journal Issue
5
Journal Page Range
p. 052002-052002.10
ISSN
0556-2821
CODEN
PRVDAQ

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
35043360
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
ANGULAR DISTRIBUTION; CHI1-3510 MESONS; CHI2-3555 MESONS; E1-TRANSITIONS; ELECTROMAGNETIC PARTICLE DECAY; ELECTRONS; EXPERIMENTAL DATA; HELICITY; J PSI-3097 MESONS; M2-TRANSITIONS; PHOTONS; POSITRONS; PROTON-ANTINEUTRON INTERACTIONS; QUARKONIUM; RADIATIVE DECAY
Descriptors DEC
ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; AXIAL VECTOR MESONS; BARYON-BARYON INTERACTIONS; BOSONS; CHARMONIUM; DATA; DECAY; DISTRIBUTION; ELEMENTARY PARTICLES; ENERGY-LEVEL TRANSITIONS; FERMIONS; HADRON-HADRON INTERACTIONS; HADRONS; INFORMATION; INTERACTIONS; LEPTONS; MASSLESS PARTICLES; MATTER; MESONS; MULTIPOLE TRANSITIONS; NUCLEON-ANTINUCLEON INTERACTIONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; QUARKONIUM; TENSOR MESONS; VECTOR MESONS

Optional Information

Notes
(c) 2002 The American Physical Society
Collaborations
Fermilab E835 Collaboration