Signals for the formation of the singlet [ital D] and [ital P] states of charmonium in [ital [bar p]p] collisions

Journal Article · Tue Jan 31 23:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.1172· OSTI ID:6638758

Ridener, Jr, F L ^[1]; Sebastian, K J ^[2]

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1. Pennsylvania State University at New Kensington, New Kensington, Pennsylvania 15068 (United States)
2. Department of Physics, University of Massachusetts at Lowell, 1 University Avenue, Lowell, Massachusetts 01854 (United States)

We calculate the angular distribution of the photons produced in the decays of the singlet [ital D] and singlet [ital P] states in charmonium directly produced by unpolarized proton-antiproton ([ital p[bar p]]) collisions. The reactions we study are (1) [ital p[bar p]][r arrow][sup 1][ital D][sub 2][r arrow][sup 1][ital P][sub 1]+[gamma], (2) [ital p[bar p]][r arrow][sup 1][ital D][sub 2][r arrow]1 [sup 3][ital S][sub 1]+[gamma], and (3) [ital p[bar p]][r arrow][sup 1][ital P][sub 1][r arrow][sup 1][ital S][sub 0]+[gamma]. We also study the angular distribution of the electron ([ital e][sup [minus]]) in the cascade process (4) [ital p[bar p]][r arrow][sup 1][ital P][sub 1][r arrow][psi]+[pi][sup 0][r arrow]([ital e][sup +][ital e][sup [minus]])+([gamma][sub 1][gamma][sub 2]). Simple and distinct expressions are found for each case. The observation of the photon or electron (as the case may be) with the appropriate energy and the distinct angular distribution may be taken as a signal for the formation of the singlet [ital D] and [ital P] state resonance formation in [ital p[bar p]] collisions.

• OSTI ID: 6638758
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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662390* -- Electromagnetic Processes & Properties-- (1992-)
662420 -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
BARYON-BARYON INTERACTIONS
BOSONS
CHARMONIUM
D STATES
DECAY
DISTRIBUTION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY LEVELS
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LEPTONS
MASSLESS PARTICLES
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
P STATES
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
PROTON-ANTIPROTON INTERACTIONS
QUARKONIUM