The charmonium [sup 1]P[sub 1] state (h[sub c]) produced in antiproton-proton annihilations

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1993

OSTI ID:6973514

Gollwitzer, K E

A search for the charmonium [sup 1]P[sub 1] state (h[sub c]) has been performed in [bar p]p annihilations close to the spin weighted center of gravity of the triplet P states. A statistically significant enhancement in the [bar p]p [r arrow] J/[psi][pi][degrees] cross section has been observed with characteristics consistent with the expected mass, total width, and production cross section the singlet P wave state. The resonance is centered at [radical][sub 3][approx equal]3526.15 [+-] 0.15[+-]0.19 MeV, greater than the center of gravity of the triplet P states by 0.88 [+-] 0.47 MeV. The upper limit (0% CL) for the total width is [<=]1.1 MeV. No candidates for the reactions [bar p]p [r arrow]J/[psi][pi][degrees][pi][degrees] and pp [r arrow] J/[psi][pi][sup +][pi][sup [minus]] have been observed: the upper limit (90% CL) B([sup 1]P[sub 1] [r arrow] [bar p]p) x B([sup 1]P[sub 1] [r arrow] J/[psi][pi][pi]) [<=] 3.2 x 10[sup [minus]8] is set. Searches to observe the expected dominant decay mode [sup 1]P[sub 1] [r arrow] [eta][sub c][gamma] ([eta][sub c] [r arrow] [gamma][gamma] or [eta][sub c] [r arrow] [pi][pi][eta][sub 1] [pi][pi][eta][prime] [r arrow] 6[gamma]) show no evidence of a resonance; the upper limit (90% CL) B([sup 1]P[sub 1] [r arrow] [bar p]p) x B([sup 1]P[sub 1] [r arrow] [eta][sub c][gamma]) [<=] 2.6 x 10[sup [minus]5] is set.

• Research Organization: California Univ., Irvine, CA (United States)
• OSTI ID: 6973514
• Country of Publication: United States
• Language: English

Related Subjects

662340* -- Hadron Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
CHARMONIUM
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
P STATES
PARTICLE INTERACTIONS
PROTON-ANTIPROTON INTERACTIONS
QUARKONIUM