Study of the doubly radiative decay J /. psi. r arrow. gamma. gamma. rho. sup 0

Journal Article · Thu Mar 01 00:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.41.1410· OSTI ID:6850739

Coffman, D; DeJongh, F; Dubois, G; Eigen, G; Hauser, J; Hitlin, D G; Matthews, C G; Mincer, A; Richman, J D; Wisniewski, W J; Zhu, Y ^[1]; Burchell, M; Dorfan, D E; Drinkard, J; Gatto, C; Hamilton, R P; Heusch, C A; Koepke, L; Lockman, W S; Partridge, R ; Sadrozinski, H F.W.; Scarlatella, M; Schalk, T L; Seiden, A; Weinstein, A J; Weseler, S; Xu, R ^[2]; Becker, J J; Blaylock, G T; Eisenstein, B I; Freese, T; Gladding, G; Izen, J M; Plaetzer, S A; Simopoulos, C; Spadafora, A L; Stockdale, I E; Tripsas, B ^[3]; Mallik, U; Roco, M; Wang, M Z ^[4]; Adler, J; Bolton, T; Brient, J C; Bunnell, K O; Cassell, R E; Coward, D H; Einsweiler, K F; Grab, C; Kim, P C; Labs, J; Odian, A; Pitman, D

---

1. California Institute of Technology, Pasadena, California 91125 (USA)
2. University of California at Santa Cruz, Santa Cruz, California 95064 (USA)
3. University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (USA)
4. University of Iowa, Iowa City, Iowa 52242 (USA)

We present a study of the decay sequence {ital J}/{psi}{r arrow}{gamma}{ital X}, {ital X}{r arrow}{gamma}{rho}{sup 0}, {rho}{sup 0}{r arrow}{pi}{sup +}{pi}{sup {minus}}, based on 5.8{times}10{sup 6} produced {ital J}/{psi} collected by the Mark III detector at the SLAC storage ring SPEAR. In the {gamma}{rho}{sup 0} mass spectrum, we find two peaks with masses and widths consistent with the axial-vector mesons {ital f}{sub 1}(1285) and {ital f}{sub 1}(1420) that have recently been observed in two-photon collisions. Fits to the angular distributions confirm that the first peak is an axial-vector state, but are unable to distinguish between the {ital f}{sub 1}(1420) or the pseudoscalar {eta}(1430) for the high-mass peak. Product branching fractions for both objects are presented.

• DOE Contract Number: AC03-76SF00515; AC02-76ER01195; AC03-81ER40050; AM04-79CH10012
• OSTI ID: 6850739
• Journal Information: Physical Review, D (Particles Fields); (USA), Vol. 41:5; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
F1-1285 MESONS
PARTICLE PRODUCTION
F1-1420 MESONS
J PSI-3097 MESONS
RADIATIVE DECAY
ANGULAR DISTRIBUTION
BRANCHING RATIO
ETA-1440 MESONS
MASS SPECTRA
PHOTONS
PIONS MINUS
PIONS PLUS
RHO-770 MESONS
SPEAR
AXIAL VECTOR MESONS
BOSONS
CHARMONIUM
DISTRIBUTION
ELEMENTARY PARTICLES
HADRONS
MASSLESS PARTICLES
MESONS
PIONS
PSEUDOSCALAR MESONS
QUARKONIUM
SPECTRA
STORAGE RINGS
VECTOR MESONS
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties