Higher-order multipole amplitude measurement in {psi}{sup '}{yields}{gamma}{chi}{sub c2}

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.092006· OSTI ID:21607998

Ablikim, M; An, F F; An, Z H; Bai, J Z; Berger, N; Bian, J M; Cai, X; Cao, G F; Chang, J F; Chen, G; Chen, H S; Chen, J C; Chen, M L; Chen, Y; Chen, Y B; Chu, Y P; Dai, H L; Dai, J P; Deng, Z Y; Dong, L Y ^[1]

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1. Institute of High Energy Physics, Beijing 100049 (China)

Using 106x10{sup 6} {psi}{sup '} events collected with the BESIII detector at the BEPCII storage ring, the higher-order multipole amplitudes in the radiative transition {psi}{sup '}{yields}{gamma}{chi}{sub c2}{yields}{gamma}{pi}{sup +}{pi}{sup -}/{gamma}K{sup +}K{sup -} are measured. A fit to the {chi}{sub c2} production and decay angular distributions yields M2=0.046{+-}0.010{+-}0.013 and E3=0.015{+-}0.008{+-}0.018, where the first errors are statistical and the second systematic. Here M2 denotes the normalized magnetic quadrupole amplitude and E3 the normalized electric octupole amplitude. This measurement shows evidence for the existence of the M2 signal with 4.4{sigma} statistical significance and is consistent with the charm quark having no anomalous magnetic moment.

• OSTI ID: 21607998
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 9; Other Information: DOI: 10.1103/PhysRevD.84.092006; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANGULAR DISTRIBUTION
KAONS MINUS
KAONS PLUS
MAGNETIC MOMENTS
OCTUPOLES
PARTICLE DECAY
QUARKS
STORAGE RINGS
BOSONS
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
KAONS
MESONS
MULTIPOLES
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES