E 1 transitions from the. Upsilon. prime prime state and the fine structure of the. chi. sub b prime states

Journal Article · Mon Jun 17 04:00:00 EDT 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.3113· OSTI ID:5466409

Narain, M; Lovelock, D M.J.; Heintz, U; Lee-Franzini, J; Schamberger, R D; Willins, J; Yanagisawa, C ^[1]; Franzini, P; Tuts, P M; Kanekal, S; Wu, Q W ^[2]

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1. State University of New York at Stony Brook, Stony Brook, New York 11794 (USA)
2. Columbia University, New York, New York 10027 (USA)

Using the CUSB-II detector at the Cornell Electron Storage Ring, we have made precision measurements of the electric dipole transition rates from {Upsilon}{prime}{prime} to {chi}{sub {ital b}}{sup {prime}}, which are in excellent agreement with theory. The fine-structure splitting is found to be {ital M}({chi}{sub {ital b}2}{sup {prime}}){minus}{ital M}({chi}{sub {ital b}1}{sup {prime}})=13.5{plus minus}0.4{plus minus}0.5 MeV and {ital M}({chi}{sub {ital b}1}{sup {prime}}){minus}{ital M}({chi}{sub {ital b}0}{sup {prime}})=23.3{plus minus}0.7{plus minus}0.7 MeV, leading to a ratio {ital R}=0.584{plus minus}0.024{plus minus}0.02. The fine structure measures the relative contributions of the spin-orbit interaction {ital a}=9.5{plus minus}0.2{plus minus}0.1 MeV and tensor interaction {ital b}=2.3{plus minus}0.1{plus minus}0.1 MeV. We also find that the long-range confining potential transforms as a Lorentz scalar.

• OSTI ID: 5466409
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:24; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BOTTOMONIUM
CHI B1-10255 MESONS
COUPLING
DECAY
E1-TRANSITIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
FINE STRUCTURE
HADRONS
INTERACTIONS
INTERMEDIATE COUPLING
L-S COUPLING
LEPTON-LEPTON INTERACTIONS
MEASURING INSTRUMENTS
MESONS
MULTIPOLE TRANSITIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
QUARKONIUM
RADIATION DETECTORS
RADIATIVE DECAY
SHOWER COUNTERS
UPSILON-10355 MESONS
VECTOR MESONS