Measurement of the partial width of the decay φ → e + + e

• Published in: Physics letters. B Vol. 27; no. 2; pp. 106 - 109
• Main Authors: Binnie, D.M., Duane, A., Faruqi, A.R., Horsey, J.P., Jones, W.G., Kay, M.E., Mason, D.C., Nicholson, P.J., Rahman, I.U., Walters, J., Wilson, J.G., Palit, P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.1968
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(68)90172-X

Evidence is presented for the process π − + p→ φ + n followed by φ → e + + e −. The branching ratio (φ→ e + + e −) (φ→ total) is found to be (7.2 ± 3.9) × 10 −4, corresponding to a partial width for φ→e + + e − of 2.4 ± 1.5 keV/ c 2 and a coupling constant γ φ 2 4π of 1.9 −0.7 +2.9.