Using the Crystal Ball detector at the e+e-storage ring DORIS II, we have measured the branching fraction to muon pairs B(mu-mu) of the UPSILON(1S) and UPSILON(2S) resonances and for the first time the product of the muonic partial width GAMMA(mu-mu) and the branching fraction to electrons B(ee) for both resonances. We obtain B(mu-mu) (1S) = (2.31 +/- 0.12 +/- 0.10)%, GAMMA(mu-mu) (1S) . B(ee) (1S) = (31.2 +/- 1.6 +/- 1.7) eV, and B(mu-mu) (2S) = (1.22 +/- 0.28 +/- 0.19)%, GAMMA(mu-mu) (2S) . B(ee) (2S) = (6.5 +/- 1.5 +/- 1.0) eV. Inserting the present world average value of B(ee) (1S) = (2.52 +/- 0.17)%, we determine the muonic partial width of the UPSILON(1S) as GAMMA(mu-mu) (1S) = (1.24 +/- 0.06 +/- 0.11) keV. In addition, we present the first indication of the expected interference between mu-pair production in the continuum and in UPSILON(1S) decays.
Measurement of the Decay of the Y(1S) and Y(2S) Resonances To Muon Pairs / M., Kobel; D., Antreasyan; H. W., Bartels; D., Besset; C., Bieler; J. K., Bienlein; Bizzeti, Andrea; E. D., Bloom; I., Brock; K., Brockmuller; R., Cabenda; A., Cartacci; M., Cavallisforza; R., Clare; A., Compagnucci; G., Conforto; S., Cooper; R., Cowan; D., Coyne; A., Engler; K., Fairfield; G., Folger; A., Fridman; J., Gaiser; D., Gelphman; G., Glaser; G., Godfrey; K., Graaf; F. H., Heimlich; F. H., Heinsius; R., Hofstadter; J., Irion; Z., Jakubowski; H., Janssen; K., Karch; S., Keh; T., Kiel; H., Kilian; I., Kirkbride; T., Kloiber; W., Koch; A. C., Konig; K., Konigsmann; R. W., Kraemer; S., Kruger; G., Landi; R., Lee; S., Leffler; R., Lekebusch; T., Lesiak; A. M., Litke; W., Lockman; S., Lowe; B., Lurz; D., Marlow; H., Marsiske; W., Maschmann; P., Mcbride; F., Messing; W. J., Metzger; H., Meyer; B., Monteleoni; B., Muryn; R., Nernst; B., Niczyporuk; G., Nowak; C., Peck; P. G., Pelfer; B., Pollock; F. C., Porter; D., Prindle; P., Ratoff; M., Reidenbach; B., Renger; C., Rippich; M., Scheer; P., Schmitt; J., Schotanus; J., Schutte; A., Schwarz; D., Sievers; T., Skwarnicki; V., Stock; K., Strauch; U., Strohbusch; J., Tompkins; H. J., Trost; B., Vanuitert; R. T., Vandewalle; H., Vogel; A., Voigt; U., Volland; K., Wachs; K., Wacker; W., Walk; H., Wegener; D. A., Williams; P., Zschorsch. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - STAMPA. - 53:(1992), pp. 193-205. [10.1007/BF01597555]
Measurement of the Decay of the Y(1S) and Y(2S) Resonances To Muon Pairs
BIZZETI, Andrea;
1992
Abstract
Using the Crystal Ball detector at the e+e-storage ring DORIS II, we have measured the branching fraction to muon pairs B(mu-mu) of the UPSILON(1S) and UPSILON(2S) resonances and for the first time the product of the muonic partial width GAMMA(mu-mu) and the branching fraction to electrons B(ee) for both resonances. We obtain B(mu-mu) (1S) = (2.31 +/- 0.12 +/- 0.10)%, GAMMA(mu-mu) (1S) . B(ee) (1S) = (31.2 +/- 1.6 +/- 1.7) eV, and B(mu-mu) (2S) = (1.22 +/- 0.28 +/- 0.19)%, GAMMA(mu-mu) (2S) . B(ee) (2S) = (6.5 +/- 1.5 +/- 1.0) eV. Inserting the present world average value of B(ee) (1S) = (2.52 +/- 0.17)%, we determine the muonic partial width of the UPSILON(1S) as GAMMA(mu-mu) (1S) = (1.24 +/- 0.06 +/- 0.11) keV. In addition, we present the first indication of the expected interference between mu-pair production in the continuum and in UPSILON(1S) decays.Pubblicazioni consigliate
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