We have measured the ratio R?=BR(?????)/BR(????) by looking for the radiative decays ????? and ???? into the final states ?+??7? and 7?, respectively, in a sample of ?1.4×109? mesons produced at the Frascati ? factory. We obtain R?=(4.77±stat0.09±syst0.19)×10?3, from which we derive BR(?????)=(6.20±stat0.11±syst0.25)×10?5. Assuming the ?? has zero gluonium content, we extract the pseudoscalar mixing angle in the quark-flavor basis, ?P=(41.4±stat0.3±syst0.7±th0.6)°. Combining the value of R? with other constraints, we estimate the fractional gluonium content of the ?? to be Z2=0.14±0.04 and the mixing angle to be ?P=(39.7±0.7)°.

Measurement of the pseudoscalar mixing angle and eta ' gluonium content with the KLOE detector / Ambrosino, F., Antonelli, A., Antonelli, M., Bacci, C., Beltrame, P., Bencivenni, G., Bertolucci, S., Bini, C., Bloise, C., Bocchetta, S., Bocci, V., Bossi, F., Bowring, D., Branchini, P., Caloi, R., Campana, P., Capon, G., Capussela, T., Ceradini, F., Chi, S., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 648:4(2007), pp. 267-273. [10.1016/j.physletb.2007.03.032]

Measurement of the pseudoscalar mixing angle and eta ' gluonium content with the KLOE detector

BINI, Cesare;DE SANTIS, ANTONIO;DE ZORZI, Guido;DI DOMENICO, Antonio;FIORE, SALVATORE;FRANZINI, Paolo;GAUZZI, Paolo;LACAVA, Francesco;PATERA, Vincenzo;SCIUBBA, Adalberto;TESTA, Marianna;
2007

Abstract

We have measured the ratio R?=BR(?????)/BR(????) by looking for the radiative decays ????? and ???? into the final states ?+??7? and 7?, respectively, in a sample of ?1.4×109? mesons produced at the Frascati ? factory. We obtain R?=(4.77±stat0.09±syst0.19)×10?3, from which we derive BR(?????)=(6.20±stat0.11±syst0.25)×10?5. Assuming the ?? has zero gluonium content, we extract the pseudoscalar mixing angle in the quark-flavor basis, ?P=(41.4±stat0.3±syst0.7±th0.6)°. Combining the value of R? with other constraints, we estimate the fractional gluonium content of the ?? to be Z2=0.14±0.04 and the mixing angle to be ?P=(39.7±0.7)°.
2007
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the pseudoscalar mixing angle and eta ' gluonium content with the KLOE detector / Ambrosino, F., Antonelli, A., Antonelli, M., Bacci, C., Beltrame, P., Bencivenni, G., Bertolucci, S., Bini, C., Bloise, C., Bocchetta, S., Bocci, V., Bossi, F., Bowring, D., Branchini, P., Caloi, R., Campana, P., Capon, G., Capussela, T., Ceradini, F., Chi, S., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 648:4(2007), pp. 267-273. [10.1016/j.physletb.2007.03.032]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/231174
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