Measurement of Γ(φ→η′γ)/Γ(φ→ηγ) and the pseudoscalar mixing angle

被引：58

作者：

Aloisio, A

Ambrosino, F ^{[1
]}

Antonelli, A

Antonelli, M

Bacci, C

Bencivenni, G

Bertolucci, S

Bini, C

Bloise, C

Bocci, V

Bossi, F

Branchini, P

Bulychjov, SA

Cabibbo, G

Caloi, R

Campana, P

Capon, G

Carboni, G

Casarsa, M

Casavola, V

Cataldi, G

Ceradini, F

Cervelli, F

Cevenini, F

Chiefari, G

Ciambrone, P

Conetti, S

De Lucia, E

De Robertis, G

De Simone, P

De Zorzi, G

Dell'Agnello, S

Denig, A

Di Domenico, A

Di Donato, C

Di Falco, S

Doria, A

Dreucci, M

Erriquez, O

Farilla, A

Felici, G

Ferrari, A

Ferrer, ML

Finocchiaro, G

Forti, C

Franceschi, A

Franzini, P

Gatti, C

Gauzzi, P

Giovannella, S

机构：

[1] Univ Naples Federico II, Dipartimento Sci Fis, Naples, Italy

[2] Ist Nazl Fis Nucl, I-80125 Naples, Italy

[3] Univ Bari, Dipartimento Fis, Bari, Italy

[4] Ist Nazl Fis Nucl, I-70126 Bari, Italy

[5] Univ Virginia, Dept Phys, Charlottesville, VA 22903 USA

[6] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[7] Univ Karlsruhe, Inst Expt Kernphys, Karlsruhe, Germany

[8] Univ Lecce, Dipartimento Fis, I-73100 Lecce, Italy

[9] Ist Nazl Fis Nucl, I-73100 Lecce, Italy

[10] Univ Roma La Sapienza, Dipartimento Energet, Rome, Italy

[11] Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy

[12] Univ Roma Tre, Dipartimento Fis, Rome, Italy

[13] Univ Pisa, Dipartimento Fis, Pisa, Italy

[14] Ist Nazl Fis Nucl, Pisa, Italy

[15] SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA

[16] Univ Trieste, Dipartimento Fis, Trieste, Italy

[17] Ist Nazl Fis Nucl, Trieste, Italy

[18] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[19] Inst Theoret & Expt Phys, Moscow 117259, Russia

来源：

PHYSICS LETTERS B | 2002年 / 541卷 / 1-2期

关键词：

e(+)e(-) collisions; phi radiative decays; pseudoscalar mixing angle;

D O I：

10.1016/S0370-2693(02)02145-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have measured the radiative decays phi --> etagamma, phi --> eta'gamma selecting pi(+)pi(-)gammagammagamma final state in a sample of similar to 5 x 10(7) phi-mesons produced at the Frascati phi-factory DAPhiNE. We obtain Gamma(phi --> eta'gamma)/Gamma(phi --> etagamma) = (4.70 +/- 0.47 +/- 0.31) x 10(-3). From this result we derive new accurate values for the branching ratio BR(phi --> eta'gamma) = (6.10 +/- 0.61 +/- 0.43) x 10(-5) and the mixing angle of pseudoscalar mesons in the flavour basis phi(P) = (41.8(-1.6)(+1.9))degrees. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：45 / 51

页数：7

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