Upper limit on the η→π+ π- branching ratio with the KLOE detector

被引：24

作者：

Ambrosino, F

Antonelli, A

Antonelli, M

Bacci, C

Barva, M

Beltrame, P

Bencivenni, G

Bertolucci, S

Bini, C ^{[1
]}

Bloise, C

Bocci, V

Bossi, F

Bowring, D

Branchini, P

Caloi, R

Campana, P

Capon, G

Capussela, T

Carboni, G

Ceradini, F

Cervelli, F

Chi, S

Chiefari, G

Ciambrone, P

Conetti, S

De Lucia, E

De Santis, A

De Simone, P

De Zorzi, G

Dell'Agnello, S

Denig, A

Di Domenico, A

Di Donato, C

Di Falco, S

Di Micco, B

Doria, A

Dreucci, M

Farilla, A

Felici, G

Ferrari, A

Ferrer, ML

Finocchiaro, G

Forti, C

Franzini, P

Gatti, C

Gauzzi, P

Giovannella, S

Gorini, E

Graziani, E

Incagli, M

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] Sezione Ist Nazl Fis Nucl, Rome, Italy

[3] Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China

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

[5] Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany

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

[7] Sezione Ist Nazl Fis Nucl, Lecce, Italy

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

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

[10] Sezione Ist Nazl Fis Nucl, Pisa, Italy

[11] Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy

[12] Sezione Ist Nazl Fis Nucl, Naples, Italy

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

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

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

[16] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

来源：

PHYSICS LETTERS B | 2005年 / 606卷 / 3-4期

关键词：

Decays of η mesons; Discrete symmetries;

D O I：

10.1016/j.physletb.2004.12.025

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have searched with the KLOE detector for the P and CP violating decay eta --> pi(+)pi(-) in a sample of 1.55 x 10(7) eta's from the decay phi --> etagamma of phi-mesons produced in e(+)e(-) annihilations at DAPhiNE. No signal is found. We obtain the upper limit BR(eta --> pi(+)pi(-)) < 1.3 x 10(-5) at 90% confidence level. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：276 / 280

页数：5

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