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
收藏
页码：276 / 280
页数：5
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