Observation of the rare η → e+e-e+e- decay with the KLOE experiment

被引：20

作者：

Ambrosino, F. ^{[4
,5
]}

Antonelli, A. ^{[1
]}

Antonelli, M. ^{[1
]}

Archilli, F. ^{[9
,10
]}

Balwierz, I. ^{[2
]}

Bencivenni, G. ^{[1
]}

Bini, C. ^{[7
,8
]}

Bloise, C. ^{[1
]}

Bocchetta, S. ^{[11
,12
]}

Bossi, F. ^{[1
]}

Branchini, P. ^{[12
]}

Capon, G. ^{[1
]}

Capussela, T. ^{[1
]}

Ceradini, F. ^{[11
,12
]}

Ciambrone, P. ^{[1
]}

Czerwinski, E. ^{[1
]}

De Lucia, E. ^{[1
]}

De Santis, A. ^{[7
,8
]}

De Simone, P. ^{[1
]}

De Zorzi, G. ^{[7
,8
]}

Denig, A. ^{[3
]}

Di Domenico, A. ^{[7
,8
]}

Di Donato, C. ^{[5
]}

Di Micco, B. ^{[11
,12
]}

Dreucci, M. ^{[1
]}

Felici, G. ^{[1
]}

Fiore, S. ^{[7
,8
]}

Franzini, P. ^{[7
,8
]}

Gatti, C. ^{[1
]}

Gauzzi, P. ^{[7
,8
]}

Giovannella, S. ^{[1
]}

Graziani, E. ^{[12
]}

Jacewicz, M. ^{[1
]}

Lee-Franzini, J. ^{[1
,13
]}

Martemianov, M. ^{[15
]}

Martini, M. ^{[1
,6
]}

Massarotti, P. ^{[4
,5
]}

Meola, S. ^{[4
,5
]}

Miscetti, S. ^{[1
]}

Morello, G. ^{[1
]}

Moulson, M. ^{[1
]}

Mueller, S. ^{[3
]}

Napolitano, M. ^{[4
,5
]}

Nguyen, F. ^{[11
,12
]}

Palutan, M. ^{[1
]}

Passeri, A. ^{[12
]}

Patera, V. ^{[1
,6
]}

Longhi, I. Prado ^{[11
,12
]}

Santangelo, P. ^{[1
]}

Sciascia, B. ^{[1
]}

机构：

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

[2] Jagiellonian Univ, Inst Phys, Krakow, Poland

[3] Johannes Gutenberg Univ Mainz, Inst Kernphys, Mainz, Germany

[4] Univ Naples Federico 2, Dipartimento Sci Fis, Naples, Italy

[5] Univ Naples Federico 2, Dipartimento Sci Fis, Naples, Italy

[6] Univ Roma La Sapienza, Dipartimento Sci Base & Applicate Ingn, Rome, Italy

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

[8] Ist Nazl Fis Nucl, Sez Roma, Rome, Italy

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

[10] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy

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

[12] Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy

[13] SUNY Stony Brook, Dept Phys, Stony Brook, NY USA

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

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

来源：

PHYSICS LETTERS B | 2011年 / 702卷 / 05期

关键词：

e(+)e(-) collisions; Rare eta decays; MONTE-CARLO; CONVERSION; MESONS; PHOTOS; PAIRS;

D O I：

10.1016/j.physletb.2011.07.033

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the first observation of the rare eta -> e(+)e(-)e(+)e(-)(gamma) decay based on 1.7 fb(-1) collected by the KLOE experiment at the DA Phi NE phi-factory. The selection of the e(+)e(-)e(+)e(-) final state is fully inclusive of radiation. We have identified 362 +/- 29 events resulting in a branching ratio of (2.4 +/- 0.2(stat+bckg) +/- 0.1(syst)) x 10(-5). (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：324 / 328

页数：5

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