Upper limit on the η → π+π- branching fraction with the KLOE experiment

被引：2

作者：

Babusci, D. ^{[4
]}

Berlowski, M. ^{[22
]}

Bloise, C. ^{[4
]}

Bossi, F. ^{[4
]}

Branchini, P. ^{[19
]}

Budano, A. ^{[18
,19
]}

Cao, B. ^{[21
]}

Ceradini, F. ^{[19
]}

Ciambrone, P. ^{[4
]}

Curciarello, F. ^{[1
]}

Czerwinski, E. ^{[3
]}

D'Agostini, G. ^{[14
,15
]}

Dane, E. ^{[4
]}

De Leo, V. ^{[14
,15
]}

De Lucia, E. ^{[4
]}

De Santis, A. ^{[4
]}

De Simone, P. ^{[4
]}

Di Cicco, A. ^{[18
,19
]}

Di Domenico, A. ^{[14
,15
]}

Domenici, D. ^{[4
]}

D'Uffizi, A. ^{[4
]}

Fantini, A. ^{[16
,17
]}

Fermani, P. ^{[4
]}

Fiore, S. ^{[15
,20
]}

Gajos, A. ^{[3
]}

Gauzzi, P. ^{[14
,15
]}

Giovannella, S. ^{[4
]}

Graziani, E. ^{[19
]}

Ivanov, V. L. ^{[7
,8
]}

Johansson, T. ^{[21
]}

Kang, X. ^{[4
,23
]}

Kisielewska-Kaminska, D. ^{[3
]}

Kozyrev, E. A. ^{[7
,8
]}

Krzemien, W. ^{[22
]}

Kupsc, A. ^{[21
]}

Lukin, P. A. ^{[7
,8
]}

Mandaglio, G. ^{[2
,6
]}

Martini, M. ^{[4
,13
]}

Messi, R. ^{[16
,17
]}

Miscetti, S. ^{[4
]}

Moricciani, D. ^{[4
]}

Moskal, P. ^{[3
]}

Parzych, S. ^{[3
]}

Passeri, A. ^{[19
]}

Patera, V. ^{[12
,15
]}

del Rio, E. Perez ^{[14
,15
]}

Santangelo, P. ^{[4
]}

Schioppa, M. ^{[10
,11
]}

Selce, A. ^{[18
,19
]}

Silarski, M. ^{[3
]}

机构：

[1] Univ Catania, Dipartimento Fis & Astron Ettore Majorana, Catania, Italy

[2] INFN, Sez Catania, Catania, Italy

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

[4] INFN, Lab Nazl Frascati, Frascati, Italy

[5] Horia Hulubei Natl Inst Phys & Nucl Engn, Magurele, Romania

[6] Univ Messina, Dipartimento Sci Matemat & Informat, Sci Fis & Sci Terra, Messina, Italy

[7] Budker Inst Nucl Phys, Novosibirsk, Russia

[8] Novosibirsk State Univ, Novosibirsk, Russia

[9] INFN, Sez Pisa, Pisa, Italy

[10] Univ Calabria, Dipartimento Fis, Arcavacata Di Rende, Italy

[11] INFN, Grp Collegato Cosenza, Arcavacata Di Rende, Italy

[12] Univ Sapienza, Dipartimento Sci Base & Applicate Ingn, Rome, Italy

[13] Univ Guglielmo Marconi, Dipartimento Sci & Tecnol Applicate, Rome, Italy

[14] Univ Sapienza, Dipartimento Fis, Rome, Italy

[15] INFN, Sez Roma, Rome, Italy

[16] Univ Tor Vergata, Dipartimento Fis, Rome, Italy

[17] INFN, Sez Roma Tor Vergata, Rome, Italy

[18] Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy

[19] INFN, Sez Roma Tre, Rome, Italy

[20] ENEA, Dept Fus & Technol Nucl Safety & Secur, Frascati, RM, Italy

[21] Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden

[22] Natl Ctr Nucl Res, Warsaw, Poland

[23] China Univ Geosci Wuhan, Sch Math & Phys, Wuhan, Peoples R China

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 2020卷 / 10期

关键词：

Branching fraction; CP violation; e(+)-e(-) Experiments; Rare decay; CP; SEARCHES; DETECTOR; DECAYS;

D O I：

10.1007/JHEP10(2020)047

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Based on an integrated luminosity of 1.61 fb(-1)e(+)e(-) collision data collected with the KLOE detector at DA Phi NE, the Frascati phi -factory, a search for the P- and CP-violating decay eta -> pi (+)pi (-) has been performed. Radiative phi -> eta gamma decay is exploited to access the eta mesons. No signal is observed in the pi (+)pi (-) invariant mass spectrum, and the upper limit on the branching fraction at 90% confidence level is determined to be B(eta -> pi (+)pi (-)) < 4.9 x 10(-6), which is approximately three times smaller than the previous KLOE result. From the combination of these two measurements we get B(<eta> -> pi (+)pi (-)) < 4.4 x 10(-6) at 90% confidence level.

引用

页数：11

共 50 条

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