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
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
收藏
页码:324 / 328
页数:5
相关论文
共 50 条
  • [1] Observation of the double Dalitz decay η' → e+e-e+e-
    Ablikim, M.
    Achasov, M. N.
    Adlarson, P.
    Ahmed, S.
    Albrecht, M.
    Amoroso, A.
    An, Q.
    Bai, X. H.
    Bai, Y.
    Bakina, O.
    Ferroli, R. Baldini
    Balossino, I
    Ban, Y.
    Begzsuren, K.
    Bennett, J., V
    Berger, N.
    Bertani, M.
    Bettoni, D.
    Bianchi, F.
    Biernat, J.
    Bloms, J.
    Bortone, A.
    Boyko, I
    Briere, R. A.
    Cai, H.
    Cai, X.
    Calcaterra, A.
    Cao, G. F.
    Cao, N.
    Cetin, S. A.
    Chang, J. F.
    Chang, W. L.
    Chelkov, G.
    Chen, D. Y.
    Chen, G.
    Chen, H. S.
    Chen, M. L.
    Chen, S. J.
    Chen, X. R.
    Chen, Y. B.
    Cheng, W.
    Cibinetto, G.
    Cossio, F.
    Cui, X. F.
    Dai, H. L.
    Dai, J. P.
    Dai, X. C.
    Dbeyssi, A.
    de Boer, R. B.
    Dedovich, D.
    PHYSICAL REVIEW D, 2022, 105 (11)
  • [2] Measurements of the rare decay KL → e+e-e+e-
    Alavi-Harati, A
    Alexopoulos, T
    Arenton, M
    Arisaka, K
    Averitte, S
    Barker, AR
    Bellantoni, L
    Bellavance, A
    Belz, J
    Ben-David, R
    Bergman, DR
    Blucher, E
    Bock, GJ
    Bown, C
    Bright, S
    Cheu, E
    Childress, S
    Coleman, R
    Corcoran, MD
    Corti, G
    Cox, B
    Crisler, MB
    Erwin, AR
    Ford, R
    Glazov, A
    Golossanov, A
    Graham, G
    Graham, J
    Hagan, K
    Halkiadakis, E
    Hamm, J
    Hanagaki, K
    Hidaka, S
    Hsiung, YB
    Jejer, V
    Jensen, DA
    Kessler, R
    Kobrak, HGE
    LaDue, J
    Lath, A
    Ledovskoy, A
    McBride, PL
    Mikelsons, P
    Monnier, E
    Nakaya, T
    Nelson, KS
    Nguyen, H
    O'Dell, V
    Pang, M
    Pordes, R
    PHYSICAL REVIEW LETTERS, 2001, 86 (24) : 5425 - 5429
  • [3] OBSERVATION OF THE DECAY K0L-]E+E-E+E-
    BARR, GD
    CAROSI, R
    COWARD, D
    CUNDY, D
    DOBLE, N
    GATIGNON, L
    GIBSON, V
    GRAFSTROM, P
    HAGELBERG, R
    VANDERLANS, J
    NELSON, HN
    WAHL, H
    CANDLIN, DJ
    PEACH, KJ
    BLUMER, H
    HEINZ, R
    KLEINKNECHT, K
    MAYER, P
    PANZER, B
    RENK, B
    ROHRER, H
    WAGNER, A
    AUGE, E
    FOURNIER, D
    HEUSSE, P
    ICONOMIDOUFAYARD, L
    HARRUS, I
    PERDEREAU, O
    SCHAFFER, AC
    SERIN, L
    BERTANZA, L
    BIGI, A
    CALAFIURA, P
    CALVETTI, M
    CASALI, R
    CERRI, C
    FANTECHI, R
    MANNELLI, I
    NAPPI, A
    PIERAZZINI, GM
    HOLDER, M
    KREUTZ, A
    QUAST, G
    ROST, M
    SANDER, HG
    WERTHENBACH, R
    ZECH, G
    PHYSICS LETTERS B, 1991, 259 (03) : 389 - 392
  • [4] Measurement of the KL → e+e-e+e- decay rate
    Lai, A
    Marras, D
    Bevan, A
    Dosanjh, RS
    Gershon, TJ
    Hay, B
    Kalmus, GE
    Lazzeroni, C
    Munday, DJ
    Needham, MD
    Olaiya, E
    Parker, MA
    White, TO
    Wotton, SA
    Barr, G
    Bocquet, G
    Ceccucci, A
    Cuhadar, T
    Cundy, D
    D'Agostini, G
    Doble, N
    Falaleev, V
    Gatignon, L
    Gonidec, A
    Gorini, B
    Govi, G
    Grafström, P
    Kubischta, W
    Lacourt, A
    Norton, A
    Palestini, S
    Panzer-Steindel, B
    Tatishvili, G
    Taureg, H
    Velasco, M
    Wahl, H
    Cheshkov, C
    Hristov, P
    Kekelidze, V
    Madigojine, D
    Molokanova, N
    Potrebenikov, Y
    Zinchenko, A
    Knowles, I
    Martin, V
    Sacco, R
    Walker, A
    Contalbrigo, M
    Dalpiaz, P
    Duclos, J
    PHYSICS LETTERS B, 2005, 615 (1-2) : 31 - 38
  • [5] Study of the decay η → e+e-e+e- with WASA-at-COSY
    Yurev, Leonid
    MESON PHYSICS AT COSY - 11 AND WASA-AT- COSY, 2007, 950 : 232 - 235
  • [6] Study of the η → π+π-e+e- decay at KLOE
    Versaci, Roberto
    DISCRETE 08: SYMPOSIUM ON PROSPECTS IN THE PHYSICS OF DISCRETE SYMMETRIES, 2009, 171
  • [7] Observation of the rare decay KS → π0e+e-
    Batley, JR
    Kalmus, GE
    Lazzeroni, C
    Munday, DJ
    Patel, M
    Slater, MW
    Wotton, SA
    Arcidiacono, R
    Bocquet, G
    Ceccucci, A
    Cundy, D
    Doble, N
    Falaleev, V
    Gatignon, L
    Gonidec, A
    Grafström, P
    Kubischta, W
    Marchetto, F
    Mikulec, I
    Norton, A
    Panzer-Steindel, B
    Rubin, P
    Wahl, H
    Goudzovski, E
    Gurev, D
    Hristov, P
    Kekelidze, V
    Litov, L
    Madigozhin, D
    Molokanova, N
    Potrebenikov, Y
    Stoynev, S
    Zinchenko, A
    Monnier, E
    Swallow, E
    Winston, R
    Sacco, R
    Walker, A
    Baldini, W
    Dalpiaz, P
    Frabetti, PL
    Gianoli, A
    Martini, M
    Petrucci, F
    Scarpa, M
    Savrié, M
    Bizzeti, A
    Calvetti, M
    Collazuol, G
    Graziani, G
    PHYSICS LETTERS B, 2003, 576 (1-2) : 43 - 54
  • [8] MEASUREMENT OF THE BRANCHING RATIO AND A STUDY OF CP FOR THE LEPTONIC DECAY KAPPA(L)-]E+E-E+E-
    GU, P
    HAAS, P
    HOGAN, WP
    KIM, SK
    MATTHES, JN
    MYUNG, SS
    SCHNETZER, S
    THOMSON, GB
    ZOU, Y
    ARISAKA, K
    ROBERTS, D
    SLATER, W
    WEAVER, M
    BRIERE, RA
    CHEU, E
    HARRIS, DA
    MCFARLAND, KS
    ROODMAN, A
    SCHWINGENHEUER, B
    SOMALWAR, SV
    WAH, YW
    WINSTEIN, B
    WINSTON, R
    BARKER, AR
    SWALLOW, EC
    BOCK, GJ
    COLEMAN, R
    CRISLER, M
    ENAGONIO, J
    FORD, R
    HSIUNG, YB
    JENSEN, DA
    RAMBERG, E
    TSCHIRHART, R
    COLLINS, EM
    GOLLIN, GD
    NAKAYA, T
    YAMANAKA, T
    PHYSICAL REVIEW LETTERS, 1994, 72 (19) : 3000 - 3003
  • [9] THE CROSS-SECTION FOR E+E--]E+E-E+E-
    KLEISS, R
    NUCLEAR PHYSICS B, 1984, 241 (01) : 61 - 74
  • [10] Search for the KS → e+e- decay with the KLOE detector
    Ambrosino, F.
    Antonelli, A.
    Antonelli, M.
    Archilli, F.
    Beltrame, R.
    Bencivenni, G.
    Bertolucci, S.
    Bini, C.
    Bloise, C.
    Bocchetta, S.
    Bossi, F.
    Branchini, P.
    Campana, P.
    Capon, G.
    Capriotti, D.
    Capussela, T.
    Ceradini, F.
    Ciambrone, P.
    Crucianelli, F.
    De Lucia, E.
    De Santis, A.
    De Simone, P.
    De Zorzi, G.
    Denig, A.
    Di Domenico, A.
    Di Donato, C.
    Di Micco, B.
    Dreucci, M.
    Felici, G.
    Ferrer, M. L.
    Fiore, S.
    Franzini, P.
    Gatti, C.
    Gauzzi, P.
    Giovannella, S.
    Graziani, E.
    Kluge, W.
    Kulikov, V.
    Lanfranchi, G.
    Lee-Franzini, J.
    Leone, D.
    Martini, M.
    Massarotti, P.
    Meola, S.
    Miscetti, S.
    Moulson, M.
    Mueller, S.
    Murtas, F.
    Napolitano, M.
    Nguyen, F.
    PHYSICS LETTERS B, 2009, 672 (03) : 203 - 208