Search for a new gauge boson in π0 decays

被引：34

作者：

Altegoer, J ^{[1
]}

Astier, P

Autiero, D

Baldisseri, A

Baldo-Ceolin, M

Ballocchi, G

Banner, M

Basa, S

Bassompierre, G

Benslama, K

Besson, N

Bird, I

Blumenfeld, B

Bobisut, F

Bouchez, J

Boyd, S

Bueno, A

Bunyatov, S

Camilleri, L

Cardini, A

Castera, A

Cattaneo, PW

Cavasinni, V

Cervera-Villanueva, A

Collazuol, GM

Conforto, G

Conta, C

Contalbrigo, M

Cousins, R

Daniels, D

De Santo, A

Del Prete, T

Dignan, T

Di Lella, L

Silva, EDE

Donnelly, IJ

Dumarchez, J

Fazio, T

Feldman, GJ

Ferrari, R

Ferrere, D

Flaminio, V

Fraternali, M

Gaillard, JM

Galumian, P

Gangler, E

Geiser, A

Geppert, D

Gibin, D

Gninenko, SN

机构：

[1] Univ Dortmund, Dortmund, Germany

[2] Univ Massachusetts, Amherst, MA 01003 USA

[3] LAPP, Annecy, France

[4] Johns Hopkins Univ, Baltimore, MD USA

[5] Harvard Univ, Cambridge, MA 02138 USA

[6] INFN, Cosenza, Italy

[7] Univ Calabria, I-87036 Cosenza, Italy

[8] JINR Dubna, Dubna, Russia

[9] Univ Florence, Florence, Italy

[10] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[11] CERN, Geneva, Switzerland

[12] Univ Lausanne, Lausanne, Switzerland

[13] Univ Calif Los Angeles, Los Angeles, CA USA

[14] Univ Melbourne, Melbourne, Vic, Australia

[15] Nucl Res Inst, Moscow, Russia

[16] Univ Padua, Padova, Italy

[17] Ist Nazl Fis Nucl, Padova, Italy

[18] Univ Paris, LPNHE, F-75252 Paris, France

[19] Univ Paris 07, LPNHE, Paris, France

[20] Univ Paris 06, LPNHE, Paris, France

[21] Univ Pavia, I-27100 Pavia, Italy

[22] Ist Nazl Fis Nucl, I-27100 Pavia, Italy

[23] Univ Pisa, Pisa, Italy

[24] Ist Nazl Fis Nucl, Pisa, Italy

[25] Univ Roma 3, Roma, Italy

[26] Univ Sydney, Sydney, NSW 2006, Australia

[27] ANSTO Sydney, Menai, NSW, Australia

[28] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[29] Univ Urbino, I-61029 Urbino, Italy

[30] Rudjer Boskovic Inst, Zagreb, Croatia

来源：

PHYSICS LETTERS B | 1998年 / 428卷 / 1-2期

基金：

美国国家科学基金会; 澳大利亚研究理事会;

关键词：

D O I：

10.1016/S0370-2693(98)00402-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search was made for a new light gauge boson X which might be produced in pi(0) -->, gamma + X decay from neutral pions generated by 450 GeV protons in the CERN SPS neutrino target. The X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of X --> pi(0) conversion in the external Coulomb field of a nucleus. With 1.45 x 10(18) protons on target, 20 candidate events with energy between 8 and 140 GeV were found from the analysis of neutrino data. This number is in agreement with the expectation of 18.1 +/- 2.8 background events from standard neutrino processes. A new 90% C.L. upper limit on the branching ratio Br(pi(0) --> Y + X)< (3.3 to 1.9)X 10(-5) for X masses ranging from 0 to 120 MeV/c(2) is obtained. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：197 / 205

页数：9

共 24 条

[21] GRAND UNIFIED THEORIES AND PROTON DECAY [J].